Download LAHK-1 Service Manual

MANUFACTURED FOR:
MITSUBISHI ELECTRIC US, INC.
TECHNICAL & SERVICE MANUAL
Model
2015
2015
LAHK-1 Low Ambient Hood
TECHNICAL
& SERVICE MANUAL
for use with:
CITY MULTI® PUHY-P-T/Y(S)K/LMU, PURY-P-T/Y(S)K/LMU,
andLAHK-1
PURY-HP-T/Y(S)KMU
Series Hood
Model
Low Ambient
Outdoor Units
4000292
4000292
Contents
1. Control Box Component Identification.....................................2
2. Operating Sequence...............................................................3
3. Damper Blade Adjustment.......................................................5
4. Damper Actuator Manual Override..........................................8
5. Parts List.................................................................................9
6. Wiring Diagram......................................................................10
1.LAHK-1
Control Control
Box Component
Identification
Box Component
Identification
Operating Sequence
Outdoor Unit in Cooling Mode
The LAHK-1 low ambient hood is designed to reduce
the airflow through the outdoor units as the ambient
temperature drops. This maintains the head pressure
at a level that will allow the system to perform at 100%
o
capacity down to -10 F outdoor temperature.
A thermistor mounted on the side of the unit senses
the outdoor temperature. As the outdoor temperature
drops, the resistance of the thermistor increases. The
thermistor is connected to the specially designed circuit
board and the resistance value from the thermistor is
converted to a DC voltage output within the circuit
board. This DC voltage output drives the damper
actuator to a predetermined position based on the
outdoor temperature.
The inverter driven fan motor will adjust the discharge
pressure based on system capacity demand. The
motor will speed up and force more air through the
damper if there is a higher system capacity demand, or
slow down if system capacity demand decreases.
Specifications are subject to change without notice.
Outdoor Unit in Heating Mode
Heating mode requires the damper be in the fully open
position to allow full airflow and maximum heating
capacity.
Heating mode automatically deactivates the kit through
an interlock relay. The coil for this relay is tied into the
reversing valve connection on the outdoor unit. When
the unit switches to heating mode, the reversing valve
is energized. This in-turn energizes the interlock relay.
When the relay is energized, the normally closed
contact opens. By opening this contact, the power to
the transformer and control board is interrupted, this
allows the damper to spring to the full open position.
Outdoor Unit in Defrost Mode
If the outdoor unit will be running in heating mode, a
defrost period is inevitable. During defrost the low
ambient controls see this as the unit operating in
cooling mode. If the outdoor temperature is below 50 F,
the damper will close to a position equal to that
required during the cooling cycle. Once the unit comes
back out of defrost and into heating mode, the damper
will again spring wide open for full airflow.
Operation Test
© 2015 Mitsubishi Electric US, Inc.
Outdoor unit must be in cooling mode
2
2. Operating Sequence
Outdoor Unit in Cooling Mode
The LAHK-1 low ambient hood is designed to reduce the airflow
through the outdoor units as the ambient temperature drops. This
maintains the head pressure at a level that will allow the system to
perform at 100% capacity down to -10oF outdoor temperature.
A thermistor mounted on the side of the unit senses the outdoor
temperature. As the outdoor temperature drops, the resistance of the
thermistor increases. The thermistor is connected to the specially
designed circuit board and the resistance value from the thermistor
is converted to a DC voltage output within the circuit board. This
DC voltage output drives the damper actuator to a predetermined
position based on the outdoor temperature.
The inverter driven fan motor will adjust the discharge pressure
based on system capacity demand. The motor will speed up and
force more air through the damper if there is a higher system
hoods and
damper
controls
are iftested
the factory
capacity
demand,
or slow down
system at
capacity
demand
decreases.
ore shipping.
To perform an operational test once
installation has been completed, follow the steps
Outdoor Unit in Heating Mode
ow.
Heating mode requires the damper be in the fully open position to
allow full airflow and maximum heating capacity.
mode
automatically
deactivates
the kit through
erationHeating
testing
when
the outdoor
ambient
is an interlock
relay. The coil for this relay is tied into the reversing valve connection
OVE 50°F
on the outdoor unit. When the unit switches to heating mode, the
reversing valve is energized. This in-turn energizes the interlock
relay.
the relay
is energized,
normally closed contact
1. Turn
onWhen
power
to the
outdoorthe
unit.
opens.
By opening
this contact,
to the transformer
2. Make
sure
the outdoor
unitthe
is power
in cooling
mode. and
control board is interrupted, this allows the damper to spring to the
3. Locate
the
outdoor temperature sensing
full open
position.
thermistor at the end of the short conduit
Outdoor
Unit
in Defrost
coming
out
the
side ofMode
the control panel, it can
the outdoor unit will be running in heating mode, a defrost period
beIfisseen
inside
the
plastic
shield.
inevitable. During defrost the low ambient controls see this as the
dusting
sprayer,
invert
the is below
4. Using
an
aerosol
unit operating in cooling mode. If the outdoor
temperature
can
thermistor
withequal
veryto short
50and
F, thespray
damperthe
will close
to a position
that required during
the cooling
cycle.
Once
the unit
comes backDo
outNot
of defrost and into
bursts
of the
cold
liquid.
Caution!
heating mode, the damper will again spring wide open for full airflow.
overspray
the thermistor as it could be
damaged.
It
may take 10 – 20 seconds for
Operation Test
Outdoor
unit
must be in cooling
mode
the internal thermistor
temperature
to drop.
All
hoods
and
damper
controls
are
at thethe
factory before
The damper will start to movetested
toward
shipping. To perform an operational test once the installation has
closed
position follow
after the
thesteps
thermistor
drops
been completed,
below.
below 50°F
Operation
testing when
the outdoor
ambient
is ABOVE
5. Once
the thermistor
warms
above
50°F,
it will 50° F
move
back to the full open position indicating
1. Turn on power to the outdoor unit.
the2.lowMake
ambient
is working
designed.
sure thekit
outdoor
unit is in as
cooling
mode.
3.
Locate the outdoor temperature sensing thermistor at the end of
the short conduit coming out the side of the control panel, it can
eration testing
when the outdoor ambient is
be seen inside the plastic shield.
LOW 50°F
4. Using an aerosol dusting sprayer, invert the can and spray the
thermistor with very short bursts of the cold liquid.
Caution! Do Not overspray the thermistor as it could be
1. Turn on
powerIttomay
thetake
outdoor
damaged.
10 – 20 unit.
seconds for the internal
2. Make thermistor
sure the outdoor
unit
is in cooling mode.
temperature
to drop.
The damper
start to
move toward
the closed position after
3. The damper
willwill
move
toward
the closed
the thermistor drops below 50°F
position to a predetermined position based on
5. Once the thermistor warms above 50°F, it will move back to the
the outdoor
temperature,
indicating
full openambient
position indicating
the low ambient
kit is working as
the lowdesigned.
ambient kit is working as designed.
testing when the outdoor ambient is BELOW 50° F
either ofOperation
these tests
work. Proceed with the
mponent1.troubleshooting
instructions.
Turn on power to the
outdoor unit.
2.
3.
Make sure the outdoor unit is in cooling mode.
The damper will move toward the closed position to a
mponentpredetermined
Troubleshooting
position based on the outdoor ambient
temperature,
indicating the low ambient kit is working as
ermistor
e thermistordesigned.
is a 10,000 Ω, NTC Type.
e circuit ©board
has aElectric
blinking
2015 Mitsubishi
US, Inc.indicator light built in to
erence what the thermistor is sensing. The chart
ow shows what the blinking light sequence means.
position to a predetermined position based on
the outdoor ambient temperature, indicating
the low ambient kit is working as designed.
If neither of these tests work. Proceed with the
troubleshooting
instructions.
Ifcomponent
neither of these
tests work. Proceed
with the component
troubleshooting instructions.
Component Troubleshooting
Component Troubleshooting
Thermistor
Thermistor
Thethermistor
thermistor
a 10,000
Ω,Type.
NTC Type.
The
is a is
10,000
Ω, NTC
Thecircuit
circuit
board
has
a blinking
indicator
built in to
The
board
has a
blinking
indicator
light built light
in to reference
what
the thermistor
is sensing.
The chart
below shows
the
reference
what the
thermistor
is sensing.
Thewhat
chart
blinking
light
sequence
means.
below shows what the blinking light sequence means.
Blink(s)
1
2
3
chart, the
thermistor
Constant
ON
Thermistor Temperature
Above 50F
50F to 20F
Below 20F
needs
to beisreplaced.
If it’s
Thermistor
open or shorted
suspected that the thermistor is operating inaccurately,
check
in the following
instructions.
If thethe
lighttolerance
is on constantly,
the thermistor
is open or
If the light is on constantly, the thermistor is open or shorted and
Disconnect
the
thermistor
from
the
control
board.
shorted
and
needs
to
be
replaced.
If
the
blinking
light
needs to be replaced. If the blinking light sequence doesn’t fall
within
Measure
the
resistance
across
the
two
leads.
Measure
sequence
doesn’t
fall
within
the
range
given
in
the
the range given in the chart, the thermistor needs to be replaced. If
it’s
suspected
that the
is operating
inaccurately,on
check
the
temperature
of thermistor
the thermistor.
(Accuracy
thethe
December
2013
tolerance
in
the
following
instructions.
©
2013
Mitsubishi
Elect
temperature reading is important to prevent a good
Disconnect the thermistor from the control board. Measure the
thermistor
from the
being
replaced).
resistance across
two leads.
Measure the temperature of the
Compare
ohm on
reading
with the
temperature
thermistor. the
(Accuracy
the temperature
reading
is importanton
to the
prevent
a goodBased
thermistor
replaced).temperature the
chart
below.
onfrom
thebeing
thermistor
Compare
the ohm
reading
the temperature
thenumber
chart below.
ohm
reading
should
bewith
within
1-2% of on
the
Based on the thermistor temperature the ohm reading should be
shown
below.
If number
not, and
thebelow.
thermistor
connections
within 1-2%
of the
shown
If not, and
the thermistor
are
not corroded,
the thermistor
should
bebereplaced.
connections
are not corroded,
the thermistor
should
replaced.
o
F
86
84
82
81
79
77
75
73
72
70
68
66
64
63
61
o
Ohms
8,056
8,448
8,862
9,077
9,526
10,000
10,501
11,031
11,307
11,884
12,493
13,139
13,822
14,179
14,924
F
59
57
55
54
52
50
48
46
45
43
41
39
37
36
34
Ohms
15,714
16,551
17,438
17,902
18,873
19,903
20,997
22,159
22,767
24,040
25,394
26,835
28,368
29,171
30,856
o
F
32
30
28
27
26
23
21
19
18
16
14
12
10
9
7
o
Ohms
32,650
34,562
36,601
37,671
38,776
42,315
44,875
47,610
49,047
52,069
55,301
58,759
62,460
64,408
68,510
F
5
3
1
0
-2
-4
-6
-8
-9
-11
-13
-15
-17
-18
-20
Ohms
72,906
77,620
82,676
85,340
90,962
96,999
103,486
110,460
114,141
121,921
130,295
139,313
149,030
154,169
165,048
Circuit Board
Confirm the thermistor is operating properly before
troubleshooting the circuit board.
Make sure the control board has 24 Volts AC when
measured at the 24 VAC and the com terminals. If not,
find the cause of voltage failure.
The circuit board is designed to convert the thermistor
ohm input to a 2 - 9.16 VDC output to control the
position of the damper actuator. Above 2 VDC output
the actuator will start to move the damper toward the
closed position. At 9.16 VDC, the actuator will have
moved 85 degrees and the damper will be
approximately 95% closed. The damper should never
be 100% closed. The chart below includes the various
damper angles based on the different outdoor
temperatures. Measure the DC voltage output on the
circuit board at com (-) and the out (+) terminals. If the
Specifications are subject to change without notice.
output doesn’t match the thermistor input ohms as
shown below, replace the circuit board.
Outdoor
Temperature
o
Thermistor
Ohms
Control board
DC volts output
Damper
Angle
o
3
measured at the 24 VAC and the com terminals. If not,
nd the cause of voltage failure.
The circuit board is designed to convert the thermistor
hm input to a 2 - 9.16 VDC output to control the
Circuit Board
Interlock Relay
osition
of the
damper
actuator.
2 VDC output
Confirm
the thermistor
is operating
properlyAbove
before troubleshooting
The interlock relay uses a normally closed contact to allow power
the circuit board.
to flow to the transformer energizing the low ambient kit control
he actuator
will start to move the damper toward the
Make sure the control board has 24 Volts AC when measured at
circuitry. Any time the outdoor unit is in cooling mode, this contact
have will
losedThe
position.
9.16
VDC,
theAC.
actuator
the
24
VAC and At
theiscom
terminals.
If not,
find
the
ofwill
voltage
be in closed.
When the outdoor unit reversing valves energizes
Damper
Actuator
transformer
208/230
– 24volt
Forcause
proper
failure.
(switches
to heating
mode) the
of the relay
is energized,
opening
moved
85 degrees
the
damper
willdiagram
be
Before trouble
shooting
thecoildamper
motor,
verify the
connections
to the and
outdoor
unit,
the following
The circuit board is designed to convert the thermistor ohm input
this contact. This in-turn de-energizes the transformer, disconnecting
two factory switches are in the position shown below.
and
instructions
should
be referred
to.
pproximately
95%
closed.
damper
should never
to a 2 - 9.16 VDC
output
to control The
the position
of the damper
power to the low ambient kit control circuitry. This allows the damper
actuator.
Above 2 VDC
output
the actuator
will includes
start to move the
to spring return to the full open position
during
heating mode.
Damper
Actuator
be 100%
closed.
The
chart
below
the various
damper toward the closed position. At 9.16 VDC, the actuator will
To check, make sure the contact is closed when the outdoor unit is in
black
Black and
amper
angles
onthethe
different
outdoor95%
(1)the contact
Commonis open when the
have
moved 85based
degrees and
damper
will be approximately
cooling mode (coil de-energized)
closed. The damper should never be 100% closed. The chart
outdoor unit is in thered
heating mode (coil energized).
emperatures.
Measure the DC voltage output on the
Red
(2)
+ Hot
below includes the various damper angles based on the different
ircuit
boardtemperatures.
at iscom
(-) –and
out
(+)
terminals.
the Actuator
outdoor
Measure
thethe
DC
voltage
on the circuit If
Damper
Damper
Actuatorwhite White
The transformer
208/230
24volt
AC.
For output
proper
(3)
2-10VDC
board at com
(-) and
the outunit,
(+) terminals.
If the output
doesn’t match Before
Before trouble
trouble shooting
thethe
damper
motor,motor,
verify the
two factory
connections
to
the
outdoor
the
following
diagram
shooting
damper
verify
the
utputthedoesn’t
match
the
thermistor
input
ohms
as
thermistor input ohms as shown below, replace the circuit board.
switches are in the positionOrange
shown below.
(5)
and instructions should be referred to.
two factory switches are in the position
shown below.
hown below, replace the circuit board.
Outdoor
Temperature
o
Thermistor
Ohms
N/A
Control board
DC volts output
2.00
Damper
Angle
Y=0 Damper
Y=0 Actuator
black
o
Above 52 F
0 full open
52
18,873
2.00
0o
o
50
19,903
3.25
15
o
45
4.50
30
The low ambient
kit is22,767
designed to function
with both
40
26,104
5.80
45o
208/230 volt and also 460 volt outdoor units.
35
30,000
7.04
60o
On 208 volt
units the 34,562
CNAC2 connector
will provide o
30
7.90
70
red
white
Black
(1)
Common
Red
Hot
Factory (2)
switch +positions
White
(3)
2-10VDC
Make sure the motor has 24 volts on the (1) Common
Orange If (5)
and (2) +Hot connections.
not, find the cause of the
voltage failure and correct.
Y=0
Y=0
The damper actuator receives a DC voltage signal
from the circuit board. This voltage can be measured
between (1) Common and (3) 2-10VDC connections.
The damper actuatorFactory
has an
angle
indicator where it
switch
positions
clamps
onto
the damper shaft linkage.
Damper
Actuator
Compare
themotor
DCshooting
voltage
supply
to
damper
anglethe
Before
the
damper
verify
Make
sure trouble
the
has 24
volts
onthe
themotor,
(1) Common
Make
sure
the
motor
has
24
volts
on
the
(1)
Common
and
(2) +Hot
indicator
position
in
the
chart
below.
The
angle
should
two
switches areIf in
thefind
position
shown
and
(2) factory
+HotIfconnections.
not,
the cause
of below.
the
connections.
not,
cause
of the
voltage
and
correct.
of find
the the
chart
shown
below.
Iffailure
not, check
to
be within 2%
voltage
failure
and correct.
The
damper
receives
a DC voltage
signal
from the circuit
Damper
Actuator
make
sureactuator
the damper
started
off in the
correct
The
damper
actuator
receives
a DC
voltage
signal and (3)
board.
This voltage
can
be
measured
between
(1) Common
black
position.
0 Degrees
(1)can Common
2-10VDC
connections.
from
the circuit
board. ThisBlack
voltage
be measured
The damper
has
angle
where
it clamps onto the
red an
between
(1) actuator
Common
and
(3) indicator
2-10VDC
connections.
(2)
+ Hot
IMPORTANT!
damper
shaft actuator
linkage. has Red
The
damper
an
angle
indicator
whereshaft
it
It’s possible
during
theangle
damper
Compare
the DCthat
voltage
supplyshipping,
to the damper
indicator
white
White linkage.
(3)
2-10VDC
clamps
onto
the
damper
shaft
may have
in the
shaft
clamp
position
in themoved
chart below.
Theactuator
angle should
be within
2% of the
Compare
thebelow.
DC voltage
supply
to the
damper
angle
chart
shown
Ifpower
not, check
to
make
sure
the
damper
started
assembly.
With
off,
make
sure
the
damper
is off
Orange
(5)
indicator
position
in
the
chart
below.
The
angle
should
ininthe
correct
position.
0
Degrees
the full open position. 0 degrees If necessary,
beloosen
within 2%
the chart
below.
If not,
check
Y=0 the
Y=0
the of
shaft
clampshown
on
actuator,
move
theto
IMPORTANT!
make
sure
the
damper
started
off
in
the
correct
damper to the 100% open position, and re-clamp
It’s possible
that during shipping, the damper shaft may have
position.
0 Degrees
tightly.
moved in the actuator shaft clamp assembly. See Section 3.
208 volts25to the control
transformer. 8.75
39,917
80o
On 230 volt
CNAC2 connector
20 units the 46,220
9.16 will provide
85o
230 volts
transformer. 9.16
Belowto
20othe
F controlN/A
85o
The 460 volt units include a transformer that reduces
Transformer
the outdoor unit internal voltage to 230 volts. Because
Transformer
of
this,
on thekit
460
volt
units
CNAC2
connector
will to
is
208/230
–the
AC.
Forconnections
proper
TheThe
low
ambient
designed
to24volt
function
with
both
Thetransformer
transformer
is is
208/230
– 24volt
AC. For
proper
also
provide
230
volts
to
the
control
transformer.
connections
toalso
the
outdoor
unit, the
following
diagram
the outdoor
unit,
the following
and
instructions
should be
208/230
volt and
460
voltdiagram
outdoor
units.
Once
the propershould
connection
is confirmed,
measure
referred
instructions
beconnector
referred
to.
On and
208
volt to.
units the CNAC2
will provide
voltage on the primary side of the transformer. It
208 volts to the control transformer.
should be 208 or 230 +- 10% depending on the supply
230
volt units the CNAC2 connector will provide
c On
US,
Inc.
voltage
at the outdoor unit. If there is no voltage on the
230 volts to the control transformer.
primary side of the transformer check the fuse that is
The located
460 voltinunits
include
a transformer
that reduces
the fuse
holder
inside the outdoor
unit. See
the outdoor
unit
internal
voltage
to
230
volts.
Because
wiring diagram for fuse location. Once power
has been
of this,
on the 460
volt
units the
connector will
confirmed
at the
primary
sideCNAC2
of the transformer,
check
also the
provide
230 volts to
the control
secondary/low
voltage
side oftransformer.
the transformer it
Once
the proper
connection is
should
be approximately
27confirmed,
volts. If no measure
voltage is
voltage
on
the
primary
side
of
the
present, replace transformer. transformer. It
should be 208 or 230 +- 10% depending on the supply
voltage
at the Relay
outdoor unit. If there is no voltage on the
Interlock
primary
side
of
the
transformer
check the
fusecontact
that is to
The interlock
relay
uses a normally
closed
Damper Blade Adjustment. Factory switch positions
located
in power
the fuse
holder
inside
the outdoor
unit. See
IMPORTANT!
allow
to flow
to the
transformer
energizing
the
If the damper actuator angle doesn’t match within 2%,
The
low ambient
kit location.
is designed
to function
with
both
wiring
for
Once
power
has
been
It’s
possible
that during
shipping,
damper
lowdiagram
ambient
kitfuse
control
circuitry.
Any
time the
outdoor
the corresponding
boardthe
voltage
Ifwith
the
damper
actuator
anglecontrol
doesn’t
match
within
2%,supplied
withshaft
the
208/230
volt
and
alsoside
460
volt
outdoor
units.
Make
sure
the motor
has
24actuator
volts
onas
the
(1)bebelow,
Common
corresponding
control
board
voltage
supplied
shown
the
confirmed
at
the
primary
of
the
transformer,
check
may
have
moved
in
the
actuator
shaft
clamp
contact
will
be
in
closed.
unit
is
in
cooling
mode,
this
as
shown
below,
the
damper
should
The low ambient kit is designed to function with both 208/230 volt
208the
volt
units
the
will provide
and (2)
+Hot
connections.
If not,
findthe
the damper
cause ofisthe
damper
actuator
be replaced.
the On
secondary/low
side ofconnector
the
transformer
it
assembly.
Withshould
power
off, make
sure
When
outdoor
unitCNAC2
reversing
valves
energizes
replaced.
and also
460
voltvoltage
outdoor
units.
208
volts
to
the
control
voltage
failureposition.
and correct.
should
approximately
27transformer.
volts.
nowill
voltage
is208isvolts to the in the
full open
0 degrees If necessary,
(switches
tounits
heating
mode)
the Ifcoil
of
the
relay
Onbe
208
volt
the
CNAC2
connector
provide
On
230
volt
units
the
CNAC2
connector
will
provide
The
damper
actuator
receives
a DC
voltage
signal
control
transformer.
present,
replace
transformer.
energized,
opening
this contact. This in-turn deloosenOutdoor
the shaft clamp
on
theControl
actuator,
moveDamper
the
Thermistor
board
On
230
volt
units
the
CNAC2
connector
will
provide
230
volts
to
the
230
volts
to
the
control
transformer.
from
the
circuit
board.
This
voltage
can
be
measured
Temperature
Ohms
DC
volts
output
Angle
energizes the transformer, disconnecting power to the
damper to the 100% open position, and re-clamp
o
o
control
transformer.
N/A
2.00
Above 52 F(1) Common
0 full open
The
460
volt kit
units
include
a transformer
thatthe
reduces
between
and (3) 2-10VDC
connections.
low
ambient
control
circuitry.
This allows
damper
Interlock
Relay
tightly.
The
460
volt
units
include
a
transformer
that
reduces
the
outdoor
52
18,873has an angle
2.00 indicator where
0o
outdoor
unituses
internal
voltage
to 230 contact
volts. Because
The damper actuator
it
to
spring
return
to
theafull
open position
during
heating
Thethe
interlock
relay
normally
closed
o
unit internal
voltage
to 230
volts. Because
of this, on theto460 volt
50
19,903
3.25
15
of
this,
on
the
460
volt
units
the
CNAC2
connector
will
clamps
onto
the
damper
shaft
linkage.
mode.
allowunits
power
to flow connector
to the transformer
energizing
If the damper
actuator angle doesn’t4.50
match within 2%,
the CNAC2
will also provide
230 volts the
to the control
45
30o
provide
230 sure
volts
to the
control
transformer.
the DC 22,767
voltage
tovoltage
the damper
angle
To
check,
the
contact
is
closed
when the
low also
ambient
kitmake
control
circuitry.
Any
time
the outdoor
withCompare
the corresponding
controlsupply
board
supplied
o
transformer.
40
26,104
5.80
45
Once
the
proper
connection
is
confirmed,
measure
indicator
position
in
the
chart
below.
The
angle
should
outdoor
unit
is
in
cooling
mode
(coil
de-energized)
and
Once
the
proper
connection
is
confirmed,
measure
voltage
on
the
unit is in cooling mode, this contact will be in closed.
as shown35below, the 30,000
damper actuator
7.04should be 60o
primary
sidethe
of the
transformer.
should
be
208 is
or in
230the
voltage
on
primary
side
the transformer.
It+- 10%
o
the
contact
is
open
when
theItofoutdoor
unit
be within
2% of the
chart shown7.90
below. If not, 70
check
to
30
When
the
outdoor
unit
reversing
valves
energizes
34,562
replaced.
depending
on the
voltage
atdepending
the
unit.
If there
is no
heating
mode
(coil
energized).
should
208
orsupply
230
+10%
on is
the
supply
make25sure the damper
in the correct
39,917 started off
8.75
80o
(switches
tobe
heating
mode)
the
coil
of outdoor
the relay
voltage on
the primary
side
of the
transformer
the fuse
that is
20
46,220
voltage
at the
outdoor
unit.
If This
there
is nocheck
voltage
on the
position.
85o
energized,
opening
this contact.
in-turn
deOutdoor 0 Degrees
Thermistor
Control9.16
board
Damper
located in the fuse holder inside the outdoor unit. See wiring diagram
o
N/A
9.16
Below 20 F
85o
primarythe
side
of the transformer
check power
the fuse
that is
Temperature
Ohms
DC volts output
Angle
energizes
transformer,
disconnecting
for fuse location.
Once power
has been confirmed
at to
thethe
primary
o
o
N/A
2.00
inkitthe
fuse holder
the
outdoor
unit.side
Seeof
IMPORTANT!
Above
52 F
0 full open
low located
ambient
control
circuitry.
allows
the
damper
side of the
transformer,
check inside
theThis
secondary/low
voltage
18,873
2.00
0o
wiring
diagram
for
fusebe
location.
Once
been is
It’s52possible that
during shipping,
the damper
shaft
the transformer
should
approximately
27power
volts.heating
If has
no voltage
to spring
return
to itthe
full
open
position
during
December
2013
50
19,903
3.25
15
confirmed
at thetransformer.
primary side of the transformer, check
may have moved in the actuator shaft clampo
present, replace
4
mode.
© 2013 Mitsubishi Electricassembly.
US,
45 Inc.
4.50 sure the damper
30o
the secondary/low
voltage
side
the transformer
With22,767
power off, make
is
To check,
make sure the
contact
is of
closed
when the it
o
40
5.80
45 US, Inc.
Specifications
are subject to change
without
notice.
© 2015 Mitsubishi
Electric
should
27
volts.
If no voltage and
is
in the
full open26,104
position. 0 degrees
If necessary,
outdoor
unitbeisapproximately
in cooling mode
(coil
de-energized)
o
35
30,000
7.04
60
transformer.
loosen
the shaft clamp on the actuator, move
the
the present,
contact isreplace
open when
the outdoor unit is in the
30
34,562
7.90
70o
damper
to the 39,917
100% open position,
and
re-clamp
o
heating 4mode (coil energized).
25
8.75
80
Interlock Relay
tightly.
20
46,220
9.16
85o
3
100%. The damper should never be 100% closed during operation. When working properly
the
damperBlade
will be
approximately 95% closed at 20 degrees and below. The following
3.
Damper
Adjustment
procedure will allow proper adjustment.
IMPORTANT!
The Belimo
within
LAHK control box
has to
a built in
The Belimo damper motor within the LAHK control
boxdamper
has amotor
built
in the
mechanical
stop
It’s possible that during shipping, the damper shaft may have
mechanical stop to adjust the maximum angle of rotation. This must
moved
in the
actuator
shaft clamp
assembly.
In some cases
due must
be adjusted
to 85 degrees
damper blade
verified or
adjust
the
maximum
angle
of rotation.
This
be adjusted
to and
85 the
degrees
andposition
the damper
to manufacturing tolerances the LAHK blades could close 100%.
re-set to the proper position (1/4” open) to ensure the unit functions
The
damperposition
should never
be 100% or
closed
during
properly.
blade
verified
re-set
tooperation.
the proper position
(1/4” open) to ensure the unit
When working properly the damper will be approximately 95%
closed
at 20° and properly.
below. The following procedure will allow proper
functions
adjustment.
Belimo motor angle indicating
Belimo motor angle indicating
scale
shown
below.
scale
shown below.
The factory setting for the mechanical
The factory setting for the mechanical stop
stop isisshown
below
shown below
at 95 at 95.
IMPORTANT! ENSURE POWER IS OFF BEFORE STARTING!!
Basic Service Overview
1. Set damper motor stop to 85 degrees.
2. Loosen “U” bolts on damper shaft.
3. Crank motor against 85° stop then lock into position.
4. Set damper to approx. ¼” open.
(Use damper crank handle as spacer.)
5. Re-Tighten “U” bolts on damper shaft.
6. Release motor by slightly cranking with handle.
Check operation manually.
7. The goal is to have ¼” opening on damper assembly
in the 85 degree position.
IMPORTANT! ENSURE POWER IS OFF BEFORE STARTING!!
Basic Service Overview
1.) Set damper motor stop to 85 degrees.
2.) Loosen “U” bolts on damper shaft
3.) Crank motor against 85 degree stop then lock into position
4.) Set damper to approx. ¼” open. (Use damper crank handle as spacer.)
5.) Re-Tighten “U” bolts on damper shaft
6.) Release motor by slightly cranking with handle. Check operation manually
7.) The goal is to have ¼” opening on damper assembly in the 85 degree position.
© 2015 Mitsubishi Electric US, Inc.
Specifications are subject to change without notice.
5
Slide
STEP
STEPBYBYSTEP
STEPINSTRUCTIONS
INSTRUCTIONS
Slidethe
themechanical
mechanicalstop
stoptoto8585(halfway
(halfway
between
8
and
9)
and
tighten
the
screw,
STEP
BY
STEP
INSTRUCTIONS
STEP
BY
STEP
INSTRUCTIONS
Loosen
the
Philips
head
screw
for
the
11 Loosen the Philips head screw for the 22 Slide
between
8 and 9) and
tighten
the
screw,
Slide
the
the
mechanical
mechanical
stop
stop
toto
8585
(halfway
(halfway
making
sure
the
locating
teeth
on
the
stop
mechanical
stop.
making
sure
the
locating
teeth
on
the
stop
Slide
the
mechanical
stop
to
85
(halfway
mechanical
stop.
between
between
8
and
8
and
9)
9)
and
and
tighten
tighten
the
the
screw,
screw,
Slide
the
mechanical
stop
to
85
(halfway
Loosen
Loosen
the
the
Philips
Philips
head
head
screw
screw
for
for
the
the
STEP
BY
STEP
INSTRUCTIONS:
2 2 are engaged into the actuator motor teeth.
11
are
engaged
into
the
actuator
motor
teeth.
between
and
and
tighten
the
screw,
making
sure
sure
the
the
locating
locating
teeth
teeth
on
on
the
the
stop
stop
between
8 8and
9)9)
and
tighten
the
screw,
Loosen
the
Philips
head
screwfor
for
the 22.
mechanical
mechanical
stop.
stop.
2 making
the
Philips
screw
the
1 Loosen
1. 1Loosen
the Philips
head
screw head
for the mechanical
stop.
Slide the mechanical stop to 85 (halfway between 8 and 9) and
making
sure
the
locating
teeth
onthe
the
stop
are
are
engaged
engaged
into
into
the
the
actuator
actuator
motor
motor
teeth.
teeth.
making
sure
the
locating
teeth
on
tighten
the
screw,
making
sure
the
locating
teeth
onstop
the
stop are
engaged into the actuator motor teeth.
areengaged
engagedinto
intothe
theactuator
actuatormotor
motorteeth.
teeth.
are
mechanicalstop.
stop.
mechanical
Loosen
Loosenthe
the(2)(2)nuts
nutsononthe
the
damper
shaft
“U”
clamp
damper
shaft
“U”on
clamp
Loosen
Loosen
the
the
(2)
nuts
nuts
on
the
the
1.(2)
3
3
3. Loosen the (2)damper
nuts
on the
damper
shaft
“U”
clamp.
Loosen
the
nuts
onthe
the
damper
shaft
shaft
“U”
“U”
clamp
clamp
Loosen
the
(2)(2)
nuts
on
33
dampershaft
shaft“U”
“U”clamp
clamp
damper
33
Lock
Lockthe
themotor
motorininthe
the
55
5. Lock the motor in85
the degree
85 degreeposition.
position.
85the
degree
position.
Lock
Lock
the
motor
motor
inin
the
the
55
Lock
themotor
motor
the
85
85
degree
degree
position.
position.
Lock
the
ininthe
55
degreeposition.
position.
8585degree
Specifications are subject to change without notice.
6
Using
Usingthe
thecrank
crankhandle
handleturn
turnthe
themotor
motor
until
the
indicator
snugs
44 counterclockwise
counterclockwise
until the
indicator
snugs
Using
Using
the
the
crank
crank
handle
handle
turn
turn
the
the
motor
motor
against
the
stop
at
85
degrees.
against
theuntil
stop
atthe
85
degrees.
Using
thecrank
crank
handle
turn
themotor
motor
counterclockwise
until
the
indicator
indicator
snugs
snugs
Using
the
handle
turn
the
4 4 counterclockwise
4. Using the crank handle turn the motor counterclockwise until the
counterclockwise
until
the
indicator
snugs
against
against
the
the
stop
stop
atthe
at
85
85
degrees.
degrees.
until
indicator
snugs
44 counterclockwise
indicator
snugs against
the
stop
at
85
degrees.
againstthe
thestop
stopatat8585degrees.
degrees.
against
66
6.
66
66
Close
Closethe
theblades
bladesbybyhand
handand
andinsert
insert
Crank
handle
under
damper
blade
near
Crank
handle
under
damper
blade
near
Close
Close
the
the
blades
byby
hand
hand
and
and
insert
insert
Close
the blades
byblades
hand and
insert
Crank
handle
under
the
screws
as
shown
to
ensure
it
is
open
damper
blade
near
the
screws
as
shown
to
ensure
it is open
the
screws
as
shown
tohand
ensure
itinsert
is
open
Close
the
blades
byhand
and
Crank
Crank
handle
handle
under
under
damper
damper
blade
blade
near
near
Close
the
blades
by
and
insert
approximately
¼
inch
at
85
degrees.
approximately
¼¼inch
atat8585degrees
approximately
inch
Crank
handle
under
damper
blade
near
the
the
screws
screws
asas
shown
shown
to
to
ensure
ensure
itdegrees
it
is is
open
open
Crank
handle
under
damper
blade
near
the
screwsasasshown
shown
toensure
itisisopen
open
approximately
approximately
¼¼
inch
inch
atensure
at
8585
degrees
the
screws
to
itdegrees
approximately¼¼inch
inchatat8585degrees
degrees
approximately
© 2015 Mitsubishi Electric US, Inc.
on the handle
damper
shaft “U”
clamp.
re-tighten
the (2)
nuts
7
on the damper shaft “U” clamp.
7 7.
8
8
8.
Holding the blades against the
handle re-tighten the (2) nuts
Holding
againstshaft
the handle
on the
theblades
damper
“U”re-tighten
clamp.the (2) nuts on
the damper shaft “U” clamp.
Ensure end of shaft is flush to
Ensure
end of
shaft
is flush
edge
of clamp
black
surface
as to
Ensure
end
shaft
isblack
flush tosurface as
shown.
edge
ofofclamp
edgeend
of clamp
as black surface as shown.
Ensure
of shaft isblack
flush tosurface
edge of clamp
shown.
shown.
Ensure end of shaft is flush to
edge of clamp black surface as
shown.
Slightly crank the handle to release
Slightly crank the handle to release
the motor. The damper will return
Slightly
crank
the handle
release thewill
motor.
The damper will
the
motor.
Thetodamper
return
to the
open position.
return to the open
position.
to the
the open
position.
crank
handle
release
Slightly
crank
the
handle to
to release
8Slightly
the motor.
TheThe
damper
return
the motor.
damper will
will return
to the
openposition.
position.
to the
open
Review and Manual Test
To ensure the LAHK unit is functioning as designed. Crank the Belimo motor back to the 85 degree position and visually check that the
damper does not close completely. Your goal is approximately ¼” opening between the blades at the 85 degree position.
Review and Manual Test
Review
Test
To ensureand
the Manual
LAHK unit is
functioning as designed. Crank the Belimo motor back to
85 degree
position
and
checkas
that
the damper
does
notBelimo
close completely.
Tothe
ensure
the LAHK
unit
is visually
functioning
designed.
Crank
the
motor back to
Review
and
Manual
Test
Your
goal
is
approximately
¼”
opening
between
the
blades
at
the
85
degree
position.
the 85 degree position and visually check that the damper does not close
completely.
To ensure the LAHK unit is functioning as designed. Crank the Belimo motor back to
Your goal is approximately ¼” opening between the blades at the 85 degree position.
the 85 degree position and visually check that the damper does not close completely.
Your goal is approximately ¼” opening between the blades at the 85 degree position.
Review and Manual Test
To ensure the LAHK unit is functioning as designed. Crank the Belimo motor back to
the 85 degree position and visually check that the damper does not close completely.
Your goal is approximately ¼” opening between the blades at the 85 degree position.
© 2015 Mitsubishi Electric US, Inc.
Specifications are subject to change without notice.
7
Damper Actuator Manual Override
Damper Actuator Manual Override
IMPORTANT! Never manually override the damper
4. Damper
Manual
Override
position
if Never
the Actuator
outdoor
unit
could switch
to heating
IMPORTANT!
manually
override
the damper
mode
during
the
override
period.
Heating
mode
position if the outdoor unit could switch to heating
IMPORTANT!
Never
manually
override
the damper
position
requires
the
damper
to
be
fully
open
for
full
mode during the override period. Heating mode
ifcapacity.
the outdoor unit could switch to heating mode during the
requires
the damper to be fully open for full
Useprocedure.
the following diagrams and instructions for this
procedure.
override period. Heating mode requires the damper to be fully
capacity.
open for full capacity.
It may be desirable to manually override the damper
position
and lockto
into position
until
repairs
can beand
It
may
desirable
override
the damper
position
It may
bebedesirable
toitmanually
manually
override
the damper
completed.
If
so,
select
an
average
temperature
typical
lock
it
into
position
until
repairs
can
be
completed.
If
so,
select
an
position and lock it into position until repairs can be
average
temperature
typical for theduring
outsidethe
environment
during
the
for the outside
environment
override
period,
completed.
If so, select
an average
temperature
typical
override
period,
and
then
use
that
average
temperature
to
find
the
to find
the
andoutside
then use
that average
temperature
for the
environment
during
the override
period,
desired
damper
angle in the chart
damper
angle intemperature
thebelow.
chart below.
to find the
anddesired
then use
that average
desired damper angle in the chart below.
Outdoor
Thermistor
Control board
Damper
Temperature
Ohms
DC volts output
Angle
Outdoor
Thermistor
Control board
Damper
o
N/A
2.00
Above 52 F
0o full open
Temperature
Ohms
DC volts output
Angle o
52
18,873
2.00
0
o
N/A
2.00
Above 52 F
0o full open o
50
19,903
3.25
15
o
52
18,873
2.00
0
o
45
22,767
4.50
30
50
19,903
3.25
15o
o
40
26,104
5.80
45
o
45
22,767
4.50
30
o
35
30,000
7.04
60
o
40
26,104
5.80
45
o
30
34,562
7.90
o 70
35
30,000
7.04
60
o
25
39,917
8.75
80
o
30
34,562
7.90
70
o
20
46,220
9.16
85
25
39,917
8.75
80o
o
o
N/A
9.16
Below 20 F
85
o
20
46,220
9.16
85
o
o
N/A
9.16
Below 20 F
85
Follow the instructions below for manually positioning
and
locking
the damper
in
place.
Follow
theinstructions
instructions
below
forfor
manually
positioning
and locking
Follow
the
below
manually
positioning
damperthe
in place.
andthe
locking
damper in place.
IMPORTANT! Disconnect power to the damper
IMPORTANT!
Disconnect
to the damper motor before
motor before
lockingpower
inpower
place.
IMPORTANT!
Disconnect
to the damper
locking in place.
motor before locking in place.
Thedamper
damper
actuator
comes
crankattached,
handleto
The
actuator
comes
with a with
crankahandle
attached,
to
manually
move
the
damper
position.
The
manually
move
the
damper
position.
The
crank
handle
The damper actuator comes with a crank handle is removable
and
if
it’s
missing,
a
3/16”
allen
wrench
will
work
just
as
well.
crank
handle
is
removable
and
if
it’s
missing,
a
3/16”
attached, to manually move the damper position. The
allen
wrench
will work just
well.
crank
handle
is removable
andas
if it’s
missing, a 3/16”
allen wrench will work just as well.
Angle Indicator
Angle Indicator
Use the following diagrams and instructions for this procedure.
December 2013
December 2013
Specifications are subject to change without notice.
8
© 2013 Mitsubishi Electric US, Inc.
© 2013 Mitsubishi Electric US, Inc.
5
© 2015 Mitsubishi Electric US, Inc.
5
5. Parts List
December 2013
© 2015 Mitsubishi Electric US, Inc.
© 2013 Mitsubishi Electric US, Inc.
6
Specifications are subject to change without notice.
9
6. Wiring Diagram
LAHK-1 Wiring Diagram
Control Box Mounted on Hood
green
40 VA
Transformer
Ground
orange
Damper Actuator
208v
white
black
230V
black
black
red
red
red
red
24 V
red
Com
white
240 volt ac
NC Relay
Terminal strip
Black
(1)
Common
Red
(2)
+ Hot
White
(3)
2-10VDC
Orange
(5)
Y=0
Y=0
Circuit Board
Sensor
+
Factory switch positions
2-10VDC
-
C24v +
Outdoor Unit Control Board
10K ohm thermistor
CNAC2 Connection
common (blk)
1 amp fuse
230/460v (wh)
black
CNAC2
white
208v (or)
M
F
F
Insert the black plug into the CNAC2 connection
on the board. Connect the white wire (male
connector) to the wire that corresponds to the
outdoor unit supply voltage as shown below
move and secure cap to unused wire
208 volt = orange wire (female connector)
230/460 volt = white wire (female connector)
CN505 Connection
To reversing valve 21S4a
yellow
red
red
green
F
M
6
5
4
3
2
1
M
F
Low Ambient Hood
Part Number
LAHK-1
Supply Voltage
208/230V, 1-phase, 60Hz
Amps
0.20
Fuse Size
1 amp
For use with Modular PURY and PUHY
outdoor units
T/Y(S)KMU & T/Y(S)LMU Series Only
Serial Number
Date of Manufacture
CN505
Disconnect white plug with four wires from
the CN505 connection. Plug the white
male connector from the low ambient kit onto
the CN505 connection. Connect the white
plug with four wires onto the spare connection.
Initials
Manufactured for Mitsubishi Electric US, Inc
Low Ambient Kit-LAHK-City Multi -Wiring Diagram.xls
Specifications are subject to change without notice.
10
© 2015 Mitsubishi Electric US, Inc.
© 2015 Mitsubishi Electric US, Inc.
Specifications are subject to change without notice.
11
This product is designed and intended for use in the
commercial environment.
Please be sure to put the contact address/telephone number on
this manual before handing it to the customer.
Manufactured for MITSUBISHI ELECTRIC US, INC.
1340 Satellite Boulevard. Suwanee, GA 30024
Toll Free: 800-433-4822 www.mehvac.com
®
CITYMULTI Low Ambient Hood LAHK-1 Technical & Service, May 2015
Specifications are subject to change without notice.
© 2015 Mitsubishi Electric US, Inc.