Download Worcester 28i Junior Specifications

Is the multiway
connector at board
position ST16 pushed
fully home on to the
board?
3. Technical Data
No
Push fully home
Table 1.
No
Re-fix sensor onto pipe
Yes
Remove multiway
connector from board
position ST16. Test
resistance across pins
16 and 17 ( yellow
wire). Is it between 1
kOhm and 30 kOhm?
7.5
23.5
No
Is there continuity
from individual pins
16 and 17 to DHW
sensor?
No
TEST E
No
110
INTERNAL FIX
mm
130
EXTENDED FLUE
275/*425
MAXIMUM LENGTH mm
725
MAXIMUM LENGTH mm
3000
FLUE ASSEMBLY DIAMETER
mm
100
MAXIMUM LENGTH mm
3000
mm
1100
TERMINAL ASSEMBLY
* NOTE : Minimum uncut length
Table 3
Air pressure switch
is shorting.
Check tubes for
blockage or replace
switch.
MAXIMUM AVAILABLE PUMP HEAD
HEAD
Metres
MIN. FLOW RATE
L/min.
FLOW/RETURN
DIFFERENTIAL
°C
8
4.5
10.4
11
23.5
2.2
18.3
18
27.5
2.0
18.3
21
BOILER OUTPUT
kW
Yes
No
Table 4
MECHANICAL SPECIFICATIONS
CENTRAL HEATING FLOW - COMPRESSION
Yes
mm
MINIMUM LENGTH mm
VERTICAL DUCT
Yes
No
Repair or replace
harness.
EXTERNAL FIX
VERTICAL FLUE
Check or replace
CH sensor.
Test resistance across
contacts to black &
red cables. Is it
between 30 and 90
ohms?
Table 2.
STANDARD FLUE
No
BOILER ADJUSTED FOR G31 (Propane)
9.5
3.4
30.0
35.3
LPG (Propane): Net Input = Gross Input x 0.921
WALL HOLE DIAMETER
Yes
Turn off electrical
supply.
Remove fan connector
from board position
ST1.
Test resistance across
contacts to black &
white cables.
Is it between 75 and
175 ohms?
8.0
27.5
HORIZONTAL FLUE
Yes
Test resistance across
contacts 14 and 15
(green wire).
Is it open circuit?
BOILER ADJUSTED FOR G31 (Propane)
9.5
4.6
0.39
25.9
35.0
1.06
FLUE DETAILS
Yes
Is there continuity
from individual
contacts 12 and 13 to
CH sensor?
28i
NOMINAL BOILER RATINGS (10 Minutes After Lighting)
BOILER ADJUSTED FOR G20 (Natural Gas)
BURNER
OUTPUT
INPUT (Net)
GAS RATE
PRESSURE
kW
kW
m bar.
m3/h
8.0
9.5
1.2
1.00
27.5
30.0
14.7
3.17
Natural Gas: Net Input = Gross Input x 0.901
Repair or replace
harness.
Check or replace
DHW sensor.
Test resistance across
contacts 12 and 13
(red wire). Is it
between 1 kOhm and
30 kOhm?
Table 1.
NOMINAL BOILER RATINGS (10 Minutes After Lighting)
BOILER ADJUSTED FOR G20 (Natural Gas)
BURNER
OUTPUT
INPUT (Net)
GAS RATE
PRESSURE
kW
kW
m bar.
m3/h
7.5
9.5
1.4
1.00
23.5
25.9
13.6
2.74
Yes
Check the DHW
sensor. Is it correctly
fitted onto the pipe
with heat conductive
paste between the
pipe and sensor?
24i
Check/repair fan
harness or repalce fan.
Yes
RETURN - COMPRESSION
22mm
22mm
15mm
15mm
DOMESTIC WATER FLOW - COMPRESSION
15mm
15mm
3
Rp ⁄4
3
Rp ⁄4
RELIEF VALVE DISCHARGE
15mm
15mm
CASING HEIGHT
600mm
600mm
CASING WIDTH
400mm
440mm
CASING DEPTH
325mm
325mm
WEIGHT - LIFT
22kg
23.5kg
WEIGHT - PACKAGED
37kg
40kg
WEIGHT - DRY
40
28i
22mm
COLD WATER INLET - COMPRESSION
GAS INLET
No
24i
22mm
34.7kg
5
37.5kg
0.39
1.23