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Simultaneous
request space
heating and
domestic water
heating?
No
Normal operation
space heating or
domestic water
heating
Yes (1)
Domestic hot water
production will start
Domestic hot water
temperature reached
A=minimum ([b-01];
55°C)?
No
Domestic hot water
production will
continue without time
limit till A is reached.
Yes
Leaving water
control?
Yes
No
External room
thermostat contol?
Yes
Storage setpoint [b-03]
reached? (*)
No
Yes
Timer [d-01] (30
minutes) passed
since? (1)
No
Operation will
continue in
domestic hot water
No
Space heating
operation will
continue till timer
finished
No
Timer [d-01] (30
minutes) passed
since? (1)
Yes (2)
No
Operation will
switch to space
heating
Operation will switch to
space heating
Timer [d-02] (15
minutes) passed
since? (2)
Yes
Remote controller room
thermostat control.
Storage setpoint [b-03]
reached? (*)
Yes
Operation will switch to
space heating
No
Room
temperature
<Tset –3°C?
Yes
Yes (2)
No
Operation will
continue in
domestic hot water
Yes
Operation will
switch to space
heating
Timer [d-02] (15
minutes) passed
since? (2)
No
No
Timer [d-00] (10
minutes) passed
since? (1)
Yes (2)
Space heating
operation will
continue timer till
finished
(1) are in relation with each other
(2) are in relation with each other
(*) Storage set point can be automatic value if [b-02]=1
HXHD125A7V1B
VRVIII system indoor unit
4PW62584-1A – 11.2010
Installation manual
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