Panasonic WH-MHF09G3E5 Service Manual page 53

Solar Operation Condition (Only during solar priority is set condition)

When solar pump ON, tank heat-up interval end early and 3 ways valve switch to room side.
THERMO IN TEMP:
o
1. THERMO ON TEMP = Heat pump tank target temperature + [-8°C].
2. After heating heat-up interval, always detect tank temperature. Switch to next tank heat-up interval when
tank temperature < THERMO ON TEMP and solar 3 way valve OFF.
Tank interval will end and start heating interval timer, IF
o
1. Tank interval timer finish AND External Room Thermo ON OR
 Only when this condition occur at tank side before tank temperature thermo OFF switch to room side
compulsory and continue until complete room heat-up interval and switch back to tank side.
2. Fulfill Tank thermo OFF condition.
3. Backup heater control:
During heating heat-up interval.
o
 Follow normal back up heater control operation.
During tank heat-up interval.
o
Back up heater OFF during this interval.

4. Booster heater control:
During heating heat up interval.
o
 Booster heater ON/OFF according to booster heater operation control.
During tank heat-up interval.
o
 Once switch from heating heat-up interval to tank heat-up interval, turn OFF the booster heater
and start counting the BOOSTER HEATER DELAY TIMER.
 Booster heater turn ON after BOOSTER HEATER DELAY TIMER fulfill and tank temperature
lower than tank set temperature.
 BOOSTER HEATER DELAY TIMER is clear when switch to heating heat-up interval.
5. Solar 3 way valve
Solar 3WV operates follow solar operates specification.
o
* Under solar priority is set condition, when solar 3WV is ON, booster heater turn OFF.
* Under solar priority is not set condition, solar 3WV only can ON during heating heat-up interval.
6. 2 way valve opens.
Heat + Tank Mode (Heating priority not set)
3 ways valve
on
Tank side
off
Heat Pump
on
off
Booster Heater
on
off
ID Water Pump
on
off
Tank set Temp. = 60°C
Interval Timer
Room side
Tank side
Switch to tank side even the heating interval
timer not yet completed when tank
temperature drop and tank thermo on.
53
Interval Timer
Turn to room heating interval compulsory and
heat up room for the heating interval timer after
[xxx] time of short heating time. After room
heating interval timer, if tank thermo off heat
pump will continue at room side. (Turn to heating
side and run room heating interval compulsory as
well if tank temperature cannot achieve within
tank heat-up interval)