Force Heater Mode - Panasonic WH-SDC09H3E8 Service Manual

12.10 Force Heater Mode

Purpose of Force Heater Mode
As a backup heat source when heat pump error. Force heater Mode control backup heater to heat up the
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room circuit, and turn ON back up heater or booster heater to boil up tank water base on the tank heater
selection (internal or external)
Force Heater Control start condition:
Force heater request ON by user OR auto turn ON by remote controller during error AND
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(Force Heater mode can be operate regardless of mode selection, remocon will send the lastest mode
selection and force bit to indoor. Indoor will judge to turn ON heater to room side if it is heat mode selected,
and turn ON heater to heat up tank water base on tank heater selection)
During Error Happen (exclude the error list below)
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Error List which not allow Force Heater Operation
H12 Capacity Mismatch
H20 Abnormal Water Pump
H62 Abnormal Water Flow
H70 Abnormal Back-up Heater OLP
H74 PCB Communication Error
[ When tank mode operate with external heater selected & tank heater select ON]
H72 Abnormal tank sensor
Force Heater Control Stop Condition:
Force Heater request OFF OR
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Operation OFF request OR
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Power reset OR
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Error of above list happens during force heater operation.
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Control contents:
1) After fulfil start condition, indoor will operate the force heater operation according to below mode condition
Heat mode Only
Heat + Tank mode
Cool mode Only
Cool + Tank mode
Tank mode Only
* For heat mode condition, backup heater will only turn ON if the backup heater is enable regardless of Room
Heater Selection
* For tank mode condition, If internal heater selected backup heater will turn ON to boil up tank water.
If external heater selected, booster heater will turn ON to boil up tank water regardless of tank heater
selection
Room Side: (Heat Mode)
1) When force heater mode start condition fulfilled, turn ON water pump and turn ON backup heater follow
below control.
2) Operate the 3 ways valve at room side only and turn ON 2 ways valve as heat mode operation.
3) Turn ON the zone pump and mixing valve if system select 2 zone system or Buffer tank connect YES, control
according to normal zone pump and mixing valve control.
4) When Force heater mode stop condition fulfilled, turn OFF heater as below condition and turn OFF water
pump after pump delay time.
Backup Heater On Condition:
a) When Force Heater Control start condition fulfill AND
b) After water pump operate 2 minute AND
c) When water outlet temperature < water set temperature + [-4°C] AND
d) 20 minutes since previous Backup heater Off AND
e) Backup Heater Enable
Backup Heater Stop condition
a) Force mode off OR
b) Operation off OR
c) When water outlet temperature > water set temperature + [-2°C] for continuous 15 secs OR
* ON/OFF follow normal heater sequence.
: Turn ON backup heater to achieve room heat pump target water temperature.
: Turn ON backup heater to heat up room OR Turn ON Heater to Boil up tank water.
: Water pump and backup heater will OFF in force heater mode
: Operate pump and internal Heater OR External heater to Boil up tank water.
: Operate pump and internal Heater OR External heater to Boil up tank water.
H76 Indoor-Remote Controller Communication Error
H95 Abnormal Voltage Connection
F37 Abnormal Water Inlet sensor
F45 Abnormal Water Outlet sensor
H91 Abnormal tank heater OLP
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