Heater Turn On/Off Priority Control; Force Heater Mode - Panasonic WH-MXC16J9E8 Service Manual

13.9 Heater Turn ON/OFF priority Control

Purpose:
To allow only one heater between room and tank heater to turn ON at the same time due to both heater
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power supplies is sharing the same ELCB. Prohibit two heater sources to turn ON at the same time to avoid
overcurrent.
Start condition:
Tank heater function select YES by remote controller
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Control contents:

When there is only one heater source (Room Heater or Tank Heater) request to turn ON, operate same as
normal room heater and tank heater operation.

When both backup heater and booster heater request to turn ON at same time, will turn ON only ONE heater
source. Under normal condition, tank heater has priority to turn ON except below condition.
1 Backup Heater Priority to Turn ON when
Request Backup heater turn ON at Hex Protection control during deice.
o
Request Backup Heater turn ON at Hex Protection Control during low water temperature.
o
Request Backup Heater turn ON at Anti-frost control.
o
Heat pump error and Force Mode operate.
o

When switching from booster heater to backup heater OR backup heater to booster heater, need to delay
5 seconds in between Turn OFF one heater source and Turn ON another heater source.

13.10 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 latest 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 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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Mode change 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
: 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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