Indoor Back-Up Heater Control - Panasonic WH-MHF12G9E8 Service Manual

12.8 Indoor Back-Up Heater Control

12.8.1 Indoor Electric Heater Control
1 Normal Heating Mode
Heater On condition:
o
a. Heater switch is ON
b. After Heatpump thermo ON for [30] mins
c. After water pump operate [9] mins
d. Outdoor air temperature < Outdoor set temperature for heater
e. When water outlet temperature < Water set temperature + [-8 ° C]
f. [20] minutes since previous Backup heater Off
* When heatpump cannot operate due to error happens during normal operation, heater will go into
force mode automatic
* Heater need to operate during deice operation
Heater Stop Condition:
o
a. When outdoor set temperature > outdoor set temperature + [+2 ° C] for continuous 15 secs OR
b. When water out temp> water set temperature + [-2 ° C] for continuous 15 secs OR
c. Heater switch is Off OR
d. Heatpump thermo-off or OFF condition
2 Force Heater Mode
Heater On condition:
o
a. After water pump operate [9] mins
b. When water outlet temperature < water set temperature + [-8 ° C]
c. [20] minutes since previous Backup heater Off
Heater Stop condition
o
a. Force mode off OR
b. When water outlet temperature > water set temperature + [-2 ° C] for continuous 15 secs
* Do not operate heater at the following situation
1 Water outlet temperature sensor, and water inlet sensor abnormal
2 Flow switch abnormal
3 Circulation pump stop condition
4 During Heatpump switch to tank side
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