Indoor Back-Up Heater Control - Panasonic WH-MXC09J3E5 Service Manual

14.6 Indoor Back-Up Heater Control

14.6.1 Indoor Electric Heater Control
1 Normal Heating Mode
Heater On condition:
o
a. Heater switch is ON
b. After Heatpump thermo ON for [Remote Control Set Delay Time] mins
c. After water pump operate [1] min
d. Outdoor air temperature < Outdoor set temperature for heater
e. When water outlet temperature < Water set temperature + [Remote Control Heater ON Setting]
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 + [Remote Control Heater OFF Setting] 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 [2] mins
b. When water outlet temperature < water set temperature + [Remote Control Heater ON Setting]
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 + [Remote Control Heater OFF Setting] 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
14.6.2 Room Heater Operation during Deice
Purpose:

To protect the indoor Heat Exchanger from ice forming and prevent heat exchanger plate breakage.
Control content:

This Heater protection control will activate only if the backup heater is enable at custom setup by remote
controller. Once fulfil the start condition, room heater will turn ON together (base on max heater capacity
selection) and stop together if stop condition is fulfilled.
* If the heater is request to turn ON OLP feedback will be detected.
Starting conditions:

During normal deice operation 4~9

Water outlet temperature < 7°C

Water Flow rate < 20L/min

Water outlet temperature < 10°C or
Outdoor air temperature < -30°C or
Water inlet temperature < 10°C
Heater operates when 1 ~2 fulfilled OR When 1 and 3 ~ 4 is fulfilled.
However, this control does not relate to Heater ON/OFF button on remote control.
Stop condition:

When normal deice end or

Water outlet temperature > 45°C
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