Back-Up Heater Control; Tank Booster Heater Control - Panasonic WH-MXF09D3E8 Service Manual

12.9

Back-Up Heater Control

12.9.1 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. [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
f. When water outlet temperature < Water set temperature + [-8°C] (check water out temperature
before ON heater 3 and check also water out temperature after heater delay timer before ON heater
2 and 1)
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. Heat pump 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

12.10 Tank Booster Heater Control

12.10.1 Tank Booster Heater Control
Heating operation condition:
1 Booster heater Turn On condition:
After BOOSTER HEATER DELAY TIMER fulfill during heat pump startup time in tank mode, or during
o
switching from heating heat-up interval to tank heat-up interval in heat + tank mode (heating priority not
set).
Tank temperature < Tank set temperature + [-7°C],
o
20 minutes since previous heater off.
o
* BOOSTER HEATER DELAY TIMER is clear when tank heat-up interval end.
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