Panasonic (WH-UD12CE5-A-1, Service Manual

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13.9 Indoor Back-Up Heater Control
13.9.1 Indoor Electric Heater Control
1 Normal Heating Mode
o
Heater On condition:
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 tempe [-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)
o
Heater Stop Condition:
a. When outdoor set temperature > outdoor set tempe [+2 ° C] for continuous 15 secs OR
b. When water out temp> water set tempe [-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
o
Heater On Condition:
a. After water pump operate [9] mins
b. When water outlet temperature < water set tempe [-8 ° C]
c. [20] minutes since previous Backup heater Off
o
Heater Stop condition
a. Force mode off OR
b. When water outlet temperature > water set tempe [-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
13.10 Tank Booster Heater Control
13.10.1 Tank Booster Heater Control
Heating operation condition:
1 Booster heater Turn On condition:
o
After BOOSTER HEATER DELAY TIMER fulfill during heat pump startup time in tank mode, or during
switching from heating heat-up interval to tank heat-up interval in heat + tank mode (heating priority not
set).
o
Tank temperature < tank set tempe [-5°C] ,
o
20 minutes since previous heater off.
* BOOSTER HEATER DELAY TIMER is clear when tank heat-up interval end.