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13.9
Indoor Back-Up Heater Control
13.9.1 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
13.10 Tank Booster Heater Control
13.10.1 Tank Booster Heater Control
Heating operation condition:
1
Booster heater Turn On condition:
After BOOSTER HEATER DELAY TIMER fulfil during heatpump 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 + [-5°C],
o
20 minutes since previous heater off.
o
* BOOSTER HEATER DELAY TIMER is clear when tank heat-up interval end.
85
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