Outline of Control (Indoor Unit) SiUS281811EA
138 Part 4 Functions and Control
6.10.1 Auxiliary Electric Heater Control
If heating is insufficient in heat pump system alone, an electric heater is to be used as the auxiliary
heater. The following shows the ON/OFF conditions for the electric heater.
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• Heating/Automatic heating
• Auxiliary heater enabled: 1
• Not in heating/Automatic heating
• Auxiliary heater enabled: 0 (∗3)
Heater not allowed
Heater allowed
Heater 1: OFF
Heater 2: OFF
OR
OR
OR
Thermostat OFF/Operation OFF
Heater 1: OFF
Heater 2: OFF
Thermostat OFF
Thermostat ON
Thermostat ON
Condition C
Condition B
Condition B
Thermostat OFF
H/P Heating: In operation
Heater 1: OFF
Heater 2: OFF
Fan: ON
H/P Heating: In operation
Heater 1: ON
Heater 2: OFF
Fan: ON
H/P Heating: In operation
Heater 1: ON
Heater 2: ON
(OFF for single heater)
Fan: ON
H/P In defrost/oil return
Heater 1: ON
Heater 2: OFF
Fan: ON
ENTRY/
5 minutes timer starts.
ENTRY/
5 minutes timer starts.
• Not Condition A
• Thermostat step 2: OFF
• Condition A
• Time up
• Thermostat step 2: ON
Not
Condition A
Not
Condition B
• Thermostat step 3: OFF
• Electric heater capacity setting:
Setting not available
• Thermostat step 3: ON
• Time up
• Electric heater capacity
setting (∗5): Setting available
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