Outline of Control (Indoor Unit)
SiUS281117
Function and Control
59
6.8
Heater Control (FTQ)
6.8.1 Auxiliary Heater Control
If heating is insufficient in heat pump system alone, an electrical heater is to be used as the
auxiliary heater. The following shows the ON/OFF conditions for the electric heater.
Thermostat OFF/Stop operation
Thermostat step 1
Heat Pump: Fan normal operation
Continues for 5 minutes
Continues for 5 minutes
Continues for 5 minutes
Timer clear
Timer clear
Timer clear
Fan H tap
120 seconds
∗
2
Fan H tap
120 seconds
∗
2
Thermostat OFF
Condition A
Electrical heater step setting 01
Thermostat step 3 = "ON"
Thermostat step 4 = "ON"
Elimination of Condition A
Elimination of Condition A
Elimination of Condition A
Thermostat step 3 = "OFF"
Thermostat step 4 = "OFF"
• Thermostat OFF
• Stop operation
Heater 1 ON
Heater 2 OFF
Fan H tap
∗
1
Heater 1 ON
Heater 2 ON
Fan H tap
∗
1
Heater 1 ON
Heater 2 ON
Fan H tap
∗
1
