Heater Control (Fxtq) - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Outline of Control (Indoor Unit)

9.10 Heater Control (FXTQ)

9.10.1 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 OFF
Heat Pump: Fan normal operation
Condition A
Continues for 5 minutes
Electrical heater step setting 01
Thermostat step 3 = "ON"
Continues for 5 minutes
Thermostat step 4 = "ON"
Continues for 5 minutes
76
• Thermostat OFF
• Stop operation
Thermostat step 1
Heater 1 ON
Heater 2 OFF
Fan H tap ∗1
Thermostat step 3 = "OFF"
Heater 1 ON
Heater 2 ON
Fan H tap ∗1
Thermostat step 4 = "OFF"
Heater 1 ON
Heater 2 ON
Fan H tap ∗1
Fan H tap
120 seconds ∗2
Fan H tap
120 seconds ∗2
Elimination of Condition A
Timer clear
Elimination of Condition A
Timer clear
Elimination of Condition A
SiUS30-1301
Timer clear
Function and Control