Heater Control (Fxtq) - Daikin VRV IV-S RXTQ-TAVJU Series Service Manual

Outline of Control (Indoor Unit)

6.11 Heater Control (FXTQ)

6.11.1 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
∗1. Fixing of the fan H tap.
Note:
∗2. The heater backup prohibiting conditions are prioritized. Even when the heater ON conditions
67
• 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)
are met, the heater is turned OFF when the prohibiting conditions are met.
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
SiUS331604E
Timer clear
Functions and Control