Daikin VRV IV-S RXTQ-TAVJU Series Service Manual page 81

SiUS331604E
6.11.2 Heat Pump Lockout Mode
During heating operation, users can select an electrical heater for heating. For this, signals are sent
using ABC terminal of outdoor unit PCB.
When the hot-water heating signal is received from the outdoor unit PCB, heating operation is
performed only with the heater as manual backup operation. The ON/OFF conditions for this
electrical heater are shown below.
Thermostat OFF/Stop operation
Thermostat ON
Condition A
Timer count: 5 minutes
Electrical heater step setting 01
Thermostat step 2 = "ON"
Timer count: 5 minutes
Thermostat step 3 = "ON"
Timer count: 5 minutes
Functions and Control
• Thermostat OFF
• Stop operation
Thermostat step 1 H/P
Fan: Normal 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)
Fan H tap
120 seconds (∗3)
Fan H tap
120 seconds (∗3)
Timer clear
Thermostat step 2 = "OFF"
Timer clear
Thermostat step 3 = "OFF"
Outline of Control (Indoor Unit)
Timer clear
Condition B
Condition B
Condition B
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