Daikin VRV EMERION REYQ-AATJA Service Manual page 206

Outline of Control (Indoor Unit)
9.12.2 Heat Pump Lockout Control
For heating operation, users can select to use electric heater. 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 electric heater as manual backup operation. The ON/OFF conditions for
the electric heater are shown below.
&
Note(s)
1. The heater backup prohibiting conditions are prioritized. Even when the heater ON
2. When the remote controller is ON, Time-up will be set to the initial value.
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Thermostat OFF/Operation OFF
ENTRY/
5 minutes timer starts.
H/P Heating: Not in operation
Heater 1: ON
Heater 2: OFF
Fan: ON
ENTRY/
5 minutes timer starts.
• Thermostat step 2: ON
• Time up
• Electric heater capacity
setting: Setting available
H/P Heating: Not in operation
Heater 1: ON
Heater 2: ON
(OFF for single heater)
Fan: ON
Condition A
• Heating or automatic heating mode
• Thermostat step 1: ON
• No fan motor system error
&
• Hot-water heater: 1 (ON)
• Heater backup prohibiting conditions (∗1) not met
(Not Condition B)
Condition B: Heater backup prohibiting conditions (∗1)
• Indoor unit error (Abnormal stop)
• Indoor unit error (Remote controller thermistor error)
OR
• Indoor unit error (Remote sensor error)
• Electric heater capacity setting: 01 (No heater kit)
conditions are met, the heater is turned OFF when the prohibiting conditions are met.
• Condition A
&
• Time up (∗2)
• Thermostat step 2: OFF
• Electric heater capacity setting:
OR
Setting not available
SiUS372201EB
Not Condition A
Not Condition A
Part 4 Functions and Control