Daikin VRV RXYQ72-384XAYCA, Service Manual

Page: 134 / 419

Outline of Control (Indoor Unit) SiUS342004EB
127 Part 4 Functions and Control
Note(s)
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.
Thermostat OFF/Operation OFF
ENTRY/
5 min u tes timer starts.
• Condition A
• Time
u p (
∗
2)
&
H/P Heating: Not in operation
Heater 1: ON
Heater 2: OFF
Fan: ON
ENTRY/
5 min u tes timer starts.
&
OR
• Thermostat step 2: OFF
H/P Heating: Not in operation
Heater 1: ON
Heater 2: ON
(OFF for single heater)
Fan: ON
• Electric heater capacity setting:
Setting not a v aila b le
• Thermostat step 2: ON
• Time
u p
• Electric heater capacity
setting: Setting a v aila b le
Not Condition A
Not Condition A
&
Condition A
OR
Condition B: Heater b ack u p prohi b iting conditions (
∗
1)
•
Heating or a u tomatic heating mode
•
Thermostat step 1: ON
•
No fan motor system error
•
Hot-water heater: 1 (ON)
•
Heater b ack u p prohi b iting conditions (
∗
1) not met
(Not Condition B)
•
Indoor u nit error (A b normal stop)
•
Indoor u nit error (Remote controller thermistor error)
•
Indoor u nit error (Remote sensor error)
•
Electric heater capacity setting: 01 (No heater kit)
 1. The heater backup prohibiting conditions are prioritized. Even when the heater ON
conditions are met, the heater is turned OFF when the prohibiting conditions are met.

2. When the remote controller is ON, Time-up will be set to the initial value.