Daikin VRV RXYQ72-384XAYCA Service Manual page 201

SiUS342004EB
2.5.5 Heat Pump Lockout
New control logic to provide more application options for cold climates.
Outside temperature can now be measured directly from the outdoor unit coil sensor.
This field setting can switch automatically to emergency heat if there is a system fault.
Heat pump
lockout
temperature
Heat pump
lockout release
differential
[2-16]:
[2-37]:
Type
l —
Mode 1
Mode 2
(for a heater which
does not need airflow)
Mode 3
ll
Mode 4
Mode 5
Mode 6
Part 5 Field Settings and Test Operation
Item
Below this temperature, heat pump is
locked out.
When the outdoor air temperature is
recovered by this temperature, heat
pump is resumed.
Auxiliary heater setting (Type I)
Value
[2-16]
0 (default)
1
Auxiliary heater setting (Type II)
Value
[2-37]
0 (default)
1
2
3
4
5
6
Description
setting
Heat pump heating is
2-16: ON
always locked out
Lockout is controlled by
ABC terminals
Mode 1
Mode 2
Lockout is controlled by
the outdoor air Mode 3
temperature and
setpoint which is
Mode 4
configured by the field
setting [2-78] and [2-79]
Mode 5
Mode 6
Description
Auxiliary heater
OFF
ON
Controlling mode
OFF
Mode 1
Mode 2
Mode 3
Mode 4
Mode 5
Mode 6
Heating thermostat
Field Shorted
between
Auxiliary
heater
— ON
A-C
2-37:
B-C
ON
A-C
2-37:
B-C
2-37:
Same as 2-37: Mode 1, A-C shorted
2-37:
Same as 2-37: Mode 1, B-C shorted
2-37:
Same as 2-37: Mode 2, A-C shorted
2-37:
Same as 2-37: Mode 2, B-C shorted
Field Settings for Outdoor Unit
Min Max
–15°F
50°F
(–26.1°C)
(10°C)
(default)
5°F, 10°F (default), 15°F
(2.8°C, 5.6°C (default), 8.3°C)
Actions
Heating thermostat
ON
Auxiliary
Indoor fan
heater
ON (H/L) OFF
ON (H/L)
OFF
LL
Increments
5°F
(2.8°C)
OFF
Indoor fan
LL
LL
OFF
LL
OFF
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