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INSTALLATION MANUAL FOR OUTDOOR UNIT
26
(2) Wiring connection
6. Test run
WARNING
Make wiring to supply power to the outdoor unit, so that the power for the indoor unit is supplied by
* and * terminals.
DO NOT CONNECT THE NEUTRAL WIRE TO , OR PHASE. INTERCONNECT-
ING WIRES MUST BE WIRED WITH SAME SYMBOLS ON THE TERMINALS OF BOTH
INDOOR AND OUTDOOR UNIT.INCORRECT WIRING CAUSE EQUIPMENT DAMAGE OR
A FIRE.
N R S
T
(3) Wiring procedure
1) Remove set screws on the side before taking off the front panel toward the direction shown in
figure.
2) Connect wires to the terminal block correctly and fix the wires with a wire clamp equipped near
by the terminal block.
3) Route the wires in a proper way and penetrate the wires through the opening for electric wiring
on the side panel.
Front panel
Opening for
electric wiring
(1) Before starting test run (for all Heat pump models)
Confirm whether the power source breaker (main switch) of the unit has been turned on for over 12
hrs to energize the crankcase heater in advance of operation.
(2) Test run
Run the unit continuously for about 30 minutes, and check the following.
Suction pressure at check joint of service valve for gas pipe.
Discharge pressure at check joint on the compressor discharge pipe.
Temperature difference between return air and supply air for indoor unit.
CAUTION
THIS UNIT WILL BE STARTED INSTANTLY WITHOUT "ON" OPERATION WHEN ELECTRIC
POWER IS SUPPLIED.
BE SURE TO EXECUTE "OFF" OPERATION BEFORE ELECTRIC POWER IS DISCONNECTED
FOR SERVICING.
This unit has a function of automatic restart system after recovering power stoppage.
1
TB1
1
2
3
TB2
1
2
3
TB
L
N
Outdoor
unit
Circuit breaker
Earth leakage
breaker
Indoor
unit
HIGH VOLTAGE
Interconnecting
wires
Interconnecting
wires
2
TB1
1
2
3
TB2
1
2
3
TB
R
S
T
N
Outdoor
unit
Circuit breaker
Earth leakage
breaker
Indoor
unit
HIGH VOLTAGE
HDU-24H03/H
HDU-28H03/H
HDU-42H03/H