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Introduction
Safety Precautions
The following is an important safety notice you must follow in order to prevent injuries and/or damages that may be
caused by incorrect operation in repair, inspection and maintenance of the Gas Heat Pump. Be sure to read these
precations carefully and follow the instructions.
Definition of " " and " "
Inspection Precautions
Precautions of Electrical Parts Inspection
Indicates a potentially hazardous situation that could result in death or serious injury by misuse.
If the items with this symbol shown in this manual are not adhered to, injury or damage to the unit could occur.
[Before starting inspection]
1. Be sure to switch OFF the electric leakage breaker in the outdoor control box.
If not, you could be shocked.
※ If not, you could be injured because the fans may automatically start temporarily to protect the units
or maintain performance even if the GHP is stopped.
2. Close the fuel valve.
If not, gas poisoning or gas explosion could occur.
[During inspection]
1. Check for fuel gas leakage. If there is anything unusual such as gas odor, be sure to take proper safety
measures.
If not, gas poisoning or gas explosion could occur.
2. Be sure to disconnect the igniter connector before conducting corrective measures against carbon deposit
formation on the valve or valve seat.
If not, fire could occur when cranking.
1. Do not touch the engine pulley or compressor belts when the [RUN] switch is ON.
If not, injury could result.
[Before starting inspection]
1. Be sure to turn OFF the overcurrent breaker in the junction circuit and the electric leakage breaker in the
outdoor control box, and confirm the residual voltage is lower than specified value.
If not, you could be shocked, burned, or injured and the equipment could be damaged.
[Procedure of safety check before starting inspection]
1. Confirm more than 1 minute has elapsed after turning OFF the electrical leakage breaker (to allow residual
voltage to self-discharge).
2. Confirm the voltage between the following terminals is lower than 15 V DC with a voltmeter (such as circuit
tester).
between the terminal ① (red) and ③ (black) of CN2 on the power PCB, or
between the terminal ① (red) and ③ (black) of CN4 on the DCBL PCB.
High voltage (residual voltage higher than 250 V DC) is still charged in the electrolytic capacitor on the
DCBL PCB at the bottom of the outdoor control box even after turning OFF the electric leakage breaker.
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