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Water Heat Exchanger Unit
Safety precautions
Carefully read the following "Safety Precautions" before beginning installation and wiring work.
The precautions in this document consist of specifi c
related issues that require careful attention.
Their meanings are as described below.
Warnings: Indicates a potentially hazardous situation in which incorrect handling may result in the
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Cautions: Indicates a potentially hazardous situation in which incorrect handling may result in the
Equipment installation and electrical work should be entrusted to the dealer where the product is purchased,
or to a specialist contractor. Incorrect installation performed with inadequate experience can result in
water leakage, electric shock or fi re.
Installation and electrical work should be carried out in accordance with the "Procedures and Technical
Points for System Installation" and "Procedures and Technical Points for Electrical Wiring Work".
Defective installation can result in refrigerant or water leakage, electric shock, or fi re.
The electrical work should be carried out by a properly qualifi ed electrician in accordance with "Technical
Criteria for Electrical Equipment," "Electrical Wiring Regulations," "Procedures and Technical Points for
System Installation," "Procedures and Technical Points for Electrical Wiring Work". Be certain that the
power source specifi cations for gas heat pump air conditioners are satisfi ed, and to provide a dedicated
power circuit.
If the power circuit has insuffi cient capacity, or if there is a defect in the electrical construction, electric
shock or fi re could result.
Use a dedicated branch circuit for the electrical cables, and do not share it with other equipment.
Otherwise, secondary damages may occur as a result of breaker tripping.
Cables should be securely connected using the specifi ed cable type and thickness, with strain-relieved
terminations that protect them from external force on the cables. Improper or insecure connections may
cause overheating and fi re.
If the water heat exchanger unit is installed in an equipment room or similar, the system design must
ensure that a refrigerant leak would not cause the density limit of 0.3 kg/m
with the installation criteria for cooling and air conditioning equipment (S0010) published by the High
Pressure Gas Safety Institute of Japan.
If this limit is exceeded, either provide an opening to an adjoining room, or provide a ventilation system
linked to a gas leak warning device. If the density limit was to be exceeded in the event of a gas leak in
a small room, suffocation of inhabitants could result.
Ensure that the installation location is strong enough to support the weight of the water heat exchanger unit
(and be certain to secure it with anchor bolts). Inadequate strength of the equipment mounting structure
could result in accidents from falling equipment.
Take the appropriate specifi ed measures during installation to protect against strong winds, hurricanes
and earthquakes. A defective installation could result in accidents from falling equipment.
If a refrigerant leak should occur during installation operations, ventilate the area.
If refrigerant gas comes in contact with fl ames from a welding torch, then this could generate poisonous
gas.
After installation of the refrigerant piping is complete, conduct a nitrogen leak test to ensure that there
are no leaks. If refrigerant gas leaks into a room and comes into contact with fan heaters, stoves, etc.,
poisonous gas could be generated.
Do not use the same drain pipe for both the water heat exchanger unit and the indoor units. This could
cause poisoning due to backfl ow of exhaust gas to the indoors.
Do not connect the water heat exchanger unit drain pipe to a gutter in which sulfurous or other toxic gases
may be generated. The toxic gases could leak indoors and cause poisoning.
GHP Chiller TECHNICAL DATA.indb A-19
GHP Chiller TECHNICAL DATA.indb A-19
Safety precautions
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death or serious injury of personnel.
injury of personnel or damage to property.
6. Installation considerations
Warnings and
Cautions. All concern safety-
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Warning
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to be exceeded, in accordance
A-19
2012/04/06 13:42:05
2012/04/06 13:42:05
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