Selection Of Installation; Before Installation; Electrical Wiring - Toshiba HWS-802H-E Installations-Handbuch

Air to Water Heat Pump
4

SELECTION OF INSTALLATION

Before installation

Be careful to the following items before installation.
Length of refrigerant pipe
Length of refrigerant
pipe connected to hydro/
outdoor unit
3 m to 30 m
* Do not connect a refrigerant pipe shorter than 3 m.
This may cause a malfunction of the compressor or
other devices.
Airtight test
1. Before starting an airtight test, further tighten the
spindle valves on the gas side and liquid side.
2. Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 Mpa) to
conduct the airtight test.
3. After the airtight test is completed, evacuate the
nitrogen gas.
Air purge
• For air purge, use a vacuum pump.
• Do not use refrigerant charged in the outdoor unit for
air purge. (The refrigerant for air purge is not
contained in the outdoor unit.)

Electrical wiring

Be sure to fix the power wires and hydro/outdoor
connecting wires with clamps so that they do not
contact with the cabinet, etc.
Item
Addition of refrigerant is
unnecessary at the local site.
Outdoor Unit Installation Manual
Earthing
Make sure that proper earthing is provided.
Improper earthing may cause electric shock. For how
to check earthing, contact the dealer who installed the
Air to Water Heat Pump or a professional installation
company.
• Proper earthing can prevent charging of electricity on
the outdoor unit surface due to high frequency of the
frequency converter (inverter) in the outdoor unit, as
well as prevent electric shock. If the outdoor unit is
not properly earthed, you may feel electric shock.
• Be sure to connect earth wire. (grounding work)
Incomplete grounding cause an electric shock.
Do not connect ground wires to gas pipes, water
pipes, lightning rods or ground wires for telephone
wires.
Test Run
• Start test run when the water piping work is
completed and the system is filled with the proper
amount of water.
• Turn on the leakage breaker at least 12 hours before
starting a test run to protect the compressor during
startup.
Incorrect work may result in a malfunction or
complaints of customers.
– 7 –
WARNING
CAUTION
EN
6-EN