Installation Conditions; Refrigerant Piping; Electrical Wiring; Before Installation - Toshiba HWS-P804HR-E Instruction Manual

Air to Water Heat Pump
 Refrigerant piping
Refrigerant (R410A)
When using the conventional piping kit
• When using the conventional piping kit with no
indication of applicable refrigerant types, be sure to
use it with a wall thickness of 0.8 mm for Ø6.4 mm,
Ø9.5 mm, and Ø12.7 mm, and with a wall thickness
of 1.0 mm for Ø15.9 mm. Do not use the
conventional piping kit with a wall thickness less than
these thicknesses due to insufficient pressure
capacity.
When using general copper pipes
• Use general copper pipes with a wall thickness of 0.8
mm for Ø6.4 mm, Ø9.5 mm, and Ø12.7 mm, and with
a wall thickness of 1.0 mm for Ø15.9 mm.
Do not use any copper pipes with a wall thickness
less than these thicknesses.
Flare nuts and flare machining
• The flare nuts and flare machining are different from
those for the conventional refrigerant.
Use the flare nuts supplied with the air to water heat
pump or those for R410A.
• Before performing flare machining, carefully read

"Refrigerant piping".

4
Installation
conditions
 Before installation
Be sure to prepare to the following items before
installation.
Length of refrigerant pipe
Length of refrigerant pipe
connected to indoor /
outdoor unit
5 to 30 m
• Do not connect a refrigerant pipe that is shorter than
5 m.
This may cause a malfunction of the compressor or
other devices.
9-EN
Item
Addition of refrigerant is
unnecessary at the local site.
 Airtight test
1. Before starting an airtight test, further tighten the
spindle valves on the gas and liquid sides.
2. Pressurize the pipe with nitrogen gas charged from
the service port to the design pressure (4.15 MPa) to
conduct an airtight test.
3. After the airtight test is completed, evacuate the
nitrogen gas.
Air purge
• To purge air, use a vacuum pump.
• Do not use refrigerant charged in the outdoor unit to
purge air. (The air purge refrigerant 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
come into contact with the cabinet, etc.
Earthing
• Proper earthing can prevent charging of electricity on
the outdoor unit surface due to the presence of a
high frequency in the frequency converter (inverter)
of the outdoor unit, as well as prevent electric shock.
If the outdoor unit is not properly earthed, you may
be exposed to an electric shock.
• Be sure to connect the earth wire. (grounding
work)
Incomplete earthing can cause an electric shock.
Do not connect earth wires to gas pipes, water pipes,
lightning rods or earth wires for telephone wires.
Test run
Turn on the leakage breaker at least 12 hours before
starting a test run to protect the compressor during
startup.
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Installation Manual