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4.6 Heat Insulation Treatment for Gas-Liquid Piping Connections
for the Indoor Unit
The heat insulation treatment is carried out on the piping at the gas and
liquid sides of the indoor unit respectively.
a. The piping on the gas side must use heat insulation material that can
withstand temperatures of 120°C and more.
b. For the piping connections of the indoor unit, use the insulation casing
for copper pipes to carry out the insulation treatment, and close all
gaps.
Unit body
4.7 Vacuum
Create a vacuum in the system according to the instructions in the
installation manual of the outdoor unit.
Caution
• For the vacuum, make sure that the air and liquid cut-off valves of the
outdoor unit are all closed (maintain the factory status).
4.8 Refrigerant
Charge the system with refrigerant according to the instructions in the
installation manual of the outdoor unit.
5. Water Discharge Piping and Connecting Piping
Installation
5.1 Installation of the Water Discharge Piping for Indoor Unit
Tilt the water discharge pipe downwards. Make sure the following situations
do not arise when the water discharge pipes are being installed:
No section of the water discharge
piping should be pointing up.
Figure 5.1
When connecting to a long water discharge pipe, the indoor unit portion
must be covered with insulation casing. Make sure the long pipe does
not become loose.
Protection piping
Water discharge pipe
Figure 5.2
5.2 Installation of the Connecting Piping for Indoor Unit
Left connection
pipe
Rear connection
pipe (left)
Rear connection
pipe (right)
Figure 5.3
Face upwards
On-site piping side
Attached insulation heat pump belt
Figure 4.4
The tail end of the water discharge
piping should not be placed into water.
Wall
Extended water discharge pipe
Right connection
pipe
Use the following operations to join the left connection pipe and the rear
connection pipe (left). Bend the connecting pipe, and place it at a maximum
of 43 mm from the wall.
Outline of indoor unit
Figure 5.4
Secure the tail-ends of the connecting pipes (refer to the portion on
fixing and securing the connections in connecting the refrigeration
piping).
Caution
• First install the indoor unit. Then install the outdoor unit. Be careful of
bends and adjust the pipeline accordingly.
• Do not expose the pipeline at the back of the indoor unit.
• Make sure the water discharge pipes are not loose and moving.
• Make sure all the connections in the piping system are properly
sealed to prevent water leakages.
5.3 Binding the Pipes:
1)
Bind in the following sequence: power cord and signal line on top,
connecting pipe in the middle, and water piping below.
2)
Confirm where the water outlet is before you connect the water
discharge pipe.
3)
Do not pull the snake tube hard during the binding process.
4)
Cover the insulation materials if the pipes are pulled out horizontally.
5)
Avoid the connection joints during binding to in preparation of leakage
checks.
6)
When the water discharge pipe is not long enough, and there is a need
to extend the water discharge pipe, make sure that protecting casing is
used to wrap the indoor portion for the extended pipe. Make sure the
water piping is not coiled anywhere.
5.4 Water Discharge Test
Once the water discharge piping is installed, inject a small amount of water
into the water pan to check if the drainage is smooth.
Caution
• The condensed water in the rear of the indoor unit is gathered in the
water pan and discharged from the piping. Do not place anything in
the water pan.
IDU
Connecting
electrical cable
Water discharge pipe
5
Connecting pipe
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Water sink
Where pipes are hidden
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Connecting piping
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Binding tie
Figure 5.5
V.1
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