Advertisement
Available languages
Available languages
PIPING WORK AND REFRIGERANT CHARGE
For heat pump systems (2 pipes)
For piping from bottom base
Control wiring
Transmission wiring
Power source wiring
Seal gaps with packings (field-supplied).
Install accessory rubber bushes to the
8.3.6 Stop valve
Follow the restrictions for refrigerant piping (permissible length,
height difference). If not, the outdoor unit may be damaged or
fail.
The stop valves shall be closed completely (factory setting)
when the refrigerant piping connection is performed. Do not
open the stop valves until all the refrigerant piping connections,
air-tight test and vacuuming have been completed.
Gas valve
1 Make sure that all the spindles are closed completely.
2 Connect the charging hose to the service port and release
the gas inside the piping from the high/low and low pressure
gas pipes.
3 Cut the end of the closing pipes and check that no gas exists
inside the high/low and low pressure gas pipes.
4 Remove the stop valve cover.
5 Remove the closing pipe from the brazing portion with a
burner. Pay attention to the flame from the burner not to burn
the stop valve body.
Service port
Stop valve
for liquid
valve
Cutting portion
(Ø6.35 pipe)
Cut here
23
PMML0479 rev.4 - 11/2018
Liquid pipe
Gas pipe
Front side
wiring outlets.
Stop valve for gas
valve (high/low
pressure)
Stop valve for gas
valve (low pressure)
Stop valve
cover (Read the
precautions)
End of closing pipe (Ø6.35)
Closing pipe
For heat recovery systems (3 pipes)
For piping from bottom base
Control wiring
Transmission wiring
Power source wiring
Seal gaps with packings (field-supplied)
Install accessory rubber bushes to the wiring outlets
?
n o t e
•
After removing the pipes and completing insulation work, cover the
gap between the base and the pipes with packing (field-supplied). If
the gap is not covered, the unit may be damaged if snow, rain water
or animals enter the unit.
•
Fix the rubber bushes with adhesive when conduit tubes to the
outdoor unit are not used.
Heat exchanger fin
Heat exchanger
Metal plate
for protection
Closing pipe
!
C a U t i o n
•
Ensure that there is no gas inside the pipe when removing the closing
pipe. Otherwise, the pipe may be blown out and it may lead to injury.
•
Protect the return oil pipe and vibration proof of the compressor with
a metal plate when using a burner.
Liquid valve
Tighten the flare nut for liquid stop valve according to the
following torque. If an excessive force is applied to the flare nut,
the refrigerant leakage may occur from the spindle part.
(Put two spanners as shown in the right figure when the piping
is removed and attached. If not, the refrigerant leakage may
occur.)
Do not put two spanners here.
Refrigerant leakage may occur.
Two spanners work
Liquid pipe
High/Low pressure gas pipe
Low pressure gas pipe
Front side
Stop valve for liquid valve
Stop valve for gas pipe (body)
(high/low pressure)
Stop valve for gas pipe (body)
(low pressure)
Field-work side
Valve stay
Torch
Tightening work for stop valve (liquid)
Advertisement
