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27
Installation and Maintenance
Service Manual
Vacuum pump
Vacuum pump Vacuum pump
conversion joint
Connect to the
indoor unit
INDOOR
UNIT
Refrigerant fluid di
rection of fiow
3-way valve
inlet
2-w
ay valve
(8) Secure
(2)Turn
(7)Turn to open fully
(8) Secure
(2)Turn
(6) Open by 1/4 turn
(7)Turn to open fully
(8) Secure
(2)Turn
Valve cap
V
alve cap
Service
BLEEDING
Humid air left inside the refrigerant circuit can cause compressor
malfunction. After having connected the indoor and outdoor units,
bleed the air and humidity from the refrigerant circuit using a
vacuum pump.
(1) Unscrew and remove the caps from the 2-way and 3-way
valves.
(2) Unscrew and remove the cap from the service valve.
(3) Connect the vacuum pump hose to the service valve.
(4) Operate the vacuum pump for 10-15 minutes until an absolute
vacuum of 10 mm Hg has been reached.
(5) With the vacuum pump still in operation, close the low-pressure
knob on the vacuum pump coupling.Stop the vacuum pump.
(6) Open the 2-way valve by 1/4 turn and then close it after 10
seconds. Check all the joints for leaks using liquid soap or an
electronic leak device.
(7) Turn the body of the 2-way and 3-way valves. Disconnect the
vacuum pump hose.
(8) Replace and tighten all the caps on the valves.
Diameter (in) Twisting moment (N.m)
1/4
15-20
3/8
35-40
1/2 45-50
5/8 60-65
3/4 70-75
18/24/36/42K unit need to be installed the indoor unit
MAINTENANCE
Use suitable instruments for the refrigerant R410A.
● Do not use any other refrigerant than R410A.
Do not use mineral oils to clean the unit.
INSTALLATION DIMENSION DIAGRAM
The installation must be done by trained and qualied service
personnel with reliability according to this
manual.
Contact service center before installation to avoid the
malfunction due to unprofessional installation.
When picking up and moving the units, you must be guidedby
trained and qualied person.
appliance.
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Ensure that the recommened space is left around
the
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MULTIU18HP230V1DO
Space to the cover
200cm
30cm
(Air inlet side)
or abov
e
50cm
or
S
above
e
(Air outlet side)
pace to th
or above
wall
or more
30cm
or above
Space to the cover
50c
m
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