mundoclima MVD D4+ Installation Manual page 8

Installation manual
9.2 Check The Leakage
Check all the joints with the leak detector or soap water. (See
Fig.9-6 as a reference illustration)
Check-point of indoor unit
Check-point of outdoor unit
A. Lo-stop valve
C,D. Joints of the connecting pipe to the indoor unit.
9.3 Insulation
Be sure to with insulating materials cover all the exposed parts
of the flare pipe joints and refrigerant pipe on the liquid-side and
the gas-side. Ensure that there is no gap between them.
Incomplete insulation may cause water condensation.
Table.9-1
Outside diameter
Φ6.4mm
Φ9.5mm
Φ12.7mm
Φ15.9mm
Φ19.1mm
Table.9-2
Tubing size
Φ6.4mm
Φ9.5mm
Φ12.7mm
Φ15.9mm
Φ19.1mm
Fasten the nut
●
Put the connecting tubing at the proper position, wrench the
nuts with hands then fasten it with a wrench. (Refer to
Fig.9-4
●
Too large torque will harm the bellmouthing and too small will
cause leakage. Please determine the torque according to
Table.9-2.
D
C
B A
B. Hi-stop valve
Fig.9-2
Fig.9-3
A(mm)
Max Min
8.7 8.3
12.4 12.0
15.8 15.4
19.0 18.6
23.3 22.9
Fig.9-4
Torque
14.4~17.2N.m
32.7~39.9N.m
49.5~60.3N.m
61.8~75.4N.m
92.7~118.6N.m
The necessary filling amount of refrigerant
●
Refrigerant volume to be added is calculated according to
outdoor unit installation manual .Be sure to add refrigerant
measuring by a scale. L: The length of the pipe
●
Please record the quantity added and store it carefully for
future maintenance.
Expel the air with a vacuum pump (Refer to Fig.9-4) (Please
refer to its manual for the way of using manifold valve)
●
Loosen and remove the maintenance nuts of stop valves A
and B, and connect the charge hose of the manifold valve
with the maintenance terminator of stop valve A. (Be sure
that stop valves A and B are both closed)
Connect the joint of the charge hose with the vacuum pump.
●
●
Open the Lo-lever of the manifold valve completely.
●
Turn on the vacuum pump. At the beginning of pumping,
loosen the maintenance terminator nut of stop valve B a little
to check whether the air comes in (the sound of the pump
changes, and the indicator of compound meter turns below
zero). Then fasten the nut.
● When the pumping has finished, close the Lo-lever of the
manifold valve completely and turn off the vacuum pump.
●
When you have pumped for over 15 minutes, please confirm
that the indicator of multimeter is on -1.0X105Pa (-76cmHg)
● Loosen and remove the quadrangle cover of stop valves A
and B to open stop valve A and B completely, then fasten
them.
●
Disassemble the charge hose from the repair-mouth of stop
valve A, and fasten the nut.
Multi-meter
-76 cmHg
Lo-lever
Charge hose
All the stop valves should be opened before test operation.
Each air conditioner has two stop valves of different sizes on
the side of the outdoor unit which operate as Lo-stop value, respec-
tively. (Refer to Fig.9-6)
Valve body
Valve stem
7
High pressure duct D4+
Manifold valve
Pressure meter
Hi-lever
Charge hose
Fig.9-5
Vacuum pump
Lo-lever
Flare nut
Stopper
Cap
Fig.9-6