Refrigerant Pipe Connection - mundoclima MUCR 12 HF Manual De Instalación

Air Conditioner DC Duct Type
9. REFRIGERANT PIPE
CONNECTION
Chart 19
Flaring
1. Cut a pipe with a pipe cutter.
2. Insert a flare nut into a pipe and flare
the pipe.
Outside-diameter
(mm)
Ø6.35
Ø9.53
Ø12.7
Ø16
Ø19
Fasten the nuts
Put the connecting tubing at the proper position,
wrench the nuts with hands, then fasten it with a
wrench.( Refer to Chart 21)
Chart 21
CAUTION
Too large torque will harm the bellmouthing
and too small will cause leakage. Please
determine the torque according to Table 2.
Tubing Size
Ø6.35
Ø9.53
Ø12.7
Ø16
Ø19
Table2
Chart 20
A(mm)
Max Min
8.7 8.3
12.4 12.0
15.8 15.4
19.0 18.6
23.3 22.9
Torque
14.4~17.2 N.m
32.7~39.9 N.m
49.5~60.3 N m
61.8~75.4 N m
92.7~118.6 N 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 vacuumpump
(Refer to Chart 22)
(please refer to its manual for the way of using
manifold value)
• Loosen and remove the maintenance nuts of
stop values A and B, and connect the charge hose
of the manifold value with the maintenance
terminator of stop valueA. (Be sure that stop
values A and B are both
closed)
• Connect the joint of
the charge hose with the vacuumpump.
• Open the Lo-lever of the manifold value
completely.
• Turn on the vacuum pump. At the beginning of
pumping, loosen the maintenance terminator nut
of stop valueB 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 value completely and turn off
the vacuum pump.
When you have pumped for over 15 minutes,
please confirm that the indicator of multi-meter is
5
on 1.0x10 Pa(-76cmHg).
• Loosen and remove the quadrangle cover of stop
values Aand Bto open stop value A and B
completely, then fasten them.
• Disassemble the charge hose fromthe repair-
mouth of stop value A, and fasten the nut.
CAUTION
All the stop values should be opened before test
operation. Each air conditioner has two stop
values of different sizes on the side of the outdoor
unit which operate as Lo-stop value and Hi-stop
value, respectively.
8
EN
Chart 22