-87-
Design & installation Guide For McQuay MDS Multi System
4.3.8 Air Leak Gap Checking
Test 1 (when the pressure reduces)
Hearing use your ear to find it out.
Touching use your hand to find it out.
Soap water use soap water to find it out.
Test 2 (when step 1 can not find out , then the following should be adopted)
Reduce nitrogen pressure to 3.0kg/cm
2
;
Charge the nitrogen with R22 to 5.0kg/cm
2
;
Use haloid lamp, alkyl detector or electric controller to check;
If still can not find the air leak gap, then the pressure should be charged to 28.0kg/cm
2
and
check it again;
(The pressure can not be more than 28.0kg/cm
2
).
Notes: If the pipe is too long, it should be divided to sections to test as follows:
Indoor side
Indoor side + vertical pipes
Indoor side + vertical pipes + outdoor piping assembly
ABCD
NO.1 NO.2
Outdoor unit
Valve
Indoor unit
Vacuum pump
Refrigerant
Gauge
Nitrogen bottle
4.3.9 Copper Pipe Insulation
Material
All the insulation material should be strong enough to insulate the pipe.
For example, polyethylene is a good insulation material.
key points
Some areas such as welding area, enlarged port area and flange area can be insulated only after
the air leak test. Pay attention to the unit model and the running condition, for some gas pipe and
liquid pipe are all needed to be insulated.
pipe insulation
Refrigerant piping
assembly
pipe insulation
air leak test
To Next Page
Loading...
Need help?
General
