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22
AIR PURGING
Air and moisture remaining in the refrigerant system may create
adverse conditions as indicated below:
• pressure in the system rises.
• operating current rises.
• cooling efficiency drops.
• moisture in the refrigerant circuit may freeze and block capil
-
lary tubing.
• water may lead to corrosion of parts in the refrigerant system.
Therefore, the indoor unit and tubing between the indoor and
outdoor unit must be evacuated to remove moisture from the system.
AIR PURGING WITH VACUUM PUMP (TEST RUN)
Confirm each tube (narrow and wide tubes) between the indoor
and outdoor units has been properly connected and all wiring
for the test run has been completed. Remove the valve caps
from the wide and narrow service valves on the outdoor unit.
Note that both narrow and wide tube service valves on the out-
door unit are kept closed at this stage (shipping position).
Leak Test
1. With the service valves on the outdoor unit remaining closed,
remove the threaded cover on the wide tube service port.
(Save for reuse.)
2. Attach a manifold valve (with pressure gauge) and dry nitro-
gen gas cylinder to this service port with charge hoses.
CAUTION:
Be sure to use a manifold valve for air purging. If it is not avail
-
able, use a stop valve for this purpose. The “Hi” knob of the
manifold valve must always be kept closed.
3. Pressurize the system to no more than 150 P.S.I.G. with dry
nitrogen gas and close the cylinder valve when the gauge
reading reaches 150 P.S.I.G. Next, test for leaks with liquid
soap.
Lo
Hi
Pressure
Gauge
Manifold Valve
Outdoor Unit
Indoor Unit
Charge Hose
Nitrogen Gas
Cylinder
(Vertical
Position)
Summary of Contents for DMB-1822LH
Page 8: ...8 DMB 2122LH unit A 12000BTU h ...
Page 41: ...41 6 WIRING DIAGRAM DMB 1822 1832LH ...
Page 43: ...43 DMB 2112 2122LH ...
Page 54: ...DMB 1822 2112 2122LH O utdoor 10 PC B DRIVING DESC RIPTION 1 P CB CI R CU I T D I A G R A M ...
Page 55: ......
Page 56: ...DMB 1822 2112 2122LH 9K indoor ...
Page 57: ......
Page 58: ...DMB 2112 2122LH 12K indoor ...
Page 59: ......
Page 82: ...79 6 U9 KIA7042P RESET IC KIA70 42P OUTLINE INPUT GROUND OUTPUT VCC 1 3 2 OUT GND ...
Page 87: ...84 3 EX P LO D ED D I A G R A M I n d o o r U n it DMB 1822LH DMB 2112 2122LH unit B 9K ...
Page 89: ...86 DMB 2112LH unit A 12K ...
Page 92: ...89 DMB 2122LH unit A ...
Page 95: ...92 4 EXPLODED DIAGRAM Outdoor Unit DMB 1822 1832LH 5 ...
Page 97: ...DMB 2112 2122LH 94 ...
Page 99: ...96 5 CONTROL BOX ASSEMBLY DMB 1822 1832LH DMB 2112 2122LH unit B 9K L N ...
Page 101: ...98 DMB 2112LH unit A 12K ...
Page 103: ...100 DSB 2122LH unit A 12K ...
Page 105: ...102 6 CONTROL PANEL ASSEMBLY 7 j ...