3.12 System Evacuation
A properly maintained two stage vacuum pump is required to achieve the minimum requirements of a
good vacuum. The vacuum pump oil should be changed at regular scheduled periods to insure proper
operation. It is mandatory to change oil every time a contaminated system is serviced.
3.12.1 Evacuating the Refrigerant
1)
Make sure that power is disconnected from the unit.
2) Install process valves or adaptors if not already completed.
3) Attach manifold gauges.
4) Low side to suction process.
5) High side to filter / drier process.
6) Center port of manifold hose before hand shut-off valve to charging cylinder.
7) Center port of manifold hose after hand shut-off valve to vacuum pump.
8) Make sure that the charging cylinder valve, hand shut-off valve, and manifold gauges are closed.
9) Start vacuum pump.
10) Open the high side manifold valve first.
11) After a couple of minutes slowly open the low side manifold valve.
12) Operate the vacuum pump for a minimum of 30 minutes or 29.9 inches (50 microns).
13) Close the hand shut-off valve to the vacuum pump and watch the low side manifold gauge for a few
minutes. If there is no change in the gauge pressure the system is sealed and no leaks are present.
At this time the system is ready to charge.
If the vacuum pump can not achieve a good vacuum in a reasonable amount of time, or the low side
gauge looses its vacuum (step 8 above) a leak is present.
At this time add a small amount of charge into the system and check for leaks.
R-134A SYSTEMS ARE PARTICULARLY SUSCEPTIBLE TO MOISTURE
CONTAMINATION WHICH CAN ONLY BE PREVENTED BY EVACUATING
THE SYSTEM FOR A MINIMUM OF 30 MINUTES TO ATTAIN A MINIMUM
29.9 INCHES (50 MICRON) VACUUM
Care should be taken when evacuating a system. It is possible with today’s
equipment to draw oil from the compressor thru the low side if both the high
and low side manifold valves are opened initially. To prevent this, start the
vacuum with only the high side open. The low side manifold valve can slowly
be opened after a couple minutes of high side operation.
19
2010 - Viking Preferred Service
SMR-0005
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Страница 6: ...Section 1 Introduction to Dual Zone 2010 Viking Preferred Service SMR 0005 ...
Страница 10: ...Section 2 Dual Zone Characteristics 2010 Viking Preferred Service SMR 0005 ...
Страница 16: ...Section 3 Refrigeration Systems 2010 Viking Preferred Service SMR 0005 ...
Страница 27: ...Section 4 TruProtect Control Diagnostics 2010 Viking Preferred Service SMR 0005 ...
Страница 30: ...Section 5 Mechanical System Components 2010 Viking Preferred Service SMR 0005 ...
Страница 38: ...Section 6 Structural Components 2010 Viking Preferred Service SMR 0005 ...
Страница 42: ...Section 7 Electrical Components 2010 Viking Preferred Service SMR 0005 ...
Страница 50: ...Section 8 Control Components 2010 Viking Preferred Service SMR 0005 ...
Страница 54: ...Section 9 Wiring 2010 Viking Preferred Service SMR 0005 ...
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Страница 59: ...Section 10 Reference Charts 2010 Viking Preferred Service SMR 0005 ...
Страница 64: ...Section 11 Trouble Shooting Guide 2010 Viking Preferred Service SMR 0005 ...
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