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321023
7.
At 600 microns, close valve "A" to vacuum pump and allow micron reading in system to balance.
Micron level will rise.
• If in 2 minutes, micron level stabilizes at 1000 microns or below, system is ready to be charged.
• If micron level rises above 1000 microns and stabilizes, open valve "A" and continue evacuating.
• If micron reading rises rapidly and does not stabilize, a leak still exists in system.
• Close valve "A" to vacuum pump and valve "C" to vacuum gauge. Invert charging cylinder
and open charging cylinder valve "F" to add partial charge for leak checking. With leak
detector, check manifold connections and system for leaks. After locating leak, capture
refrigerant, repair leak, and begin at step 1.
13.10.2
Charging
NOTE: Do not use captured or recycled refrigerant in units. Captured or recycled refrigerant voids any
warranty.
NOTE: Charge system with exact amount of refrigerant. Refer to unit serial plate for correct refrigerant
charge. Inaccurately charged system will cause future problems.
To charge system:
1.
Close valves "A" to vacuum pump and "C" to vacuum gauge and "E" to low side manifold gauge.
2.
Set scale on dial-a-charge cylinder for corresponding HFC134a pressure reading.
3.
Open valve "F" to charging cylinder and let exact amount of refrigerant flow from cylinder into
system.
Close valve.
Low side gauge pressure should rise shortly after opening charging cylinder valve as system pressure
equalizes through capillary tube.
If pressure does not equalize, a restriction typically exists at capillary/drier braze joint.
4.
If pressure equalizes, open valve "E" to low side manifold gauge and pinch off high side drier
process tube.
5.
Start compressor and draw remaining refrigerant from charging hoses and manifold into
compressor through compressor process tube.
6.
To check high side pinch-off drier process tube, close valve "D" to high side gauge. If high side
pressure rises, repeat high side pinch-off and open valve "D". Repeat until high side pinch-off
does not leak.
7.
Pinch-off compressor process tube and remove charging hose.
compressor is operating.
8.
Disconnect power. Remove charging hose and braze high side drier process tube closed.
9.
Recheck for refrigerant leaks.
13.10.3
Refrigerant Charge
Refrigerant charge in all capillary tube systems is critical and exact amount is required for proper
performance. Factory charges are shown on serial plate.
NOTE: Do not use a refrigerant other than that shown on serial plate.
13.10.4
HFC134a Service Information
HFC134a has an ozone depletion potential (ODP) factor of 0.0 and a global warming potential (GWP)
factor of 0.27. HFC134a is not flammable and has acceptable toxicity levels.
100
Braze stub closed while
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Table of Contents
Troubleshooting
