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12
10. Replace cap on service ports. Do not remove the flare caps from the service ports
except when necessary for servicing the system.
11. Release the refrigerant charge into the system. Open both the liquid and suction
valves by removing the plunger cap and with an hex wrench back out counter
-clockwise until valve stem just touches the chamfered retaining wall.
12. Replace plunger cap finger tight, then tighten an additional 1/12 turn (1/2 hex flat).
Cap must be replaced to prevent leaks.
Never attempt to repair any brazed connections while the system is under pres-
sure. Personal injury could result.
See "System Charge" section for checking and recording system charge.
4.0 INTERCONNECTING TUBING
4.1 SUCTION AND LIQUID LINES
Keep all lines sealed until connection is made.
Make connections at the indoor coil first.
Refer to Li ne Size Information in Ta bles 2 and 3 for correct size and multipliers to be
used to determine capacity for various suction line diameters and lengths of run. The
losses due to the lines being exposed to outdoor conditions are not included.
The factory refrigerant charge in the outdoor unit is sufficient for 15 feet of standard
size interconnecting liquid line. Calculate actual charge required with installed liquid
line size and length as below.
1/4" ± .2 oz. per foot
5/16" ± .4 oz. per foot
3/8" ± .6 oz . per foot
1/2" ± 1.2 oz . per foot
4.2 MAXIMUM LENGTH OF LINES
T h e maximum length of interconnecting line is 150 feet (Just for scroll compressor) .
Always use the shortest length possible with a minimu m number of bends.
NOTE: Excessively long refrigerant lines cause loss of equipment capacity.
4.3 VERTICAL LIFT
Keep the vertical lift to a minimum. Use the following guidelines when installing
the unit:
1. DO NOT exceed the vertical lift as indicated on Table 3.
2. It is recommended to use the smallest liquid line size permitted to minimize sys -
t em charge which will maximize compressor reliability.
3. Table 3 may be used for sizing horizontal runs.
5.0 EVACUATION
It will be necessary to evacuate the system to 350 microns or less. If a leak is
suspected, leak test with dry nitrogen to locate the leak. Repair the leak and test again.
To verify that the system has no leaks, simply close the valve to the vacuum pump
suction to isolate the pump and hold the system under vacuum. Watch the micron
gauge for a few minutes. If the micron gauge indicates a steady and continuous rise,
it's an indication of a leak. If the gauge shows a rise, then levels off after a few minutes
and remains fairly constant, its an indication that the system is leak free but still
contains moisture and may require further evacuation if the reading is above 350
microns.
WARNING
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