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1) Place the condensing units WM-252~652SCUR in a properly ventilated location.
Otherwise, heat exhausted by the condensing unit will build up and the cooling
system will not operate properly.
2) Condensing unit shall be elevated to avoid possible flooding and shaded from
direct sun. It shall not be exposed to temperatures higher than 110 °F or lower
than 50 °F.
3) Leave minimum 5 ft clearance for the air exhaust side and leave minimum 1 foot
clearance for the air intake side.
5. Refrigeration Piping and Leak Testing
NOTE
The line connector sizes of liquid filter and indicator, the valve connector
sizes of condensing unit or the line connector sizes of evaporator unit
may not be the same as the listed refrigeration line sizes.
If the condensing unit is installed above the evaporator unit, use the
suction line one size smaller.
Expansion and solenoid valves have been installed on the liquid line in
the evaporator unit.
The line sizes and refrigerant charges are listed as follows.
Model No.
WM-2520SSV
WM-2520SSV-LA
WM-4520SSV
WM-4520SSV-LA
WM-6520SSV
WM-6520SSV-LA
1) The piping starts from
filter
liquid indicator
(assembled with solenoid valve and expansion valve)
connection
2) If the line set exceeds 75 ft long, use both inverted U trap and suction
accumulator to prevent liquid from flooding back to the compressor.
3) If the condensing unit is located below the evaporator unit, use inverted U trap
to prevent liquid from flooding back to the compressor. If the elevation difference
is more than 10 ft, use both inverted U trap and suction accumulator.
4) If the condensing unit is located more than 10 ft above the evaporator unit, use
U trap to aid oil returning to the compressor.
5) Complete pipe brazing, check solenoid valve and expansion valve restrictions
and perform leak testing.
6) Hook up the drain line and check if water drains.
6. Connecting Electrical Wires
Equivalent
Liquid
Line Set
Line
1/4" OD
<= 75 FT
1/4" OD
<= 75 FT
1/4" OD
<= 75 FT
condensing unit's receiver discharge valve
liquid line
insulated suction line
Suction
Line
3/8" OD
3/4" MPT
1/2" OD
3/4" MPT
1/2" OD
3/4" MPT
to evaporator unit's liquid line connection
to condensing unit's suction valve.
-19-
Drain
Recommended
Line
Initial Charge
R134a / 19 OZ
R134a / 26 OZ
R134a / 32 OZ
liquid
suction line
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