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•
The line connection sizes of liquid filter & indicator, the valve connection
sizes of condensing unit and the line connection sizes of evaporator unit
are not necessary the same as the listed refrigeration line sizes.
•
If the condensing unit is installed above the evaporator unit, use the
suction line one listed size smaller.
•
Expansion and solenoid valves have been installed on the liquid line in
the evaporator unit.
1) The installation order starts from condensing unit (including receiver and
discharge valve), liquid line filter-drier, moisture-liquid indicator, liquid line, to
evaporator unit (including liquid line connection, solenoid valve, expansion
valve, and suction line connection), returning to insulated suction line, suction
valve and then back to condensing unit.
2) 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 or the line set exceeds 75 ft, use both inverted U
trap and suction accumulator.
3) If the condensing unit is located more than 10 ft above the evaporator unit, use
U trap to aid oil returning to the compressor.
4) Complete pipe brazing, check solenoid valve and expansion valve restrictions
and test leak.
5) Hook up the drain line and check if water drains.
The line sizes and refrigerant charges are listed as follows.
Model No
Equivalent
Line Set
Liquid
Line
Suction
Line
Drain Line
Recommended
Charge
WM-1520SSL
<= 75 FT
1/4" OD
3/8” OD
1/2” OD
R134a/15 OZ
WM-2520SSL
<= 75 FT
1/4" OD
3/8” OD
1/2” OD
R134a/19 OZ
WM-4520SSL
<= 75 FT
1/4" OD
1/2” OD
1/2” OD
R134a/26 OZ
WM-6520SSL
<= 75 FT
1/4" OD
1/2” OD
1/2” OD
R134a/32 OZ
7. Connecting Electrical Wires
Connect all electrical components using the wiring diagrams in accordance with all
state and local codes.
8. Evacuating, Charging and Starting the system
CAUTION:
•
Always use the superheat and subcooling, pressure readings to charge
refrigerant properly; the listed charge amounts are used for reference
only.
•
If the unit is equipped with a low ambient condition kit and installed in the
summer, charge 15% more refrigerant.
•
If the low ambient condition kit is used, turn off the compressor before
power the condensing unit. Only turn on the compressor after the
condensing unit has been powered for 12 hours.
