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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
Insulated
Duct
Recommended
Charge
WM-2500SSHWC
<= 75 FT
1/4" OD
3/8” OD
7/8” OD
8”
R134a/19 OZ
WM-4500SSHWC
<= 75 FT
1/4" OD
1/2” OD
7/8” OD
8”
R134a/26 OZ
WM-6500SSHWC
<= 75 FT
1/4" OD
1/2” OD
7/8” OD
10”
R134a/32 OZ
WM-8500SSHWC
<= 75 FT
3/8" OD
5/8” OD
7/8” OD
10”
R134a/40 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.
1) Evacuate the system; both discharge and suction valves must be in the
middle positions during evacuating.
2) Charge the system through both suction and discharge valves with refrigerant
using the suggested amount; both discharge and suction valves must be in
the middle positions during charging.
3) Turn on the water valve.
4) Connect the power to start the system and check the following temperatures
and pressures.
9. Adjusting and Completing the installation
1) Set the water regulating valve opening set-point at refrigerant pressure of 120
PSIG. Turn counterclockwise to raise the operating set-point.
