-19-
be recessed in the ceiling with short curved rectangular ducts in air supply, but
the air flow CFM must be checked.
2) For a direct blow application, air supply shall be unobstructed minimum
12”.
For a deflector application, leave
2” clearance for air supply.
Air return shall be unobstructed minimum
6”.
3) There is a gravity drain system, so the unit shall be installed level or with a
slight slope downward the drain connection and the drain line shall be installed
slope down toward the drain.
If rise-up is necessary, a condensation pump must be used.
4. Condensing Unit Installation
1) Condensing unit shall be elevated to avoid possible flooding and shaded from
direct sun. The location shall not be subject to freezing temperatures.
2) Water must be supplied to WM-250~850SCUR-WC at all times during
operation, with the maximum outlet temperature of 120 °F. A sufficient amount
of water must be provided for constant head pressure and proper cooling, but
excessive water flow will cause the unit working inefficiently.
3) The maximum permissible water pressure is 150 PSIG. If water pressure is
excessive, a pressure reducing valve must be used to reduce water pressure.
4) Service valve operation
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.
Equivalent
Line Set
Liquid
Line
Suction
Line
Drain Line
Recommended
Initial Charge
WM-
2500SSLWC
<= 75 FT
1/4" OD
3/8” OD
1/2” OD
R134a / 19 OZ
WM-
4500SSLWC
<= 75 FT
1/4" OD
1/2” OD
1/2” OD
R134a / 26 OZ
WM-
6500SSLWC
<= 75 FT
1/4" OD
1/2” OD
1/2” OD
R134a / 32 OZ
WM-
8500SSLWC
<= 75 FT
3/8” OD
5/8” OD
1/2” OD
R134a / 40 OZ
1) The piping starts from
condensing unit’s receiver discharge valve liquid
filter liquid indicator liquid line to evaporator
unit’s liquid line connection
(assembled with solenoid valve and expansion valve) suction line connection
insulated suction line to condensing
unit’s suction valve.