Clean condensers with an inhibited hydrochloric acid solu- tion. The acid can stain hands and clothing, damage concrete, and, without inhibitor, damage steel. Cover surroundings to guard against splashing. Vapors from vent pipe are not harmful, but take care to prevent liquid from being carried over by the gases.
Warm solution acts faster, but cold solution is just as effec- tive if applied for a longer period.
GRAVITY FLOW METHOD — Do not add solution faster than vent can exhaust the generated gases.
When condenser is full, allow solution to remain overnight, then drain condenser and flush with clean water. Follow acid manufacturer’s instructions. See Fig. 23.
FORCED CIRCULATION METHOD — Fully open vent pipe when filling condenser. The vent may be closed when condenser is full and pump is operating. See Fig. 24.
Regulate flow to condenser with a supply line valve. If
PUMP PRIMING CONN.
SUCTION
PUMP
SUPPORT
TANK
FINE MESH
SCREEN
GAS VENT 
GLOBE
VALVES
SUPPLY
1” PIPE
CONDENSER
REMOVE WATER
REGULATING VALVE
RETURN
pump is a nonoverloading type, the valve may be fully closed while pump is running.
For average scale deposit, allow solution to remain in con- denser overnight. For heavy scale deposit, allow 24 hours. Drain condenser and flush with clean water. Follow acid manu- facturer’s instructions.
Checking System Charge — Units are shipped with full operating charge. If recharging is necessary:
1.Insert thermometer bulb in insulating rubber sleeve on liquid line near filter drier. Use a digital thermometer for all temperature measurements. DO NOT use a mercury or
2.Connect pressure gage to discharge line near compressor.
3.After unit conditions have stabilized, read head pressure on discharge line gage.
NOTE: Operate unit a minimum of 15 minutes before checking charge.
4.From standard
5.Read liquid line temperature on thermometer; then subtract from saturated condensing temperature. The dif- ference equals subcooling temperature.
Fig. 24 — Forced Circulation Method
6.ADD refrigerant to raise the temperature or REMOVE refrigerant (using standard practices) to lower the temper- ature (allow a tolerance of ± 3° F), as required.
Refrigerant Charging
WARNING
To prevent personal injury, wear safety glasses and gloves when handling refrigerant. Do not overcharge system — this can cause compressor flooding.
NOTE: Do not vent or depressurize unit refrigerant to atmo- sphere. Remove and recover refrigerant following accepted practices.
Air Coil Fan Motor Removal
CAUTION
Before attempting to remove fan motors or motor mounts, place a piece of plywood over evaporator coils to prevent coil damage.
FILL CONDENSER WITH CLEANING SOLUTION. DO NOT ADD SOLUTION MORE RAPIDLY THAN VENT CAN EXHAUST GASES CAUSED BY CHEMICAL ACTION.
VENT
PIPE
3’ TO 4’
PAIL
FUNNEL
1”
PIPE
5’ APPROX
CONDENSER
Motor power wires need to be disconnected from motor terminals before motor is removed from unit.
1.Shut off unit main power supply.
2.Loosen bolts on mounting bracket so that fan belt can be removed.
3.Loosen and remove the 2 motor mounting bracket bolts on left side of bracket.
4.Slide motor/bracket assembly to extreme right and lift out through space between fan scroll and side frame. Rest motor on a high platform such as a step ladder. Do not allow motor to hang by its power wires.
Replacing the WSHP Open Controller’s Bat-
tery — The WSHP Open controller’s
NOTE: Power must be ON to the WSHP Open controller when replacing the battery, or the date, time and trend data will be lost.
PAIL
Fig. 23 — Gravity Flow Method
1.Remove the battery from the controller, making note of the battery's polarity.
2.Insert the new battery, matching the battery's polarity with the polarity indicated on the WSHP Open controller.
46