Carrier AQUAZONE PSV User Manual download pdf (Page 49)

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 dial-type thermometer.

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 field-supplied Pressure-Temperature chart

for R-410A, find equivalent saturated condensing

temperature.

5. Read liquid line temperature on thermometer; then

subtract from saturated condensing temperature. The dif-

ference equals subcooling temperature.

6. Compare the subcooling temperature with the normal

temperature listed in Tables 20-30. If the measured liquid

line temperature does not agree with the required liquid

line temperature, ADD refrigerant to raise the tempera-

ture or REMOVE refrigerant (using standard practices) to

lower the temperature (allow a tolerance of ± 3° F).

Refrigerant Charging

NOTE: Do not vent or depressurize unit refrigerant to atmo-

sphere. Remove and recover refrigerant following accepted

practices.

Air Coil Fan Motor Removal

Disconnect motor power wires 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.

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 10-year lithium

CR2032 battery provides a minimum of 10,000 hours of data

retention during power outages.

NOTE: Power must be ON to the WSHP Open controller

when replacing the battery, or the date, time and trend data will

be lost.

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.

TROUBLESHOOTING

When troubleshooting problems with a WSHP, consider the

following:

Control Sensors — The control system employs 2 nom-

inal 10,000 ohm thermistors (FP1 and FP2) that are used for

freeze protection. Be sure FP1 is located in the discharge fluid

and FP2 is located in the air discharge. See Fig. 38.

Thermistor — A thermistor may be required for single-

phase units where starting the unit is a problem due to low

voltage. See Fig. 39 for thermistor nominal resistance.

WARNING

To prevent personal injury, wear safety glasses and gloves

when handling refrigerant. Do not overcharge system —

this can cause compressor flooding.

CAUTION

Before attempting to remove fan motors or motor mounts,

place a piece of plywood over evaporator coils to prevent

coil damage.

Fig. 36 — Gravity Flow Method

FILL CONDENSER WITH

CLEANING SOLUTION. DO

NOT ADD SOLUTION

MORE RAPIDLY THAN

VENT CAN EXHAUST

GASES CAUSED BY

CHEMICAL ACTION.

PAIL

FUNNEL

CONDENSER

PAIL

3’ TO 4’

VENT

PIPE

5’ APPROX

1”

PIPE

A50-6286

SUCTION

PUMP

SUPPORT

TANK

FINE MESH

SCREEN

RETURN

GAS VENT

PUMP

PRIMING

CONN.

GLOBE

VALVES

SUPPLY

1” PIPE

CONDENSER

REMOVE WATER

REGULATING VALVE

Fig. 37 — Forced Circulation Method

A50-6287

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Carrier AQUAZONE PSV User Manual Page 49

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