Refrigerant Charging; Air Coil Fan Motor Removal; Troubleshooting; Thermistor - Carrier Aquazone 50PEC09-18 Installation, Start-Up And Service Instructions Manual

4. Read liquid line temperature on thermometer, then
subtract from bubble point temperature. The difference
equals subcooling temperature.

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.
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.

TROUBLESHOOTING

A thermistor may be required for single-
Thermistor —
phase units where starting the unit is a problem due to low
voltage.
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