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Cooling System Operation/Maintenance
Power Supply
Single Package System - Normally the disconnect switch box is mounted on or near these outdoor units.
Split Systems - Each unit (indoor and outdoor) will normally have a disconnect switch mounted on or near each unit. The disconnect switch for the equipment may be fused in the disconnect switch box and/or fuses (or circuit breakers) may be located in the main power box of the structure.
Start Up
Your cooling system is fully automatic, working on a thermostat demand for cooling. To begin operation:
Caution - If your condensing unit is equipped with a compressor crankcase heater, you must have the power supply to the unit on for 24 hours before using the cooling system. If you are not sure if your unit incorporates a compressor crankcase heater, ask your Central City Air serviceman.
Check that the power supply is on. Set the room thermostat to the cooling mode, and set the temperature selector switch below room temperature. The cooling system should cycle according to the temperature setting.
Note: Do not move the thermostat temperature setting excessively, as this may blow a fuse or trip a circuit breaker. Allow at least five minutes after unit shuts off before readjusting thermostat to restart cooling unit. This allows time for pressures in the system to equalize for proper compressor startup. Best operation is obtained by setting the thermostat at the desired temperature and leaving it there, allowing the thermostat to cycle the equipment, rather than readjusting the setting manually to turn cooling on and off. If temperature is not even and comfortable in all rooms, refer to "BALANCING YOUR SYSTEM".
Some cooling systems have tied interlock control that will prevent the compressor from operating for up to five minutes between cycles. The unit will restart automatically on thermostat demand, when this internal timing cycle is completed. This delay may be noticed when setting thermostat for a cooler temperature and the cooling unit does not start immediately; this is normal.
To shut off cooling unit:
- Set thermostat to the highest setting, and/or the SYSTEM switch to off.
- Turn off power supply to unit.
Cooling System Maintenance
Your Central City Air installed system requires very little owner maintenance. Blower, Filter, Condensate Drain, and Outdoor Coil maintenance are the main routine items that the owner should service.
CAUTION: Turn off power to unit before performing any maintenance.
Before calling for service (cooling system)
Insufficient Airflow
If you sense a change in airflow, a dirty air filter is the most likely cause. Inspect the air filter, following the procedures in the General Maintenance section.
Another common cause of insufficient airflow is a blocked return-air or supply-air grille. Be sure that the grilles are not covered by furniture or other items.
Systems with belt drive blowers require adjustment of the blower motor pulley to set blower speed for proper airflow at the beginning of the cooling season. Have your Central City Air serviceman perform this adjustment. The slower blower speed, used for heating, may cause icing on the indoor (evaporator) coil and insufficient air distribution to the living area for cooling system operation. These conditions will cause damage to the cooling system. It is very important that belt drive blowers be re-adjusted at the beginning of each heating and each cooling season.
Cooling System Fails to Operate
If your cooling system fails to operate, follow these step-by-step instructions, and proceed only to the next step if the system fails to start.
- Check that your room thermostat temperature selector is set below house temperature, and system switch is in the COOL position.
- Is the outdoor unit power supply switch "on"?
- Is the furnace power supply "on"? The furnace provides low voltage power for thermostat operation.
- Check the house fuse box for a blown fuse or tripped circuit breaker.
- If your unit has a high-pressure switch, shut off power to unit. Remove access panel to compressor compartment (or control box cover on HS18 units). The high-pressure switch will normally be located on the outdoor coil piping. Push button on switch to reset. DO NOT PUSH RESET BUTTON MORE THAN TWICE. Replace access panel and restore power to unit. See illustration for location of high-pressure switch.
If the system still does not operate, please call Central City Air for assistance.