START-UP
The procedure for
1.Operate the unit for a period of at least 15 minutes to allow for pressures and temperatures to stabilize. Unless matched with an indoor section using an expansion valve, the superheat method can be used to check the system refrigerant charge. It should be noted that this method is not accurate at low load conditions or at outdoor ambients above 106° F.
2.Using accurate gauges and temperature measuring devices, determine the suction line pressure and temperature as well as the outdoor ambient tempera- ture.
3.Refer to the refrigerant charging instruction label located on the inside of the outdoor unit access panel. Locate the intersection of the measured outdoor temperature and suction line pressure on the chart.
4.If the suction line temperature is higher than the intersection temperature, the system is undercharged. If the actual suction line temperature is lower than the chart temperature, the system is overcharged.
Discharge Thermostat (if used)
Some models come equipped with a discharge thermostat (loss of charge control) to guard against the compressor overheating from loss of charge. The temperature cut out for this control is set at 250°F, as determined by compres- sor manufacturer’s recommendation. Discharge tem- peratures exceeding 250°F will cause compressor oil breakdown that will lead to premature compressor failure. If the control trips during unit operation, a problem exists within the system. Check for the following as possible causes:
•Low system charge
•High discharge pressures
A thorough inspection of the system should be made to determine the cause. The discharge gas temperature may be verified by attaching an electronic type thermometer or thermocouple to the discharge line near the control.
The control resets automatically. If the unit does not have a discharge thermostat, an
MAINTENANCE
WARNING
Before performing maintenance operations on system, turn off all main power switches to indoor and outdoor units. Turn off accessory heater power switch if applicable. Electrical shock could cause personal injury or death.
Homeowner Maintenance
Leaves and other large obstructions should be carefully removed from the outdoor coil surfaces without damaging the fin surface of the coil.
Routinely clean or change the indoor air filter. Should the coil become dirty, thus restricting airflow, call a qualified service person to carefully clean the coil surface.
Dealer Maintenance
An annual inspection by a qualified service person should be performed to ensure continued quality performance.
Outdoor coil surfaces should be cleaned, taking care not to damage the fin surface of the coil.
Several weep holes located in the unit base should be inspected and cleaned, if necessary, to ensure that proper drainage can occur.
All electrical wiring and connections should be inspected; as should all physical connections of individual compo- nents within the units.
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