Specifications

Maintenance
1. Normal maintenance on all conditioners is generally limited to filter changes. Lubrication of the fan
motor is not required.
2. Filter changes are required at regular intervals. The time period between changes will depend upon the
project requirements. Some applications such as motels produce a lot of lint from carpeting and linen
changes. It is suggested that the filter be checked at 60-day intervals for the first year until experience
is acquired. If light cannot be seen through the filter when held up to sunlight or a bright light, it should
be changed. A more critical standard may be desirable.
3. The condensate drain pan should be checked annually and cleaned and flushed as required.
4. Recording of performance measurements of volts, amps, and water temperature differences (both
heating and cooling) is recommended. A comparison of logged data with start-up and other annual data
is useful as an indicator of general equipment condition.
5. Periodic lockouts always are caused by air or water problems. The lockout (shutdown) of the
conditioner is a normal protective result. Check for dirt in the water system, water flow rates, water
temperatures, airflow rates (may be dirty filter), and air temperatures. If the lockout occurs in the
morning following a return from night setback, entering air below machine limits may be the cause.
Troubleshooting
Should a major problem develop, refer to the following information for possible cause and corrective steps:
Neither fan nor compressor run
1. The fuse may be blown or the circuit breaker is open. Check electrical circuits and motor windings for
shorts or grounds. Investigate for possible overloading. Replace fuse or reset circuit breakers after fault
is corrected.
2. Wires may be loose or broken. Replace or tighten.
3. Supply voltage may be too low. Check it with the power company.
4. Control system may be faulty. Check thermostat for correct wiring and check 24-volt transformer for
burnout.
Fan operates but compressor does not
1. Check capacitor.
2. Wires may be loose or broken. Replace or tighten.
3. The high pressure may have tripped due to:
a) Fouled or plugged condenser ;
b) Lack of or no condenser water ;
c) Too warm condenser water ;
d) Not enough airflow over the coil due to dirty filters;
e) Coil or fan motor failure.
4. The low temperature switch may have tripped due to:
a) Fouled or plugged condenser ;
b) Lack of or no condenser water ;
c) Too warm condenser water ;
d) Not enough airflow over the coil due to dirty filters ;
e) Coil or fan motor failure ;
5. Check thermostat setting, calibration and wiring.
6. The compressor overload protection is open. If the compressor dome is extremely hot, the overload will
not reset until cooled down. If the overload is external, replace it. If the overload is internal, replace the
compressor.
7. The internal winding of the compressor motor may be grounded to the compressor shell. If so, replace
the compressor.
8. The compressor winding may be open. Check continuity with ohmmeter. If the winding is open, replace
the compressor.
Page 24