4421 Tradition Trail ● Plano, Texas 75093 ● 972-964-2700 ● 800-836-7472
SP-ENG-211-D48-02 Rev 2.3 16 |
P a g e
Preventative Maintenance
Air conditioners may require regular cleaning of the condenser air inlet section. Restriction to the flow
of air over the condenser coil will degrade the performance of the equipment, cause it to overheat,
reduce cooling and can damage the compressor. The overload switch in the compressor may cause
the compressor to cycle if the condensing coil pressure becomes too high due to air restriction. A
further safety feature is the refrigerant high pressure cut off switch which will stop the compressor if the
condensing pressure becomes too high due restricted condenser air flow or some other cause.
Restricted air flow due to neglecting preventative maintenance will cause unit to repeatedly turn off
and then turn back on after it cools off. An operation in this safety cycling mode will eventually damage
the equipment and void the warranty.
Refer to Field Serviceable Parts section in this manual for details on parts that can be changed to help
increase the uninterruptable life of the Air Conditioner.
Condenser and Evaporator Fans
ISC Inc air conditioners use high efficiency, long life, sealed ball bearing fans engineered for optimum
performance that require no maintenance. Keep fan blades clean for optimal performance. Fans are
removable and attached by plug-in connections.
Compressor
ISC Inc uses hermetically factory sealed compressors that are quiet, low vibration and are
maintenance free. Thermal overload devices are installed to protect the compressor from damage
due to overheat and short cycle faults. If the compressor thermal overload fails, it is recommended to
return the unit to ISC Inc customer service for proper replacement. Note that the rotary compressor
runs with compressed refrigerant gas on the outer case and therefore is hot to the touch.
Loss of Refrigerant
DELTA-T air conditioners are meticulously leak and run tested after assembly. If a leak in the system
should develop due to shipping damage or mechanical vibration, the leak must be detected, repaired
and the refrigerant charge restored to the system by a qualified refrigeration professional. If pressure
gauges are connected to the hermetic system, be prepared to replace lost refrigerant resulting from
connection and disconnection. It is recommended to use stubby gauges with low loss fittings to
minimize refrigerant loss.
Condenser Coils
Depending on the environment the condenser coils may become dirty and the air conditioner may lose
efficiency, causing overheating and diminished cooling capacity. Dirty condensing coils must be back-
flush cleaned using proper commercial coils cleaning compounds and thorough back-flushing rinsing.
Refer to directions on the cleaning compounds selected. Acid wash is not recommended as it reduces
the life of the coil.
