Commercial Air Conditioner
Model: heat pump, 10SEER UNITS
31
4. This warm ,high pressure liquid leaves the outdoor coil ,and flows through the small copper
refrigerant liquid line.
5. At the end of the liquid line the refrigerant passes through the a flowcheck device ,reducing a
pressure and temperature .
6. As the cool liquid ,under reduced pressure ,enters the indoor coil surface it expands and absorbs
heat from the indoor air passing over the finned surface ..Heat from the indoor air ,causes the low
pressure liquid to evaporate and cools the indoor air. The refrigerant is now a cool vapor.
7. The cool refrigerant vapor travels through the larger ,insulated vapor line to the accumulator .
8. The accumulator separator separates any liquid refrigerant and holds it. Only vapor refrigerant and
refrigerant oil leave the accumulator .The oil is drawn out through a special port inside the
accumulator.
9. Refrigerant vapor flows through the suction line to the intake of the compressor .The cycle then
repeats.
Electrical .
The operation cycle as follows:
1. The thermostat calls for cooling
2. This sends a 24 voltage signal through the “Y” terminal to the compressor start kit ,after 3 minutes
the compressor contactor in the outdoor unit are closed .The compressor and outdoor fan start.
3. At the same time ,a 24 Voltage signal flows through the “G” Terminal to the indoor blower relay.. The
indoor blower starts.
4. the cooling system is now in operation.
5. The thermostat satisfies and ends the call for cooling.
6. This ends the 24 Voltage signal to the compressor start kit and the outdoor unit stops.
7. This ends the 24 voltage signal to the indoor blower relay and this indoor blower strips
8. The system is now off.
9.MAINTENANCE INSTRUCTIONS
FILTERS
WARNING: DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPTING ANY
MAINTENANCE.
1. Keep the air filters clean .A new home may require more frequent filter attention until dust from the
construction is removed.
2. Replace glass fiber filters when dirty.
3. Clean semi-permanent plastic impregnated fiber filters :
A. Vacuum clean; or B: Wash with detergent and water ,air dry thoroughly and re-install.
Caution: Do not operate any system without filters
Note:
if an electronic air cleaner is installed, remove any mechanical filter from the air handler. Follow
the maintenance instructions furnished with the electronic cleaner.
LUBRICATION
In today’s products, indoor blower motor bearings and outdoor unit fan motor bearing are
pre-lubricated by the motor manufacturer.
Motors with oil ports: Add 10 to 20 drops of Electric motor oil or an SE-grade ,non-detergent ,SAE 10-OR
20-grade motor oil to each bearing.
A. every two years for continuous duty,
B. at least every three years for somewhat continuous duty .
C. at least every five years for light duty.
To access oiling ports or to re-lubricate the sealed bearing of the indoor blower motor, remove the blower
assembly.
For access to the outdoor fan motor, remove the unit top and turn the motor onto its with the oil ports up.
OUTDOOR COIL CLEANING
Keep the outdoor coil clean for complete air flow and proper operation .Do not allow leaves ,grass
clippings or other material to obstruct the coil. Do not allow anything to block the coil. Keep fences,
shrubs, or other obstructions at least 24” away from the coil air inlets.
If the coil becomes obstructed, clean it with water from a garden hose.
