Maintenance Instructions - Haier HC18D1VAR Service Manual

refrigerant liquid line.
5. At the end of the liquid line, the refrigerant passes through a fixed metering device, reducing
pressure and temperature .
6. The liquid, under reduced pressure, then 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 cool the indoor air. The refrigerant has now been converted to cool vapor
7. The cool refrigerant vapor travels through the larger, insulated vapor line to the accumulator.
8. The accumulator 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 when the space temperature is above the set point.
2. This sends a 24 voltage signal through the "Y" terminal to the outdoor unit PCB, after 3 minutes
the compressor contact 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 air handler PCB and
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.

8. MAINTENANCE INSTRUCTIONS

FILTERS
WARNING: DISCONNECT MAIN ELECTRICAL POWER TO THE UNIT BEFORE ATTEMPTING ANY
SERVICE OR MAINTENANCE.
1.
The air conditioning system operates must efficiently with clean air filters, check filters monthly to
determine how frequently your filters need be cleaned. A new home require more frequent filter
attention until dust and fibers 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 installation and maintenance instructions furnished with the electronic cleaner.
OUTDOOR COIL CLEANING
Keep the outdoor coil clean for full 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 or dirty, it may be necessary to clean the coil.
A. Before cleaning coil,TURN OFF ELECTRICAL POWER to the outdoor unit.
B. Remove the top with the outdoor fan attached.
C. Flush water through the coil from the inside out.
NOTE: Avoid getting water on any controls or other electrical devices. If electrical components
get wet, dry it thoroughly before energizing.
There are many commercial coil cleaning materials developed to clean outddor coils. Follow the
manufacturer's instructions when using these marterials. Normally the solvent is sprayed onto the coil.
Allow several minutes for the solvent to dissolve any organic matter .Wash away the solvent and any
dissolved matter with water from a garden hose.
21
Central Air Conditioner
Model: Cooling Only, 13SEER units