707C: Owner’s Information Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
4
A10062
Fig. 4 – Large Chassis Filter Access
Replacing or inspecting filters in units with
economizers
Small Chassis (See
)
1. Remove return air duct cover at rear of unit using a 5/16-in. nut
driver.
2. Remove the filter(s) by pulling it out and through the unit duct
opening. If filter is dirty, replace both filters with new ones.
When installing the new filters, note the direction of the airflow arrows
on the filter frame, which should be pointing at the indoor coil.
3. Reinstall duct cover ensuring opening is air and water tight.
Large Chassis (See
1. Remove filter access door using a 5/16-in. nut driver.
2. Remove the filter(s) by pulling it out and through the unit filter
access door. If filter is dirty, replace both filters with new ones.
Units with bent indoor coils, install 24 x 18 x 1 (610 x 457 x 25 mm)
filter first and then install 24 x 16 x 1 (610 x 406 x 25) filter.
When installing the new filters, note the direction of the airflow arrows
on the filter frame, which should be pointing at the indoor coil.
3. Reinstall filter access door ensuring opening is air and watertight.
Fans and Fan Motors
Periodically check the condition of fan wheels and housings and
fan-motor shaft bearings. Contact your dealer for the required annual
maintenance.
Indoor and Outdoor Coils
Cleaning of the coils should only be done by qualified service personnel.
Contact your dealer for the required annual maintenance.
Condensate Drain
The drain pan and condensate drain line should be checked and cleaned
at the same time the cooling coils are checked by your dealer.
Compressor
All compressors are factory shipped with a normal charge of the correct
type of refrigeration grade oil.
Condenser Fan
The fan must be kept free of all obstructions to ensure proper cooling.
Contact your dealer for any required service.
Electrical Controls and Wiring
Electrical controls are difficult to check without proper instrumentation.
If there are any discrepancies in the operating cycle, contact your local
dealer and request service.
Refrigerant Circuit
The refrigerant circuit is difficult to check for leaks without the proper
equipment. If inadequate cooling is suspected, contact your local dealer
for service.
Unit Panels
After performing any maintenance or service on the unit, be sure all
panels are fastened securely in place to prevent rain from entering unit
cabinet and to prevent disruption of the correct unit airflow pattern.
Regular Dealer Maintenance (Also refer to
)
In addition to the type of routine maintenance you might be willing to
perform, your unit should be inspected regularly by a properly trained
service technician. An inspection (preferably each year) should include
the following:
1. Inspection and, if required, cleaning of the outdoor and indoor
coils.
2. Inspection and, if required, cleaning of the indoor coil drain pan.
3. Inspection and cleaning of blower wheel housing and motor.
4. Inspection of all supply-air and return-air ducts for leaks,
obstructions, and insulation integrity. Any problems found should
be resolved at this time.
5. Inspection of the unit base to ensure that no cracks, gaps, etc., exist
which may cause a hazardous condition.
6. Inspection of the unit casing for signs of deterioration.
7. Inspection of all electrical wiring and components to assure proper
connection.
8. Inspection for leaks in the refrigerant circuit. Pressure check to
determine appropriate refrigerant charge.
9. Operational check of the unit to determine working conditions.
Repair or adjustment should be made at this time.
Your servicing dealer may offer an economical service contract that
covers seasonal inspections. Ask for further details.
LARGE CHASSIS
FILTER
ACCESS
PANEL
WARNING
!
PERSONAL INJURY AND UNIT DAMAGE HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
Do not poke sticks, screwdrivers, or any other object into revolving fan
blades.
WARNING
!
EXPLOSION, BURN AND ENVIRONMENTAL HAZARD
Failure to follow this warning could result in personal injury, death or
property damage.
System under pressure. Relieve pressure and recover all refrigerant
before system repair or final unit disposal. Use all service ports and
open all flow-control devices, including solenoid valves.
