System information

21
Indoor fan and motor
NOTE: All motors are pre-lubricated. Do not attempt to
lubricate these motors.
For longer life, operating economy, and continuing efficiency,
clean accumulated dirt and grease from the fan wheel and
motor annually.
WARNING: Disconnect and tag electrical power to the unit
before cleaning and lubricating the fan motor and wheel.
Failure to adhere to this warning could cause personal injury
or death.
Outdoor coil, indoor coil, and condensate drain
Inspect the condenser coil, evaporator coil, and condensate
drain at least once each year. The coils are easily cleaned when
dry; therefore, inspect and clean the coils either before or after
each cooling season. Remove all obstructions, including weeds
and shrubs, that interfere with the air flow through the
condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent-and-water
solution.
Rinse coils with clear water, using a garden hose. Be careful
not to splash water on motors, insulation, wiring, or air filter(s).
For best results, spray condenser coil fins from inside to
outside the unit. On units with an outer and inner condenser
coil, be sure to clean between the coils. Be sure to flush all dirt
and debris from the unit base.
Inspect the drain and condensate drain line when inspecting the
coils. Clean the drain and condensate drain line by removing
all foreign matter from the drain. Flush the drain and drain
trough with clear water. Do not splash water on the insulation,
motor, wiring, or air filter(s). If the drain trough is restricted,
clear it with a “plumbers snake” or similar probe device.
Outdoor fan
CAUTION: Keep the condenser fan free from all obstructions
to ensure proper cooling operation. Never place articles on
top of the unit. Damage to unit may result.
1. Remove 6 screws holding outdoor grille and motor to top
cover.
2. Turn motor/grille assembly upside down on top cover to
expose fan blade.
3. Inspect the fan blades for cracks or bends.
4. If fan needs to be removed, loosen setscrew and slide fan
off motor shaft.
5. When replacing fan blade, position blade so that the hub is
3 mm away from the motor end (Fig. 17).
6. Ensure that setscrew engages the flat area on the motor
shaft when tightening.
7. Replace grille.
Electrical controls and wiring
Inspect and check the electrical controls and wiring annually.
Be sure to turn off the electrical power to the unit and install
lockout tag.
Remove access panel to locate all the electrical controls and
wiring. Check all electrical connections for tightness. Tighten
all screw connections. If any smoky or burned connections are
noticed, disassemble the connection, clean all the parts, restrip
the wire end and reassemble the connection properly and
securely.
After inspecting the electrical controls and wiring, replace all
the panels. Start the unit, and observe at least one complete
cooling cycle to ensure proper operation. If discrepancies are
observed in operating cycle, or if a suspected malfunction has
occurred, check each electrical component with the proper
electrical instrumentation. Refer to the unit wiring label when
making these checkouts.
Refrigerant circuit
Inspect all refrigerant tubing connections and the unit base for
oil accumulation annually. Detecting oil generally indicates a
refrigerant leak.
If oil is detected or if low performance is suspected, leak-test
all refrigerant tubing using an electronic leak detector, or liquid
soap solution. If a refrigerant leak is detected, refer to “Check
for refrigerant leaks” section.
If no refrigerant leaks are found and low performance is
suspected, refer to “Checking and adjusting refrigerant charge”
section.
Indoor air flow
The heating and/or cooling air flow does not require checking
unless improper performance is suspected. If a problem exists,
be sure that all supply- and return-air grilles are open and free
from obstructions, and that the air filter is clean. When
necessary, refer to “Indoor air flow and Air flow adjustments”
section to check the system air flow.
PURON® system items
The following items should be taken into consideration when
maintaining your Puron® system.
Metering devices - AccuRater piston
This metering device is a fixed orifice and is contained in the
brass hex body in the liquid line feeding the indoor and outdoor
coils.
Pressure switches
Pressure switches are protective devices wired into control
circuit (low voltage). They shut off compressor if abnormally
high or low pressures are present in the refrigeration circuit.
These pressure switches are specifically designed to operate
with Puron (R-410A) systems. R-22 pressure switches must not
be used as replacements for the Puron (R-410A) system.