C99086
Fig. 28—Burner Rack Removed
I. Condenser Fan
CAUTION: Keep the condenser fan free from all ob- structions to ensure proper cooling operation. Never place articles on top of the unit. Damage to unit may result.
1.Remove 6 screws holding condenser grille and motor to top cover.
2.Turn motor/grille assembly upside down on top cover to expose the fan blade.
3.Inspect the fan blades for cracks or bends.
4.If fan needs to be removed, loosen the setscrew and slide the fan off the motor shaft.
5.When replacing fan blade, position blade so that the hub is 1/8 in. away from the motor end (1/8 in. of motor shaft will be visible).
6.Ensure that setscrew engages the flat area on the motor shaft when tightening.
7.Replace grille.
J. Electrical Controls and Wiring
Inspect and check the electrical controls and wiring annually. Be sure to turn off the gas supply, and then the electrical power to the unit.
Remove access panel to locate all the electrical controls and wiring. Check all electrical connections for tightness. Tighten all screw connections. If any smokey 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 the access panel. Start the unit, and observe at least one complete heating cycle and one complete cooling cycle to ensure proper operation. If discrepancies are observed in either or both operating cycles, 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.
NOTE: Refer to the heating and/or cooling sequence of operation in this publication as an aid in determining proper control operation.
K. Refrigerant Circuit
Inspect all refrigerant tubing connections and the unit base for oil accumulations annually. Detecting oil generally indicates a refrig- erant leak.
If oil is detected or if low cooling performance is suspected,
If no refrigerant leaks are found and low cooling performance is suspected, refer to Checking and Adjusting Refrigerant Charge section in this document.
L. Evaporator Airflow
The heating and/or cooling
M. Metering Device–Check-Flo-Rater® Piston
This metering device is a fixed orifice and is contained in the brass
N. 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
LOSS OF
This switch is located on the liquid line and protects against low suction pressures caused by such events as loss of charge, low airflow across indoor coil, dirty filters, etc. It opens on a pressure drop at about 20 psig. If system pressure is above this, switch should be closed.
To check switch:
1.Turn off gas and then all power to unit.
2.Disconnect leads on switch.
3.Apply ohmmeter leads across switch. You should have continuity on a good switch.
NOTE: Because these switches are attached to refrigeration system under pressure, it is not advisable to remove this device for troubleshooting unless you are reasonably certain that a problem exists. If switch must be removed, remove and recover all system charge so that pressure gauges read 0 psi. Never open system without breaking vacuum with dry nitrogen.
High pressure may be caused by a dirty condenser coil, failed fan motor, or condenser air recirculation.
To check switch:
1.Turn off gas and then all power to unit.
2.Disconnect leads on switch.
3.Apply ohmmeter leads across switch. You should have continuity on a good switch.
O.Copeland Scroll Compressor (Puron Refrigerant
The compressor used in this product is specifically designed to operate with Puron
