Carrier Bryant Payne day and night 585A/YAC - Cooling Troubleshooting Guide

TABLE IX—COOLING SERVICE ANALYSIS CHART
SYMPTOM
CAUSE
REMEDY
Compressor and condenser
fan will not start.
Power failure
Cal! power company.
Fuse blown or circuit breaker tripped Replace fuse or reset circuit breaker.
Defective thermostat, contactor, transformer, or control relay
Replace component.
Insufficient line voltage Determine cause and correct.
Incorrect or faulty wiring
Check wiring diagram and rewire correctly.
Thermostat setting too high
Lower thermostat setting below room temperature.
Compressor will not start
but condenser fan runs.
Faulty wiring or loose connections in compressor circuit
Check wiring and repair or replace.
Compressor motor burned out, seized, or internal
overload open
Determine cause. Replace compressor.
Defective run/start capacitor, overload, start relay
Determine cause and. rep.lace.
One leg of three-phase power dead
Replace fuse or reset circuit breaker. Determine cause.
Compressor cycles (other
than normally satisfying
thermostat)
Refrigerant overcharge or undercharge
Blow refrigerant, evacuate system, and recharge to nameplate.
Defective compressor Replace and determine cause.
Insufficient line voltage Determine cause and correct.
Blocked condenser Determine cause and correct.
Defective run/start capacitor, overload, start relay,
or reset relay
Determine cause and replace.
Defective thermostat Replace thermostat.
Faulty condenser fan motor or capacitor Replace.
Restriction in refrigerant system
Locate restriction and remove.
Compressor operates
continuously.
Dirty air filter Replace filter.
Unit undersized for load Decrease load or increase unit size.
Thermostat set too low | Reset thermostat.
Low refrigerant charge Locate leak, repair, and recharge.
Leaking valves in compressor
Replace compressor.
Air in system
Blow refrigerant, evacuate system, and recharge.
Condenser coil dirty or restricted
Clean coil or remove restriction.
Excessive head pressure
Dirty air filter
Replace filter.
Dirty condenser coil
Clean coil.
Refrigerant overcharged
Purge excess refrigerant.
Air in system
Blow refrigerant, evacuate system, and recharge.
Condenser air restricted or air short cycling
Determine cause and correct.
Head pressure too low
Low refrigerant charge
Check for leaks, repair, and recharge.
Compressor valves leaking
Replace compressor.
Restriction in liquid line
Remove restriction.
Excessive suction pressure
High heat load
Check for source and eliminate.
Compressor valves leaking Replace compressor.
Refrigerant overcharged
Purge excess refrigerant.
Suction pressure too low
Dirty air filter Replace filter.
Low refrigerant charge
• Check for leaks, repair, and recharge.
Metering device or low side restricted Remove source of restriction.
Insufficient evaporator airflow
Increase air quantity. Check filter—replace if necessary.
Temperature too low in conditioned area
Reset thermostat.
Outdoor ambient below 65®F Install low-ambient kit.
Filter-drier restricted Replace.
If the coils are coated with dirt or lint, they should be
vacuumed with a vacuum cleaner’s soft brush attachment.
Be careful not to bend the fins. If the coils are coated with
oil or grease, they may be cleaned with a mild detergent and
water solution. Rinse coils with clear water. Be careful not
to splash water on motors, insulation, wiring, or filters.
D. Condensate Drain
The drain pan and condensate drain should be checked at the
same time the cooling coils are checked. Clean the drain pan
and condensate drain by removing any foreign matter from
the pan. Flush pan and drain tube with clear water. If the
drain tube is restricted, it can generally be cleared with
high-pressure water. If this does not work, try a “plumber’s
snake” or similar probe device.
E. Evaporator Blower
The blower should be inspected at least once each year. Re¬
move caked-on dirt from the blower wheel and housing with
brush; remove grease with mild solvent. Make sure blower is
centered in the blower housing.
F. Condenser Fan
The condenser fan should be kept free of all obstructions to
ensure proper cooling. Do not set articles on top of the cool¬
ing unit that could possibly interfere with the airflow of the
fan.
WARNING: Do not poke sticks, screwdrivers, or any other
object into revolving fan blades—severe bodily injury may
result.
The required fan position is shown in Figure 3. Adjust the
fan position by loosening the setscrews and moving the fan
up or down.
G. Electrical Controls and Wiring
With power disconnected to unit, check all electrical connec¬
tions for tightness. Tighten all screws on connections. If any
smoky or burned connections are noticed, disassemble tbe
connection, clean all parts, strip wire, and reassemble prop¬
erly and securely. Electrical controls are difficult to check
without proper instrumentation; therefore, reconnect
electrical power to unit and observe unit through one com¬
plete operating cycle. If there are any discrepancies in the
operating cycle, contact your Dealer and request service.
H. Refrigerant Circuit
The refrigerant circuit is difiicult to check for leaks without
proper equipment. Therefore, if low-cooling performance is
suspected, contact your local Dealer for service.
I. Cleaning the Heating Section
1. Turn off power to main disconnect switch.
2. Remove control access panel.
3. Turn off manual gas valve and pilot gas cock.
4. Disconnect pilot and escapement tubing.
5. Remove burners.
6. Remove flue baffle retainer and vent section shelf.
7. Remove flue baffle.
8. Clean passages with suitable brush.
9. Reassemble by reversing above procedure.
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