Carrier 48TM016-028 Installation, Start-Up And Service Instructions Manual page 52

7. Remove jumper from TR to N.
8. Remove jumper from TR to 1.
9. Remove 5.6 kilo-ohm resistor from T and T1. Reconnect
wires at T and T1.
PROBLEM
Compressor and Power failure.
Condenser Fan
Fuse blown or circuit breaker tripped.
Will Not Start.
Defective thermostat, contactor, transformer, or control
relay.
Insufficient line voltage.
Incorrect or faulty wiring.
Thermostat setting too high.
Compressor Will Not Faulty wiring or loose connections in compressor circuit. Check wiring and repair or replace.
Start but Condenser Fan
Compressor motor burned out, seized, or internal over-
Runs.
load open.
Defective overload.
Compressor locked out
One leg of 3-phase power dead.
Compressor Cycles Refrigerant overcharge or undercharge.
(other than normally
satisfying thermostat).
Defective compressor.
Insufficient line voltage.
Blocked condenser.
Defective overload.
Defective thermostat.
Faulty condenser-fan motor.
Restriction in refrigerant system.
Compressor Operates Dirty air filter.
continuously.
Unit undersized for load.
Thermostat set too low.
Low refrigerant charge.
Air in system.
Condenser coil dirty or restricted.
Excessive Head Dirty air filter.
Pressure.
Dirty condenser coil.
Refrigerant overcharged.
Faulty TXV.
Air in system.
Condenser air restricted or air short-cycling.
Head Pressure Too Low. Low refrigerant charge.
Restriction in liquid tube.
Excessive Suction High heat load.
Pressure.
Faulty TXV.
Refrigerant overcharged.
Suction Pressure Too Dirty air filter.
Low.
Low refrigerant charge.
Metering device or low side restricted.
Faulty TXV.
Insufficient evaporator airflow.
Temperature too low in conditioned area.
Field-installed filter drier restricted.
LEGEND
TXV — Thermostatic Expansion Valve
10. Remove jumper from P to P1. Reconnect device at P and
11. Apply power (24 vac) to terminals TR and TR1.
Table 27 — Cooling Service Analysis
CAUSE
52
P1.
REMEDY
Call power company.
Replace fuse or reset circuit breaker.
Replace component.
Determine cause and correct.
Check wiring diagram and rewire correctly.
Lower thermostat setting below room temperature.
Determine cause. Replace compressor.
Determine cause and replace.
Determine cause for safety trip and reset lockout.
Replace fuse or reset circuit breaker.
Determine cause.
Recover refrigerant, evacuate system, and recharge
to nameplate.
Replace and determine cause.
Determine cause and correct.
Determine cause and correct.
Determine cause and replace.
Replace thermostat.
Replace.
Locate restriction and remove.
Replace filter.
Decrease load or increase unit size.
Reset thermostat.
Locate leak, repair, and recharge.
Recover refrigerant, evacuate system, and recharge.
Clean coil or remove restriction.
Replace filter.
Clean coil.
Recover excess refrigerant.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover refrigerant, evacuate system, and recharge.
Determine cause and correct.
Check for leaks, repair, and recharge.
Remove restriction.
Check for source and eliminate.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Recover excess refrigerant.
Replace filter.
Check for leaks, repair, and recharge.
Remove source of restriction.
1. Check TXV bulb mounting and secure tightly to
suction line.
2. Replace TXV if stuck open or closed.
Increase air quantity. Check filter and replace if
necessary.
Reset thermostat.
Replace.