Bryant DURAPAC 579F Installation, Start-Up And Service Instructions Manual page 39

G. EconoMi$erIV Troubleshooting Completion
This procedure is used to return the EconoMi$erIV to opera-
tion. No troubleshooting or testing is done by performing the
following procedure.
1. Disconnect power at TR and TR1.
2. Set enthalpy potentiometer to previous setting.
3. Set DCV maximum position potentiometer to previ-
ous setting.
4. Set minimum position, DCV set point, and exhaust
potentiometers to previous settings.
5. Remove 620-ohm resistor from terminals S
PROBLEM
Compressor and Condenser Power failure.
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.
Three phase power incorrectly connected (579F180 and 216
only). Indicated by flashing red LED on Phase Monitor Relay
(PMR) board (see Control Box Component Arrangement for
location).
Compressor Will Not Start Faulty wiring or loose connections in compressor circuit.
but Condenser Fan Runs.
Compressor motor burned out, seized, or internal overload
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 Pressure. Dirty air filter.
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 Low. Dirty air filter.
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
6. Remove 1.2 kilo-ohm checkout resistor from terminals
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. Recon-
10. Remove jumper from P to P1. Reconnect device at P
11. Apply power (24 vac) to terminals TR and TR1.
and +.
R
Table 26 — Cooling Service Analysis
CAUSE
— 39 —
S and +. If used, reconnect sensor from terminals S
O
and +.
nect wires at T and T1.
and 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.
Correct field power phasing.
Check wiring and repair or replace.
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.
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