7
Fig. 8 — CoreMax
1
Access Port Assembly
1. CoreMax is a registered trademark of Fastest, Inc.
5/8
” HEX
0.47
30°
0.596
1/2-20 UNF RH
1/2
” HEX
45°
WASHER
O-RING
7/16-20 UNF RH
DEPRESSOR PER AHRI 720
+.01/-.035
FROM FACE OF BODY
This surface provides a metal to metal seal when
torqued into the seat. Appropriate handling is
required to not scratch or dent the surface.
SEAT
CORE
(Part No. EC39EZ067)
Table 1 — Cooling Service Analysis
PROBLEM
CAUSE
REMEDY
Compressor and Condenser
Fan Will Not Start
Power failure.
Call 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 replace.
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.
Recover 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, or start
relay.
Determine cause and correct.
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.
Recover 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.
Recover excess refrigerant.
Air in system.
Recover 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 tube.
Remove restriction.
Excessive Suction Pressure
High head load.
Check for source and eliminate.
Compressor valves leaking.
Replace compressor.
Refrigerant overcharged.
Recover excess refrigerant.
