Pahwa Group Delair RD Series, Operating, Installation And Maintenance Manual

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6. Relay burned
out. a) Low or high line voltage.
b) Incorrect running capacitor.
c) Short cycling.
d) Wrong relay.
e) Incorrect mounting
a) Voltage must be within 10% of voltage listed
on identification plate.
b) Replace with proper capacitance.
c) Refer to b and c.
d) Replace with proper relay.
e) Mount in correct, rigid position.
7. Starting
Capacitors Burn
out. a) Relay not functioning
properly.
b) Short cycling.
c) Prolonged operation on
starting winding.
d) Improper capacitor a) Repair or replace.
b) Refer to b and c.
c) Raise voltage, if low. Check, if relay is correct.
d) Replace with proper capacitor.
8. Running
Capacitors
Burn out. a) Improper capacitor.
b) High line voltage.
a) Replace with proper capacitor.
b) Lower voltage should not be more than 10%
of the rating.
9. Head Pressure
too High. a) Air in system
b) Dirty condenser.
c) Location too hot. a) Check for reason, repair.
b) Blow clean with compressed air.
c) Cool ambient, relocate unit.
10 Head
Pressure too Low. a) Refrigerant shortage.
b) Compressor suction or
discharge valves inefficient.
(indicated by high head)
c) Defective fan control.
d) Inlet air temperature too low. a) Repair leak and recharge.
b) Repair or replace.
c) Repair, adjust or replace.
d) Unit should be shut down when inlet air is 40
deg. F or lower. Air may be passed thru unit.
10. Auto
Drain Failure
a) Loose connection
b) Due to dust contamination in
valve
c) Low voltage a) Proper connection
b) Regular clean the valve
c) Ensure minimum nominal voltage should
be 220V AC
11. Noisy nit. a) Mountings loose.
b) Bent fan blade.
c) Fan motor bearing worn.
d) Refrigerant flooding back. a) Tighten mounting etc.
b) Straighten or replace blade.
c) Replace.
d) Unit overcharged.
12. Frosted
suction line.
A) Pressure regulating valve out
of adjustment.
a) Adjust evaporator suction minimum setting to
30 deg. F. No load. Refer to installation and
maintenance instruction.
13. Top
condenser coils
cool when unit in
operation.
A) Refrigerant shortage.
B) Compressor inefficient.
a) Repair leak and recharge.
B) Repair or replace.
15. Unit runs
but air temperature
is high.
a) Freon leak
b) Evaporator controls set too a) Locate with leak detector. Repair or replace
defective part.
b) Refer to m above.