11
TROUBLE SHOOTING
Symptom-System Operates Long or Continuously
Possible Problem
Possible Cause
Remedy
How Long do the doors stay open?
Door closer need adjust.
Adjust door closer and keep doors closed.
Is the condenser clean?
Dirty condenser.
Clean condenser
Are the condenser fans running?
Fans not running.
Repair or replace
Is the evaporator dirty or iced up?
Iced or plugged evaporator coil(s). Defrost or clean (check control settings)
Are the evaporator fans running?
Fans not running.
Repair or replace
Have you checked the refrigerant level? Shortage of refrigerant.
Repair leak and recharge.
Is there air or other non-condensables in Non-condensables in the system Evacuate and recharge.
the system?
Are all controls functioning properly?
Control contacts or error codes.
Repair or adjust the control.
Checked expansion valve for Freezers? Improper controls adjusted.
Clean or replace.
What is Evaporator Superheat?
Evaporator Superheat too high.
Adjust expansion valve to lower
Superheat setting.
Where is condensing Unit located?
Location too warm.
Ventilate area or change to cooler
Air leaks or doors
location.
Is Box well sealed from air penetrations? Wall panels not locked or wall
Seal leaks, adjust doors or
pentrations not sealed.
replace.
Is system capacity sufficient for product Product load greater than system add additional units or replace.
load?
capacity.
CHECK LIST
A.
Check operating pressures.
B.
Check electrical requirements of unit to supply voltage.
C.
Set temperature control for desired temperature range.
D.
Check condensing unit for vibrating or rubbing tubing. Dampen and clamp as required.
E.
Replace all service valve caps and latch unit covers.
F.
Check that evaporator fan runs after initial pull down.
