36
3. Rail Cooling
Problem
Possible Cause
Remedy
[1] Rail temperature too
high.
a) Warm Food
1. Warm food recently
placed in rail area.
1. Pre-cool food or allow time
for unit to return to setpoint
temperature.
b) Rail Pans/Dividers
1. Missing, not in place. 1. Replace. Pans must cover
entire rail for proper cooling.
c) Outside Heat Source
1. Too close to unit.
1. Separate unit from heat
source.
d) Rail Switch
1. "OFF" position.
1. Move to "NORMAL" or
"LOW" position.
2. Bad contacts.
2. Check for continuity and
replace.
e) Rail Thermistor
1. Defective.
1. See "II.E. Thermistor
Check."
f) Setpoint and/or
Temperature
Correction Factor
1. Incorrect.
1. Correct setting(s).
See "II.D.4.c) Temperature
Setpoint" or
"II.D.4.f) Temperature
Correction Factor" for
defaults.
g) Air Filter or Condenser 1. Clogged, dirty.
1. Clean.
h) Rail Liquid Line Valve
1. Does not open.
1. Check and replace.
i) Service Valve(s)
1. Partially or completely
closed.
1. Confirm service valve is
open.
j) Refrigerant
1. Leak.
1. Recover, repair leak,
replace drier, evacuate, and
recharge.
k) Expansion Valve
1. Operating erratically.
1. Check and replace.
l) Compressor
1. Defective.
1. See "1.[3] Compressor will
not start or stops operating."
m)Control Board
1. Defective.
1. Replace.
[2] Rail temperature too
low.
a) Setpoint and/or
Temperature
Correction Factor
1. Incorrect.
1. Correct setting(s).
See "II.D.4.c) Temperature
Setpoint" or
"II.D.4.f)Temperature
Correction Factor" for
defaults.
b) Frozen Food
1. Frozen food recently
placed in refrigerator.
1. Allow time for unit to return
to setpoint temperature.
c) Rail Thermistor
1. Defective.
1. Check and replace.
d) Rail Liquid Line Valve
1. Does not close.
1. Check and replace.
e) Rail Fan Motor
1. Defective.
1. Check and replace.
f) Control Board
1. Defective.
1. Replace.
Summary of Contents for HPR100A
Page 66: ...66 3 HPR100A D AWAITING DATA...
