Rail Cooling - Hoshizaki REFRIGERATED PREP TABLE WITH RAISED RAIL 73168 Service Manual

3. Rail Cooling

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