37
Troubleshooting
Problem
Possible Cause
Possible Solution
Product too cold
and/ or freezing
Spiral Deck Coil (SDC) is
too cold.
Probe the deck with the product in place. If the deck is less
than 29°F increase the SDC thermostatic SP incrementally.
Allow approximately 60 minutes or stable temperatures for
system to react then recheck temperatures. Verify when SDC
T-Stat is active that SDC is operating at desired Temperature/
Pressure (Evap Pressure).
Gravity Coil (GC) set too
cold
Increase thermostatic set point *(SP ) of GC.
Your setting will depend on store conditions and desired
product temperature. The thermostatic SP is properly set
when the product is ideally 33-38°F. Should ice be forming
on the GC, verify Evaporator Pressure, GC Discharge Air
(DA) is ranging between 33-36°F
Excessive Icing
Ensure excessive icing condition’s don’t exist on SDC or that
any exist on the GC
Evaporator Suction
Temperature
Ensure case evaporator / suction temperature is above 28°F.
Superheat Set Too Low
Check superheat and adjust as necessary. See Case
Specification
T-Stat Sensor And TXV
Bulbs Not Firmly Secured
Ensure that all T-Stat sensor and TXV bulbs are firmly
secured to the pipes in the locations shown in figure (C). The
bulbs should be at the 3 or 9 o’clock position on the pipe.
Take care to insure SDC T-Stat sensor is below the surface
of the Spiral Deck Tube (at mid tube from outer/inner of
spiral) to insure no interference with Deck Plate. Band strap
should be thin gauge copper. GC T-Stat sensor tip should
be located approximately 1” below the bottom fin surface, at
approximately coil center (front-back) and between 18”-24”
from the end of the case wall.
Ensure that the case is piped per the piping diagram (C)
[Note: some components may be optional].
Product dehydrating
prematurely
GC set too cold
Increase thermostatic SP of GC. Your setting will depend
on store conditions and desired product temperature.
The thermostatic SP is properly set when the DA from
the GC is ranging between 33-37°F, depending upon Meat
Department ambient conditions. Product should be turned
and rotated about every 4 hours. Product should be covered
at night with a clean, damp cloth such as cheese cloth if left in
the display case overnight
Product too warm
Improper Case Piping
Verify case is properly piped per the Piping Diagram. Refer to
Pipe Diagram
Improper Suction
Pressure Setting
Verify case suction pressure is set to a 28°F temperature
equivalent when all Solenoid VLV are active/open
Improper Superheat
Setting
Verify superheat. Adjust TX valves accordingly. Deck/Spiral
coil may be set as low as 1-2° SH. Gravity coil may be set
as low as 3° SH. (NOTE, when adjusting TXV superheat,
first adjust the corresponding T-Stat below equivalent suction
temperature. This will ensure that the T-Stat does not close
during the adjustment period. Be sure to return T-Stat to SP.
