Electronic Thermostat
The electronic thermostat is
located at the rear
of the case in the electronic
raceway. The thermostat is
equipped with a liquid crystal
display providing a constant
readout of the sensed tempera-
ture.
NOTE: The LCD display will be
blank during defrost. A touch
keypad that allows the users to
select the set point tempera-
ture, differential and the heating
/cooling modes.
Programming Steps for the ETC, Electronic
Temperature Control
All thermostats are pre-set and cycle checked at the
factory.
STEP 1: Press the set key once to access the
Fahrenheit/Celsius mode. The display will dis
play either F degrees Fahrenheit or C for
degrees Celsius. Press the
up arrow or the
down arrow so the display indicates F.
STEP 2: Press the set key again to gain access to the
setpoint. The LCD will display the current
Setpoint and the S1 will be blinking. Press
the up arrow to increase or the down arrow
to decrease the temperature setting.
STEP 3: Press the set key again to gain access to the
differential. The LCD will display the current
differential and the DIF 1 will be blinking.
This should be set at 2°F
.
STEP 4: Press the set key again to gain access to the
cooling or heating mode. The LCD will dis
play the current mode. Press either the up
arrow or the down arrow to set the display in
the C1, cooling mode.
STEP 5: Press the set key once more and the pro
gramming is complete. Set the lock to keep
the set point.
STEP
1.
2.
3.
4
.
DISPLAY INDICATION
F or C
S1 (blinking)
DIF (blinking)
C1/H1
DESCRIPTION
Fahrenheit or Celsius Scale
Setpoint Temperature
Differential Temperature
Cooling or Heating Mode
Refrigeration Information
Case Operation
Refrigeration
The refrigeration in this case is thermostatically
controlled. The case refrigerates until the cut out
point on the thermostat is reached. The thermostat
opens, cutting power to the liquid line solenoid.
The compressor continues to run, the system
pumps down causing the pressure switch to open,
cutting power to the compressor. Note: Some
cases may be ordered with EPR valves to control
case temperature. For proper refrigeration perform-
ance, PRODUCT MUST NOT BE PLACE WHERE
IT WILL AFFECT THE AIR CURTAIN.
Defrost
This case is equipped with an OFF CYCLE defrost
system. The timer cuts the power to the liquid sole-
noid. The unit stays in off cycle defrost until the
defrost timer re-energizes the liquid solenoid.
NOTE: The evaporator fan runs continuously.
For Self Contained Cases
Thermostat cut out
Deli, Bakery 28°-30°
Fresh Meat, Seafood 26°
CRO valve
R-22 55-58
404A 75
134A N/A
TXV: 10° Superheat
Pressure switch
R-22 Low - 20 lb/55 lb High - 350 lb
404A Low - 20 lb/55 lb High - 350 lb
134A Low - 7 lb/25 lb High - 225 lb
Typical Component Settings
NOTE: The above settings are approximate and
will vary slightly with product load, lighting, store
ambient conditions etc. Evaporator fans run con-
stantly.
Wiring
Schematic
Thermostat
For Remote Cases
Thermostat cut out
Deli, Bakery 28°-30°
Fresh Meat, Seafood 26°
EPR Valve (saturated suction temp.)
Deli 18°-20°
Fresh Meat & Seafood 14°
TXV 10° superheat
