Thermostat (T-Stat) Location; Electrical - Hussmann CR3-F Installation And Operation Manual

Rev. 0707
CONTROL SETTINGS
See the "Case Specs" section of this guidebook
for the appropriate settings for your merchandiser.
Maintain these parameters to achieve near constant
product temperatures. Product temperature should be
measured fi rst thing in the morning, after having been
refrigerated overnight. Defrost times should be as
follows: OFF CYCLE - Consult the Case Specifi cation
Section of this guide for defrost settings. The number
of defrosts per day and the duration of the defrost
cycle may be adjusted to meet conditions present at
your location.
ACCESS TO THERMOSTATIC EXPANSION
VALVE (TEX) & DRAIN LINES
MECHANICAL - Remove product from end of case.
Remove product racks. Remove refrigeration and
drain access panels (labeled). TEX valve (mechanical
only) and drain are located under each access panel
at end of the case.
ELECTRONIC - The Electronic Expansion valve
master and slave cylinder(s) are located within the
electrical access panel(s).
ELECTRONIC EXPANSION VALVE (EEV)
(OPTIONAL)
A wide variety of electronic expansion valves and case
controllers can be utilized. Please refer to EEV and
controller manufacturers information sheet. Sensors
for electronic expansion valves will be installed on the
coil inlet, coil outlet, and in the discharge air. (Some
supermarkets require a 4th sensor in the return
air). Case controllers will be located in the electrical
raceway or under the case.
THERMOSTATIC EXPANSION VALVE
LOCATION
This device is located on the same side as the
refrigeration stub. A balanced port expansion valve
model is furnished as standard equipment, unless
otherwise specifi ed by customer.
EXPANSION VALVE ADJUSTMENT
Expansion valves must be adjusted to fully feed the
evaporator. Before attempting any adjustments,
make sure the evaporator is either clear or very lightly
covered with frost, and that the fi xture is within 10°F
of its expected operating temperature.
MEASURING THE OPERATING SUPERHEAT
1. Determine the suction pressure with an
accurate pressure gauge at the evaporator
outlet.
2. From a refrigerant pressure temperature chart,
determine the saturation temperature at the
Refrigeration
observed suction pressure.
3. Measure the temperature of the suction gas at
the thermostatic remote bulb location.
4. Subtract the saturation temperature obtained
in step No. 2 from the temperature measured in
step No. 3. The difference is superheat.
5. Set the superheat for 5°F - 7°F.
EVAPORATOR PRESSURE REGULATOR (EPR)
An Evaporator Pressure Regulator is installed in the
front of the self service section to maintain a constant
discharge temperature. It is located at the front right
side of the case, under the fan plenum near the TEX
Valve.
SERVICE CASE TEMPERATURE CONTROL
Temperature control in the upper section of the
CR3 with the Service Option is done by means of a
thermostat and suction solenoid valve. This controls
both temperature and humidity.

THERMOSTAT (T-STAT) LOCATION

Thermostats are located within the electrical raceway.
Refer to diagram below. There are also labels on the
back of the case indicating T-Stat location(s).
WIRING COLOR CODE
11
T-Stat &
Ballast Are
Labeled as
Such
Figure #3

Electrical

REFRIGERATED