Q3-DC 0907
6
Electrical
WIRING COLOR CODE
G R E E N
G RO U N D
P U R P L E
A N T I - S W E AT
O R A N G E
L I G H T S
Y E L L OW
R E C E P TA C L E
R E D / B L A C K
T- S TAT / S O L E N O I D 230V
BLACK / WHITE
T- S TAT / S O L E N O I D 115V
B ROW N
FAN MOTORS
CASE MUST BE GROUNDED
NOTE: Refer to label affi xed to case to determine the actual confi guration
as checked in the “TYPE INSTALLED” boxes.
Electrical Circuit Identifi cation
Standard lighting for all models will be full length
fl uorescent lamps located within the case at the top.
The switch controlling the lights, the plug provid ed for
digital scale, and the thermometer are lo cated at the
rear of the case mullion.
The receptacle that is provided on the exterior back
of these models is intended for computerized scales
with a fi ve amp maximum load, not for large motors or
other high wattage appliances. It should be wired to a
dedicated circuit.
NOTE: The total case electrical draw must
not exceed 30 Amps ampacity at 115V in one
connected lineup.
ELECTRICAL SERVICE RECEPTACLES
(When Applicable)
The receptacles located on the exterior of the
merchandiser are intended for scales and lighted
displays. They are not intended nor suitable for large
motors or other external appliances.
BEFORE SERVICING
This includes (but not limites to) Fans, Heaters,
Thermostats, and Lights
ALWAYS DISCONNECT ELECRICAL POWER
AT MAIN DISCONNECT WHEN SERVICING OR
REPLACING ANY ELECTRICAL COMPONENT.
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.
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.
After case has been brought to running
temperature verify screws along glass clamp
aluminum extrusion are tight.
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
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.
5. The difference is superheat.
6. Set the superheat for 5°F - 7°F.
THERMOSTAT LOCATION
Thermostats are located in the electrical section;
behind the rear panel, on the right-hand side of the
case (facing the back of the case).
Refrigeration (continued)
