2-2
REFRIGERATION / ELECTRICAL
INSULATION
With GAS Defrost
The suction and liquid lines should NOT contact
each other and should be insulated separately
for a minimum of 30 ft (9144 mm) from the
merchandiser.
With OTHER Than Gas Defrost
The suction and liquid lines should be clamped or
taped together and insulated for a minimum of
30 ft (9144 mm) from the merchandiser.
With EITHER of Above
Additional insulation for the balance of the liquid
and suction lines is recommended wherever
condensation drippage is objectionable or the lines
are exposed to ambient conditions.
REFRIGERATION THERMOSTAT
The refrigeration thermostat body is located in
the electrical raceway. The bulb, when factory
installed, is located in the discharge flue.
DEFROST TERMINATION THERMOSTAT
The standard disc type defrost termination
thermostat is not adjustable. This thermostat is
clamped to the coil inlet tube.
EXPANSION VALVE ADJUSTMENT
Expansion valves must be adjusted to fully feed
the evaporator. Before attempting to adjust valves,
make sure the evaporator is either clear or only
lightly covered with frost, and that the fixture is
within 10°F of its expected operating temperature.
Adjust valves as follows.
Attach two (2) sensing probes (either thermocou-
ple or thermistor) to the evaporator. Put one under
the clamp holding the expansion valve bulb and
securely tape the other to the coil inlet line.
Some “hunting” of the expansion valve is normal.
The valve should be adjusted so that during the
hunting the greatest difference between the two
probes is 3–5°F (1.7–2.7°C). With this adjustment,
during a portion of the hunting, the temperature
difference between the probes will be less than 3°F
(1.7°C). Make adjustments of no more than one-
half (
1
/
2
) turn of the valve stem at a time and wait
for at least 15 minutes before rechecking the probe
temperature and making further adjustments.
CDA SENSOR (OPTIONAL)
Factory installed optional CDA sensor is located
where the thermostat bulb would normally be
located. Its leads will be routed through the
electrical raceway and to the rack control panel.
Leads are tagged in the raceway.
P/N 0416183C
