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Rev.0303
11
ACCESS TO TX VALVES AND DRAIN LINES
MECHANICAL - Remove product from case. Remove pans.
TX valve (mechanical only) and drain are located under the
pans within the case.
ELECTRONIC - The electronic expansion valve master and
slave cylinder(s) are located within the electrical access
panel(s) in the rear of case. Rear panels lift up and out.
NOTE: Duplex receptacles must be detached before
removing rear panels.
ELECTRONIC EXPANSION VALVE (OPTIONAL)
A wide variety of electronic expansion valves and case
controllers can be utilized. Please refer to EEV and
controller Hussmann’s 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.
THREE THERMOSTATIC EXPANSION VALVES
ALCO balanced port expansion valves are furnished as
standard equipment, unless otherwise specified 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 fixture is within 10°F of its expected
operating temperature.
After case has been brought to
running temperature, tighten glass screws
along clamshell.
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.
3. The difference is superheat.
5. Set the superheat for 5°F - 7°F.
T-STAT LOCATION
T- Stats are located in the electrical section; behind the rear
panel, on the right-hand side of the case (facing the back of
the case).
T-Stat
Electrical Raceway