hussmann P/N 0387183_D - Manual (Page 13)

Reach-In
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
merchandiser is within 10 deg F (6.5 deg C) of
its expected operating temperature. Adjust valves
as follows:
Attach two sensing probes
(either thermocouple or
thermistor) to the evaporator.
Position one under the clamp
holding the expansion valve
bulb; 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 deg F (1.7–2.8 deg C).
With this adjustment, during
a portion of the hunting the
temperature difference
between the probes will be
less than 3 deg F (1.7 deg C)
and at times 0.
Make adjustments of no more
than
1 / 4 turn for Balanced
Port TEV and 1 / 2 turn at a
time for other valve models.
Wait at least 15 minutes
before rechecking the probe
temperature or making further
adjustments.
REFRIGERATION THERMOSTAT
The thermostat body is located in the electrical
raceway near the right-hand end of the merchan-
diser. Its sensing bulb is located behind the right
end interior back panel.
P/N 0387183_D 2-3
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
Heat
Exchanger
body
Expansion
Valve
Expansion Valve
Bulb
Check Valve
Optional
Gas Bypass
Manifold Thermostat
Component Location in
RL / RM / RLN / RLNI Models