Start Up / Operation; Start-Up; Tev Adjustment (Gsvm-5272 Only) - Hussmann GSVM Installation & Operation Manual

P/N 0545716_G
START UP
Follow the electromechanical controls start
up procedures as detailed in Section 2 of this
manual.
Each self contained merchandiser has its own
evaporator coil. Model GSVM-5272 has an
expansion valve (TEV). The TEV has been
factory set at design conditions to provide the
recommended performance. GSVM-4060 and
GSVM-4072 have capillary tubes.
a. Check the interior cabinet thoroughly for
loose nuts, bolts and electrical connections.
b. Inspect the refrigeration lines for visible
damage or chafing.
c. Replace electrical box cover and access
panel.
d. Turn on the electrical power, power
switch and start the merchandiser.
The merchandiser must pull down in
temperature.
Allow merchandiser 24 hours to operate before
loading product.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.

START UP / OPERATION

TEV Adjustment (GSVM-5272 only)

Expansion valves may be adjusted to fully feed
the evaporator. Before attempting to adjust
valves, make sure the evaporator is clear or
only lightly covered with frost, and the
merchandiser is within 10°F of its expected
operating temperature. Adjust the valve as
Follows:
a. Attach a probe to the suction line near the
expansion valve bulb.
b. Obtain a pressure reading from the factory
installed Schraeder valve. Convert the pressure
reading to a saturated temperature for the
refrigerant.
Temperature (b) minus Temperature (a) is the
superheat. The valve should be adjusted so
that the greatest difference between the two
temperatures is 3° F (-16º C) to 5° F (-15º C).
Make adjustments of no more than
of the valve stem at a time and wait for at
least 15 minutes before rechecking the probe
temperature and making further adjustments.
Schrader Valve
GSVM Open Vertical Merchandisers
3-1
1 / turn
2