Start Up / Operation; Start-Up; Tev Adjustment - Hussmann GSVM Installation & Service Manual

P/N 0515275_F
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 merchan
diser must pull down in temperature. Allow
merchandiser 24 hours to operate before
loading product.
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.
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.

START UP / OPERATION

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
the valve stem at a time and wait for at least 15
minutes before rechecking the probe tempera-
ture and making further adjustments.
GSVM Open Vertical Merchandisers
3-1
1
/ turn of
2