P/N 3137884_A
3-1
HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
Q2SSM-R Merchandisers
START UP / OPERATION
START UP
Follow the controller start up procedures as
detailed in Section 3 of this manual.
Each self-contained merchandiser has its
own evaporator coil and a preset thermostatic
expansion valve (TEV). The TEV has been
factory set at design conditions to provide the
recommended performance.
TEV ADJUSTMENT
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:
1. Attach a probe to the suction line near the
expansion valve bulb.
2. 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 to 5° F.
Make adjustments of no more than
½
turn of
the valve stem at a time and wait for at least 15
minutes before rechecking the probe temperature
and making further adjustments.
LOAD LIMITS
Each merchandiser has a load limit decal. Shelf
life of perishables will be short if load limit is
violated.
At no time should merchandisers be stocked
beyond the load limits indicated.
STOCKING
Product should NOT be placed inside the
merchandisers until merchandisers are at proper
operating temperature.
Allow merchandiser 24 hours to operate before
loading product.
Proper rotation of product during stocking is
necessary to prevent product loss. Always bring
the oldest product to the top and set the newest
to the bottom.
Air discharge and return flues must remain open
and free of obstruction at all times to provide
proper refrigeration and air curtain performance.
Do not allow product, packages, signs, etc. to
block these grilles. Do not use non-approved
shelving, baskets, display racks, or any accessory
that could hamper air curtain performance. Do
not allow product to be placed outside of the
designated load limits in the illustration above.
LOAD LIMIT
