hussmann FMSS-L - Manual (Page 10)

igss-fMss-l-0708
10
thermostatic expansion valve location
This device is located on the same side as the refrigeration
stub. An Alco balanced port expansion valve model
is 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.
Measuring the operating superheat
1. Determine the suction pressure with an accurate
pressure gauge at the evaporator outlet.
. 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.  from the temperature measured in step No. 3.
5. The difference is superheat.
6. Set the superheat for 5°F - 7°F.
t-stat location
Thermostats are located within the electrical raceway.
The raceway location is dependent on the style of the
front panel and whether the case is going to be pushed
up against a wall.
Front of Case
Ballast location
Ballast and T-stat are located in the front right hand area
of the case, viewed from customer angle.
In all cases, the thermostat is located on the same side of
the case. If you are looking at the case from the front, it is
the right-hand side. If you are looking at the case from the
back, it is the left-hand side.
It is the contractor’s responsibility to install
case(s) according to local construction and
health codes.
refrigeration (Cont'd)