Hussmann ISLA IM-FH, Руководство по установке и эксплуатации

Страница: 13 / 26

HUSSMANN CORPORATION • BRIDGETON, MO 63044-2483 U.S.A.
PN_3034423_C 7
ISLA FOOD COUNTERS
10
Refrigeration (Contd)
Acc cess to TX V alves and Drain Li nes
Mechanical - Remove product from end of case.
Remove product racks. Remove refrigeration and drain
access panels (labeled). TX valve (mechanical only) and
drain are located under each access panel at end of the
case.
Electronic - The Electronic Expansion valve master and
slave cylinder(s) are located within the electrical access
panel(s).
Electronic Expansion valve (Optional)
A wide variety of electronic expansion valves and case
controllers can be utilized. Please refer to EEV and
controller manufacturers information sheet. Sensors
for electronic expansion valves will be installed on the
coil inlet, coil outlet, and in the discharge air. (Some
supermarkets require a 4th sensor in the return air).
Case controllers will be located in the electrical raceway
or under the case.
Thermostatic Expansion V alve Lo cation
This device is located on the same side as the
refrigeration stub. A Sporlan balanced port expansion
valve model is furnished as standard equipment, unless
otherwise specified by customer.
Expansion Ad justment
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 Su perheat
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 -S T A T Lo cation
T-STATS are located within the electrical raceway.