IGSF-ASC-L / ASCS-L-0308
6
Refrigeration Cont’d
SUCTION, AND LIQUID LINES SHOULD NOT
CONTACT EACH OTHER AND SHOULD BE INSU-
LATED FOR A MINIMUM OF 30' FROM THE REFRIG-
ERATOR. ADDITIONAL INSULATION FOR THE
BALANCE OF LIQUID AND SUCTION LINES IS
RECOMMENDED AND REQUIRED WHEREVER
CONDENSATION AND DRIPPING WOULD BE
OBJECTIONABLE.
CONTROL SETTINGS-REMOTE
See the “Case Specs” section of this guidebook for the
appropriate settings for your merchandiser. Maintain
these parameters to achieve near constant product
temperatures. Product temperature should be mea-
sured first thing in the morning, after having been
refrigerated overnight. Defrost times should as di-
rected in the Case Specifications section of this guide.
The number of defrosts per day should never change.
The duration of the defrost cycle may be adjusted to
meet conditions present at your location.
CONTROL SETTINGS-SELF CONTAINED
On Self Contained cases all functions, defroat, fans,
temperature are controlled by Pagon ERC-2 controller.
See case spects for proper temperature and defrost
settings.
ACCESS TO TX VALVES & DRAIN LINES
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 race-
way or under the case
THERMOSTATIC EXPANSION VALVE LOCATION
This device is located on the same side as the refrigera-
tion 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.
2. 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. 2 from the temperature measured in step No. 3.
3. The difference is superheat.
5. 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. ( See
diagram).
Standard Case
T-Stat Location
Ballasts
Gelato Case
T-Stat Location
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.
ATTENTION INSTALLER!
IT IS CONTRACTOR’S RESPONSIBILITY TO
INSTALL CASE(S) ACCORDING TO
LOCAL CONSTRUCTION AND HEALTH CODES!!
PIPING
The refrigerant line outlets are located under the
fixture at the left end when viewed from the back.
Insulate suction lines to prevent condensation dripping
on the
