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IGSS-FMSS-0301
6
Refrigeration
REFRIGERANT TYPE
The standard refrigerant will be R-404 unless otherwise
specified on the customer order. Check the serial plate
on the case for information.
Piping for more than one case on a condensing unit is run
underground with either common suction and liquid lines
from the machine room or individual suction and liquid
lines joined together in the machine room.
REFRIGERATION LINES
LIQUID SUCTION
3/8" O.D. 5/8" O.D.
NOTE: The standard coil is piped at 5/8" (suction); however,
the store tie-in may vary depending on the number of
coils and the draw the case has. Depending on the case
setup, the connecting point in the store may be
5
/8",
7
/8", or 1
1
/8". Refer to the particular case you are
hooking up.
Refrigerant lines should be sized as shown on the refrig-
eration legend furnished by the store.
Install P-traps (oil traps) at the base of all suction line ver-
tical risers.
Pressure drop can rob the system of capacity. To keep the
pressure drop to a minimum, keep refrigerant line run as
short as possible, using the minimum number of elbows.
Where elbows are required, use long radius elbows only.
For refrigerators with KOOLGAS defrost, suction, and
liquid lines should not contact each other and should
be insulated for a minimum of 30' from the refrigera-
tor. 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 tempera-
tures. Product temperature should be measured first thing
in the morning, after having been refrigerated overnight.
Defrost times should as directed in the Case Specifica-
tions 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 loca-
tion.
CONTROL SETTINGS-Self Contained
On Self Contained cases all functions, defroat, fans, tem-
perature 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 con-
troller manufacturers information sheet. Sensors for elec-
tronic 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 VALVE LOCATION
This device is located on the same side as the refrigera-
tion stub. A balanced port expansion valve model is fur-
nished as standard equipment.
EXPANSION VALVE ADJUSTMENT
Expansion valves must be adjusted to fully feed the evapo-
rator. 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 operat-
ing 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