IGFP-R3H, R3HTO, R3HA, R3Combo-0208
6
suction lines to prevent condensation drippage.
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.
CONTROL SETTINGS
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 be as follows: OFF CYCLE - Con-
sult the Case Specification Section of this guide for de-
frost settings. The number of defrosts per day and the
duration of the defrost cycle may be adjusted to meet
conditions present at your location.
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.
The front Self Service Evaporator has an E.P.R. valve in-
stalled to maintain a constant discharge temperature. It is
located in the front at the right side of the case under the
fan plenum near the TX valve.
THERMOSTATIC EXPANSION VALVE LOCATION
This device is located on the same side as the refrigera-
tion stub. A Sporlan balanced port expansion valve model
is furnished as standard equipment, unless otherwise speci-
fied by customer.
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.
Evaporator Pressure Regulator
An Evaporator Pressure Regulator is installed in the front
of the self service section to maintain a constant discharge
temperature. It is located at the front right side of the
case, under the fan plenum near the TX Valve.
Service Case Temperature Control
Temperature control in the upper section of the R3 with
the Service Option is done by means of a thermostat and
suction solenoid valve. This controls both temperature and
humidity,
T-STAT LOCATION
T-Stats are located within the electrical raceway. Refer to
diagram below.
R3H
T-Stat &
Ballast
(Located in the
same place for
hot and cold)
Rear Storage
T-Stat and
Solenoid inside
Storage Area
Front Coils
controlled by
EPR Valve
under Deck Pan
(Right side)
Содержание Specialty Products R3H
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