Refrigeration; Refrigerant Type; Control Settings; Access To Tx Valves & Drain Lines - Hussmann RGSSFP Installation And Operation Manual

ing system floor drains should be at least 14" off the
center of the case to allow use of the P-trap pipe
section. Never use two water seals in series in any
one line. Double P-traps in series will cause a lock
and prevent draining.
3 . Always provide as much down hill slope ("fall") as
possible; 1/8" per foot is the preferred minimum.
PVC pipe, when used, must be supported to main-
tain the 1/8" pitch and to prevent warping.
4 . Avoid long runs of condensate drains. Long runs
make it impossible to provide the "fall" necessary for
good drainage.
5 . Provide a suitable air break between the flood rim of
the floor drain and outlet of condensate drain. 1" is
ideal.
6 . Prevent condensate drains from freezing:
a. Do not install condensate drains in contact with
non-insulated suction lines. Suction lines should
be insulated with a nonabsorbent insulation mate-
rial such as Armstrong's Armaflex.
b. Where condensate drains are located in dead
air spaces (between refrigerators or between a
refrigerator and a wall), provide means to prevent
freezing. The water seal should be insulated to
prevent condensation.

Refrigeration

REFRIGERANT TYPE

The standard refrigerant will be R unless otherwise
specified on the customer order. Check the serial plate on
the case for information.
PIPING - Remote Case Only
The refrigerant line outlets are located under the case.
Locate first the electrical box, the outlets are then on the
same side of the case but at the opposite end. Insulate
suction lines to prevent condensation drippage.
REFRIGERATION LINES
LIQUID
3/8" 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 hook-
ing up.
Refrigerant lines should be sized as shown on the
refrigeration legend furnished by the store.
Install P-traps (oil traps) at the base of all suction line
vertical 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.
SUCTION
5/8" O.D.

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 temperatures.
Product temperature should be measured first thing in
the morning, after having been refrigerated overnight.
For all multiplexing, defrost should be time terminated.
Loadmaster valves are not recommended. Defrost times
should be as follows: OFF CYCLE - Three times daily for
46 minutes. 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.
ACCESS TO TX vALvES & DRAIN LINES
MECHANICAL - Remove the product from the bottom deck
pan. Remove pan. Remove refrigeration and drain access
panels (labeled). TX Valve (mechanical only) and drain are
located under each access panel at the end of the case.
ELECTRONIC (Remote Only) - The Electronic Expansion
valve controller is located within the electrical access
panel(s).
ELECTRONIC EXPANSION vALvE (Remote Only)
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 vALvE LOCATION
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 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, de-
termine 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.
The difference is superheat.
5. Set the superheat for 5°F - 7° F.
Note: Slow air picks up more humidity from coil and ice.
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