Hussmann ASC-LG, Installation And Operation Manual

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ASC-LG / ASCS-LG-0506
6
Refrigeration Cont’d
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
refrigerator. 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 re-
frigerated overnight. Defrost times should as directed
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, defrost, fans,
temperature are controlled by Pagon ERC-2 con-
troller. See case specs 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 refrig-
eration 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 at the evapora-
tor outlet.
2. From a refrigerant pressure temperature chart,
determine the saturation temperature at the ob-
served 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.
5. The difference is superheat.
6. 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 illustration)
I n a l l c a s e s , t h e
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 floor.
Standard Case
T-Stat Location
Ballasts
Gelato Case
T-Stat Location