Russell ASL25-46E Installation Manual

ASL
SLIM - TEMP
INSTALLATION AND
MAINTENANCE
MANUAL

Bulletin No. IOM 113.0

December, 2000

Inspection

When the equipment is received, t he number of crates
and cartons should be checked against the bill of lading
for possible shortages. Any damage should be noted
immediately and a report given to the carrier and the
HTP factory. It is the customer’s responsibility to file
all freight claims with the carrier. Unit name plates
should be checked to make sure voltages are in
agreement with the power available.

Installation

Installation and maintenance to be preformed by
qualified personnel who are familiar with the local codes
and regulations and who are experienced with this
type of equipment. Caution: Avoid contact with sharp
edges and coil surface as they are potential hazards.

The unit must be installed level for proper drainage.
This rear discharge unit, draws air up through the
fan blades and discharges out the coils length. Proper
clearances should be maintained for proper air flow
and service access to the unit as follows: 6” minimum
between each coil and wall. The unit should be
supported on #10 screws or 1/4” diameter bolts. To
meet NSF requirements, the unit must be positioned
flush with the ceiling and all gaps properly caulked.

Refrigerant Connections

Refrigerant connections should be installed in
accordance with all applicable codes and using good
refrigeration practices. A suction line trap must be
installed prior to any risers in the suction line. Horizontal
suction lines should be sloped to provide proper oil
return to the compressor. Suction lines should be
properly insulated to prevent sweating and higher retur n
gas temperatures.

Drain Line

The drain line should be sharply pitched and should exit
the enclosure as quickly as possible. The drain line
should be insulated and sealed where it passes through
the wall and trapped outside the refrigerated area and
protected from freezing. In room temperatures below
34° F, the drain line should be heated and insulated.

Wiring

Wiring should be done in accordance with all national
and local codes. Electric defrost units are supplied with
a temperature sensing defrost termination switch which
will terminate the defrost at a preset temperature. A fan
delay switch is also provided to allow the coil to cool
down prior to the fans turning on after defrost. The time
clock should be adjusted to have a maximum of a 30
minute override to prevent overheating and steaming of
the coils. The number of defrosts per day will be
determined by the usage of the box and the frost buildup
on the coils. On hot gas units, refer to the system
manufacturer’s recommendations.

Expansion V alve

Expansion valves are to be installed in accordance with
the specific manufacturer’s recommendations. Units that
require an external equalized expansion valve must
have that line connected. Proper location of the bulb is
extremely important to the performance of the coil.
Good thermal contact to the suction line is also essential.
On solder type valves, a wet cloth wrapped around the
valve during installation will protect it from overheating
and damage. Superheat settings should be checked
after the system has balanced out at the desired room
temperature. On systems sized for a 10° to 12°F TD, the
valve should be adjusted to maintain 5° to 6°F
superheat. Higher TD applications will allow a higher
superheat setting. On multiple evaporator systems, the
piping should be arranged such that the flow from any
valve cannot affect the bulb of an other.

General Maintenance

General maintenance involves an occasional cleaning of
dirt accumulation on the fan, fan guard or coil. The
motors are life lubricated and do not require any regular
maintenance.

Wiring Diagrams

Air Defrost Wiring

Electric Defrost Wiring