Russell AA28-134B Installation Manual
ALL-TEMP
INSTALLATION AND
MAINTENANCE MANUAL
Publication No. IOM 102.0
December, 2000
MODELS : AA, AE, AG, AH
AIR, ELECTRIC AND HOT GAS DEFROST
Inspection
When the equipment is received, check the quantity of cartons and crates against the bill of lading.
Inspect all containers for visible damage. Report any damage or shortages to the freight company
immediately. It is the customers responsibility to file all freight claims to the carrier.
Installation
Installation and maintenance are to be performed by qualified personnel who are familiar with local
codes and regulations. Installers should have previous experience with this type of equipment.
CAUTION: Avoid contact with sharp edges and coil surfaces.They are potential hazards.
Determine the best location for the unit in the walk-in cooler or freezer. (See system IOM 550) Place
the unit as far as possible from any door openings.This will help to prevent warm, moist air from
being drawn into the unit, reducing the potential for icing problems. All-Temp units are draw through
types, which discharge air directly from the fan into the room. Adequate clearances should be maintained to allow for proper air flow through the unit and to allow for regular maintenance and service.
Allow a minimum of 24” of clearance on all sides of the unit.
Remove all packaging materials before the unit is raised into position. Be certain that the unit is not
sitting on the drain fitting or refrigerant connections.The unit should be suppor ted on 3/8” minimum
thickness stainless steel support rods or fasteners at all hanging slots.The unit must be positioned
flush with the ceiling and all gaps properly caulked.
The drain line should be pitched a minimum of 4” per foot to allow proper drainage and should exit
the room as quickly as possible.Do not locate bends, elbows or drain traps within the refrigerated
space. Do not reduce the drain line size.All drain lines must be trapped outside of the enclosure
where the temperature is never below 35 degrees. Drain lines should run to an open drain and
should never be connected directly to a sewage or waste line.Drain lines may be heated and
insulated to prevent freezing.
C
Wiring
All wiring must be done in compliance with local and national codes. Use only Copper conductors.
Hot gas and electric defrost units are supplied with a temperature sensing defrost termination switch
which will end the defrost at a preset coil temperature. A high limit control is provided to prevent
overheating if there is a component failure. A fan delay control is installed to allow the coil temperature to drop below the freezing point of the water condensate on the fins before starting the fans.
See the unit rating label for electrical requirements.A unit specific wir ing diagram is located in the
end panel of the evaporator.
Typical wiring diagrams
Hot Gas
Defrost
Air Defrost
Electric
Defrost
208-230/1/60
Electric
Defrost
208-230/3/60
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