Master-Bilt MPWR332 Operator’s Manual

REFRIGERATORS AND FREEZERS

Installation, Operation and

Maintenance Instructions

INSPECTION

When the equipment is received, all items should be carefully checked against the bill of
lading to insure all crates and cartons have been received. All units should be inspected
for concealed damage by uncrating the units immediately. If any damage is found, it
should be reported to the carrier at once, and a claim should be filed with the carrier. This
equipment has been inspected and tested in the manufacturing facility and has been crated
in accordance with transportation rules and guidelines. Manufacturer is not responsible for
freight loss or damage.

INSTALLATION

GENERAL

After the unit crate and crate base have been removed, locate the casters or legs found
inside the cabinet. (Not applicable for Roll-In models). Attach the casters or legs to the unit
base by screwing them into the same threaded fittings that were used to secure the crate
base to the cabinet. Insure that the legs or casters are screwed completely into the base.
The cabinet should also be levelled when it is placed in its permanent location.

For shipping purposes, the condensing unit compressor is secured on the extra low

temperature models. Remove the spring clips and loosen the mounting bolts prior to
operation. See the label attached to the condensing unit.

If the doors are out of alignment on the cabinet, the doors can be adjusted. This can be
accomplished by opening the door(s) and loosening the screws that hold both the top and
bottom hinges to the cabinet. After adjusting the door so that it is aligned correctly, tighten
the screws to securely hold the hinges in place.

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VAPORIZER INSTALLATION

Refrigerators and Extra Low Temperature Freezers require the installation of
the condensate vaporizer which is shipped inside the unit compartment. The vaporizer
should be mounted to the cabinet bottom. Reference View 1. In lieu of the vaporizer, these
units can be plumbed to a floor drain following local plumbing codes. Freezers,
Pass-Thru and Roll-In Refrigerators use a hot gas vaporizer. Customer installation is not
required.

Note: Disconnect power prior to installation.

1. Connect the power cord to the vaporizer and place it in the vaporizer bracket.

2. Attach the vaporizer bracket to the back of the unit using the four screws as shown,
making sure the plastic drain tube is in the vaporizer pan.

View 1

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LOCATION

The refrigeration system located at the top of the cabinet requires free air access for proper
operation. Allow a minimum four (4) inch clearance on the top, rear, and sides of the
cabinet. The cabinet should also be levelled when it is placed in its permanent location.
There are no provisions for easily levelling the Roll-In models except by the use of shims.
Only minimal shimming is allowable. A cabinet that will sit directly on the floor without
casters should be levelled when placed in its permanent location. If casters are not used,
it is required by NSF that the cabinet be sealed to the floor with an approved sealant such
as Dow Corning #732 silicone.

ELECTRICAL

Check the proposed outlet to be used to insure that the voltage, phase and current carrying
capacity of the circuit from the electrical panel correspond to the requirements of the
cabinet. NEVER use an extension cord to wire any unit. On permanently connected units,
those not furnished with a plug-in service cord, all inter-wiring between the electrical panel
and the unit must be done in accordance with the National Electric Code and all state and
local codes. Refer to the serial tag for all pertinent electrical information.

Observe all Warning Labels. Disconnect power supply to eliminate injury from
electrical shock or moving parts when servicing equipment.

GENERAL OPERATION

The refrigerators and freezers employ a unit cooler evaporator located outside the cabinet
as the heat removing source. Through the refrigeration process, heat is captured in the
evaporator, transferred to the condensing unit on top of the cabinet, and expelled to the
surrounding outside air. It is extremely important to allow a four (4) inch clearance on the
top, rear, and sides of the unit for the refrigeration process to function properly.

These refrigerators and freezers utilize a programmable controller to control the
temperature and defrost settings. The controller, which is located on the facade of
the unit, is factory set. Please see the default settings sheet and separate
instructions that are included on the operation of this controller.

REFRIGERATORS

During the operation of a refrigerator unit, frost will periodically form on the coil surface.
Each time the compressor cycles "off", the evaporator fans will continue to run, which will
keep the internal temperature uniform and at the same time remove any frost build up on
the coil. The water produced will collect in the unit cooler drain pan and travel down the
drain tube to the condensate vaporizer.

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