Master-Bilt BSD-24SFA Installation Manual

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BSD SERIES

REFRIGERATORS AND FREEZERS

Installation, Operation and

Maintenance Instructions

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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 at 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

If casters are installed, care should be taken when removing the unit from the crate base.
The unit is heavy and can present a hazard if not handled with care. Remove the unit
crate and crate base. Discard hardware used to secure the cabinet to the crate base.
Ensure that at least two persons are available to install the casters. Lay the cabinet on its
back to create access to the cabinet bottom. Attach the casters to the cabinet base suing
the factory installed screws as shown below.
Remove the ¼ x 20 x ¾ screws (4 per caster)
that are factory installed. Position the caster
and reinstall. Ensure that the locking casters
are installed on the front of the cabinet. After
installation is complete, return the cabinet to its
upright position. The cabinet should set in the
upright position for at least one hour prior to
energizing. This is required to allow the
refrigeration to settle to its normal state. The
cabinet should also be leveled when it is placed
in its permanent location.

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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.

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.

FREEZERS

After shutting the door on freezer models, a short amount of time must be allowed before
the door can be reopened. This is due to the tight seal maintained between the door and
the cabinet. Waiting a few moments for the pressure to equalize permits the door to be
opened easily.

A positive defrost is required to remove frost from the coil in freezer models. This is
accomplished by energizing heaters during the defrost cycle that are positioned on the
coil surface. The programmable controller is factory set to allow four defrosts per day.

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As the preset defrost time is reached, the controller automatically terminates the
refrigeration process by turning off the condensing unit and unit cooler fan motors, and
energizes the defrost heaters. As the coil temperature increases, the frost begins to melt
producing water which runs down the coil to the unit cooler drain pan and exits through
the drain tube to the vaporizer. After all the frost has been removed and the coil
temperature reaches approximately 50°F [10ºC], the defrost is terminated through the
action of the defrost termination control located on the unit cooler, and the refrigeration
process resumes. In order to insure that any excess water remaining on the coil is not
sprayed into the cabinet interior, and all heat generated by the defrost is removed, the

unit cooler fans will not operate until the coil temperature reaches approximately
25°F [-4ºC].

GENERAL MAINTENANCE

PERIODIC CLEANING

Beginning with the initial installation, the interior surfaces of the cabinet should be
periodically wiped down with a solution of warm water and baking soda. This solution will
remove any odors from spillage that has occurred. The exterior of the cabinet should also
be cleaned frequently with a commercial grade of glass cleaner.

Monthly cleaning of the condenser will aid the heat transfer characteristics of the
refrigeration system and increase its efficiency. To accomplish this, remove the cover
panel from the cabinet and use a wire brush to loosen any dirt particles that are attached
to the fins. Use a vacuum cleaner to remove the loosened particles. Failure to keep the

condenser coil clean and clear of obstructions could result in temperature loss
and damage to the compressor.

All moving parts have been permanently lubricated and will generally require no
maintenance.

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MAINTENANCE SERVICE AND ANALYSIS GUIDE

REFRIGERATION SYSTEMS - ALL MODELS

MALFUNCTION POSSIBLE CAUSE SOLUTION

Compressor will not start - 1. Service cord unplugged 1. Plug in service cord
no hum 2. Fuse blown or removed 2. Replace fuse

3. Overload tripped 3. Determine reasons and correct

4. Control stuck open 4. Repair or replace

5. Wiring incorrect 5. Check wiring against the diagram

Compressor will not start - 1. Improperly wired 1. Check wiring against the diagram
hums but trips on overload 2. Low voltage to unit 2. Determine reason and correct
protector 3. Starting capacitor defective 3. Determine reason and replace

4. Relay failing to close 4. Determine reason, correct or replace

Compressor starts and runs, 1. Low voltage to unit 1. Determine reason and correct
but short cycles on overload 2. Overload defective 2. Check current, replace overload protector
protector 3. Excessive head pressure 3. Check ventilation or restriction in
refrigeration system 4. Compressor hot-return gas hot 4. Check refrigerant charge, fix leak if necessary

Compressor operates long 1. Short of refrigerant 1. Fix leak, add charge
or continuously 2. Control contact stuck 2. Repair or replace

3. Evaporator coil iced 3. Determine cause, defrost manually

4. Restriction in refrigeration system 4. Determine location and remove restriction

5. Dirty condenser 5. Clean condenser

Compressor runs fine, but 1. Overload protector 1. Check wiring diagram
short cycles 2. Cold control 2. Differential too close - widen

3. Overcharge 3. Reduce charge

4. Air in system 4. Purge and recharge

5. Undercharge 5. Fix leak, add refrigerant

Starting capacitor open, 1. Relay contacts stuck 1. Clean contacts or replace relay
shorted or blown 2. Low voltage to unit 2. Determine reason and correct

3. Improper relay 3. Replace

Relay defective or burned out 1. Incorrect relay 1. Check and replace

2. Voltage too high or too low 2. Determine reason and correct

Refrigerated space too warm 1. Control setting too high 1. Reset control

2. Refrigerant overcharge 2. Purge refrigerant

3. Dirty condenser 3. Clean condenser

4. Evaporator coil iced 4. Determine reason and defrost

5. Not operating 5. Determine reason, replace if necessary

Standard temperature system 1. Control setting is too low 1. Reset the control
freezes the product 2. Control points stuck 2. Replace the control

Objectionable noise 1. Fan blade hitting fan shroud 1. Reform or cut away small section of shroud

2. Tubing rattle 2. Locate and reform

3. Vibrating fan blade 3. Replace fan blade

4. Condenser fan motor rattles 4. Check motor bracket mounting, tighten

5. General vibration 5. Compressor suspension bolts not loosened
on applicable models - loosen them

6. Worn fan motor bearings 6. Replace fan motor

Pan Area 1. No cooling 1. Make sure switch is in the "on" position

2. Too cold 2. Adjust temperature control - see instructions
under pan area

3. Too warm 3. Adjust temperature control - see instructions
under pan area

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