Standex NR522SSG/0R, NR241SSG/0R, NR522SSS/0R, NR524SSS/0R, NR524SSG/0R Installation, Operation And Maintenance Instructions

1 06/11 Rev. B 127717

REFRIGERATORS AND F REEZERS

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.

VAPORIZER INSTALLATION

Some of the Refrigerators and all of the 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. The Freezers,
Pass-Thru and Roll-In Refrigerators use a hot gas vaporizer. Customer installation is not
required.

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2 06/11 Rev. B 127717

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.

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.

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3 06/11 Rev. B 127717

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.

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].
Note: Running a cold wall model freezer in an unconditioned environment may result in frost

build-up inside the cabinet.

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.

The shelving and pilasters should be periodically cleaned. The shelving should be removed
from the cabinet interior and washed with warm water and mild detergent using a soft bristle
brush or may be washed in a dishwasher large enough to accommodate the shelving size.
Pilasters may be removed from the cabinet interior by using a Philips screwdriver. Unscrew the
Philips head screws securing the pilasters to the cabinet interior walls. Retain the screws in a

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4 06/11 Rev. B 127717

secure place for re-installation. Wash the pilasters with warm water and a mild detergent in a
suitable place suitable for this effort such as a deep sink. A soft bristle brush is recommended
to reach the interior area of the pilasters. Re-install the pilasters and shelving when the
cleaning procedure is complete.

Drain connections to the evaporator pan and the evaporator pan should be periodically
cleaned to prevent any build up of debris, fungi, etc. See the cleaning instructions on the
following page (B13351).

See the instructions below for cleaning the evaporator drain pan.

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

Door hinges should also be periodically cleaned. The door(s) must be removed to gain
adequate access to the hinges. See the illustrations on next page for solid door and glass door
removal.

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5 06/11 Rev. B 127717

SOLID DOOR REMOVAL FOR HINGE CLEANING

1. Open door to stay position, locate top hinge of door.

2. Remove screws for hinge.

After screws are removed, grasp top hinge firmly and

allow the hinge bracket to close to the door.

!!CAUTION!! Hinge under high tension Pinch point hazard

3. Once tension has been removed lift door up to

remove. Wipe area clean with mild soap, do not
use abrasives.

4. Reverse steps to re-install.

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6 06/11 Rev. B 127717

GLASS DOOR REMOVAL FOR HINGE CLEANING

1. Open door, locate door heater power cord (if

applicable) and remove screw.

2. Remove black

spacer clip.

3. Pry open hinge stay to clear stop pin.

4. Locate hinge tension tool (Taped on door upon delivery).

Insert tool in spring notch on bottom of door, push

toward cabinet and then release front trigger. Skip this
step for doors with full length handles.

5. Once tension has been removed lift door up to remove.

6. Remove screws for

hinge.

7. Wipe clean with

mild soap.

Note: reverse process to install door.

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7 06/11 Rev. B 127717

MAINTENANCE SERVICE AND ANALY SIS 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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Model

BTU @ 100°F Solid Dr

& 86°F Glass Dr

Refrig't Voltage Amps Exp valve

ELEC

VAPORIZER

NR241SSS/0R

850 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

NR241SSG/0R

1260 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

NR242SSS/0R

850 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

NR242SSG/0R

1260 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

NR522SSS/0R

1580 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

NR522SSG/0R

2450 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

NR524SSS/0R

1580 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

NR524SSG/0R

2450 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

NR803SSS/0R

2250 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

NR803SSG/0R

3580 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

NR806SSS/0R

2255 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

NR806SSG/0R

3580 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

PR242SSS/0R

925 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

PR242SSG/0R

1860 @ +28°F EVAP

R134a 115/60/1 0.53 YES NO

PR524SSS/0R

1715 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

PR524SSG/0R

3655 @ +28°F EVAP

R134a 115/60/1 0.9 YES NO

PR806SSS/0R

2170 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

PR806SSG/0R

5110 @ +28°F EVAP

R134a 115/60/1 1.1 YES NO

WR331SSS/0R

1370@ +28°F EVAP

R134a 115/60/1 0.76 YES NO

WR722SSS/0R

2635@ +28°F EVAP

R134a 115/60/1 1.36 YES NO

PWR332SSS/0R

1500@ +28°F EVAP

R134a 115/60/1 1.0 YES NO

PWR724SSS/0R

2875@ +28°F EVAP

R134a 208-230/60/1 1.82 YES NO

NF241SSS/0R

1820 @ -10°F EVAP

R404a 115/60/1 4.7 YES NO

NF242SSS/0R

1820 @ -10°F EVAP

R404a 115/60/1 4.7 YES NO

NF522SSS/0R

2855 @ -10°F EVAP

R404a 115/60/1 6.9 YES NO

NF524SSS/0R

2855 @ -10°F EVAP

R404a 115/60/1 6.9 YES NO

NF803SSS/0R

3505 @ -10°F EVAP

R404a 115/60/1 7.4 YES NO

NF806SSS/0R

3505 @ -10°F EVAP

R404a 115/60/1 7.4 YES NO

NX211SSS/0R

3015@ -35°F EVAP

R404a 115/60/1 7.2 YES YES

NX211SSG/0R

4140 @ -35°F EVAP

R404a 115/60/1 7.2 YES YES

NX482SSS/0R

3520 @ -35°F EVAP

R404a 115/60/1 11.6 YES YES

NX482SSG/0R

5835 @ -35°F EVAP

R404a 115/60/1 11.6 YES YES

NOTES:

1) Cord and plug are not supplied with these units

2) Compressor size to be determined by a qualified refrigeration technician based on the delivered BTU rating
at the unit and actual jobsite requirements.

3) BTU rating shown is the required BTU's at the evap coil.

4) Standard five year compressor warranty does not apply to these units.

5) Condensate removal is the responsibility of the customer. A short drain line exiting the unit cooler section on
the top of the cabinet is provided for the purpose of extending.

6) Legs are standard on remote systems as they are generally hard piped to the condensing unit.

7) The solenoid valve mounted on the cabinet is factory wired to the control. No connections are required between
the cabinet and the remote compressor.

REMOTE REFRIGERATION DATA

8 06/11 Rev. B 127717

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