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TABLE OF CONTENTS |
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SUBJECT |
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GENERAL INFORMATION ........................................................................... |
1 |
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INTRODUCTION ........................................................................................................ |
1 |
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INSPECTION .............................................................................................................. |
1 |
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LOCATION ................................................................................................................ |
1 |
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INSTALLATION............................................................................................................. |
1 |
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OPERATION.................................................................................................. |
1 |
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OPERATION .............................................................................................................. |
1 |
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DRAINS .............................................................................................................……. |
2 |
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REFRIGERATION ........................................................................................................ |
2 |
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HIGH PRESSURE CUT-OUT.......................................................................................... |
2 |
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TEMPERATURE CONTROL ……………….................................................................. |
2-3 |
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THERMOMETER ......................................................................................................... |
3 |
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ELECTRICAL .............................................................................................................. |
3 |
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DEFROST |
.................................................................................................................... |
3 |
USER INFORMATION…................................................................................................ |
3 |
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CLEANING ................................................................................................................ |
3 |
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SHELVING |
………...................................................................................................... |
3 |
LOADING |
………...................................................................................................... |
3-4 |
SERVICE ...................................................................................................... |
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4 |
EXPANSION ..................................................................................................VALVE |
4 |
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LAMPS ....................................................................................................................... |
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4 |
ALARMS ……............................................................................................................. |
4 |
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FIGURES ...................................................................................................... |
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5-8 |
FIGURE 1 |
SUMMARY OF PARAMETERS ....…..............................…………………... |
5 |
FIGURE 2 |
CHANGING PARAMETERS ...………………........................................…. |
6-7 |
FIGURE 3 |
DESCRIPTION OF THE MAIN ALARM SIGNALS….................................. |
8 |
WIRING DIAGRAMS..................................................................................... |
9-12 |
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FIGURE 4 |
OMC - LB……………….............................................................................. |
9 |
FIGURE 5 |
OMC - 36 & 48 .............................................................………………….... |
10 |
FIGURE 6 |
OMC - 72 ....................................................................…………………...... |
11 |
FIGURE 7 |
OMCSL48 .….............................................................…………………...... |
12 |
OMC-LB SPECIFICATION ..................................................................SHEET |
13 |
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OMC SPECIFICATION .......................................................................SHEET |
14 |
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OMC-SL-48 SPECIFICATION SHEET……………………………………………. |
15 |
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WARRANTY................................................................................................... |
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16 |
OMC-LB, OMC-36, OMC-48, OMC-72, OMCSL48 03035
GENERAL INFORMATION
Introduction
The information contained in this manual pertains to the self-contained open display merchandisers: OMC-LB, OMC-36, OMC-48, OMC-72, and OMCSL48. These merchandisers are ideal for showcasing prepackaged food products in a safe manner. These display coolers were designed to operate in an airconditioned store where the temperature is maintained at 75°F or lower and the relative humidity is 55% or lower.
Inspection
These display coolers were carefully factorytested, inspected and properly packed to ensure delivery in the best possible condition. The equipment should be uncrated and checked for damage immediately upon delivery. ALL CLAIMS FOR DAMAGES MUST BE
FILED WITH THE TRANSPORTATION COMPANY - NOT WITH ZERO ZONE. The carrier will supply necessary report and claim forms.
Location
Position the OMC-LB and OMC units at a minimum of 3-1/2” from walls and other objects that may impede the circulation of air around the exterior of the case. The wall bumper stops supplied for the rear of the OMC-LB and OMC coolers must always remain attached. The OMCSL48 is designed for placement within a lineup of gondola shelving and does not require wall bumper stops.
Do not locate this equipment where it will be exposed to the direct rays of the sun or near a source of radiant heat.
Do not install the display case near doors or areas exposed to air currents.
Do not stack cartons or packaging around the unit that might restrict air circulation to and from the air-cooled condensing unit.
FAILURE TO OBSERVE THIS MAINTENANCE PROCEDURE COULD CAUSE A SIGNIFICANT DECREASE IN REFRIGERATION PERFORMANCE AND INCREASED RUNNING COSTS.
Installation
OMC-LB, OMC-36, OMC-48 and OMC-72 merchandisers must be taken off of the shipping skid and plugged into the proper electrical receptacle. Additionally, because of its shallow profile, the OMCSL48 must be anchored to the shelving uprights or similar support using the brackets shipped with the unit.
OPERATION
Operation
Table 1 on page 4 lists the case model with power and electrical receptacle requirements.
The power switch on the OMC and OMC-LB is located behind the lower front air grill. On the OMCSL48 the power switch is located behind the light box, accessible over the top of the cabinet. The power switch should be off before plugging or unplugging the case. Initially, the evaporator and condenser fans (one on the OMC-LB & OMC-72) will run without the refrigeration compressor(s). After a delay of two minutes, the compressor(s) will start and the case will begin to cool.
All stock must enter the cabinet pre-chilled.
Do not operate with lower rear vent panel removed. This panel has been specifically designed to disperse moisture from the drain tank.
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OMC-LB, OMC-36, OMC-48, OMC-72, OMCSL48 |
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03035 |
Drains
It is important that the condensate drainage system be kept clear of any obstructions.
Obstructions can be in the form of foreign objects such as loose stock items, dislodged price tags, product labels, etc. Because this cabinet circulates refrigerated air, the entrance of environmental borne dust particles is inevitable. These particles can accumulate in the drainage system and eventually form sludge.
Condensate water drains into a tank, which is designed to evaporate the water. To remove the tank, switch off the power supply, remove the lower front air grill, unplug the electrical socket and slide the tank out the front of the cabinet.
WHEN CLEANING, THE TANK SHOULD NOT BE IMMERSED IN WATER, AS ELECTRICAL COMPONENTS COULD BE DAMAGED
It is recommended that the condensate drainage system be thoroughly cleaned on a 6- month basis. The need for this may be more frequent, depending on environmental conditions.
Refrigeration
All OMC cases are supplied with a selfcontained refrigeration system. The units are factory charged with POE oil and R404a refrigerant.
Refrigerant charges are as follows:
OMC-36 |
3.86 lbs |
OMC-48 |
4.40 lbs |
OMC-72 |
(2) 3.86 lbs ea. |
OMC-LB |
3.86 lbs. |
OMCSL48 |
5.00 lbs. |
All valves and adjustments to the refrigeration system have been preset for operation by the factory. No additional adjustments are necessary once the case is installed.
To protect the compressor from damage, the condensing unit is supplied with a low-pressure safety cut out and a high-pressure safety cut out. The low-pressure cut out is self-resetting and has a non-adjustable setting of 5 PSIG. The highpressure cut out is manually reset (see service section), and has a non-adjustable setting of 410 PSIG.
High Pressure Cut-Out
On the OMC and OMC-LB, the high pressure cut-out is located adjacent to the condenser coil, behind the lower front air grill. To access the control, remove the lower front air grill by lifting up and away from the cabinet. To reset, press the red button on the control. The highpressure control is set at 410 PSIG located in the discharge line. On the OMCSL48, the control is located on the side of the electrical box on top of the cabinet behind the light box. This is accessible from the top of the cabinet.
Temperature Control
A microprocessor controller is mounted behind the lower front air grill and is accessed by removing the air grill on the OMC-LB, 36, 48 and 72. The controller for the OMCSL48 is located on the electrical box behind the light box, accessible over the top of the cabinet.
This controller has many functions including a temperature control and a defrost control. It has been factory set for your application and has different factory settings for various product applications.
If you want to change the case operating temperature, a qualified refrigeration technician will be able to change the set points. There are different operating temperatures depending on which product is to be displayed in the case. There are three general product operating temperature options offered in Figure 1. The descriptions include; Meat, General Purpose (Factory Setting), and Fresh Cuts. Figure 1 also includes all the preprogrammed parameters of the twin probe temperature control. Figure 2 provides instructions for changing these and
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OMC-LB, OMC-36, OMC-48, OMC-72, OMCSL48 |
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03035 |
other parameters in the case. Figure 3 lists descriptions of the main alarm signals.
Thermometer
The thermometer is mounted at the left-hand lower front of the case. This allows the customer and operator to read refrigerated air temperature. Allow a minimum run time of 1 hour to achieve accurate temperature readings.
Electrical
Figures 4-8 show typical wiring diagrams. The light switch for the sign of the OMC and OMCSL48 cases is on top of the unit. The light switch for the OMC-LB case is located on the bottom of the light box.
Defrost
The OMC case has an automatic defrost control, which has been factory set. The defrost cycle is every 4 hours and terminates on temperature. The case uses off cycle air defrost. The compressor is turned off and the evaporator fans continue to run to melt frost from the coil. The condenser fans (1 fan on OMC-LB and 72) run during defrost except the OMCSL48 condenser fan, which does not run during defrost.
USER INFORMATION
Cleaning
The condenser fins on the OMC, OMC-LB and OMCSL48 cases must be cleaned a minimum of every 3 months.
Remove the lower front air grill by lifting up and away from the cabinet. Remove dust and lint using a brush or vacuum cleaner. Replace grill. On the OMCSL48, the face of the condenser is behind the light box, accessible over the top of the cabinet, which makes it always available for routine cleaning. No disassembly is required for this unit.
FAILURE TO OBSERVE THIS MAINTENANCE PROCEDURE COULD CAUSE A SIGNIFICANT DECREASE IN REFRIGERATION PERFORMANCE, COMPRESSOR DAMAGE AND INCREASED RUNNING COSTS.
To allow the refrigeration system to operate efficiently, the OMC and OMC-LB cabinets should be positioned with a minimum of 3-1/2” clearance from the rear wall. The wall bumper stops supplied for the rear of these units must always be attached to maintain this spacing. The OMCSL48 does not require a wall bumper for proper performance.
The cooler should be thoroughly cleaned before start-up and routinely thereafter to maintain a clean appearance. Use mild detergent (NEVER AN ABRASIVE CLEANER) and warm water to wipe out the inside of the cooler. Clean all glass with glass cleaner. The cooler will remain bright and sparkling with just a few minutes of cleaning each week. The case drain should be regularly cleared of debris and price tags.
NOTE: Do not use high-pressure water or steam to clean the interior.
Shelving
All OMC units have adjustable height shelves, which can be mounted horizontally or angled downward at front. When replacing shelves, ensure that the rear of the shelf is locked into the recess in the shelf bracket.
Loading
When loading the display case, the following points must be taken into consideration:
•Do not exceed the load limit as marked on the case.
•When restarting the display case after a prolonged shut down, the case should be left to operate empty for at least one hour before loading with pre-cooled product.
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OMC-LB, OMC-36, OMC-48, OMC-72, OMCSL48 |
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03035 |
•Leave space between the stock to allow the refrigerated air to circulate.
•The air inlet at the lower front of the case and back wall or front grill discharge should never be obstructed.
•Product with a temperature higher than the display case should not be introduced.
SERVICE
Expansion Valve
All OMC cases have an evaporator coil located below the bottom coil cover. The OMC and OMCSL cases also have an evaporator coil located behind the perforated rear wall. Each coil has its own expansion valve set for 15-20°F superheat. Bottom TXV superheat should be lower than top superheat.
Lamps
The lamps are located behind the sign. Before servicing the lamps, turn off the lamp switch. The lamps in the OMC-LB and OMC cases are accessed by removing the screws on the top of the case and rotating the sign forward. Rotate the sign slowly to expose the lights. The lamps on the OMCSL48 can be serviced by removing the retaining bracket at the top front of the light box and sliding the sign up and out of the box channel.
Alarms
Figure 3 describes the main alarm signals.
Table 1
OMC-LB: 115V-1 PHASE-60Hz, 20A Straight 3-blade electrical receptacle
OMC-36: 115V-1 PHASE-60Hz, 30A Straight 3-blade electrical receptacle
OMC-48: 115V-1 PHASE-60Hz, 30A Straight 3-blade electrical receptacle
OMC-72: 208/230V – 115V -1 PHASE-60Hz, 30A NEMA L-14-30 twist lock electrical receptacle
OMCSL48: 115V-1 PHASE-60Hz, 30A Straight 3-blade electrical receptacle
4 |
OMC-LB, OMC-36, OMC-48, OMC-72, OMCSL48 |
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03035 |
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