Materials Storage and Shrink-Fitting Freezers
Universal Product Manual
Safety Summary
The following are general safety precautions that are not related to any specific procedures and therefore do not appear elsewhere in this document. These are recommended precautions that personnel must understand and apply during many phases of operation and maintenance. Operating personnel must observe all safety regulations at all times.
Keep Away from Live CircuitsDo not replace components or make adjustments inside the equipment with the high-voltage supply turned on. Under certain conditions dangerous potentials may exist even when the power control is in the OFF position, due to charges retained in capacitors. To avoid casualties always remove power and discharge and ground a circuit before touching it.
Do Not Service or Adjust AloneUnder no circumstances should any person reach into or enter the enclosure for the purpose of servicing or adjusting the equipment except in the presence of someone who is capable of rendering aid.
The following warning and cautions appear in the text in this document but are repeated here for emphasis.
- Do not remove hinges from doors.
- Make sure the electrical supply matches the requirements specified on the equipment’s data plate.
- Be sure power is being supplied to the equipment in a continuous circuit.
- The voltage supply should not vary more than plus or minus 10% of the required operating voltage.
- Do not turn or change any valves or control settings.
- Do not use sharp pointed scraping devices, wire brushes, or abrasive cleaners.
- Disconnect the condensing unit from the power line before working around the condenser.
General Theory of Operation
The control of a constant and correct temperature in a cabinet depends on the intermittent circulation and evaporation of a fixed supply of refrigerant in the evaporator.
With the temperature control’s sensitive feeler bulb element located inside the cabinet, the motor compressor pumps the heat laden vapor out of the evaporator, down the suction line and into the compressor. This low pressure vapor is sucked into the cylinders, compressed and forced out through the discharge valves, as a high pressured vapor, into the condenser.
The system from the expansion valve outlet to the discharge valve in the compressor is called the low pressure side of the system.
As the high pressure vapor enters the condenser, the high temperature vapor loses it’s heat to the air cooled condenser. The results in the high pressured vapor being condensed into a liquid refrigerant. This liquid then passes through the liquid line into the evaporator.
The part of the system from the discharge valve, through the condenser and liquid line, to the inlet of the expansion valve, is called the high pressure side of the system.
The liquid refrigerant in the evaporator is subject to a much lower pressure, due to the suction of the compressor; therefore evaporation of the liquid refrigerant takes place at a reduced pressure and temperature with the result that heat is removed from the refrigerated area. As the pressure and temperature in the evaporator is being lowered by the compressor suction, a point is reached where sufficient heat has been removed from the refrigerated area to lower the temperature to a point where the temperature control will break the electric circuit and stop the compressor. The lowered suction pressure will rise again, when the temperature in the cabinet rises and the temperature control senses this, it turns the compressor back on and repeats the entire process again.
Installation / Un-crating:
All refrigerators and freezers are strongly crated to insure delivery in good condition under ordinary handling by commercial carriers. However, it is important that inspection for possible damage in transit be made immediately upon receipt of the unit.
Any visible damage to the crate, or to the unit itself should be noted on the carrier delivery receipt. This signifies that a claim for damages will be made.
Removal of Door
:If for any reason the door has to be removed, remove the hinge covers and then remove the screws holding the hinge and door to the face of the refrigerator.
Do not remove hinges from the doors.
Location
It is important that there is free circulation of dry, cool, clean air around the refrigerator or freezer. Obtain best ventilation possible. Keep the unit at some distance from furnaces, ovens, etc. Avoid locations where the room temperature will drop below the temperature to be maintained in the refrigerator. Keep at least 3” clearance at the back, and at each end to allow for best ventilation.
Leveling
When the refrigerator or freezer is in proper position, make sure it is sitting level from side to side and from front to rear.
Door Seal:Close door(s) and check each door for proper gasket seal. The gasket should seat on the front surface of the unit, this is to prevent leakage or air into the refrigerator or freezer. If adjustment is necessary, loosen the door strike located on the body of the unit. Move strike outward to decrease gasket pressure, move strike inward to increase pressure. Move the strike in or out a bit at a time. When proper adjustment has been made, be sure the holding screws are tightened.
Proper adjustment can be determined by inserting a piece of paper between the door gasket and the front door gasket hitting surface. Paper should indicate drag completely around door.
Shelves:
Shelves are supported on small brackets called pilaster clips, which are set into vertical pilaster strips fastened to the walls of the refrigerator. Each shelf is supported by four (4) pilaster clips. Pilaster clips are loosened by raising the bottom part up and out and may be moved up or down to adjust the height of the shelf on 1/2” spacing.**The holes at the same level have a corresponding number to permit quick and easy shelf adjustment.
Power Requirements:
The unit is now ready to be connected to a suitable power outlet.
Check the electrical requirements on the identification plate. Make sure the power being supplied is the same as is on the identification plate.
Be sure that the power line to which the refrigerator or freezer is connected, is a continuous circuit, and cannot be accidentally cut off or controlled by some type of time switch cut off. Obtain a separate circuit for proper operation of the unit.
For satisfactory operation, the voltage supply should not vary more than plus or minus 10% of the required operating voltage.
Starting the Compressor:Do not turn or change any service valve or control setting.
All service valves are left in the open position, on self contained, hermetically sealed systems, during the test run, before being shipped from the factory. Connect the electrical current to the junction box located in the unit compartment.
Next, check the electrical supply to be sure that power is being received at the junction box by using a test light. If current is being received, the test light will light up. The unit is now ready to start. Move the switch to the “ON” position.
Controls and Adjustments:
All controls are factory set for proper operation. They should not be changed unless it is shown by use of an accurate thermometer that the cabinet is not holding correct operating temperatures.
Operation / Loading
:It is important that the refrigerator or freezer is not loaded with perishables until the inside temperature has been brought down to the proper operating level. After starting the refrigeration unit, allow it to operate for about four (4) hours before loading.
Do not overload—leave room for circulating cool air.
Maintenance:
Cleaning Exterior and/or interior (Stainless Steel) wash with a mild soap solution, rinse with clean water, wipe dry with a clean soft cloth.
Do not use abrasive cleaners.
About once a month, clean door gasket with a mild soap and water solution. Be sure to wipe thoroughly dry.
Disconnecting
If the refrigerator or freezer is not to be used for an extended period of time, disconnect the electric plug and open the doors. As soon as the unit has had a chance to warm up to room temperature, wipe all parts dry. Leave all doors open and later check to see that no moisture has collected on any of the parts.
Condensers
Disconnect the condensing unit from the power line before working around the condenser.
It is important that there is a free circulation of air around and through the condenser. The condenser must be kept clean at all times. Unsatisfactory operation will result from failure to observe these points. Inspect the condenser frequently, clean dust and other obstructions from the condenser with a vacuum cleaner or soft wire brush. Do not use a hard wire brush!
RTF Manufacturing Company, LLC
793 Route 66 - Hudson, NY 12534
Call: 518-828-2180 | Email: [email protected]
793 Route 66 - Hudson, NY 12534
Call: 518-828-2180 | Email: [email protected]
