Installation and Operations Manual
Unit Cooler Mounting
Most evaporators can be mounted with rod hangers, lag screws, or bolts. Use 5/16" bolt and washers or rod for up to 250 pounds, 3/8" for up to 600 pounds and 5/8" for over 600 pounds. Care should be taken to mount the units level so that condensate drains properly. Note that some unit cooler designs achieve drain pan slope by using different height mounting brackets. In this situation, the top of the mounting brackets should be level. Adequate support must be provided to hold the weight of the unit.
When using rod hangers, allow adequate space between the top of the unit and the ceiling for cleaning. To comply with NSF Standard 7,
the area above the unit cooler must be sealed or exposed in such a way to facilitate hand cleaning without the use of tools. When lagging or bolting the unit flush to the ceiling, seal the joint between the top and theceilingwithanNSFlistedsealantandendsofopenhangerchannels must be sealed to prevent accumulation of foreign matter.
When locating unit coolers in a cooler or freezer, refer to Figures 1 through 4 for guidelines.
NOTE: Always avoid placement of Unit Coolers direct above doors and door openings.
Figure 4. Large Coolers and Freezers Placement.
Cooler or Freezers |
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where one wall will not |
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accommodate all required |
| Baffle | |
evaporators or where air | Cooler or Freezer with Glass | ||
Glass | |||
throw distance must be | Display Doors | ||
considered. |
| Display | |
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| Door | |
Baffled Unit - | Allow sufficient |
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Where one wall evaporator | space between rear of Unit Cooler | Elevation view of glass display | |
and wall to permit free return of | |||
mounting is satisfactory. | |||
door cooler or freezer. Be sure | |||
air. Refer to Figures 1 through 3 | |||
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| air discharge blows above, not | ||
| (page 3) for proper space. | ||
| directly at doors. Provide baffle if | ||
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| door extends above blower level. |
Defrost Troubleshooting
Fan Motor
If the motor does not operate or it cycles on thermal overload, remove motor leads from terminal block and apply correct voltage across the leads. If motor still does not operate satisfactorily, it must be replaced. Before starting the unit, rotate fan blades to make sure they turn freely and have sufficient clearance.
If the fan motor fails to start when the control is below 35ºF, disconnect the fan motor leads and check the motor as described for fan motors. Also check whether current is being supplied at “N” and “4” from the timer. The fan delay control must be below 35ºF when checking for a closed circuit.
Fan Delay & Defrost Termination Control
This control is a single pole double throw switch. The red lead wire is wired to common. The black wire is wired in series with the fan motors. The brown wire is wired in series with the defrost termination solenoid in the timer. The brown and red contacts close and the black and red contacts open when the temperature is above 55ºF. The black and red contacts close and the brown and red contacts open when the temperature is below 35ºF.
On initial “pull down” of a warm box the fan will not start until the coil temperature reaches approximately 35ºF. If the box is still comparatively warm (60ºF) when the fan starts, then blowing this warm air over the coil may cause it to warm up to 55ºF and thus stop the fan. Therefore, the fan may recycle on initial “pull down.” This control cannot be adjusted.
Defrost Heater
If unit shows very little or no defrosting and does not heat, disconnect heater andchecktofindifitisburnedout. Totest,applycorrectvoltage across heater or use continuity flashlight battery tester.
Drain Pan
If drain pan has an ice
