Humidity System (cont.)
purge the line to flush any debris that may clog the water filter. If the water line requires purging after the cases are hooked together, it is not necessary to check each one. Simply shut ball valves to each humidity system, remove the water line from the last case in the flow, and purge. By doing this as a precautionary measure, you may avoid problems and repeat servicing.
Turn on the fan circuit. Check to see if the fan for the humidity system is running.Remove the right hand bottom pan (when facing the front of the case),then theTXV cover. The fan is located up against the right hand side of the case, as viewed from the front, under the fan plenum (see diagram).View the blade, and make sure the fan rotation agrees with the air flow arrows. Turn on the water, by turning the ball valve in the direction of the flow (OFF is at 90° to the direction of flow).
After a few minutes, check the spray header by sliding the honeycomb to the left to expose the discharge tube located on the right hand side of the case (when viewed from the rear), by lifting the
1.Make sure the water is feeding the nozzle.
2.Remove the nozzle, and purge the water.
3. Check strainer at entrance to nozzle.
Reinsert the header into the 90° “L”, making sure that the nozzle is in the center of the pipe when totally inserted, and the holes in the header are facing the front of the case at a level angle.
The discharge tube can easily be pulled to service.
MAINTENANCE
•Clean humidity system a minimum of every 90 days for proper system operation.
1/8" 100 X 1/8FPT
SW ADAPTER
SPRAY HEADER | 1/4" 100 X 1/8FPT | |||
SW ADAPTER | ||||
RUNS LENGTH OF CASE | ||||
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| 1/4" OD X 1/8" FPT | |
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| SW ADAPTER |
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REAR INTERIOR WALL OF CASE |
| 1/8" MPT X 1/4" COMP | ||
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| PVC ADAPTER | ||
VIEWED FROM FRONT |
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| 1/4"MPT X 1/4" COMP PVC ADAPTER | |||
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WATER |
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| PAN AND ACCESS PANEL |
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SUPPLY |
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1/4"MPT X 1/4" OD | BALL VALVE WATER FILTER |
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COMP ADAPTER | HAMMON 3 STAGE #00015 |
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| 2ND FAN USED | 3" AXIAL FAN |
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| IN 12' CASE | |
HUMIDITY SYSTEM as viewed from the front.
Note: The axial fans included in the humidity system must be replaced as a unit.
Refrigeration
REFRIGERANT TYPE
The standard refrigerant will be
PIPING
The refrigerant line outlets are located under the case. Locate first the electrical box, the outlets are then on the same side of the case, but at the opposite end. Insulate suction lines to prevent condensation drippage.
REFRIGERATION LINES
LIQUID SUCTION
1/2" O.D. | 5/8" O.D. |
NOTE: The standard coil is piped at 5/8" (suction); however, the store
5/8", 7/8", or 11/8". Refer to the particular case you are hooking up.
Refrigerant lines should be sized as shown on the refrigeration legend furnished by the store.
Install
Pressure drop can rob the system of capacity.To keep the pressure drop to a minimum, keep refrigerant line run as short as possible, using the minimum number of elbows. Where elbows are required, use long radius elbows only.
CONTROL SETTINGS
See the “Case Specs” section of this guidebook for the appropriate settings for your merchandiser. Maintain these parameters to achieve near constant product temperatures. Product temperature should first be measured in the morning, after having been refrigerated overnight. For all multiplexing, defrost should be time terminated. Defrost length and frequency should as directed in the Case Specifications section of this guide. The number of defrosts per day should never change.The duration of the defrost cycle may be adjusted to meet conditions present at your location.
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