IGSV-ASCS-0303
10
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.
START-UP
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 the TXV 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 4'-0" section of honeycomb with both
ends, until the bottom clears. Pull up and set aside. The
spray header will be exposed. Grasp the header and pull it
loose from the 90° “L” until you see the misting nozzle,
which should be spraying. If not, check the following:
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.
HAGO-M1 NOZZLE
225-01-3221
WATER
SUPPLY
SPRAY HEADER
RUNS LENGTH OF CASE
WATER FILTER
3 STAGE #00015
225-01-2026
3" AXIAL FAN
225-01-2026
2ND FAN USED
IN 12' CASE
REAR INTERIOR WALL OF CASE
VIEWED FROM FRONT
BALL VALVE
HAMMON
225-01-2026
1/4" 100 X 1/8FPT
SW ADAPTER
225-01-2089A
1/4" OD X 1/8" FPT
SW ADAPTER
225-01-3059
1/8" MPT X 1/4" COMP
PVC ADAPTER
225-01-3059
1/4"MPT X 1/4" COMP PVC ADAPTER
225-01-2026
1/4"MPT X 1/4" OD
COMP ADAPTER
225-01-1312
PAN AND ACCESS PANEL
1/8" 100 X 1/8FPT
SW ADAPTER
225-01-3220
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 R-22 unless otherwise
specified on the customer order. Check the serial plate
on the case for information.
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 tie-in may vary depending on the number of
coils and the draw the case has. Depending on the case
setup, the connecting point in the store may be
5
/
8
",
7
/
8
", or 1
1
/
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
P-traps
(oil traps) at the base of all suction line vertical
risers.
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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