Reznor SHH (Indoor PreevA) Unit Installation Manual - Manual (Page 32)

Form I-PDH/SDH/PEH/SHH/PXH, Page 32
1) AquaSaver Water Flow Adjustment - Using the ball valve illustrated in FIGURE
24, adjust the water flow so that the water rises above the distribution pipe as illus-
trated in FIGURE 25.
2) AquaSaver Timer Adjustment - At any given temperature, the media pads should
completely wet from top to bottom during the ON cycle. The microprocessor has three
preset timing settings based on media size. The appropriate setting is selected by
changing the position of the suitcase jumper at J2 on the microprocessor. Remove the
cover and check the setting (See FIGURE 26).
PVC Sprinkler Pipe
PDH/SDH
Size
SHH
Size
PEH
Size
PXH
Size
A = Water rise from
PVC Sprinkler Pipe
75, 100,
125, 150
10A, 20A,
40A, 15B,
30B, 60B
000A,
000B
1/8” to 1/2”
3 to 13mm)
175, 200,
225, 250,
350, 400A
130,
180,
260,
350
30D, 60D,
90D, 120D,
40E, 80E,
120E
000C,
000D,
000E
1/4” to 1/2”
(6 to 13mm)
FIGURE 26 - AquaSaver Microprocessor Control, P/N 205044, in the Junction Box
J2
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
S M L
PDH/SDH
75, 100,
125, 150
PDH/SDH
175, 200, 225, 250,
275, 300,350, 400A
PEH
10A, 20A,40A
15B, 30B, 60B
PEH 30D, 60D, 90D,
120D, 40E, 80E,120E
PXH
000A, 000B
PXH
000C, 000D, 000E
SHH 130, 180,
260, 350
A
FIGURE 25 - Timed
Water System - Use
the ball valve in
FIGURE 24 to adjust
the rise from the
distribution (sprinkler)
pipe in the evaporative
cooling module.
If the jumper is at the appropriate location, replace the cover. If the jumper needs to
be moved, move it to the appropriate setting. The setting will go into effect when the
power is restored. Check the “ON” timing; the media pads should be wet from top to
bottom during the ON cycle.
If the preset timing is not suitable for the application, follow the instructions supplied
with the microprocessor to change the calibration of the “ON” and/or “OFF” cycle.
All Evaporative Cooler Modules - Check the reservoir for water leaks. If any small
leaks are present, drain the reservoir. Dry and apply a waterproof silicone sealer
around corners and welds.
6.5 Optional
Evaporative
Cooling
Module (factory
installed) -
Models PDH,
SDH, PEH, PXH
(cont’d)
6.0 Mechanical
(cont’d)
Operate the unit watching the water flow. After 15 minutes with the blower in operation,
the water should have completely dampened the pads but should not be flowing off the
entering side of the media. If water is flowing off the entering side of the media, turn the
system off, disconnect the power, and reduce the entering water flow.
Adjusting Water Flow with a Timed Metering Control System - NOTE: Water flow
and pad wetting time should be adjusted at maximum airflow and wet bulb depression
to assure complete wetting of the media at the extreme operating conditions.
In addition to adjusting water flow, the timing of the water on/off cycle can be adjusted.
Adjustments are correct when 1) the water rises from the holes in the sprinkler pipe
consistently along the entire pipe length, 2) the media pads wet evenly after a few
“ON” cycles (no dry spots or dry streaks), and 3) a slight amount of excess water col-
lects at the drain at the completion of the “ON” cycle.
6.5.2 Adjusting Water Flow Over Pads (cont’d)