Reznor XE Unit Installation Manual - Manual (Page 35)

Form I-XE/CRGB/RPB, Page 34
A
A = Water rise
Pad from PVC
Height Sprinkler Pipe
24" 1/8" to 1/2"
(610mm) (3 to 13mm)
48" 1/4" to 1/2"
(1219mm) (6 to 13mm)
FIGURE 37A - Adjust Water
Flow with the Ball Valve in
FIGURE 36
Sprinkler Pipe
33. Optional Evaporative Cooling Module (outdoor models) (cont'd)
Discharging a quantity of water by "bleed off" will limit the concentra-
tion of undesirable minerals in the water being circulated through the
cooling module. Minerals buildup because evaporation only releases
"pure water vapor" causing the concentration of contaminants in the
water to increase as the evaporation process continues. The minerals
accumulate on the media, in the water lines, on the pump, and in the
reservoir. Adequate bleed off is important to maintaining an efficiently
operating evaporative cooling system.
Filling and Adjusting the Water Level in the
Reservoir
Float and Pump Control System - Turn on the water supply. Check
for good flow.
When the float valve (FIGURE 33) shuts off the water supply, measure
the water depth. The depth of the water should be approximately 3". It
may be necessary to adjust the float valve to obtain the proper water
level or to free the float valve from obstructions. To adjust the float
valve, simply bend the rod upward to raise the water level or downward
to decrease the water level.
Adjusting Water Flow Over Pads
Proper water flow over the evaporative cooling media is critical to
extend the life and maintain the efficiency of the pads. Follow the
instructions to adjust water flow.
CAUTION: Do not flood the media pads with
extreme quantities of water for long periods as this
will cause premature breakdown of the media. An
even flow from top to bottom of the media with the
least amount of water is all that is required to assure
maximum efficiency and media life span. More water
does not provide more evaporation or more cooling.
WARNING: Adjust ball valve only when the power
is disconnected from the system. Failure to do so
can cause electrical shock, personal injury or death.
Float and Pump Control System - Using the ball valve, located in the
middle of the length of hose running from the pump to the distribution
line inlet (FIGURE 36), adjust the valve handle to allow the flow to
completely dampen the media pads from top to bottom.
Bleed Line (cont'd)
If the jumper is at the appropriate location for the media, 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 in-
structions supplied with the microprocessor to change the calibration of
the "On" and/or "Off" cycle.
NOTE: Prior to 2003 the AquaSaver TM timed cycle was controlled by a
mechanical timer. Turn the adjustment screw clockwise to increase the
ON time or counterclockwise to decrease the ON time. One complete
turn will adjust the cycle by 12 to 14 seconds.
All Modules - Check the reservoir for any water leaks. The reservoir
was water tested, but if any small leaks are present, drain the reservoir
and apply a waterproof silicone sealer around corners and welds.
Evaporative Cooling Module Maintenance
WARNING: Disconnect all power to the unit before
doing any maintenance. Failure to do so can cause
electrical shock, personal injury or death.
Reference: Troubleshooting Guide on page 44.
Media - Over time, excessive amounts of mineral deposits may begin to
build up on the media. Annually, scale and dirt should be washed off the
entering surface of the media. Remove the pad retainers and screen (See
Steps 1-3 and 6-8 of Media Replacement Instructions). Clean the media
using a garden hose, mild cleaner, and a soft bristled brush. When the
media becomes too clogged with mineral deposits and dirt that it cannot
be cleaned, the pads should be replaced. The average pad life expectancy
is approximately three cooling seasons.
Select the correct replacement part numbers and order replacement me-
dia pads from your distributor. Follow the instructions that follow and
remove and replace pads as shown in FIGURES 38 and 39.
FIGURE 36 -
Disconnect
the power and
use ball valve
to adjust
water flow.
Ball
Valve
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.
AquaSaver TM 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 l) the water rises from
the holes in the sprinkler pipe (See FIGURE 37A) 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 collects at the drain at the completion of the "ON" cycle.
1) AquaSaver TM Water Flow Adjustment - Using the ball valve illus-
trated in FIGURE 36, adjust the water flow depending on the pad
height. See FIGURE 37A.
2) AquaSaver TM 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 37B).
FIGURE 37B - AquaSaver TM
Microprocessor Control in the
Junction Box
J2
1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
S M L
12-36”
(305-914mm)
Media
Height
37-48”
(940-1219mm)
Media
Height
49-72”
(1245-1829mm)
Media
Height