Reznor RPB Unit Installation Manual - Manual (Page 17)

Form I-RPB, P/N 131782 R12, Page 17
Bleed Line Connection (Does not apply to module with optional timed metering sys-
tem.) - Shipped in the evaporative cooling module bottom pan, find a 1/4" I.D. x 1/2"
N.P.T. nylon bleed line fitting (hose barb). Thread the fitting into the female adapter
located opposite the pump/inlet side of the water distribution line. The hose barb will
protrude from the side of the cabinet (See FIGURE 17). Attach a 1/4" I.D. hose to the
barb and run the hose to the nearest drain.
Discharging a quantity of water by "bleed off" will limit the concentration 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 min-
erals 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.
Install the hose barb
and attach bleed line.
FIGURE 17 - Bleed Line
Connection
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 15) 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.
FIGURE 18 -
Disconnect the power
and use ball valve to
adjust water flow.
Ball
Valve
All Evaporative Cooling Modules - A manual water shutoff valve should be installed upstream of the cooling module
inlet, at a convenient non-freezing location, to allow the water supply to be turned on and off. If necessary, install a bleed
line between the manual valve and the cooling module to allow drainage of the line between the shutoff valve and the
cooling module.
All cooling modules are equipped with an overflow and drain fitting. The fittings are in the cabinet bottom and come
complete with a lock nut and a sealing gasket. Check these fittings for tightness before installing the overflow and drain
piping. The drain and overflow fitting will accommodate a 3/4" garden hose thread and is tapped with a 1/2" female pipe
thread for iron pipe.
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 18), adjust
the valve handle to allow the flow to completely dampen the media pads from top to
bottom.
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 Timed Metering Control System - NOTE: Water flow and pad wetting
time should be adjusted at maximum airflow and wet bulb depression to assure com-
plete 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
(See FIGURE 19A) 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.