Reznor REC (Evaporative Cooling) Unit Installation Manual - Manual (Page 10)

Form I-REC, P/N 16021R3, Page 10
45°
Airflow
to S
pace
Out
side Airflow
IMPORTANT: Cooling media is
made up of two different sheets of
cooling material. Each has its own
unique angle. When replacing the
cooling media, BE CERTAIN the 45°
angle slopes downward toward the
incoming outside air. If the media is
not installed properly, water blowoff
from the media pads will occur.
FIGURE 15 -
Airflow
Direction
through
Media Pad
6.2 Water Feed
Line and PVC
Distribution
Piping
6.3 Water Pump
and Inlet Basket
Screen (float
and pump control
system)
Instructions for Replacing
Evaporative Cooling Media
Pads
1. Remove the three sheetmetal screws that hold the top pad retainer in
place. Release the top pad retainer from the cooling module.
2. Remove the three sheetmetal screws that hold the bottom pad retainer
in place. Release the bottom pad retainer from the cooling module.
3. Disengage the screen retainers from the sides of the media. Disengage
the inlet screen from the media pads and remove from the cooling
module.
4. Slide all media pads horizontally away from the cooling module until
clear of bottom reservoir pan. Dispose of properly.
5. Replace media by sliding media pads over both support rails until back
stop is encountered. Media MUST be placed with air flow as shown in
FIGURE 15 (left).
6. Center screen on the incoming air side of the media.
7. Replace the two side screen retainers by fitting them between the side
of the media pad and the side of the cooling module. The retainers
should fit snugly, pinching the screen against the media pads.
8. Replace the bottom pad retainer by securing the retainer between the
pad and the reservoir pan. Fasten with the three sheetmetal screws
removed in Step 2.
9. Replace the top pad retainer by securing the retainer between the pad
and the top of the cooling module. Fasten with the three sheetmetal
screws removed in Step 1.
Annually, the water supply line and the PVC water distribution pipe should be flushed
of debris and contaminants. Remove the media pads following the instructions above.
Remove the water feed line from the downstream side of the ball valve. On a float and
pump system, unscrew the water bleed line barbed hose fitting.
Force a fresh water supply up through the water inlet hose and thoroughly flush the
distribution pipe.
Annually, the pump and inlet screening or basket should be removed, disassembled
and cleaned.
FIGURE 16 - Remove
Junction Box, Pump
and Float Switch as an
Assembly
Pump
Motor
Pump with mesh screening over inlet
Float
Switch
Junction Box (Note: Only 208V
unit will have a transformer in
the junction box.)
6.0 Maintenance and Service (cont’d)
WARNING: Do not
expose pump motor
or any part of the
electrical box to
water. Evaporative
cooling pump is
NOT submersible.
1. Disconnect the power supply to the unit.
2. Remove the junction box door and disconnect the two power supply wires from
the terminal block inside the junction box.
3. Disconnect the water feed line hose from the upstream side of the ball valve.
4. Unscrew the four sheetmetal screws holding the junction box to the cooling
module. Remove the assembled junction box, pump, and float switch as one
piece.
5. Either remove the screening or dislodge the inlet basket from the pump and clean
any buildup of debris and dirt. Carefully remove the base cover plate from the
bottom of the pump. Using a mild soap solution, wash all deposits from the inside
of the pump and remove all debris from the impeller.
6. Reassemble the pump. Replace the parts in exact reverse order, being careful
that everything is returned to its proper position.