Reznor REC (Evaporative Cooling) Unit Installation Manual - Manual (Page 8)

Form I-REC, P/N 16021R3, Page 8
4.0 Electrical
Connections
All electrical wiring and connections, including electrical grounding, must be made in
accordance with the National Electric Code ANSI/NFPA No. 70 (latest edition) or, in
Canada, with the Canadian Electrical Code, Part I-CSA Standard C22.1. In addition,
compliance must be made with any local ordinances and any electric or gas company
requirements that might apply. Consult with local authorities having jurisdiction to verify
local codes and installation procedures.
The wiring diagrams in
FIGURE 10 illustrate the factory-wired connections in the cool-
ing module junction box. Dashed lines are field-wired.
Use the two electrical snap bushings provided to protect the tubing-encased wires
when making connections to the field-supplied air moving equipment.
COOLING CIRCUIT
W.D. 188033
40 VA. AQUA SAVER
AQUA SAVER
24
VAC
H
R
BR
BR
VALVE
SOLENOID
MPR WATER CONTROL
BR B
SUPPLY
BR
B
VALVE
24V
LINE VOLT
R
BR
BR
J
J
SOLENOID
DRAIN
VALVE
Z
R
VALVE
TRANSFORMER
GRD G
R R
J
Model REC with
AquaSaver Timed
Metering Control
System, Option
ECD1
V
W
PUMP MOTOR
LINE VOLT
SWITCH
FLOAT
W B
H
B
J
Y
N.O. TWO WAY
DRAIN VALVE FILL VALVE
THREE WAY
OPTIONAL OPTIONAL
Y
115-230/1/60
COOLING CIRCUIT
111145 REV #4
B
N.O. TWO WAY
DRAIN VALVE FILL VALVE
THREE WAY
OPTIONAL OPTIONAL
208/1/60
COOLING CIRCUIT
111452 REV #4
B
PUMP MOTOR
230 VOLT FLOAT
SWITCH
V
Y
W
H
W B
BUCK-BOOST
40 VA. TRANSFORMER
B
I
Y
J
R
B
BL BR
Y
Y
FIGURE 10 - Wiring
Diagrams for
Evaporative Cooling
Module
WARNING: Adjust ball valve only when power is disconnected
from the unit. Failure to do so can cause electrical shock, personal
injury or death.
Ball
Valve
FIGURE 11 - Disconnect
power; adjust the water
flow with the ball valve.
5.0 Adjust Water
Flow Over
Media
Model REC with
Pump and Float
Control System,
Option ECD2
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.
Float and Pump Control System - Using the ball valve (FIGURE 11), located in the
middle of the length of hose running from the pump to the sprinkler pipe inlet, 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 12A) 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 Water Flow Adjustment - Using the ball valve illustrated in FIGURE
12B, adjust the water flow depending on the pad height. See FIGURE 12A.