10
11
HEAT
EXCHANGER
COOLING TOWER
�METERING
PUMPS
13"
11.75"
Figure 2 Typical Cooling Tower Installation
3.5 Electrical installation
The various standard wiring options are shown in figure 1 below. Your controller will arrive from the factory prewired
or ready for hardwiring. Depending on your configuration of controller options, you may be required to hardwire some
or all of the input/output devices. Refer to figures 7 through 13 for circuit board layout and wiring.
Note: when wiring the optional flow meter contactor input, the 4-20 mA outputs or a remote flow switch, it is advisable
to use stranded, twisted, shielded pair wire between 22-26 AWG. Shield should be terminated at the controller (see
figure 10).
CAUTION
1.
There are live circuits inside the controller even when the power switch on the front panel is in the OFF position!
The front panel must never be opened before power to the controller is REMOVED!
If your controller is prewired, it is supplied with a 8 foot, 18 AWG power cord with USA style plug. A tool (#1
Phillips driver) is required to open the front panel.
2.
When mounting the controller, make sure there is clear access to the disconnecting device!
3.
The electrical installation of the controller must be done by trained personnel only and conform to all applicable
National, State and Local codes!
4.
Proper grounding of this product is required. Any attempt to bypass the grounding will compromise the safety of
persons and property.
5.
Operating this product in a manner not specified by Walchem may impair the protection provided by the equipment.
AC Power
Power
Switch
Relay
Outputs
Digital Inputs
& Analog Output
Optional pH/ORP
Sensor BNC
Sensor
Figure 1 Conduit Wiring
