140.010-IOM (NOV 2019)
Page 22
IDSC EVAPORATIVE CONDENSERS
INSTALLATION
ELECTRICAL DATA
Water distribution pump
The water distribution pump is not factory wired and
requires field wiring.
NOTICE
Do not use VFDs on water distribution pump motors.
Failure to comply with this results in reduced cooler
performance due to insufficient wetting of the coil
bundle. Design water flow over the coil bundle is re
-
quired at all times, especially with regard to capacity
control.
NOTICE
Specific installation information is available on our
website or upon request.
Basin heaters
Basin heaters are copper, through the wall immersion
heater elements with an integral thermostat. Wiring,
disconnects, contactors, and overload protection are by
others. A MSP can be supplied for each heater element to
provide overload protection, short circuit protection, and a
manual on/off switch for each element. A main non-fused
disconnect and contactors can also be provided to ener
-
gize heater elements. See
for heaters control
panel wiring diagram.
Electronic water level controller
A conductance type electronic level control package is
provided with probes located in a PVC standpipe external
to the
basin and with a prewired control panel mounted on
the unit. Suitable for 115 V/1 Ph/60 Hz.
Electrical enclosures
All electrical enclosures are NEMA 4X constructed for
either indoor or outdoor use. This provides protection for
the following:
•
To personnel against access to hazardous parts
•
To the equipment inside the enclosure against ingress
of solid foreign objects, such as windblown dust
•
Against harmful effects on the equipment due to the
ingress of water, such as rain, sleet, snow, splashing
water, and hose directed water
•
Additional level of protection against corrosion
•
Against the external formation of ice on the enclosure.
NEMA 4X is equivalent to IP66 protection classification.
As standard the enclosures are of FRP construction, but a
stainless steel enclosure is optional.
Fan motors
NOTICE
Specific operation and maintenance information is
available upon request.
NOTICE
See the pages below for generic schematics for EC
Motors.
EC motors
A GMM controller is included as standard on all models
supplied with EC motors. The GMM is supplied with either
a pressure or temperature transducer, which requires field
placement. This functionality allows the GMM to automati
-
cally control the primary cell fan motors in accordance
with the system and ambient conditions.
Alternatively, the GMM can be supplied with a 0 VDC to
10 VDC or 4 mA to 20 mA signal from the PLC and oper
-
ate in a slave mode according to system requirements.
This allows for the motors to receive a 0 VDC to 10 VDC
and function automatically. Alternatively, the motors can
be controlled through a communication protocol such as
Modbus or Profibus.
As such, the following operating modes are possible with
EC motors:
•
Automatic control using the internal set point of the
GMM (temperature or pressure control point)
•
Automatic control using external analog input (0 VDC
to 10 VDC)
•
Automatic control using communication protocol
(Modbus, Profibus)
•
Slave mode using external analog input (0 VDC to
10 VDC)
•
Slave mode using external communication protocol
(Modbus, Profibus)
for EC motor control panel wiring diagram.
