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Prestart
Check for correct dry cooler fan rotation. This can be done by quickly jogging the fan
contactor. Be sure that the fans run freely. The same check is recommended for pumps.
Filling and Purging the System
The system should be pressure tested before adding glycol. The system can be tested with
air or water, however if the ambient temperature is at or below freezing the use of air is
recommended. Test pressure should not exceed 60 psig.
Roof Mounted Fluid Cooler
To fill the system, pour the premixed water and glycol into the expansion tank. Fill the
system until the expansion tank is half full, then purge the air from all vents. Operate the
system for a minute, then purge all vents again, and add glycol as required. Repeat the
purging of vents after the first hour of operation and again after several hours of operation.
Ground Mounted Fluid Cooler
The fluid cooler may be lowest point in the system; consequently the premixed water and
glycol will have to be pumped into the system.
Temperature Control
General
Some method of controlling the fluid temperature is required.
The standard temperature control consists of fan contactors arranged for field-connection to
a field-supplied and mounted control system; in other words, no control. Setting and
adjusting these controls will depend on the type furnished.
Daikin can furnish an optional control system using Johnson Controls A419 temperature
controls. Installation and adjustment are explained in the following paragraphs.
Installation
If the fan cycle thermostat option is provided, the solid state sensors are shipped coiled in
the control panel to prevent damages during shipment and installation. Mounted the sensors
securely to the fluid cooler header and insulate. Mount sensors on the entering or leaving
fluid headers depending on site requirements.
protection from vibration and interference.
Setting
The control is a single-stage, electronic temperature control with an SPDT output relay. It
has the following features:
IOM 1062
•
lockable keypad for programming,
•
LCD for temperature and status display,
•
LED for output relay status
•
heating and cooling modes with adjustable setpoint and differential
Direct Drive Fluid Coolers
Route and secure sensor wiring for
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