User Manual Thermal X - R Series Chillers
Page 15
Pump Delay Time
The controller will wait for a certain time before taking flow reading – it is designed to give the ball
valve time to open before indicating flow problems
Tandem Control
One chiller will need to be assigned a master chiller and the other a slave chiller – see “CHANGING
THE CONTROLLERS PARAMETERS” section for instructions on doing this. The master chiller
will do all the controlling and timing. OUT8 (Standby: Tandem link enable/ Status) on the control
board will be energised while it is running closing the indicated input (enable) on the standby chiller
not allowing it to run. After a week the output will de-energise and the standby chiller will run – its
OUT8 energising closing the input on the now standby chiller.
Close Tolerance
If the unit has been manufactured for close tolerance then the controller will attempt to keep the water
temperature within the close tolerance range around the midpoint between the set point and the
hysteresis.
For example if the set point is 10°C, the hystersis 2°C and the close tolerance 1°C then the controller
will attempt to keep the temperature between 10.5°C and 11.5°C. The ability of the chiller to keep
the temperature as close to the set point will vary depending on heat load. The closer the heat load is
to the chillers rated capacity the more accurate the chiller can maintain the close tolerance. Under low
loads the chiller will be unable to maintain less that 1°C close tolerance.
Putting the unit in standby mode
Using the key pad the unit can
be put into standby mode if
there is a reason to shut the
unit down for a short amount
of time.
Scroll through the menu to find “KEYPAD STANDBY”
Press “OK” and then “OK TO CONFIRM” The unit will stop running
The screen will be showing “OK TO RE-START” and “KEYPAD
STANDBY MODE” will be flashing
Press “OK” and the chiller will go through its normal start up
procedure
Note: This does not turn the unit off and the electrical circuitry inside the electrical box will still be live.
Chiller achieves close tolerance control by using Aqua Cooler PCB to collect high pressure and low
pressure data. PCB uses collected data to calculate suitable hot gas amount and send signal to hot gas
solenoid valve.
