Preheating Function - Lauda UC 2 Operation Manual

5.4 PREHEATING FUNCTION

The chiller controller integrates an automated preheating system that can turn on the water pump when the
temperature in the water circuit drops below a specified setpoint. The heat introduced by the pump operation
maintains the water in the tank and in the rest of the circuit at the preset temperature. This system will
operate as long as the general switch is turned On by turning the water pump On and Off when necessary.
By default, this system is disabled, as it has a factory setting of -15ºC (5ºF).
Setting the preheating temperature: The required preheating temperature can be set between -15ºC (5ºF)
and 35ºC (95ºF) from the display (either the remote display connected to the chiller or the webserver on a
connected computer).
In order to set the temperature, go to the Settings screens loop (see point 5.2), press Down to access the
Preheating set screen, press Enter to highlight the current set value, use the Up/Down buttons to change the
value and press Enter again to confirm the new value.
/
Please note that the heat generated by the pump is limited and, depending on the thermal losses in the whole
water circuit, it's possible that the temperature cannot reach the preheating setpoint even with the pump
running all the time.
It is strongly recommended that all water pipes are properly insulated to minimize the thermal losses.
While the chiller is turned Off but the pump is On because of the preheating system, the pump icon will
remain lit, with the letters "PH" blinking besides it:
To disable the preheating system, leave it set at the minimum possible value (-15ºC, 5ºF).
The fastest way to stop the pump in case of emergency (for example if there's a major water leak), is to turn
Off the Main Power Switch.
28