Change over 2-pipe
2-pipe change over involves the use of only one valve actuator which should
be wired to the cooling output terminal. This actuator then controls both
the heated water and the chilled water, which is transported in the same
pipe. In winter, when heating is required, the valve opens if the water in the
pipe is warmer than the temperature set point. If the water is colder, the
valve does not open.
In summer, when cooling is required, the valve opens if the water in the
pipe is colder than the temperature set point. In order to be able to use this
function, you are required to mount an external temperature sensor onto
the water pipe through which supply water circulates continuously. Wire
the sensor according to the general wiring diagram shown in the section
entitled: “Installation”.
Change over 4-pipe
4-pipe change over means that the pipe system consists of 4 pipes: cooling,
heating with supply and return.
A 6-way valve (CCO® – Compact Change Over) is used for alternating
between heated or chilled water conveyed to the room product’s coil. The
whole coil is then utilized for heating or cooling with one and the same
circuit, in contrast to a traditional cooling/heating solution in which heated
water and chilled water are conveyed in separate circuits inside the coil.
Even here, the regulator’s cooling output is used for controlling cooling/
heating.
Night cool
The function involves using cold air from outdoors for cooling the room at
night to the predefined level.
The function can only be managed in control systems that are connected to
a main control system via ModBus RTU.
Time-set setpoint restoration
The function involves adjusting the room temperature to the predefined
level when the controller switches to the AUTO operating mode.
The controller also switches automatically to the AUTO mode after a
predefined number of minutes after the most recent change, manually
entered on the room unit.
Timed resetting of set points
The function involves adjustment of the room temperature to the pre-
defined level when the controller switches over to the AUTO mode.
The controller automatically switches to the AUTO mode after a pre-defined
number of minutes after the latest manual change entered in the room unit.
CONDUCTOR
W4
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