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VRV
HP
AUTO CHANGEOVER
VIA Master Unit
MANUAL CHANGEOVER
VIA Master Controller
Sensor
Heat Pump Changeover
The Various Heat/Cool Changeover Options
There are no less than six ways to provide heat/cool changeover on a
heat pump system. Most of these also apply to heat recovery FCU’s
grouped on a single port of a BS Box (think of the BS box as a mini heat
pump system).
Master Unit:
The simplest way to address heat / cool changeover automatically
is to nominate a master unit. When the unit’s return air sensor
measures outside the temperature set point limitation,
he unit switches itself and all other units on the system to the
different mode.
Master Controller:
Similar to the option above except mode selection is made manually by
via a designated master controller. Again, all other units on the system
then switch mode in unison.
Note: A common pitfall is to elect an area that is not in constant use or has no easy
access (e.g. managers office) In both options above, if the unit isn’t running then
mode change is not possible without the intervention of some form of central control.
MASTER
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