Heat Pump Changeover - Daikin VRV Reference Manual

Heat Pump Changeover

The Various Heat/Cool Changeover Options
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There are no less than 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
VRV
AUTO CHANGEOVER
HP
VIA Master Unit
Sensor
MANUAL CHANGEOVER
VIA Master Controller
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.
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