ESIE15-11A | Part 1. Introduction 2. System description
Page 6 23/09/16
VRV4 indoor units
2. System description
This system description explains the concept of the VRV4 H/R. All settings in this book however, are applicable to indoor units that
can be connected to VRV4 HP, mini-VRV4, VRV i-series, VRV4 high ambient and VRV4 water-cooled.
2.1. General system layout of a VRV heat recovery system
The VRV heat recovery system consists of 3 different types of units:
• outdoor unit(s)
• BS unit (Branch Selector unit)
• indoor units.
• One to maximum three modules of VRV4 heat recovery outdoor unit can be connected using the optional refnet “BHFQ23P…”.
• Field piping must be thermally insulated copper piping, connected to a combination of “Single circuit BS” unit(s), or/and “Multi
circuit BS” unit(s).
• The “Single circuit BS” unit offers 1 change-over circuit. A “Multi circuit BS” unit offers 4, 6, 8, 10, 12 or 16 outlets.
• To split the refrigerant circuit between outdoor unit(s) and the different BS units, Daikin optional accessory refnets (reference
“KHRQ23M…”) are used.
• Behind the BS unit, one or more indoor units can be connected. To split the refrigerant circuit to the different indoor units to
the same BS unit, Daikin optional accessory refnets (reference “KHRQ22M…”) are used.
• The HT (high temperature) hydrobox is connected without BS unit: only use the HP (high pressure) gas line and the liquid line.
Multi BS
Single BS
Single BS
Refnet KHRQ23M……
LP gas + HP gas + liquid
Gas (LP or HP)
+ liquid
LP gas + HP gas + liquid
Gas (LP or HP)
+ liquid
Gas HP + liquid
Refnet
BHFQ23P…
Refnet
KHRQ22M……
VRV DX
indoor
VRV4 heat recovery
outdoor units
VRV low
temperature
hydro unit
VRV high
temperature
hydro unit
VRV DX
indoor
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