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General operation
Service manual
10
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
1 General operation
The VRV IV+ HR (Heat Recovery) system consists of 3 types of units:
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Outdoor units
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Branch selector (BS) units
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Indoor units
Outdoor units
The VRV IV+ HR (Heat Recovery) comes in two different types of outdoor unit
casing:
Small casing (5/8/10/12 HP)
Large casing (14/16/18/20 HP)
There are 2 types of outdoor units:
REYQ-U units can be used as stand-alone units and in multi combinations.
REMQ5U units can ONLY be used in multi combinations and not as stand-alone
units.
There are only 2 combination possibilities for REMQ5U units:
Multi combination
Outdoor unit 1
Outdoor unit 2
REYQ10U
REMQ5U
REMQ5U
REYQ13U
REYQ8U
REMQ5U
U-series and T-series cannot be used together in multi combination.
INFORMATION
U-series units cannot share the same refrigerant circuit with T-series units. However,
electrically, U-series units and T-series units can be present on the same F1/F2 OUT
wiring for central controller connection.
Up to 3 modules of VRV IV+ HR outdoor units can be connected using refnet
BHFQ23P.
Field piping must be thermally insulated copper piping, connected to a
combination of single circuit branch selector unit(s) or/and multi circuit branch
selector unit(s).
Branch Selector units (BS)
A single branch selector unit has only 1 refrigerant circuit.
Multi branch selector units have 4,6,8,10,12 or 16 refrigerant circuits.
To split the refrigerant circuit between outdoor units and different branch selector
units, KHRQ22M refnet branches are used.
After the branch selector unit, one or more indoor units can be connected. To split
the refrigerant circuit for the different indoor units from the same branch selector
unit, Daikin optional accessory refnets (KHRQ22M) are used.
Summary of Contents for VRV IV+
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