18
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Piping installation
Installer and user reference guide
81
RWEYQ8~14T9Y1B
VRV IV water-cooled system air conditioner
4P452191-1B – 2020.10
a
b
c
d
e
f
g
h
i
a
Water inlet piping
b
Filter (accessory)
c
Air purge plug (for joint use with cleaning port) (field supply)
d
Cleaning device
e
Filter for pump (field supply)
f
Automatic air purge valve (field supply)
g
Water outlet piping
h
Joint use with water draining plug
i
Plate heat exchanger
18.2.4 About the water flow rate
The RWEYQ*T9Y1B models are equipped with the logic to operate with a variable
water flow rate function.
a
b
c
a
Constant flow
b
Flow regulating valve (field supply)
c
Inverter pump (field supply)
A system can either be configured as a constant flow system (a), a variable flow
system with valve (b) or a variable flow system with a pump (c).
▪
Constant flow system (a): the variable water flow rate function is not used.
▪
A pressure independent flow regulating valve (b): the valve controls the flow rate
of a centralized inverter pump through the unit.
▪
Inverter pump (c): the pump directly controls the water flow rate through the
unit.
To activate the variable flow system, change field setting [2-24] to the applicable
value. See
NOTICE
Make sure that all field supplied equipment for variable flow rate can be switched off
together with the outdoor unit. This is required when cleaning the plate heat
exchanger.
NOTICE
Make sure that all field supplied equipment for variable flow rate meet the minimum
hydronic and electric specifications. Failure to do so can result in inefficient
operation or even breakdown of the system.
Size the valve (b) or pump (c) in accordance with the maximum required flow rate
A, calculated by the installer of the hydronic system (with respect to the operation
range of the outdoor unit). The typical operation range of the flow rate of the
valve/pump is 50% (B) to 100% (A).
