Hitachi’s VRF with CS Net system control
prevents annoying cold draughts
Available across the entire Set Free VRF
range managed with CS Net control
systems, Hitachi Air Conditioning’s
innovative cold draught prevention has
been improving the working conditions
and productivity of staff wherever
it’s installed, and reducing customer
complaints and call outs for engineers. Electronic Expansion Valve. Via CS Net
Systems it is possible to set a minimum
Air Off temperature in cooling mode for
the indoor units to avoid cold draughts
when the discharge air temperature is
below the desired one, resetting the unit
to Thermo-On once it’s back inside the
comfort range.
In standard VRF systems the control is
only on the Return Air Temperature,
so when the heat load demand is
low the discharge air temperature
could be reduced, sometimes below
a comfortable level, creating a cold
draught. Staff will invariably adjust the
room thermostat to increase the room
air temperature to compensate, leading
to an increase of discomfort effects and
with a possible consequent increase in
energy usage and end-user energy costs. First to market
Hitachi was the first manufacturer to
provide off coil temperature control
as standard, and with a wide range
of System Free indoor unit and heat
exchanger combinations available with
nominal capacities - which could be as
low as 0.6HP (1.7kW) and up to 130%
connection ratio (to outdoor capacity) -
there is an appropriate combination for
any Hitachi Set Free VRF installation.
Central control
Hitachi’s innovative CS Net central
controller with off coil protection
works in conjunction with its System
Free indoor units which each have an
Air On Thermistor, Air Off Thermistor,
Liquid Thermistor, Gas Thermistor and
In addition, Hitachi’s Technical Sales team
can help customers specify and design
a system, or the HiToolKit software
along with an effective Schedule tool
can be used to plan, select and design
a complete VRF system in just a few
minutes.
“Using the CS Net system with our
Set Free VRF prevents the risk of cold
draughts in offices and increases staff
comfort and productivity,” commented
Pier Giorgio Cesaratto, UK Product
Marketing Manager, Hitachi Air
Conditioning Europe SAS. “And it could
help save end users money as energy
costs can finally be reduced. Furthermore
Hitachi is very keen to provide customers
with full support when sizing systems.
We believe the combination of Set Free
VRF, System Free indoor units and our
innovative CS Net systems sets a new
industry benchmark for controlling and
preventing cold draughts in a range of
applications including offices and shops.”
For more information about the
Johnson Controls – Hitachi Air
Conditioning Set Free VRF range
with comfort protection function as
standard, contact Hitachi Direct Sales
on 020 3901 0912 or the extensive
Hitachi distributor network.