DUCTABLE AIR-TO-WATER HEAT PUMPS 30RQSY 039-160
Variable water flow system (VWF)
The VWF not only ensures control at full load, a specific
Carrier algorithm linked to an electronic frequency converter
also continuously modulates the flow rate to minimise pump
consumption at full load as well as part load.
The hydronic module includes pressure transducers that
permit intelligent measurement of the water flow rate and
real-time display on the Touch Pilot Junior interface. All
adjustments can be made directly on the interface, speeding
up start-up and maintenance.
1 – Constant unit outlet pressure control
The control continuously acts on the pump speed to ensure a
constant outlet pressure.
This solution is suitable for installations with two-way valves.
When these close, the water speed will accelerate in the
system branches that are still open. For a fixed-speed pump
this results in an unnecessary increase of the pressure at the
pump outlet.
The outlet pressure control mode ensures that each circuit
branch always has a uniform supply, without unnecessary
energy waste.
As VWF acts directly on the pump, the system no longer
requires the control valve at the unit outlet. However, for
applications with two-way valves a bypass system must be
kept to guarantee the minimum flow rate.
In industrial processes such as plastic injection moulding,
this solution ensures that each terminal unit has the correct
pressure supply.
Operating logic
2 – Constant delta T control
The VWF algorithm maintains a constant delta T no matter
what the unit load, reducing the flow rate to the minimum.
■■ Full-load set point
The flow rate control at full load uses the Touch Pilot
Junior interface, reducing the pump speed. This first
control saves energy that would normally be dissipated
in the control valve. For example, if the pressure supplied
by the pump is reduced by 20% the power consumption
of the pump is reduced by the same ratio, compared to a
traditional installation.
■■ Operating mode at part load
Touch Pilot Junior includes two part-load operating
modes:
-- Constant outlet pressure control
-- Constant delta T control.
This solution can be used for systems with two-way or threeway valves and achieves higher energy savings than the
“Constant unit outlet pressure control” mode. It is suitable for
the majority of comfort applications.
HEATING
Variable water flow is a hydronic control function package
that permits control of the water flow rate.
Easy and fast installation
■■ Compressors
-- Low-noise scroll compressors with low vibration level
-- The compressor assembly is installed on an
independent chassis and supported by anti-vibration
mountings
-- Dynamic suction and discharge piping support,
minimising vibration transmission (Carrier patent)
■■ Condenser (30RQSY)/air evaporator
-- Vertical condenser coils
-- Protection grilles on anti-vibration mountings to
protect the heat exchanger against possible shocks
(30RQSY 080-160 only).
-- Low-noise latest-generation Flying Bird IV fans, made
of a composite material (Carrier patent) are now even
quieter and do not generate intrusive low-frequency
noise
-- Fan motor controlled by a variable-frequency
controller, to allow adjustment of the fan speed in
accordance with the ducting for optimised efficiency.
-- Rigid fan installation for reduced start-up noise
(Carrier patent)
■■ Physical features
-- Flying Bird IV fans controlled by a variable-frequency
controller to provide up to 240 Pa available pressure
(depending on the size) at nominal flow rate
-- Flow control in accordance with the ducting for
optimised efficiency with the possibility to program a
maximum supply air flow.
-- Supply air duct connection frame.
-- Suction air connection frame standard for sizes
30RQSY 039-078
-- Suction air filters optional (30RQSY 039-078 only)
-- Small unit footprint with a low height (1371 mm) for
easy installation in most buildings
-- The unit is enclosed by easily removable panels,
covering all components (except air heat exchanger
and fans).
■■ Integrated hydronic module (option)
-- Centrifugal low or high-pressure water pump (as
required), based on the pressure loss of the hydronic
installation.
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CONTROLS
Quiet operation
AIR TREATMENT
Features and advantages