HEATING
Economical operation
Superior reliability
-- Optional variable-speed pump for economical
operation
-- The control algorithm adjusts the water flow rate based
on the actual system requirements and obsoletes the
need for the control valve at the unit outlet.
■■ Increased energy efficiency at part load
-- Eurovent energy efficiency class (in accordance with
EN14511-3:2013) C and D in cooling mode and B
and C in heating mode.
-- The refrigerant circuit includes several compressors
connected in parallel. At part load, around 99% of
the operating time, only the compressors that are
absolutely necessary operate. At these conditions the
compressors operating are more energy efficient, as
they use the total condenser and evaporator capacity.
-- The electronic expansion device (EXV) allows operation
at a lower condensing pressure (EER, COP and
ESEER optimisation).
-- Dynamic superheat management for better utilisation
of the water heat exchanger surface.
-- Defrost cycle optimisation (30RQ).
■■ Reduced maintenance costs
-- Maintenance-free scroll compressors
-- Fast diagnosis of possible incidents and their history
via the Touch Pilot Junior control
-- R410A refrigerant is easier to use than other
refrigerant blends.
■■ State-of-the-art concept
-- Cooperation with specialist laboratories and use of
limit simulation tools (finite element calculations) for
the design of the critical components, e.g. motor
supports, suction/discharge piping etc.
■■ Auto-adaptive control
-- Control algorithm prevents excessive compressor
cycling and permits reduction of the water quantity in
the hydronic circuit (Carrier patent)
-- Hydronic module with integrated pressure transducers
allowing measurement of the water pressure at two
points, as well as measurement of the water flow rate
and detection of lack of water and pressure. This
considerably reduces the risk of problems such as
frost accumulation on the water heat exchanger.
-- Automatic compressor unloading in case of
abnormally high condensing pressure. If an anomaly
occurs (e.g. fouled air heat exchanger coil, fan failure)
AquaSnap continues to operate, but at reduced
capacity.
■■ Exceptional endurance tests
-- Corrosion resistance tests in salt mist in the laboratory
-- Accelerated ageing test on components that are
submitted to continuous operation: compressor piping,
fan supports
-- Transport simulation test in the laboratory on a vibrating
table.
Environmentally balanced
Remote operating mode with
volt-free contacts (standard)
■■ Non-ozone depleting R410A refrigerant
-- Chlorine-free refrigerant of the HFC group with zero
ozone depletion potential
-- Very efficient - gives an increased energy efficiency
ratio (EER, COP and ESEER)
■■ Leak-tight refrigerant circuit
-- Brazed refrigerant connections for increased leak-
tightness
-- Reduction of leaks due to reduced vibration levels and
elimination of capillary tubes (TXVs)
-- Verification of pressure transducers and temperature
sensors without transferring refrigerant charge.
Partial view of the hydronic circuit
474
A simple two-wire communication bus between the RS485
port of the AquaSnap and the Carrier Comfort Network
offers multiple remote control, monitoring and diagnostic
possibilities. Carrier offers a vast choice of control products,
specially designed to control, manage and supervise the
operation of an air conditioning system. Please consult
your Carrier representative for more information on these
products.
-- Start/stop: Opening of this contact will shut down the
unit
-- Dual set point: Closing of this contact activates a
second set point (example: unoccupied mode)
-- Water pump 1 and 2 control (contacts supplied with
the hydronic module option)*: These outputs control
the contactors of one or two water heat exchanger
water pumps
-- Alarm indication: this volt-free contact indicates the
presence of a major fault that has led to the shutdown of one or two refrigerant circuits
-- Demand limit 1 and 2: Closing of these contacts limits
the maximum unit capacity to three predefined values
-- User safety: This contact can be used for any
customer safety loop, closing of the contact
generates a specific alarm
-- Out of service: This signal indicates that the unit is
completely out of service
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