Daikin EWAQ170F-XR [3/67] General characteristics
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Daikin EWAQ170F-XR [3/67] General characteristics

Daikin EWAQ580F-XR [3/67] General characteristics
GENERAL CHARACTERISTICS
Cabinet and structure
The cabinet is made of galvanized steel sheet and painted to provide a high resistance to corrosion.
Colour Ivory White (Munsell code 5Y7.5/1) (±RAL7044).The base frame has an eye-hook to lift the unit with
ropes for an easy
installation. The weight is uniformly distributed along the profiles of the base and this facilitates the arrangement of the unit.
Compressor The compressor is hermetic orbiting scroll compressor complete with motor over-temperature and over-
current
devices. An oil heater, which starts automatically, keeps the oil from being diluted by the refrigerant when the compressor s
tops. The
compressors are connected in Tandem or Trio on a single refrigerating circuit and are fitted on rubber antiv
ibration mounts and
complete with oil charge.
Refrigerant Units have been optimized to operates with R-410A, refrigerant with zero ODP (Ozone Depletion Potential). R-
410A
has been the logical choice for our multiple scroll chiller because today it is one
of the most promising refrigerants in terms of
efficiency, stability and environmental impact. R-
410A offers a small swept volume, a good heat exchange capacity and leads to
reduced component sizes of items such as heat exchangers and tubing.
Evaporator (Plate Heat Exchanger)
The unit is equipped with a direct expansion plate to plate type evaporator. This heat
exchanger is made of stainless steel brazed plates and is covered with a 20mm closed cell insulation material. The exchanger
is
equipped with an electric heater for protection against freezing down to –
28°C and evaporator water connections are provided with
victaulic kit (as standard). The evaporator is manufactured in accordance to PED approval. Flow switch on evaporator standar
d factory
mounted. Water filter is standard.
Condenser The condenser is manufactured with internally enhanced seamless copper tubes arranged in a staggered row pattern
and mechanically expanded into lanced and rippled aluminum condenser fins with full fin collars. An integral sub-
cooler circuit provides
sub-cooling to effectively eliminate liquid flashing and increase cooling capacity without increasing the power input.
Condenser fans (ø 800)
The condenser fans are propeller type with high efficiency design blades to maximize
performances.
The material of the blades is glass reinforced resin and each fan is protected by a guard. Fan motors are internally protecte
d from
overtemperature and are IP54.
Electronic expansion valve The unit is equipped with the most advanced electroni
c expansion valves to achieve precise
control of refrigerant mass flow. As today’s system requires improved energy efficiency, tighter temperature control, wider r
ange of
operating conditions and incorporate features like remote monitoring and diagnostics,
the application of electronic expansion valves
becomes mandatory.
Electronic expansion valves possess unique features: short opening and closing time, high resolution, positive shut-
off function to
eliminate use of additional solenoid valve, continuous modulation of mass flow without stress in the refrigerant circuit and corrosion
resistance stainless steel body.
Electronic expansion valves are typically working with lower ΔP between high and low pressure side, than a thermostatic expan
sion
valve. The ele
ctronic expansion valve allows the system to work with low condenser pressure (winter time) without any refrigerant flow
problems and with a perfect chilled water leaving temperature control.
Refrigerant circuit
Each unit has 2 independent refrigerant circuits and each one includes:
• Compressors
• Refrigerant
• Evaporator
• Air Cooled Condenser
• Electronic expansion valve
• Liquid line shut off valve
• Sight glass with moisture indicator
• Filter drier
• Charging valves
• High pressure switch
• High pressure transducers
• Low pressure transducers
• Suction temperature sensor
Electrical control panel Power and control are located in the main panel that is manufactured to ensure protection against all
weather conditions. The electrical panel is IP
54 and (when opening the doors) internally protected against possible accidental contact
with live parts. The main panel is fitted with a main switch interlocked door that shuts off power supply when opening.
Power Section
The power section includes
compressors and fans protection devices, compressors and fans starters and control
circuit power supply.
MicroTech III controller MicroTech III controller is installed as standard; it can be used to modify unit set-
points and check control
parameters. A built-
in display shows chiller operating status plus temperatures and pressures of water, refrigerant and air,
programmable values, set-
points. A sophisticated software with predictive logic, selects the most energy efficient combination of
compressors, EEXV and condenser fans to keep stable operating conditions to maximise chiller energy efficiency and reliability.
MicroTech III is able to protect critical components based on external signals from its system (such as motor temperatures,
refrigerant gas, corr
ect phase sequence (option), pressure switches and evaporator). The input coming from the high pressure switch
cuts all digital output from the controller in less than 50ms, this is an additional security for the equipment.
Fast program cycle (200ms) for a
precise monitoring of the system. Floating point calculations supported for increased accuracy in
Pressure / Temperature conversions.
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