York D4IC-360, Technical Information

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This aluminium surface causes minimum friction with the air,
and is easy to clean.
3.4.- Base beams
The base beams are fixed and provide a foundation for the
entire unit.
The beams have suspension lugs on the front surface that
allow using a crane to locate the unit.
3.5.- Condensed water tray
The bottom of the tray is tilted towards the drain connection
on the side of the unit to ensure full evacuation of condensed
water.
It can be cleaned easily through the side access door of
the unit.
3.6.- Duct connections
All models are equipped for connecting upward or side return
and impulse air ducts.
Simply remove the covers that correspond to each case (see
Figs. 5 and 6).
For factory assembly of certain options, the arrangement of
the return air duct (bottom or side) should be indicated when
placing the order. These options are: economiser, barometric
damper and extractor fan. The same is applicable to the im-
pulse duct in the case of the hot water coil option and D4IG
units with gas heating.
3.7.- Wide range of flows/fan starts
All units have belt-drive impulse fans, with adjustable pitch
pulleys, to accurately cover air flow and static pressure condi-
tions required by each installation.
The impulse fan is equipped with a smooth starter.
3.8.- Access for maintenance and servicing
These units are supplied with access doors equipped with
hinges and ¼-turn locks.
They offer excellent access to all components that may re-
quire maintenance or servicing.
The liquid sight glasses, located between the outdoor coils of
each one of the circuits, are visible from the outside without
having to remove any panel.
Access to the control circuit and compressor section is inde-
pendent of the cooling operation of the unit.
3.9.- Service connections
There are openings for the entry of power supply cables on
the sides of the units to allow connection at the installation
site with minimum labour.
3.10.- Electrical panel
- In compliance with the EN60204-1 and 6049-1 stand-
ards.
- Main switch with lever, as standard equipment.
- Motors protected by magneto thermal switches and motor
guards.
- Sequence and phase failure detector: In the case it detects
a phase sequence other than R-S-T or if, once the unit is
on, one of the phases fails, this detector, by means of an
internal volt-free contact, disconnects the power supply to
the main board of the unit.
3.11.- Control circuit
24 V control circuit that can operate with the optional DPC-1
(communication) thermostat, or a 24 V thermostat with control
signals (Y1, Y2, G, O/B, W).
Also allows the use of a system analyser (YKtool) for the
purpose of simplifying commissioning, trouble shooting and
resolving failures.
3.12.- Low noise level
The compressors, indoor fan and condensing unit fans are
mounted on antivibratory supports.
The vertical discharge condensing unit fans direct the noise
upwards and away from the surrounding structures.
The compressors of the circuits are located inside a cham-
ber, that has acoustic insulation on full outer surface.
3.13.- Multiple cooling circuits
All models are equipped with independent circuits that
ensure better temperature control and comfort level of the
room, as well as improved performance with minimum op-
erating costs.
The operating sequence of the circuits depends upon the
control unit, and is alternated in accordance with the accu-
mulation of operating hours of each circuit.
3.14.- Compressors
Hermetic Scroll type vertical compressors, with internal
motor protection and an external sump heater included as
standard equipment.
3.15.- System protection
All cooling circuits are equipped, as standard, with the fol-
lowing protection features:
- High and low pressure switches.
- Suction line antifreeze thermostat.
- Liquid line filter-dryer.
- Discharge temperature cut-off switch.
- Suction accumulator (on heat pumps).
- Liquid sight glasses.
3.16.- Gas burner (D4IG units)
Units with gas heating include 4 stages of capacity control.
The group comprises an AISI 409 stainless steel pipe heat
exchanger, adjustable gas valves, electronic ignition control,
mechanical ventilation, as well as all safety controls needed
in compliance with the EC standards.
The unit is supplied complete and ready for connection to a
20 mbar (2ND-H, G20) Natural Gas supply.
3.17.- Air filters
One single filter size for all models (4 units per unit).
As standard, equipped with metal frame filters and dispos-
able 50 mm. filtering media, with 82% gravimetric efficiency
(EU ) and F1 class fire resistance (DIN 548).
The filtering media can be changed easily without the use
of tools.
Washable filtering media with 90% gravimetric efficiency
(EU 4) is also available as an option.
3.18.- Defrost sequence (B4IH equipment)
Defrost is carried out only in heat pump function. Defrost
start and end depend upon the value of the liquid probe in