York D4IC-360, Technical Information

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2
Air Conditioning mode key
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Pressing this key in Normal Mode changes the current air
conditioning mode (OFF, COOL, HEAT, AUTO, AUTO PROG,
EMERG HEAT).
Occupation mode key
In Normal Mode it will change the current occupation
or comfort mode (Day/Night), displaying the set point
temperature next to the flashing thermometer. If pressed
once again while still in the
Adjust Mode , each occupation
mode will be accessed one by one in a sequential and
cyclic manner.
If the
key is pressed and held for over 1 second, the
unoccupied mode will be accessed. If no other change is
made in this mode, the unoccupied status will remain for
an indefinite period of time. If the
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key is pressed, the
set point disappears and No. 0 is displayed in its place,
indicating the number of days the unoccupied status
should last. Keys
and increase and decrease
this number of days (with a maximum of 99), and the
is displayed.
Fan mode key
Pressing this key accesses the Adjust Mode , which
lasts 5 seconds. In this mode the fan flashes and the pro-
grammed speed is displayed, and whether in auto or per-
manent mode.
Outdoor Temperature key
Pressing this key in Normal Mode displays the outdoor tem-
perature for 5 seconds.
16 - Operation
16.1.- Cooling system
The cooling system is a complete factory-mounted as-
sembly that uses an air-cooled condenser. The system is
delivered charged with refrigerant. The compressors are
sealed airtight and have internal shock absorbency.
The compressors also have intrinsic (internal) protection.
Should there be an unusual temperature increase in the
compressor, the safety device will open, turning the com-
pressor off.
16.2.- Preliminary cooling operation
Once installation is completed, connect the sump heat-
ers during at least four hours prior to starting the unit
up. After this initial heating operation, the compressors
should undergo three false start-ups (sufficient for a few
rotations), with a 5-7-minute delay between starts, prior
to full operation.
16.3- Thermostat operation
VENTILATION (FAN) MODE: If the fan switch is set to "FAN",
the indoor fan is in continuous operation. If not, the fan is
activated by means of the thermostat only during cool or
heat operation.
AUTO MODE: If the thermostat selector is set to "AUTO", the
unit operates both in the cooling as well as heating modes,
as required by the thermostat. There is a differential of 1º
C between the cool and heat set points (this value can be
increased with the DPC-1 thermostat).
COOL/HEAT: If the thermostat is set to "COOL", the unit oper-
ates in the cooling mode when the thermostat requires cool,
but does not operate in the heating mode. If set to "HEAT",
the unit operates in the heating mode when required, but not
in the cooling mode.
This cool or heat management varies in accordance with
the type of thermostat in use: DPC-1 (communication) or a
relay thermostat.
16.4.- Cooling operation sequence
Without economiser: If the unit is not equipped with an
Economiser, the first demand of the thermostat starts the
compressor with the lesser number of operating hours,
or available.
If the thermostat generates a second demand, the com-
pressor with the second lesser number of operating hours,
or available, is started.
A third demand can be generated by starting the third
compressor.
If relay thermostats are used, the third demand is gener-
ated by the control board by timing. This is deactivated
once the second demand disappears.
With economiser:
If the unit is equipped with an Econo-
miser, the request for Cooling will depend upon whether
conditions are favourable. In this case, the damper is
modulated to achieve the lowest possible impulse tem-
perature without going below 12° C. In the temperature
mode, favourable conditions are understood as an outdoor
temperature below 20° C, while remaining below the return
temperature.
In enthalpy mode, favourable conditions are understood as
an outdoor enthalpy below the return enthalpy by at least
5%, and an outdoor temperature below 20° C. Operation in
enthalpy mode requires a jumper at S2 of the economiser
board. Should the enthalpy probes fail, the unit operates
on the conventional probes.
REQUEST FOR COOLING, 1: If conditions are favour-
able, the damper is modulated to achieve an impulse air
temperature of 12° C.
If not favourable, one compressor is enabled.
REQUEST FOR COOLING, 2: If the thermostat is not sat-
isfied by the operation of the economiser, the thermostat
generates a second demand, starting a compressor.
Occupation detector
The occupation detector intake is pin 1 of connector J1 on
the second compressor board. Open means un occupied.
In this case, there is an incidence of the green LED on the
control board.
If thermostat DPC-1 is used, the night set points will be ap-
plied. In the case of a relay thermostat, the economizer will
operate in cool mode only.
NOTE:
Before each cooling season, the sump heaters should be connected
at least 10 hours prior to starting the system.