York MILLENNIUM YCUL0016SC, Сборка, установка, эксплуатация и обслуживание

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YORK INTERNATIONAL
112
If the unit was programmed for Suction Pressure con-
trol, the following message would be displayed instead
of the previous message.
(Suction Pressure control)
The setpoint and range are programmed with the UP
arrow. DOWN arrow, and ENTER/ADV key as de-
scribed in the previous setpoint message. The setpoints
in Suction Pressure Control are the suction pressures
of each individual system on the condensing Unit and
will control to /- the cooling range. This method
of control cannot be used unless the unit is equipped
with suction transducers (optional on YCUL0014 -
YCUL0066).
On two system units (YCUL0046 - YCUL0090), each
system is controlled independently of each other ac-
cording to its own setpoint and cooling range, so there
will be two similar displays - a setpoint and range for
both system 1 and system 2.
A listing of the limits and the programmable values for
the COOLING SETPOINTS are shown in Table 27.
Both Discharge Air Temperature and Suction Pressure
control are described in detail under the section on Ca-
pacity Control.
Pressing the COOLING SETPOINTS key again, after
setting the “local” setpoint(s), will display the remote
setpoint and cooling range. This display automatically
updates about every 2 seconds. Notice that these
setpoints are not “locally” programmable, but are con-
trolled by a remote device such as an ISN control. These
setpoints would only be valid if the unit was operating
in the REMOTE mode. The following messages illus-
trate both Discharge Air Temperature and Suction Pres-
sure control respectively.
(Discharge Air Temperature control)
(Suction Pressure control)
S E T P O I N T = 5 5 . 0 ° F
R A N G E = + / - 5 . 0 ° F
S Y S X S P = 7 0 P S I G
R A N G E = + / - 3 P S I G
R E M O T E S U C T I O N
P R E S S U R E C O N T R O L
Unit Controls
unlike the previous message, it is now indicating that
the control point is based on Suction Pressure.
This message indicates that the cooling setpoint is un-
der REMOTE control. When under remote control, the
cooling setpoint will be determined by a remote device
such as an ISN control. The message also indicates that
the control point is based on Discharge Air Tempera-
ture leaving the evaporator.
This message indicates that the cooling setpoint is un-
der REMOTE control. When under remote control, the
cooling setpoint will be determined by a remote device
such as an ISN control. This message also indicates
that the control point is based on Suction Pressure.
Immediately after the control mode message is dis-
played, the COOLING SETPOINT entry screen will
be displayed. If the unit is programmed for Discharge
Air Temperature the following message will be dis-
played:
(Discharge Air Temperature control)
The above message shows the current Discharge Air
temperature SETPOINT at 55.0°F (notice the cursor
positioned under the number 5). Pressing either the UP
or DOWN arrow will change the setpoint in .5°F incre-
ments. After using the UP and DOWN arrows to adjust
to the desired setpoint, the ENTER/ADV key must be
pressed to enter this number into memory and advance
to the RANGE SETPOINT.
This will be indicated by the cursor moving under the
RANGE setpoint. The UP and DOWN arrow keys are
used to set the RANGE, in .5 °F increments, to the de-
sired RANGE setpoint. After adjusting the setpoint, the
ENTER/ADV key must be pressed to enter the data
into memory.
R E M O T E D I S C H A R G E
A I R T E M P C O N T R O L
R E M S E T P = 5 5 . 0 ° F
R A N G E = + / - 5 . 0 ° F
R E M S P X = 7 0 P S I G
R A N G E = + / - 3 P S I G