York YCUL0045E, Установка, эксплуатация и обслуживание

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JOHNSON CONTROLS
74
FORM 150.63-NM8 (1020)
UNIT CONTROLS
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 Temperature
leaving the evaporator.
This message indicates that the cooling setpoint is under
REMOTE control. When under remote control, the cool-
ing 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 displayed:
(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
desired RANGE setpoint. After adjusting the setpoint,
the ENTER/ADV key must be pressed to enter the data
into memory.
The Discharge Air temperature SETPOINT is pro-
grammed from 45°F to 70°F. The Control Range is
programmed from 3.0°F to 10°F.
If the unit was programmed for Suction Pressure control,
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 YCUL0045 -
YCUL0185).
On two system units (YCUL0125 - YCUL0275), each
system is controlled independently of each other accord-
ing 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.
The Suction Pressure SETPOINTS are programmable
from 60 PSIG to 90 PSIG. The Control Range is pro-
grammable from 2 PSIG to 10 PSIG.
Both Discharge Air Temperature and Suction Pressure
control are described in detail under the section on
Capacity Control.
Pressing the COOLING SETPOINTS 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 controlled 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 illustrate
both Discharge Air Temperature and Suction Pressure
control respectively.
(Discharge Air Temperature control)
(Suction Pressure control)
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
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 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 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