Johnson Controls YORK YK MaxE, Operation Manual

Page: 103 / 184

FORM 160.54-O1
103
JOHNSON CONTROLS
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Local Leaving Chilled Liquid Temperature -
Range Access Level Required : OPERATOR
This is the range over which an analog signal (0-20
mA, 4-20 mA, 0-10VDC or 2-10VDC) in Analog Re-
mote Mode or a digital signal (PWM) in Digital remote
mode can reset the Leaving Chilled Liquid Temperature
setpoint above the operator programmed Base Setpoint
(see below). Programmable as either 10°F or 20°F, with
a default of 20°F, it is added to the
BASE
value to cre-
ate a range over which the remote device can reset the
setpoint. For example, if this setpoint is programmed for
10°F and the operator programmed value is 45°F, then
the remote device can set the Leaving Chilled Liquid
Temperature setpoint over the range 45.0°F - 55.0°F.
Local Leaving Chilled Liquid Temperature -
Setpoint
Access Level Required : OPERATOR
This value allows the user to define the Leaving Chilled
Liquid Temperature that is to be maintained by the chiller.
It is programmable over the range of 38.0°F to 70.0°F
(water) or 10.0°F to 70.0°F (brine). If Smart Freeze is
enabled, the range is 36.0°F to 70.0°F (water). A remote
device can provide an analog signal (0-20 mA, 4-20
mA, 0-10VDC or 2-10VDC) in Analog Remote mode,
or PWM signal in Digital Remote mode that changes
the setpoint by creating an offset above the operator
programmed BASE Leaving Chilled Liquid Tempera-
ture setpoint. This offset may be defined up to 10.0°F
or 20.0°F above the BASE setpoint (see the Remote
Leaving Chilled Liquid Temperature Setpoint Range
description above). Additionally, MicroGateway (in ISN
Remote mode) can define the setpoint through a serial
data stream. In this case, the incoming setpoint is not an
offset that is applied to the locally programmed BASE
setpoint value, but rather is the setpoint value itself.
Leaving Chilled Liquid Temperature
Cycling Offset - Shutdown
Access Level Required : OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will shut down
on a
LEAVIng CHILLED LIQUID – LOW TEM-
PERATURE cycling shutdown. This is done by defining
an offset below the Leaving Chilled Liquid Temperature
setpoint. It is programmable over a range of 1°F to 64°F
below the setpoint, to a minimum cutout of 36°F (water),
34°F (water with Smart Freeze enabled) or 6°F (brine).
It establishes the minimum allowed temperature for the
Leaving Chilled Liquid Temperature and prevents over-
cooling of the building. Anytime the Leaving Chilled
Liquid Temperature setpoint is increased, the shutdown
threshold is 36.0°F (water) or 6.0°F (brine) for the next
ten (10) minutes. If Smart Freeze is enabled, the thresh-
old is 34.0°F for the next 10 minutes. After ten (10)
minutes have elapsed, the shutdown threshold becomes
the programmed setpoint value.
Leaving Chilled Liquid Temperature
Cycling Offset - Restart
Access Level Required
: OPERATOR
This value allows the user to specify the Leaving Chilled
Liquid Temperature at which the chiller will restart af-
ter a shutdown on a LEAVIng CHILLED LIQUID
– LOW TEMPERATURE cycling shutdown. This is
done by defining an offset above the Leaving Chilled
Liquid Temperature setpoint. It is programmable over a
range of 0°F to 70°F above the setpoint, to a maximum
restart value of 80°F. The chiller will automatically re-
start when this temperature is reached. This setpoint can
be used to reduce chiller cycling by delaying the chiller
restart until the cooling load has increased.
Remote Analog Input Range
(Flash Memory Card version C.MLM.01.01 or later)
Access Level Required: OPERATOR
This setpoint defines, for the Control center, the remote
signal range applied for remote reset of the Leaving
Chilled Liquid temperature Setpoint and Current Limit
Setpoint in ANALOG remote mode. If the remote signal
is 0-10VDC or 0-20mA, this setpoint must be programmed
for 0-10VDC. If the remote signal is 2-10VDC or 4-20mA,
this setpoint must be programmed for 2-10VDC.
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