York MILLENIUM YCAS Series, Установка, эксплуатация и обслуживание, Страница: 133 / 156

133
YORK INTERNATIONAL
FORM 201.18-NM6
Key in the desired Chilled Liquid Setpoint and the al-
lowable deviation (Range). The micro will accept val-
ues from -12 to 21°C (10.0 - 70.0°F). For values below
4°C (40°F), Dip Switch S1, Switch #1 on the Micropro-
cessor Board must be properly programmed for Brine
Cooling (see Section 3.7). If unacceptable values are
entered, or the switch is incorrectly selected when
setpoints below 4°C (40°F) are entered, the following
message will be displayed before returning to the Con-
trol Range message:
After the Setpoint is keyed in, the cursor will automati-
cally advance to the first digit of the Range as shown :
This value should be programmed for the maximum
allowable positive and negative chilled liquid tempera-
ture deviation that is acceptable from setpoint in the
system application. A typical value would be 1°C (+/-
2.0°F). The micro will accept a range from 0.8 - 1.4°C
(1.5 - 2.5°F).
After the Setpoint and Range is keyed in, press the
ENTER Key to store the data in memory.
Failure to press the Enter key will
cause the newly programmed values to
be ignored and not entered into
memory.
After pressing the Enter key, the display will continue
to show the message until another key is pressed.
6.4 REMOTE COOLING SETPOINTS KEY
Remote Cooling Setpoints key allows resetting the
setpoint upward from the programmed value in memory
from a remote device. This feature is typically used for
demand limiting or ice storage applications. Reset is
accomplished by timed closure of external contacts for
a defined period of time and allows reset of the setpoint
upward by up to 22°C (40°F) above the setpoint pro-
grammed in memory – see Section 1.7.
The maximum allowable reset must be programmed into
memory and can be a value of 1 to 22°C (2 to 40°F)
depending on user requirements. To program the reset,
press the Remote Reset Temperature Range key. The
following message will appear:
The display indicates the Remote Setpoint which is al-
ways equal to the chilled liquid setpoint programmed
by the Chilled Liquid Temperature/Range key plus the
offset from the remote reset signal. The display will
also show the Range which is the programmed maxi-
mum deviation allowed for the application. This dis-
play is not programmable, and will change the setpoint
only through a signal from a remote device.
Pressing the REM RESET TEMP RANGE Key again
scrolls the display to the MAX EMS-PWM REMOTE
TEMP RESET which is programmable. This should be
programmed to the maximum offset which is required
for the application. The maximum programmable value
is 22°C (40° F), while the minimum programmable value
is 1°C (2°F).
The cursor will stop beneath the first digit of the maxi-
mum reset. Key in the maximum reset allowed for the
application, remembering to use a leading “0” for val-
ues less than 10°C (or 10°F). Press the ENTER Key to
store the new value in memory.
O U T O F R A N G E -
T R Y A G A I N !
S E T P O I N T = 6 . 7 ° C
R A N G E = + / - 1 . 1 ° C
R E M S E T P = 6 . 7 ° C
R A N G E = + / - 1 . 1 ° C
M A X E M S - P W M R E M O T E
T E M P R E S E T = 2 2 . 2 ° C
6.3 LOCAL COOLING SETPOINTS KEY
The Local Cooling Setpoints key is used to program
the required Leaving Chilled Liquid control tempera-
tures for the application. When the key is pressed, the
following message will be displayed:
S E T P O I N T = 6 . 7 ° C
R A N G E = + / - 1 . 1 ° C
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