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When an unacceptable value are entered the following
message will be displayed before returning to the ‘SET-
POINT’ message:
After the setpoint is keyed in, the cursor will automati-
cally advance to the first digit of the range as shown:
This range should be programmed for the maximum
allowable positive and negative chilled liquid tempera-
ture deviation that is acceptable from setpoint in the
system application. The microprocessor will accept a
range from 0.9 to 1.4 °C.
After the setpoint and range are 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 con-
tinue to show the message until another key is pressed.
7.11 REMOTE COOLING SETPOINTS KEY
The ‘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 con-
tacts for a defined period of time and allows reset of
the setpoint upward by up to 22°C above the setpoint
programmed in memory.
The maximum allowable reset must be programmed
into memory and can be a value of 1 to 22°C depend-
ing on user requirements.
To program the reset, press the ‘REMOTE COOLING
SETPOINTS’ key. The following message will appear:
The display indicates the current remote setpoint which
is always equal to the chilled liquid setpoint pro-
grammed under the ‘LOCAL COOLING SETPOINTS’
key plus the offset from the remote reset signal. The
display will also show the control range.
Pressing the ‘REMOTE COOLING SETPOINTS’ key
again scrolls the display to the ‘MAX EMS-PWM RE-
MOTE TEMP RESET’ display which is programmable.
This should be programmed to the maximum offset
which is required for the application. The program-
mable range is 1°C to 22°C.
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. 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 = 7 . 0 ° C
R A N G E = + / - 1 . 0 ° C
R E M S E T P = 1 2 . 0 ° C
R A N G E = + / - 1 . 0 ° 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 = + 1 0 ° C
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