FORM 150.75-NM2
75
YORK INTERNATIONAL
if an inductive device (relay, contactor) is supplying these
contacts, the coil of the device must be suppressed with
a user supplied YORK P/N 031-00808 suppresser.
REMOTE SETPOINT RESET
(REMOTE RESET TEMP RANGE)
Remote Setpoint Reset allows resetting the setpoint
upward from the programmed value in memory. This is
accomplished by connecting a dry contact between
terminals 13 & 17 of the Master Microprocessor Con-
trol Panel. See Fig. 24 for the location of these termi-
nals. Closing the contact for a defined period of time
allows reset of the setpoint upward by up to 40°F above
the setpoint programmed in memory.
The maximum desired reset must be programmed into
memory and can be a value of 02 to 40°F. This value
will vary according to the users requirements. To pro-
gram the reset, press the REMOTE SETPOINT TEMP
RANGE key. The following message will appear.
The display will indicate the REM SETPOINT which is
always equal to the chilled liquid setpoint plus the offset
from the reset signal. The display will also show the
REM RANGE which is the same as the maximum reset
required. Key in the maximum reset for the REM RANGE
and press the ENTER Key to store the new value in
memory.
Once the maximum reset is programmed, it will require
a contact closure of 21 seconds to achieve the maxi-
mum reset. Closure for less than 21 seconds will pro-
vide a smaller reset. For noise immunity, the micro will
ignore closures of less than 1 second.
To compute the offset for a given timer closed, use the
formula below:
1. Programmed max. reset = Reset per sec.
20 seconds
2. (Time Closed - 1) Reset per sec. = Reset
Example:
Programmed max reset = 30°; Time Closed = 9 sec.
1.
30°
= 1.5° per sec.
20 sec.
2. (9 sec. - 1 sec.) 1.5° per sec. = 12° = Reset
To determine the new setpoints, add the reset to the
setpoint programmed into memory. In the example
R E M
S E T P O I N T
=
4 0 . 0
R E M
R A N G E
=
2 0
D E G F
above, if the programmed setpoint = 44°F, the new
setpoint after the 9 second contact closure would be
44°F + 12°F = 56°F. This new setpoint can be viewed
on the display by pressing the REMOTE RESET TEMP/
RANGE key.
To maintain a given offset, the micro must be refreshed
every 30 seconds - 30 minutes with a contact closure
of the required time period. It will not accept a refresh
sooner than 30 seconds after the end of the last PWM
signal, but must be refreshed before a period of 30 min-
utes expires from the end of the last PWM signal.
After 30 minutes, if no refresh is provided, the setpoint
will change back to its original value. A refresh is noth-
ing more than a contact closure for the period required
for the desired offset.
NOTE: After an offset signal, the new setpoint may be
viewed on the REMOTE RESET TEMP RANGE
DISPLAY. However, if this display is being
viewed when the reset pulse occurs, the
setpoint will not change on the display. To view
the new offset, first press any other display key
on the keypad and then press the REMOTE
RESET TEMP RANGE key. The new setpoint
will then appear.
Wiring from these contacts should not exceed 25 ft.
and should be run in grounded conduit that does not
carry any wiring other than control wiring. Additionally,
if an inductive device (relay, contactor is supplying these
contacts), the coil of the device must be suppressed
with a user supplied YORK P/N 031-00808 suppressor.
NOTE: Remote Setpoint Reset will not operate when a
Remote Control Center Option Kit is connected
to the Micropanel. The remote Control center
will always determine the setpoint.
REMOTE UNLOADING
The Master Microprocessor is capable of remote un-
loading or pulldown demand limiting in two steps. The
first step shuts down the Slave Module. The second
step unloads the Master Module to its 3rd step of ca-
pacity which places the entire system at approximately
15% of its total capacity. % capacity will vary according
to the number of steps that are present on the lead
comressor. The 3rd step of capacity will operate the
lead compressor unloaders de-energizxed (loaded), of
twp are present on the compressor.
To shut down the Slave Module, a dry contact should
be connected between terminals 13 & 16. See Fig. 24
for the location of these terminals. When the contact is
closed, the Slave Module will shut down.
Содержание YDAJ87KU6
Страница 4: ...YORK INTERNATIONAL 4 FIG 1 UNIT COMPONENTS Typical on each of the two modules 00023TG 00024TG...
Страница 5: ...FORM 150 75 NM2 5 YORK INTERNATIONAL FIG 1 UNIT COMPONENTS Cont d LD01910 00025TG...
Страница 24: ...YORK INTERNATIONAL 24 MASTER MODULE WIRING DIAGRAM LD01933 FIG 17 MASTER MODULE CONNECTION DIAGRAM...
Страница 30: ...YORK INTERNATIONAL 30 SLAVE MODULE WIRING DIAGRAM FIG 20 SLAVE MODULE CONNECTION DIAGRAM LD01941...
Страница 99: ...FORM 150 75 NM2 99 YORK INTERNATIONAL...
