YORK INTERNATIONAL
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Whenever current is being limited by a remote reset
signal, the following STATUS message will appear:
NOTE: After an offset signal, the new Remote Current Limit
may be viewed on the Remote EMS Limiting Dis-
play under the % Motor Current Key (See Section
3.5). 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 EMS Limiting Display.
NOTE: Remote EMS Reset will not operate when a
Remote Control Center Option Kit is connected
to the micro. The Remote Control Center will
always determine the setpoint.
NOTE: Wiring from remove dry contact (for reset func-
tions) should not exceed 25 ft. and should never
be run in grounded conduit that does not carry
any wiring other than control wiring or in
screened cable. If an inductive device (relay,
contactor) is supplying these contacts, the coil
of the device must be suppressed with a sup-
pressor YORK Part Number 031-00808-000 (60
Hz models) or a standard RC suppressor (50
Hz models) across the inductive coil
Remote Setpoint Reset
The chilled liquid leaving temperature setpoint pro-
grammed into the micro can be remotely adjusted to a
higher value using repeated timed closure of dry con-
tacts connected to Terminals 13 & 17 of TB4 in the logic
section of the control panel (see Section 1.9). The du-
ration of the contact closure will decide the amount of
adjustment. This is achieved as follows:
A maximum allowable reset value can be programmed
from 2°F - 40°F, as appropriate to the application see
Section 6.4. Once the maximum reset is programmed,
an input contact closure of 21 seconds gives 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
necessary contact closure time to give a required Re-
set, use the following steps:
1. Reset per sec. (°F) = Programmed Max Reset
20
2. Closure Time (sec.) = Required Reset + 1
Reset Per Sec
For Example:
Programmed Max Reset = 30°F; Required Reset = 12°F
1. Reset per sec. = 30/20 = 1.5°F per sec.
2. Closure Time = (12/1.5) + 1 = 9 seconds
To determine the new setpoints, add the reset to the set-
point programmed into memory. In the example 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 press-
ing the Remote Reset Temperature / Range key.
To maintain a given offset, the contact closure signal must
be repeated every 30 seconds - 30 minutes. The refresh
is not accepted sooner than 30 seconds from the end of
the last PWM signal, but must be refreshed before 30
minutes has elapsed. After 30 minutes, if no refresh is
provided, the setpoint will change back to its original value.
NOTE: After an offset signal, the new Remote Setpoint
may be viewed on the Remote Reset Tempera-
ture 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 Re-
set Temperature Range key. The new setpoint
will then appear.
NOTE: Remote Setpoint Reset will not operate when a
Remote Control Center Option Kit is connected
to the micro. The Remote Control Center will
always determine the setpoint.
NOTE: Wiring from remote dry contact (for reset func-
tions) should not exceed 25 ft. and should be
run in grounded conduit that does not carry any
wiring other than control wiring or in screened
cable. It an inductive device (relay, contactor)
is supplying these contacts, the coil of the de-
vice must be suppressed with a suppressor
YORK Part Number 031-00808-000 (60 Hz
models) or a standard RC suppressor (50 Hz
models) across the inductive coil.
To program 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 programmed
by the CHILLED LIQUID TEMP/RANGE key plus the
offset from the remote reset signal. The display will also
show the REM RANGE which is the same as the maxi-
mum reset required by the application. Key in the maxi-
mum reset required for the application after REM
S Y S
1
E M S
L I M I T I N G
S Y S
2
E M S
L I M I T I N G
R E M
S E T P O I N T
=
2 0 . 0
R E M
R A N G E
=
4 0
º
F
