FORM 160.54-PW7
13
YORK INTERNATIONAL
FIG. 21 – MICROBOARD DIP SWITCH FOR POWER
FAILURE RESTART
This figure shows the location of the Power Failure
Restart Dip Switch on the Microboard. The
Microboard is mounted on the rear panel located di-
rectly behind the OptiView Control Center door.
1. Power Failure Restart Dip Switch - The Con-
trol Panel is furnished for Manual Restart After
Power Failure as a standard function. The Control
Panel can be field-changed to Automatic Restart
after a power failure if the Manual Restart fea-
ture is not desired. Simply place position 5 of the
12-position Dip Switch (SW1) on ON and the Au-
tomatic Restart feature will be enabled. Place to
the OFF position to return to Manual Restart.
2. English/Metric Display Units Configuration –
The Control Panel can present data on the Graphic
Display in English or Metric Units. In Operator Ac-
cess Level, from the HOME screen, press the
“Setpoints” key to go to the SETPOINTS screen.
Next, press the “Setup” key to go to the SETUP
screen. Press the “User” key to go the USER
J19
J20
J15
SW
1
50
49
6
3
1
1
1
2
3
4
5
6
7
8
9
10
11
12
OFF
1
J2
N.C.
GND
GND
GTX
GRX
DTRI
TXDI
RXDI
DSRI
N.C.
N.C.
GND
R12
DTR2
CTS2
TXD2
RTS2
RXD2
DSR2
DCD2
1
J13
JP34
JP35
JP36
JP37
J5
J18
J6
1
1
1
J22
J21
J7
J8
J9
1
2
3
4
12
24
13
1
1
1
1
1
JP24 JP23 JP22 JP21
JP41
JP42
JP40
JP40
JP40
JP39
1
11
22
12
20
10
1
11
1
1
4
5
1
J1
J10
J11
1
JP27
1
SHLD
GND
+
_
5V
J11
SHLD
GND
+
_
5V
J11
SHLD
GND
+
_
5V
J12
SHLD
GND
+
_
5V
MICROBOARD
031-01730
1
PC/104
2
1
J17
J16
FIG. 21 – MICROBOARD DIP SWITCH FOR AUTO/
MANUAL RESTART AFTER POWER
FAILURE
LD04396
LD06833
FIG. 20 – REMOTE LEAVING CHILLED LIQUID TEM-
PERATURE SETPOINT WITH PWM SIGNAL
PWM – The Pulse Width Modulation input is in the
form of a 1 to 11 second relay contact closure that ap-
plies 115VAC to the I/O Board TB4-19 for 1-11 sec-
onds. As shown in Fig. 20, connect dry closure relay
contacts between I/O Board TB4-19 (input) and TB4-1
(115VAC). A contact closure time (pulse width) of 1
second produces a 0°F offset. An 11 second closure
produces the maximum allowed offset (10 or 20°F above
the local setpoint value). The relay contacts should close
for 1 to 11 seconds at least once every 30 minutes to
maintain the setpoint to the desired value. If a 1 to 11
second closure is not received within 30 minutes of the
last closure, the setpoint is defaulted to the Local setpoint
value. A closure is only accepted at rates not to exceed
once every 70 seconds. This input will only be accepted
in “Digital” Remote Mode. Calculate the setpoint
for various pulse widths as follows:
OFFSET(°F) =
(PULSE WIDTH IN SECONDS)(REMOTE RESET TEMP. RANGE)
10
SETPOINT(°F) = LOCAL SE OFFSET
For example, if the relay contacts close for 5 seconds
and the Remote Reset Temp Range setpoint is pro-
grammed for 10°F, and the Local Leaving Chilled Liq-
uid Temperature setpoint is programmed for 40°F, the
setpoint would be set to 44°F as follows:
OFFSET (°F)
= (5 – 1)(10)
10
= (4)(10)
10
= 40
10
= 4°F
SETPOINT (°F)
= 40 + 4
= 44°F