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SERVICE MODE – INPUTS
After entering the Service Mode, all digital and ana-
log inputs to the microboard can be viewed by pressing
the OPER DATA key. After pressing the OPER DATA
key, the UP ARROW and DOWN ARROW keys are
used to scroll through the analog and digital inputs.
Following is the order of analog and digital inputs that
will appear when sequenced with the ARROW keys:
(ANALOG INPUTS)
SYS 1 *SUCT PRESSURE
SYS 1 SPARE
SYS 1 **DISCH PRESSURE
SYS 1 SUCT TEMP (YCUL ONLY)
SYS 2 SUCT TEMP (YCUL ONLY)
SPARE
SPARE
AMBIENT AIR
LEAVING LIQUID
DISCHARGE AIR TEMP
SYS 2 *SUCTION PRESSURE
SYS 2 SPARE
SYS 2 **DISCH PRESSURE
SYS 1 GRND FLT
SYS 2 GRND FLT
(DIGITAL INPUTS)
PWM TEMP RESET INPUT
LOAD LIMIT INPUT
FLOW SW / REM START
SYS 2 ZONE THERM (YCUL ONLY)
SINGLE SYSTEM SELECT
SYS 1 MP / HPCO INPUT
SYS 2 MP / HPCO INPUT
*
The suction pressure transducer is optional on YCUL0016 -
YCUL0066. A low pressure switch is standard on these models
in place of the suction transducer.
** The discharge pressure transducer is optional on all models.
YORK INTERNATIONAL
The analog inputs will display the input connection,
the temperature or pressure, and corresponding input
voltage such as:
S Y S
1
S U C T
2 . 1
V D C
This example indicates that the system 1 suction pres-
sure input is connected to plug 4 - pin 10 (J4-10) on the
microboard. It indicates that the voltage is 2.1 volts
DC which corresponds to 81 PSIG suction pressure.
The digital inputs will display the input connection and
ON/OFF status such as:
F L O W
S W / R E M
J 9 - 5
This indicates that the flow switch/remote start (air
proving switch) input is connected to plug 9- pin 5 (J9-
5) on the microboard, and is ON (ON = +30 VDC un-
regulated input, OFF = O VDC input on digital inputs).
CONTROL INPUTS/OUTPUTS
Tables 26 and 27 are a quick reference list providing
the connection points and a description of the binary
and analog inputs respectively. Table 28 lists the con-
nection points for the outputs. All input and output
connections pertain to the connections at the
microboard.
Figure 13 illustrates the physical connections on the
microboard.
FORM 150.63-NM1
P R
J 4 - 1 0
=
8 1
P S I G
S T A R T
I S
O N
131
4
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