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Control Service and Troubleshooting
SERVICE MODE - INPUTS
After entering the Service Mode, all digital and analog
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
RETURN LIQUID
SYS 2 *SUCTION PRESSURE
SYS 2 SPARE
SYS 2 **DISCH PRESSURE
SYS 1 GRND FLT
SYS 2 GRND FLT
(binary 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 YCAL0014 - YCAL0060. A low pressure switch is standard on these models in place of
the suction transducer.
** The discharge pressure transducer is optional on all models.
90
The analog inputs will display the input connection, the
temperature or pressure, and corresponding input volt-
age 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 (5.6 bar) suction pres-
sure.
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 input is
connected to plug 9- pin 5 (J9-5) on the microboard,
and is ON (ON = +30 vdc unregulated input, OFF = O
VDC input on digital inputs).
CONTROL INPUTS/OUTPUTS
Tables 41 and 42 are quick reference lists providing the
connection points and a description of the binary and
analog inputs respectively. Table 43 lists the connection
points for the outputs. All input and output connections
pertain to the connections at the microboard.
Figure 8 illustrates the physical connections on the
microboard.
P R
J 4 - 1 0
=
8 1
P S I G
S T A R T
I S
O N
YORK INTERNATIONAL
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