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JOHNSON CONTROLS
134
FORM 150.62-NM8 (1020)
SERVICE AND TROUBLESHOOTING
System 1 Low Pressure Switch
J7-5 = +5VDC regulated supply to low pressure
switch.
J7-10 = input signal to the I/O Board. 0VDC = open
switch / +5VDC = closed switch.
J7-1 = drain (shield connection = 0VDC)
System 2 Low Pressure Switch
J9-5 = +5VDC regulated supply to low pressure
switch.
J9-10 = input signal to the I/O Board. 0VDC = open
switch / +5VDC = closed switch.
J9-1 = drain (shield connection = 0VDC)
Digital Outputs
Refer to the unit wiring diagram and Fig. 14.
The digital
outputs are located on TB7, TB8, TB9 and TB10 of the
I/O Board. All outputs are 120VAC with the exception
of TB8-6 to TB8-7 which are the contacts that can be
used for a remote evaporator pump start signal. The
voltage applied to either of these terminals would be
determined by field wiring.
Each output is controlled by the microprocessor by
switching 120VAC to the respective output connection
energizing contactors, evaporator heater, and solenoids
according to the operating sequence.
120VAC is supplied to the I/O Board via connections
at TB7-1, TB7-6, TB10-1, TB10-6, TB8-1 and TB9-1.
Figure 14 illustrates the relay contact architecture on
the I/O Board.
FIG. 14 – I/O BOARD RELAY CONTACT
ARCHITECTURE
SYS 1
COMP 1
SYS 1
COMP 1
TB7-2
SYS 1
COMP 2
TB7-4
SYS 1
COMP 3
TB7-5
TB7-3
LLSV 1
TB8-6
EVAP
PUMP
TB8-7
TB7
SYS 2
HGSV
TB10-7
SYS 2 FAN 2
LOW AMBIENT
SYS 2
FAN 2
TB10-8
TB10-9
TB10-10
SYS 2
FAN 4
TB10
TB8
TB10
SYS 2
COMPR 1 (4)
TB10-2
LLSV 2
TB10-3
SYS 2
COMPR 2 (5)
TB10-4
SYS 2
COMPR 3 (6)
TB10-5
TB7
SYS 1
HGSV
TB7-7
SYS 1
FAN 3
TB7-9
SYS 1
FAN 1 LOW
AMBIENT
TB7-10
TB7-8
SYS 1
FAN 1
TB8-2
HEAT EXCH
HEATER
SYS 1
COMP 2
SYS 1
COMP 3
LLSV 1
EVAP
PUMP
SYS 2
HGSV
SYS 2 FANS
2 & 4
SYS 2
FAN 8
SYS 2
FAN 6
SYS 2
COMPR 1 (4)
LLSV 2
SYS 2
COMPR 2 (5)
SYS 2
COMPR 2 (6)
SYS 1
HGSV
SYS 1
FAN 5
SYS 1
FANS 1 & 3
SYS 1
FAN 7
HEAT EXCH
HEATER
YCAL 0014-0080
YCAL 0090-0134
LD13954
Summary of Contents for YCAL0014E Series
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