JOHNSON CONTROLS
116
FORM 150.62-NM6 (103)
Service and Troubleshooting
RETURN LIQUID TEMP.
SYS 2 *SUCTION PRESSURE
SYS 2 SPARE
SYS 2 **DISCH PRESSURE
SYS 1 MTR VOLTS
SYS 2 MTR VOLTS
(digital inputs)
PWM TEMP RESET INPUT
LOAD LIMIT INPUT
FLOW SW / REM START
SPARE
SINGLE SYSTEM SELECT
SYS 1 MP / HPCO INPUT
SYS 2 MP / HPCO INPUT
The analog inputs will display the input connection, the
temperature or pressure, and corresponding input volt-
age such as:
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 bars) suction
pressure.
The digital inputs will display the input connection and
ON/OFF status such as:
This indicates that the ow switch/remote start input is
connected to plug 9- pin 5 (J9-5) on the microboard, and
is ON (ON = +30VDC unregulated input, OFF = 0VDC
input on digital inputs).
CONTROL INPUTS/OUTPUTS
Tables 33 through 36 are a quick reference list providing
the connection points and a description of the inputs and
outputs respectively. All input and output connections
pertain to the connections at the microboard.
Figure 13 illustrates the physical connections on the
microboard.
SERVICE MODE – INPUTS
After entering Service Mode (PROGRAM ↓↓), all
digital and analog inputs to the microboard ↑can be
viewed by pressing the OPER DATA key. After press-
ing 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 ↓ (Down) AR-
ROW key:
(analog inputs)
SYS 1 *SUCT PRESSURE
UNIT TYPE
SYS 1 **DISCH PRESSURE
SYS 1*** COOLER INLET REFRIG. TEMP.
SYS 2*** COOLER INLET REFRIG. TEMP.
SYS 1**** SUCTION TEMP.
SYS 2**** SUCTION TEMP.
AMBIENT AIR TEMP.
LEAVING LIQUID TEMP.
F L O W S W / R E M S T A R T
J 9 - 5 I S O N
S Y S 1 S U C T P R J 4 - 1 0
2 . 1 V D C = 8 1 P S I G
* 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 some models.
*** The cooler inlet refrigerant temp. sensor is on R-407c units only.
****The suction temp. sensor is on EEV units only.
SERVICE MODE – CHILLER CONFIGURATION
After the Outputs are displayed, the next group of
displays relate to chiller conguration and start/hour
counters. Data logging, soft start, refrigerant type, and
expansion valve type all must be programmed to match
actual chiller conguration.
Soft start, Refrigerant Type, and Ex-
pansion Valve Type MUST be properly
programmed or damage to compres-
sors and other system components
may result.
Following is a list, in order of appearance:
DATA LOGGING MODE = : DO NOT MODIFY
DATA LOGGING TIMER = : DO NOT MODIFY
SOFT START
REFRIGERANT TYPE
EXPANSION VALVE TYPE
SYS 1 HOURS
SYS 2 HOURS
SYS 1 STARTS
SYS 2 STARTS
The last displays shown on the above list is for the
accumulated run and start timers for each system. All
values can also be changed using the UP and Down
ARROW keys, but under normal circumstances would
not be advised. After the last start display, the micro
will display the rst programmable value under the
PROGRAM key.
↓
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