JOHNSON CONTROLS
146
FORM 150.66-NM3
ISSUE DATE: 09/25/2020
SECTION 9 - SERVICE AND TROUBLESHOOTING
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 ac-
cumulated run and start timers for each system. All val-
ues 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 microproces-
sor will display the rst programmable value under the
PROGRAM key.
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
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 ↓ (Down) arrow
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.
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 suction pressure transducer is optional on YCAL0041 -
YCAL0071. 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.
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 P R J 7 ‑ 1 0
2 . 1 V D C = 8 1 P S I G
This example indicates that the system 1 suction pres-
sure input is connected to plug 7 - pin 10 (J7-10) on the
microboard. It indicates that the voltage is 2.1 volts dc
which corresponds to 81 psig (5.6 bars) 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 S T A R T
J 13 ‑ 5 I S O N
This indicates that the ow switch/remote start input is
connected to plug 13- pin 5 (J13-5) on the microboard,
and is ON (ON = +30VDC unregulated input, OFF =
0VDC input on digital inputs).
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