Johnson Controls YORK Tempo YLAA Series, Installation Operation & Maintenance

Page: 166 / 192

JOHNSON CONTROLS
166
FORM 150.72-NM1 (1020)
Service and Troubleshooting
Pressing the ↑ (UP) arrow key will energize the liquid
line solenoid valve and “OFF” will change to “ON”
in the display as the LLSV is energized. Energizing
and de-energizing outputs may be useful during
troubleshooting.
SERVICE MODE – CHILLER CONFIGURATION
After the Outputs are displayed, the next group of
displays relate to chiller configuration and start/hour
counters. Data logging, soft start, refrigerant type, pump
control selection and expansion valve type all must be
programmed to match actual chiller configuration.
Soft start (disabled), Refrigerant Type
(R410A), and Expansion Valve Type
(Thermostatic), and North American
Feature (Enabled) MUST be properly
programmed or damage to compres -
sors and other system components may
result.
Following is a list of chiller configuration selections, in
order of appearance:
DATA LOGGING MODE = : DO NOT MODIFY
DATA LOGGING TIMER = : DO NOT MODIFY
SOFT START
REFRIGERANT TYPE
EXPANSION VALVE TYPE
REMOTE TEMP RESET OPTION
REMOTE INPUT SERVICE TIME
FEATURE SET
PUMP CONTROL SELECTION
SYS 1 HOURS
SYS 2 HOURS
SYS 1 STARTS
SYS 2 STARTS
The last displays shown on the above list are 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 required or advised. After the last start
display, the microprocessor will display the first
programmable value under the PROGRAM key.
SERVICE MODE – ANALOG AND DIGITAL
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** 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 discharge pressure transducer is optional on some models.
** 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:
This example indicates that the system 1 suction
pressure input is connected to plug 7 – pin 10 (J7-10)
on the I/O board. It indicates that the voltage is 2.1
VDC which corresponds to 81 PSIG (5.6 bars) suction
pressure.
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