294
FORM 160.54-M1
ISSUE DATE: 10/25/2019
SECTION 33 - SYSTEM CALIBRATION, SERVICE SETPOINTS, AND RESET PROCEDURES
JCI COMPANY CONFIDENTIAL
JOHNSON CONTROLS
1. Shutdown chiller and place COMPRESSOR start/
Stop Switch in the Stop-Reset position.
2. At the keypad, log in at SERVICE access level,
using password 1 3 8 0.
3. Select SETPOINTS/SETUP/OPERATIONS screen.
4.
Use ◄ and ► keys to select Enable or Disable as
required.
5. Press ENTER (
)
key.
VGD Count
The VGD Count is displayed on the VGD Screen. It
is the number of times the Stall Detector Board output
goes above the High Limit setpoint. This count can be
cleared as follows:
1. At the keypad, log in at ADMIN access level.
2. Select COMPRESSOR/VGD/VGD SETPOINTS
Screen.
3. Using numeric keypad keys, enter desired number.
4. Press ENTER (
) key.
Setpoints
The following are the setpoints and range of program-
mable values. The DEFAULT value is shown in paren-
theses. The default value is the recommended value and
should provide proper operation in most applications.
However, the setpoint can be programmed to other val-
ues to compensate for local operating conditions.
A. Surge Reaction Time - 1 to 30 seconds (5)
B. PRV Offset – 0 to 5% (3)
C. Probe Wait Time – 0.5 to 15 minutes (10)
D. Open Pulse – 1 to 9 seconds (2)
E. High Limit – 0.5 to 1.2 VDC (0.6V; 0.8V with
software version C.OPT.01.22.307 and earlier))
F. Low Limit – 0.4 to 0.8 VDC (0.5V; 0.6V with
software version C.OPT.01.22.307 (and earlier))
G. Extreme Stall Duration – 10 to 20 minutes (10)
(Software version C.MLM.01.14.xxx (and later)
or C.OPT.01.14.306 (and later))
H. PRV VGD Inhibit – 40% to 100% (100%; 95%
with software version C.OPT.01.22 (and earlier))
(Software version C.MLM.01.14.xxx (and later)
or C.OPT.01.14.306 (and later))
Use the following procedure:
1. At the keypad, log in at SERVICE access level
using access code 1 3 8 0.
2. Select COMPRESSOR/VGD/VGD SETPOINTS
Screen.
3. On the VGD SETPOINTS Screen, press the ap-
propriate key to select the setpoint to be pro-
grammed.
4. Using the numeric keypad keys, enter the desired
value.
5. Press ENTER (
) key.
Manual Control
The VGD can be manually controlled as follows:
1. At the keypad, log in at SERVICE access level
using access level code 1 3 8 0.
2. Select VARIABLE GEOMETRY DIFFUSER
Screen from the COMPRESSOR Screen.
3. On the VARIABLE GEOMETRY DIFFUSER
Screen, press the OPEN, CLOSE or HOLD key
as desired. Each time the OPEN or CLOSED key
is pressed, the respective output is energized for
2 seconds and the respective LED illuminates for
2 seconds. Pressing the HOLD key causes the
HOLD LED to illuminate and the VGD to be held
in its present position with. Pressing the AUTO
key invokes automatic operation.
Pre-rotation Vanes Calibration
There is one procedure for all Pre-rotation Vanes
(PRV) calibrations. The following procedure applies to
the Compressor Motor Variable Speed Drive (VSD),
Hot gas bypass, Variable Geometry Diffuser and any
other PRV calibration.
1. Place the COMPRESSOR switch in the Stop-
Reset position (O) and wait until the System
Coastdown is complete.
2. At the keypad, login at SERVICE access level.
3. Select the PRE-ROTATION VANES CALI-
BRATE screen from the COMPRESSOR screen.
4. The pot should be initially set so that the feed-
back at the fully closed PRV position is 0.3 VDC
to 0.7 VDC. Press the START CALIBRATION
key to initiate the calibration. The CALIBRA-
TION IN PROGRESS and PRV OPENING LED