Chiller Control Module (CCM) (Fig. 37)
INPUTS — Each input channel has 2 or 3 terminals. Refer
to individual chiller wiring diagrams for the correct terminal
numbers for your application.
OUTPUTS — Output is 24 vac. There are 2 terminals per
output. Refer to the chiller wiring diagram for your specific
application for the correct terminal numbers.
Integrated Starter Module (Fig. 38)
INPUTS — Inputs on strips J3-5 and J3 are analog and dis-
crete (on/off) inputs. The specific application of the chiller
determines which terminals are used. Refer to the individual
chiller wiring diagram for the correct terminal numbers for
your application.
OUTPUTS — Outputs are 24 vac and wired to strip J9. There
are 2 terminals per output.
Replacing Defective Processor Modules —
The
module replacement part number is printed on a small label
on the rear of the CVC module. The chiller model and
serial numbers are printed on the chiller nameplate located
on an exterior corner post. The proper software is factory-
installed by Carrier in the replacement module. When
ordering a replacement chiller visual control (CVC) module,
specify the complete replacement part number, full chiller
model number, and chiller serial number. The installer must
configure the new module to the original chiller data. Fol-
low the procedures described in the Software Configuration
section on page 53.
Electrical shock can cause personal injury. Disconnect
all electrical power before servicing.
INSTALLATION
1. Verify the existing CVC module is defective by using
the procedure described in the Troubleshooting Guide
section, page 69, and the Control Modules section,
page 80. Do not select the ATTACH TO NETWORK
DEVICE table if the CVC indicates a communication
failure.
2. Data regarding the CVC configuration should have been
recorded and saved. This data must be reconfigured into
the new CVC. If this data is not available, follow the
procedures described in the Software Configuration
section.
If a CCN Building Supervisor or Service Tool is avail-
able, the module configuration should have already been
uploaded into memory. When the new module is in-
stalled, the configuration can be downloaded from the
computer.
Any communication wires from other chillers or CCN
modules should be disconnected to prevent the new CVC
module from uploading incorrect run hours into memory.
3. To install this module, record values for the TOTAL COM-
PRESSOR STARTS and the COMPRESSOR ONTIME
from the MAINSTAT screen on the CVC.
4. Power off the controls.
5. Remove the old CVC.
6. Install the new CVC module. Turn the control power
back on.
7. The CVC now automatically attaches to the local net-
work device.
8. Access the MAINSTAT table and highlight the TOTAL
COMPRESSOR
STARTS
parameter.
Press
the
SELECT softkey. Increase or decrease the value to
match the starts value recorded in Step 3. Press the
ENTER softkey when you reach the correct value. Now,
move the highlight bar to the COMPRESSOR ONTIME
parameter. Press the SELECT softkey. Increase or de-
crease the run hours value to match the value recorded
in Step 2. Press the ENTER softkey when the correct
value is reached.
9. Complete the CVC installation. Following the instruc-
tions in the Input Service Configurations section,
page 53, input all the proper configurations such as the
time, date, etc. Check the pressure transducer calibra-
tions. PSIO installation is now complete.
Solid-State Starters —
Troubleshooting information
pertaining to the Benshaw, Inc., solid-state starter may be
found in the following paragraphs and in the Carrier RE-
DISTART MICRO Instruction Manual supplied by the starter
vendor.
Attempt to solve the problem by using the following pre-
liminary checks before consulting the troubleshooting tables
found in the Benshaw manual.
1. Motor terminals or starter output lugs or wire should
not be touched without disconnecting the incoming
power supply. The silicon control rectifiers (SCRs)
although technically turned off still have AC mains
potential on the output of the starter.
2. Power is present on all yellow wiring throughout the
system even though the main circuit breaker in the
unit is off.
With power off:
• Inspect for physical damage and signs of arcing, overheat-
ing, etc.
• Verify the wiring to the starter is correct.
• Verify all connections in the starter are tight.
• Check the control transformer fuses.
TESTING SILICON CONTROL RECTIFIERS IN THE
BENSHAW, INC., SOLID-STATE STARTERS — If an SCR
is suspected of being defective, use the following pro-
cedure as part of a general troubleshooting guide.
1. Verify power is applied.
2. Verify the state of each SCR light-emitting diode (LED)
on the micropower card.
NOTE: All LEDs should be lit. If any red or green side
of these LEDs is not lit, the line voltage is not present
or one or more SCRs has failed.
3. Check incoming power. If voltage is not present check
the incoming line. If voltage is present, proceed to
Steps 4 through 11.
NOTE: If after completing Steps 4 - 11 all mea-
surements are within specified limits, the SCRs are
functioning normally. If after completing Steps 4 - 11
resistance measurements are outside the specified
limits, the motor leads on the starter power lugs T1 through
T6 should be removed and the steps repeated. This will
identify if abnormal resistance measurements are being
influenced by the motor windings.
4. Remove power from the starter unit.
81
Summary of Contents for HERMETIC CENTRIFUGAL LIQUID CHILLERS 19XR
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