Specifications

88
Chiller Control Module (CCM) (Fig. 41)
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 out-
put. Refer to the chiller wiring diagram for your specific appli-
cation for the correct terminal numbers.
Integrated Starter Module (Fig. 42)
INPUTS — Inputs on strips J3 through J6 are analog inputs
and J2 is discrete (on/off) input. The specific application of the
chiller determines which terminals are used. Refer to the indi-
vidual chiller wiring diagram for the correct terminal numbers
for your application.
OUTPUTS — Outputs are 115-277 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. Follow the procedures
described in the Software Configuration section on page 55.
INSTALLATION
1. Verify the existing CVC module is defective by using the
procedure described in the Troubleshooting Guide sec-
tion, page 76, and the Control Modules section, page 87.
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 pro-
cedures 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
COMPRESSOR 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
softkey. Increase or decrease the value to match the starts
value recorded in Step 3. Press the softkey
when you reach the correct value. Now, move the high-
light bar to the COMPRESSOR ONTIME parameter.
Press the softkey. Increase or decrease the run
hours value to match the value recorded in Step 2. Press
the softkey when the correct value is reached.
9. Complete the CVC installation. Following the instruc-
tions in the Input Service Configurations section, page 55,
input all the proper configurations such as the time, date,
etc. Check the pressure transducer calibrations. PSIO
installation is now complete.
Solid-State Starters —
Troubleshooting information per-
taining to the Benshaw, Inc., solid-state starter may be found
in the following paragraphs and in the Carrier RediStart
MICRO™ Instruction Manual supplied by the starter vendor.
Attempt to solve the problem by using the following prelim-
inary checks before consulting the troubleshooting tables found
in the Benshaw manual.
With power off:
• Inspect for physical damage and signs of arcing, over-
heating, 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 procedure 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 measurements
are within specified limits, the SCRs are functioning nor-
mally. If after completing Steps 4 - 11 resistance measure-
ments 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 re-
sistance measurements are being influenced by the motor
windings.
4. Remove power from the starter unit.
Electrical shock can cause personal injury. Disconnect all
electrical power before servicing.
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.
SELECT
ENTER
SELECT
ENTER