Bard MEGA-TEC W090A, Service Instructions Manual

Page: 56 / 159

Manual 2100-671C
Page 54 of 59
C. Check for communication, is the blower
online?
i. Yes. Proceed to Step 3
ii. No. Blower must be removed for wiring
verification and/or replacement.
a. Verify high voltage to blower and
check communication wires for short,
open or grounded circuits. If a wiring
problem is found, make corrections,
re-install and verify communication. If
no problems are found, replace blower
motor.
3. Reconnect the communication wires at the
condenser fan.
4. Is the blower still online?
A. Yes. Proceed to Step 5.
B. No. Reverse the polarity on the communication
wires at the condenser fan motor (see Figure
60). Is the blower online?
i. Yes. Proceed to Step 5.
ii. No. Verify that none of the wires are open,
shorted or grounded. Then disconnect
communication wires at condenser fan
motor. Is the blower online?
a. Yes. Replace condenser fan motor.
b. No. Return to Step 1.
5. Is the condenser fan online?
A. Yes. Proceed to Step 6.
B. No. Reverse the communication wires for the
condenser motor only (at terminal block in
control panel). Is condenser fan online?
i. Yes. Verify blower is still online and
proceed to Step 6.
a. If blower is not online at this point,
double check wiring and/or return to
Step 1.
ii. No. Replace condenser fan.
6. Plug in expansion module (C.PCOe).
7. Are the blower and condenser fan still online?
A. Yes. Proceed to Step 8.
B. No. Reverse the communication wires on the
communication terminal block that is plugged
into the expansion module (C.PCOe). Are the
blower and condenser fan online?
i. Yes. Proceed to Step 9.
ii. No. Unplug the expansion module (C.PCOe)
and verify that the blower and condenser
fan are online. Check wiring very carefully to
confirm no shorts or grounding has occurred.
If unable to establish communication with
the condenser fan and blower while plugged
into the expansion module (C.PCOe), but have
verified that communication is consistent
while not plugged in, the expansion module
(C.PCOe) may be bad. Replace the expansion
module (C.PCOe).
8. Is the expansion module (C.PCOe) online?
A. Yes. Proceed to Step 9.
B. No. Check that the address is set to 2 (see
Figures 65 and 66).
c. Is the expansion module (C.PCOe) online?
i. Yes. Proceed to Step 9.
ii. No. Reverse the communication wires
at the communication terminal block
FIGURE 65
DIP Switch Location
FIGURE 66
Check DIP Switch Position