61
XC25
VDC Voltage Check:
Check for VDC out of Fan PWM and COM. VDC output reading is determined by the percentage of room thermostat de
mand.
1. No voltage present – Remove wires from control and check for VDC. If there is no voltage present, then replace out
door control.
2. Voltage present – Perform a 9-volt battery test on motor (see figure 47).
BROWN LEAD
BLACK LEAD
CONNECT B4 FAN MOTOR BLACK
COMMON WIRE TO 9V BATTERY
NEGATIVE TERMINAL
FULLY CHARGED 9V BATTERY
NEGATIVE TERMINAL
POSITIVE TERMINAL
CONNECT B4 FAN MOTOR WIRE
TO 9V BATTERY POSITIVE
TERMINAL
V
Figure 47. VDC Voltage Check
STATUS OR ERROR CODES:
There is no feedback from the outdoor fan motor to the outdoor control therefore no status or error codes are displayed on
either the outdoor control or iComfort Wi-Fi
®
room thermostat.
NOTE - If the outdoor fan does not operate at the correct RPM, or does not start, the system will shut be down by other
protection components such as the high and low pressure switches which will generate error code(s).
Ferrites
Electronic cabling and wires, by virtue of their lengthtowidth ratios, are perfect natural antennas. In the presence of
highspeed microprocessor signals, cables will conduct, radiate, and receive unwanted highfrequency signals. Use an in
sertion-loss device, such as a ferrite suppressor as shown below, to control radio-frequency (RF) interference.
Ferrites are consistently stable over time and
over wide temperature ranges, and provide RF
suppression without causing large current
losses.
Figure 48. Ferrites
