Page 19
XP17
Component Field Configuration and
Troubleshooting
FAN MOTOR CONTROL (A177)
This section provides procedures for testing the fan
control.
FAN MOTOR CONTROL LED CODES AND
SEQUENCE OF OPERATIONS
During start up, the LED:
1. Display error conditions (see table 9), if present
2. If no errors are detected, then the LED code indicating
stage operation (see table 10) will display the
applicable code and then a long pause.
3. The fan motor speed / RPM (revolutions per minute)
indicator is displayed next (see table 8).
4. After the RPM indicator is displayed, there is a short
pause. The sequence repeats if a thermostat demand
is still present. See figure 8 for LED sequence. See
table 10 for description of flash and pause durations.
FAN MOTOR CONTROL TROUBLESHOOTING
Use the following subsections to verify and test the fan
motor control (A177).
Verifying Jumper Settings (J2)
The unit is shipped from the factory with the default fan
motor speed setting (in RPMs) required for each specific
model. Use the table 8 verify that jumpers are set correctly
for the specific unit.
Verifying LED Status Codes
During start up, the fan motor control (A177) LED will
display any error conditions. If error conditions exist
then no other codes will display. If no error
conditions are present, then the stage status and
and RPM indicator are displayed.
Fan motor speeds
are not adjustable for a single stage outdoor unit (see
table 8).
Verifying Correct DC Output Voltage (J2)
The following three methods can be used to determine
whether the fan motor (B4) is operating at the correct
RPMs based on unit size.
1. Use the information provided in table 8 to verify that all
four jumper terminals are set correctly for the specific
size unit.
2. Verify LED RPM indicator is displaying the correct flash
sequence for the applicable size unit (see table 10).
3. Test DC voltage output on the fan motor control's J2
terminals (see figure 9) while under full load and verify
the voltage read to the voltage listed in table 8 for the
applicable size unit.
4. If no voltage is detected at the
J2
terminals, verify there
is a Y1 demand at the thermostat and applicable
voltages detected all fan motor control (A177) voltage
inputs, see table 7.
If there is a demand, proceed to the next section for further
testing.
Verifying Correct Input Voltage (ECM/Y1,
ECM/Y2, ECM C and EXT ECM/R)
Using a voltmeter, check voltages on the following fan
motor control inputs using table 7. Voltage will only be
present during a thermostat demand. See figure 10 for test
example.
If correct voltages are detected at applicable inputs during
a demand, and no voltage is present at the J2 terminals,
then fan motor control should be replaced.
Table 7. Fan Motor Control Voltage Inputs
Input
Call for
Cooling
Voltage
Present
ECM/Y1 and ECM C
YES
Between
24VDC and 32
VDC
NO
NONE
EXT ECM/R and ECM C
YES
24VAC
NO
NONE
Summary of Contents for iComfort SL18XC1 Series
Page 44: ...Page 44 XP17 Figure 21 Typical XP17 Wiring XP17 XX 230 06...
Page 45: ...Page 45 XP17 Factory Wiring Diagrams Figure 22 Typical Factory Wiring XP17 XX 230 01...
Page 46: ...Page 46 XP17 Figure 23 Typical Factory Wiring XP17 XX 230 02...
Page 47: ...Page 47 XP17 Figure 24 Typical Factory Wiring XP17 XX 230 03 and 05...
Page 48: ...Page 48 XP17 Figure 25 Typical Factory Wiring XP17 XX 230 06...
