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XC21
Table 12. Fan Motor Control (A177) Flash and Pause Durations XC21−XXX−230−05 AND LATER
Flash or Pause State Duration
Flash Flash Three flashes per second
Slow Flash One flash per second
Short Pause Two seconds of OFF time.
Long Pause Five seconds of OFF time.
Table 13. Fan Motor Control Error/Fault LED Codes XC21−XXX−230−05 AND LATER
Unit Status Fan Motor Control LED Possible Cause
Mismatched RPM Fast Flash with no pause
Internal feedback, PWM does not match tar-
get.
CRC Failure Constant ON. Microcontroller CRC failure.
Table 14. Fan Motor Control Stage Operation LED Indicator Codes XC21−XXX−230−05 AND LATER
Unit Status Unit Status Fan Motor Control LED
Two Stage Operation
Low Stage ECM1/Y1 ONLY One slow flash, then short pause.
High Stage ECM1/Y1 and ECM2/Y2 Two slow flash, then short pause.
EDA Operation ECM2/Y2 ONLY Three slow flash, then short pause.
Table 15. Two Stage Fan Motor Control RPM Jumper Settings, LED RPM Indicator and P2 DC
Voltage Outputs XC21−XXX−230−05 AND LATER
Application
CFM Profile Pin Select
Low Stage ECM1/Y1
Only
High Stage ECM1/Y1
and ECM2/Y2
EDA Operation
ECM2/Y2 Only
4 3 2 1 RPM
LED
Code
DC
Volt
RPM
LED
Code
DC
Volt
RPM
LED
Code
DC
Volt
XC21−024 ON ON OFF OFF 475 6 15.1 550 8 17.6 200 3 6.3
XC−036 ON OFF ON ON 525 7 16.8 600 8 19.2 225 3 7.0
XC21−048 and
XC21−060
ON OFF OFF ON 600 8 19.2 675 9 21.6 225 3 7.0
* LED Code indicates Fan Motor Control LED flash sequence. For example, LED Code 9 indicates 9 slow flashes and pause.
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