Ecm Fan Motor Adjustments; Status Leds - Trane 4DCY4024 Installer's Manual

Installer's Guide

ECM Fan Motor Adjustments

If the airflow needs to be increased or decreased, see the
Airflow Table in the SERVICE FACTS. Information on chang-
ing the speed of the blower motor is in the Blower Performance
Table. Blower speed changes are made on the ECM Fan Control
mounted in the control box. The ECM Fan Control controls the
variable speed motor. There is a bank of 8 dip switches, (See
Figure 23 below) located on the board. The dip switches work in
pairs to match the cooling/heat airflow (CFM/TON), Fan off-delay
options and electric heat airflow adjustment. The switches appear
as shown in the figure below.

Status LEDs

IGN Board Diagnostic Codes
There are two LEDs on the IGN board that provide status and
diagnostic information. Refer to Table 7 for a description of the
LED codes.
Status LED
Steady OFF Check Power or Failed Board 2 Flashes
Slow Flash Rate Normal, No Call for Heat
Fast Flash Rate Not used
Steady ON Normal, No Call for Heat
Fast Flash Rate: The LED will flash on for 1/4 second, and off for 1/4 second
Slow Flash Rate: The LED will flash on for 3/4 second, then off for 1/4 second.
The pause between groups of fast flashes is 3 seconds.
Trane
6200 Troup Highway
Tyler, TX 75707
© 2014 Trane
Page 28
Table 7. IGN LED Diagnostic Indicators
IGN Diagnostic Indicators Flash Codes
3 Flashes Pressure switch problem detected
4 Flashes
5 Flashes
6 Flashes Flame Rollout Switch open
7 Flashes Thermostat miswired; W1 & W2
CFM
SELECTION
LIGHT
Figure 23. ECM Fan Control
Liteport LED
System Lockout: Failed to detect or
sustain flame
High Limit switch protection device
open
Flame sensed and gas valve not
energized or flame sensed and no "W"
signal
The manufacturer has a policy of continuous product and product data improvement.
It reserves the right to change design and specification without notice.
DIP
SWITCHES
04/14