15
3.
IND: Humidifier will cycle with any active call for
humidification from the thermostat (independent of
a heat call). The relay will remain open during
cooling operation. This mode also allows the user to
select one of 4 fan speeds (25, 50, 75, and 100%).
The fan speed will be used when the system is in an
idol state and a call for humidification is made by
the thermostat.
NOTE:
If “HUM” is selected in Accessary setting (ACC) menu, Hu-
midity Setting (HUM) will appear on set-up menu. If “IND” is then
selected under the HUM menu, Humidity Airflow (HUM FAN SPD
(%)) will appear on the set-up menu. Correct values must be set to
use humidifier. Default Factory setting of HUM is OFF.
(W/BLWR) With Blower
When the Accessory Relay is setup as With Blower, the
relay will be closed anytime the blower is running.
15 TROUBLESHOOTING
15.1 Electrostatic Discharge (ESD) Precautions
NOTE:
Discharge body’s static electricity before touching unit.
An electrostatic discharge can adversely affect electrical
components.
Use the following precautions during air handler installation
and servicing to protect the integrated control module from
damage. By putting the air handler, the control, and the per-
son at the same electrostatic potential, these steps will help
avoid exposing the integrated control module to electrostatic
discharge. This procedure is applicable to both installed and
uninstalled (ungrounded) blowers.
1. Disconnect all power to the blower. Do not touch the inte-
grated control module or any wire connected to the con-
trol prior to discharging your body’s electrostatic charge
to ground.
2. Firmly touch a clean, unpainted, metal surface of the air
handler blower near the control. Any tools held in a
person’s hand during grounding will be discharged.
3. Service integrated control module or connecting wiring fol-
lowing the discharge process in step 2. Use caution not to
recharge your body with static electricity; (i.e., do not move
or shuffle your feet, do not touch ungrounded objects, etc.).
If you come in contact with an ungrounded object, repeat
step 2 before touching control or wires.
4. Discharge your body to ground before removing a new con-
trol from its container. Follow steps 1 through 3 if install-
ing the control on a blower. Return any old or new con-
trols to their containers before touching any ungrounded
object.
ACCESSORY CONTACTS
Figure 17
ACC-IN
(TB 6)
ACC-OUT
(TB 8)
Peripheral devices to be
linked (Example: Humidifier)
10A max: 250VAC
5A max: 30VDC
Faston Size: 250
7 Segment
Diagnostic
Displays
Fault
Recall
Figure 18
15.2 Diagnostic Chart
Refer to the
Troubleshooting Chart
at the end of this manual
for assistance in determining the source of unit operational
problems. The 7 segment LED display will provide any active
fault codes. An arrow printed next to the display indicates
proper orientation (arrow points to top of display). See fol-
lowing image.
15.3 Fault Recall
The integrated control module is equipped with a momentary
push-button switch that can be used to display the last six
faults on the 7 segment LED display. Follow the sequence to
use the feature. The control must be in Standby Mode (no
thermostat inputs)
.
1.
Press FAULT RECALL button for 2 to 5 seconds
*
, so that
7 segment blinks “- -”.
2.
Release FAULT RECALL button in this period, 7 seg-
ment display shows the most recent fault.
