15
Humidifier Relay
For the setup for humidification functionality, the ac
-
cessory terminals have 3 operational modes.
1. ON: Humidifier is only enabled during a call for
heat. During a heat call the accessory relay will
close only if there is an active call for humidifi
-
cation from the thermostat. Otherwise, the relay
will be open.
2. OFF: Humidifier remains off (relay never closes).
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 hu-
midification is made by the thermostat.
16 TROUBLESHOOTING
16.1 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 installa-
tion and servicing to protect the integrated control module
from damage. By putting the air handler, the control, and
the person 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
integrated control module or any wire connected to the
control 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
following the discharge process in step 2. Use cau-
tion 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
control from its container. Follow steps 1 through 3 if
installing the control on a blower. Return any old or
new controls to their containers before touching any
ungrounded object.
16.2 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.
ACCESSORY CONTACTS
Figure 18
ACC-IN
(TB 6)
ACC-OUT
(TB 8)
Peripheral devices to be
linked (Example: Humidi
fi
er)
10A max: 250VAC
5A max: 30VDC
Faston Size: 250
7 Segment
Diagnostic
Displays
Fault
Recall
Figure 19
16.3 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 display shows “- -”.
2. Release FAULT RECALL button in this period, 7
segment display shows the most recent fault.
3. Each time FAULT RECALL button is pressed after
that
**
, 7 segment display outputs next occurred fault.
4. After displaying the series of recent faults, 7 seg-
ment displays blink “- -” and goes back to Standby
Mode.
To clear the error code history:
1. Press FAULT RECALL button for 10 to 15 seconds
***
,
so that 7 segment displays blink “- -”.
2. Release FAULT RECALL button in this period, 7
segment displays show “88” and faults are cleared.
NOTE:
* If FAULT RECALL button is not pressed long enough (for 2 to 5
seconds), control goes back to Standby Mode.
If the FAULT RECALL button is pressed for 5 to 10 seconds, control
goes back to Standby Mode.
** Consecutively repeated faults are displayed a maximum of three times.
*** If FAULT RECALL button is pressed for longer than 15 seconds, control
goes back to Standby Mode.
DV*PEC MODELS
DIP Switch
Setting
MODEL
DV25PECB14
DV37PECC14
DV59PECD14
DV61PECD14
First Valid
Heater Kit
3
5
5
5
Second Valid
Heater Kit
5
6
6
6
Third Valid
Heater Kit
6
8
8
8
Fourth Valid
Heater Kit
8
10
10
10
Fifth Valid
Heater Kit
10
15
15
15
Sixth Valid
Heater Kit
19
20
20
Seventh Valid
Heater Kit
25
DV*FEC MODELS
DIP Switch
Setting
MODEL
DV24FECB14
DV36FECC14
DV42FECC14
DV48FECD14
DV60FECD14
First Valid
Heater Kit
3
5
5
5
5
Second Valid
Heater Kit
5
6
6
6
6
Third Valid
Heater Kit
6
8
8
8
8
Fourth Valid
Heater Kit
8
10
10
10
10
Fifth Valid
Heater Kit
10
15
15
15
15
Sixth Valid
Heater Kit
19
19
20
20
Seventh Valid
Heater Kit
25
HEATER KIT OPTIONS
Table 9
