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5. If there is a full voltage signal,
and if the ground wire is
properly connected, check the
voltage at the Fan Card. Be
sure that you have 18-28.5
VAC at the 24 VAC terminals. If
you do not have voltage at this
point, check the transformer
and/or 24 VAC control voltage.
7. Check between "COM" and
"PWM" (0-100% duty cycle).
Depending on the input signal, it
should be a modulating voltage
between 0 and 24 VDC. (A 0
PWM signal will turn the motor
off). Turn the potentiometer to
check this. If you do not have
the proper voltage at this point,
change the Fan Card.
8. If all the voltages check out, it is
possible that the pins may not
be connecting properly and it
may be a good idea to recheck
them at the plug near the motor.
If there is a voltage discrepancy
anywhere else, each source
should be verified for proper
voltage readings. Plug both
cables back into the motor, turn
on the power and wait for the
motor to start.
TROUBLESHOOTING IN AUTO/
DYNAMIC "0 -10VDC" MODE
1. Confirm the jumper on the
Fan Card is in the "0-10VDC"
position for dynamic fan speed
control via the unit controller
signal (BAS).
2. Check to verify that the unit
controller leads are properly
connected to the Auto Input
Signal terminal "+" & "-" at the
2 or 4 pin terminal dependent
on model. Ensure that an
analog
signal
from
VDC" is present at the "+" &
"-" terminals at the Fan Card.
Correct connections or verify
operation of controller, correct
where needed. If "0-10VDC"
signal is present at Fan Card
move to step 3.
3. Check
steps
2
–
TROUBLESHOOTING
MANUAL ADJUST MODE.
Page 2 of 2
" C o m p l e t e A i r C o n t r o l a n d D i s t r i b u t i o n S o l u t i o n s . "
LINE
GND
MANUAL
TUNING POT.
MANUAL/
0-10V JUMPER
AUTO INPUT
SIGNAL
(0-10 VDC)
IF REQUIRED
LINE
GND
MANUAL
TUNING POT.
MANUAL/
0-10V JUMPER
AUTO INPUT
SIGNAL
(0-10 VDC)
IF REQUIRED
FAN STATUS
(ON/OFF)
CONTACT
CLOSURE
SIGNAL FOR
REMOTE BAS
(RLY/RLY)
LINE
"0-10
GND
MANUAL
TUNING POT.
MANUAL/
0-10V JUMPER
AUTO INPUT
SIGNAL
(0-10 VDC)
8
in
IF REQUIRED
IN
FAN STATUS
(ON/OFF)
CONTACT
CLOSURE
SIGNAL FOR
REMOTE BAS
(RLY/RLY)
Figure 1. EPIC
Single Motor Card. (H1-2272)
TM
Figure 2. EPIC
Single Motor Card with Fan Status
TM
and Electric Heat Relays. (H1-2272A1)
Figure 3. EPIC
Dual Motor Card with Fan Status
TM
and Electric Heat Relay. (H1-2273A1)
Houston, Texas
Las Vegas, Nevada
Tel: 281-590-1172
Tel: 702-648-5400
Fax: 281-590-3086
Fax: 702-638-0400
LED (AIRFLOW COUNT)
COM (OUT + )
COM (OUT - )
BK (PWM)
COM
G (RUN/STOP) GRN
(WIRING HARNESS TO MOTOR)
VOLTMETER TEST
TERMINALS (+/-)
LED (AIRFLOW COUNT)
COM (OUT + )
COM (OUT - )
BK (PWM)
COM
G (RUN/STOP) GRN
(WIRING HARNESS TO MOTOR)
VOLTMETER TEST
TERMINALS (+/-)
ELECTRIC HEAT
INTERLOCK RELAY (J5/J6)
LED (AIRFLOW COUNT)
COM (OUT + )
COM (OUT - )
BK (PWM)
COM
G (RUN/STOP) GRN
(WIRING HARNESS TO MOTOR)
VOLTMETER TEST
TERMINALS (+/-)
COM (OUT + )
COM (OUT - )
BK (PWM)
COM
G (RUN/STOP) GRN
ELECTRIC HEAT
INTERLOCK RELAY (J5/J6)
Toronto, Canada
Calgary, Canada
Tel: 416-744-3300
Tel: 403-279-8619
Fax: 416-744-3360
Fax: 403-279-5035
9/19
IOM-EPIC/ECM-EONK
w w w . n a i l o r . c o m
WHT
BRN
RED
BLK
WHT
BRN
RED
BLK
WHT
BRN
RED
BLK
WHT
BRN
RED
BLK
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