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Nailor Industries Inc. reserves the right to change any information concerning product or specification without notice or obligation.

OPERATION MANUAL

EPIC FAN CARD VOLUME CONTROLLER 

WITH (GENTEQ EON) ECM MOTOR

Page 1 of 

2

9/19 IOM-EPIC/ECM-EONK

REFER TO FIGURES 1, 2 & 3 AND USE THESE 

INSTRUCTIONS IF YOUR FAN CARD RESEMBLES ONE 

OF THESE. IF YOUR FAN VOLUME CONTROLLER CARD 

LOOKS DIFFERENT, REFER TO another IOM-ECM. This IOM 

refers to Nailor Part #’s H1-2272, H1-2272A1 and H1-2273A1.
LED INDICATORS 
Power Indicator
 – A red LED located on the controller circuit 

board indicates that the control card has 24 VAC present (light 
will illuminate with higher than 18 VAC).
Airflow Indicator – A green LED located on the controller circuit 

board flashes to indicate airflow volume. Each pulse is 100 cfm 
(47.2 l/s). The last pulse is scaled. (ex. ½ pulse = 50 cfm)
RPM Limit Indicator – The green LED (same as airflow 

indicator LED) will stop pulsing bright green and reduce itself 
to a solid, dim glow as an indication that the motor is operating 
at or above the RPM limit for that particular unit. This is not 
an issue for some Nailor models and/or applications and can 
be where the unit is designed to run in normal operation, for 
instance a fan coil with multiple rows and high MERV rating filter 
at maximum cfm of the model. For some models and application 
such as Fan Powered Terminal Boxes where the box is not at 
maximum cfm or multiple rows, this could be an indication that 
filters should be checked for blockage or abnormally high static 
pressure. This would be an indication that the RPM limit has 
been reached. In either case review as needed per application.
SETTING AIRFLOW

(SEE TROUBLESHOOTING SECTION IF ISSUES ARISE)

Setting the Fan Airflow in the Manual Mode
1. Mode Selector Jumper must be in the "Manual" position.
2. Ensure there is a 24 VAC signal at the 24 VAC/GND terminals.
3. Attach the leads of a DC voltmeter to the "TP1+" and "TP2-"

pads on the Fan Card. Read the DC volts.

4. Refer to the Fan Calibration Table inside the line voltage

enclosure. Select the voltage that corresponds to the desired

airflow (cfm or l/s) set point.

5. Adjust the potentiometer on the Fan Card to the desired

voltage.

6. Breaking the power on the 24 VAC will cycle the fan.

Setting the Fan Airflow in the Dynamic Automation (0 – 10 

VDC) Mode
1. Mode Selector Jumper must be in the "0-10V" position.
2. Ensure there is a 24VAC signal at the 24VAC/GND terminals.
3. A "0-10V" VDC input signal will determine the fan airflow at the

unit. Varying this signal will in turn vary the fan airflow. At less

than 0.50 VDC, the unit will turn off.

4. Note: When mode selector jumper is in the "0-10V" position

and the sequence of operation warrants turning the motor off
through the 24 VAC, the "hot" leg of the incoming power must

be broken. Breaking the GND/common leg will not turn the

motor off when the "0-10V" is connected to any controller.

OPTIONAL FSC - FAN STATUS (ON/OFF) CONTACT 

CLOSURE (MOTOR BLOWER PROVING SIGNAL) ON 

H1-2272A1 / H1-2273A1
1. A dry contact closure signal is provided at RLY terminals.
2. This signal can be used by the BAS for proving the motor

blower is running (200 RPM threshold).

ELECTRIC HEAT FAN INTERLOCK RELAY (FIR) (if equipped)
1. Air proving signal is provided to a relay in the heater control

circuit on models equipped with electric heat. This safety

interlock prevents the heater from energizing unless the fan is

energized and rotating at a minimum of 200 RPM.

2. This signal is used in the control scheme in lieu of a mechanical

air pressure switch.

NOTICE:
POWER MUST BE REMOVED FROM THE CONTROLLER 

WHENEVER CONNECTIONS OR DISCONNECTIONS ARE 

BEING MADE. FAILURE TO DO SO COULD RESULT IN 

IRREPARABLE DAMAGE.
BEFORE PROCEEDING WITH ANY ADDITIONAL 

TROUBLESHOOTING, ENSURE THAT THE POLARITY 

OF THE 24 VAC SUPPLY TO THE CONTROLLER IS 

CORRECT. (SEE FIGURE 1). IF THE POLARITY IS NOT 

CORRECT, REMOVE THE CONNECTORS AND RECONNECT 

OBSERVING PROPER POLARITY. RECHECK THE SYSTEM 

FOR PROPER OPERATION.
1. With power off, inspect the unit to make sure that there are no

foreign objects blocking fan operation. Turn the blower wheel

by hand to verify that it moves freely.

2. Energize the unit at the disconnect switch. Adjust the controls

to call for the fan motor to run.

3. Then, turn the unit power back on and wait up to 20 seconds

for the motor to start.

TROUBLESHOOTING IN MANUAL ADJUST MODE
1. Confirm the jumper on the Fan Card is in the "MAN" position

for adjustment of fan speed at the unit.

2. If the motor does not run, turn off the power to the unit and

verify that the power plug and the control plug are firmly and

correctly attached to the motor.

3. If the motor still does not start, turn off power and unplug both

wiring harnesses from the motor.

4. Energize the unit. Check the AC voltage at the motor power

plug. IMPORTANT: Do not jam the voltmeter leads into the

connectors. This will damage the connectors. Insert the

probes into the plugs until they touch the pins. Do not

penetrate the pins. You should have full line voltage between

the neutral and power lines, or between the two power lines in

case of 208/240 VAC. If this is the case, go to step 5. If there

is not a full line voltage signal at this point, check the voltage

at the incoming power terminal block. If there is not a full line

voltage signal at this point, turn off the power to the unit and

have the electrician verify the power issue.

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