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TROUBLESHOOTING
• FAPV fan does not operate:
• FAPV fan does not operate:
o
For 115 VAC hot lead connected to M terminal (continuous standalone operation, no controller):
>
check for nominal 115 VAC line voltage from N terminal (neutral) to M terminal (115 VAC).
>
Make sure speed control is not in the OFF position.
>
Make sure the disconnect switch is turned on.
o
For 115 VAC hot lead connected to L1 terminal (for intermittent control by ventilation controller or
programmable thermostat):
>
check for nominal 115 VAC line voltage from N (neutral) to L1 (115 VAC)
>
Make sure speed control is not in the OFF position
>
Make sure the disconnect switch is turned on
>
check for nominal 24 VAC (with voltmeter set to read volts AC) from terminals T1 to T2
when controller or thermostat is calling for ventilation. When the 115 VAC hot lead is
connected to L1, there must be nominally 24 VAC present as measured from T1 to T2, for
the fan to operate.
>
Check for 24 V relay coil resistance (Ohms):
•
•
• Fan runs continuously when intermittent operation by ventilation controller is desired:
• Fan runs continuously when intermittent operation by ventilation controller is desired:
o
Ensure the 115 VAC hot wire is connected to L1, and NOT M.
o
Ensure that no or very little AC voltage is present on T1 and T2 when there is no ventilation call by
the controller. Some controllers may allow suffi cient electronic "bleed voltage" to cause the FAPV
to run when there is no intended call for heat. Use a dry-contact type ventilation controller if
necessary, such as Field Controls models HHSC, HHSC+ or FAVC.
o
Check ventilation controller for proper 24V ventilation output confi guration.
• Fan speed control does not allow motor to slow down:
• Fan speed control does not allow motor to slow down:
o
Adjust minimum fan speed adjustment screw. Access the adjustment screw by inserting a small
Phillips screwdriver through the hole behind the small circle at the 4 o'clock position on the speed
control knob scale (see Figure ??).
•
•
Fan runs but does not blow air:
Fan runs but does not blow air:
o
Check for obstruction of inlet air hood
WARNING: Use care when inspecting and/or cleaning the air intake hood. Wasps, bees, or hornets etc. may
WARNING: Use care when inspecting and/or cleaning the air intake hood. Wasps, bees, or hornets etc. may
sometimes nest inside protected areas such as the external part of the hood.
sometimes nest inside protected areas such as the external part of the hood.
o
Check for foreign objects and fi lter condition in the FAPV fi lter compartment
o
Check operation of backdraft damper in the FAPV outlet collar.
•
•
Fan motor hums but does not run:
Fan motor hums but does not run:
o
Check for obstruction of the fan blade
o
Check motor capacitor for wiring and capacitance using multimeter with capacitance measurement
capability. Capacitor should measure nominal 8 microfarad, 250 VAC.
Shut off power to the HVAC system and ventilation controller, and disconnect wires
from terminals T1 and T2.
With a multimeter set to Ohms (Ω), touch probes to T1 and T2. The reading should
be around 100 to 200 Ohms. If no reading is given:
o
Check wiring from T1 and T2 to 24VAC relay coil terminals.
o
Probe the relay coil terminals. Excessive voltage applied to terminals T1
and T2 can cause failure of the relay coil.
page 17 of 20
P/N 780104900 Rev A 09/20
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