FloAire Indirect Fired Heater - Manual (Page 24)

24
Troubleshooting Flowcharts
Blower runs
but there is
no heat
Is Outside
temperature higher
than temp selector?
No heat required
YES
Is LED on FSC
energized?
Check wiring to
combination
valve
NO
YES
Is there 24V at
amplifier
terminal #11
Power vent not
functioning, high
limit activation,
or BVSS trip
Is there 24V at
amplifier
terminal #9?
Check wiring
from 24V
transformer
Refer to Maxitrol
Literature
NO
YES
YES
NO
NO
Burner lights but heater
stays in High Fire
Is temperature rise
requirement low?
System
Operating
Properly
With wires 3 & 4 removed
from the Maxitrol Amplifier,
is there 8K to 12K Ohms
between the wires?
If above 12K
Ohms, check
for open
circuit.
Is Plunger in the
Modulating Valve jammed?
Inspect and clean. It
should operate freely in the
sleeve.
Foreign object holding
valve open. Remove
bottom plate and inspect
valve and seat. Clean or
replace valve.
NO
YES
YES
NO
YES
Is Freeze-Stat
open?
Adjust or
Replace
Is end switch on
Motorized
Damper closed?
Adjust or
Replace
actuator
YES
YES
NO
Nothing
Happens
Is Overload
tripped on
starter?
Reset & measure FLA
of motor. Is it higher
than rating?
Adjust
or
change
Pulley
NO
NO
YES
Burner lights but
heater stays in
Low Fire
Is temperature rise
requirement low?
System operating
properly
With wires 3 & 4
removed from the
Maxitrol Amplifier, is
there 8K to 12K
Ohms between the
wires?
If below 8K Ohms,
check for short circuit.
Remove Terminal #3
from the Maxitrol
Amplifier. Does the
heater go into High Fire?
YES
NO
YES
NO
YES Refer to Maxitrol
Amplifier literature
NO
Refer to Maxitrol Valve
Literature