Honeywell SV2 Series User Manual page 178

SV2 Series Safety Shut-off Valves
Fault Fault
Category Description
FARMOD flow
sensor (S2a) out
of range
FARMOD
control valve
has reached its
lower limit
Fuel/Air
Detailed Description
The S2a airflow sensor signal
is/was outside the sensor
measuring range (-8000 to
8000).
The stepper motor position
has reached zero position
during run mode. This can
happen if the inlet pressure
is relatively high for the
requested minimum gas
volume.
Lower the gas inlet pressure
to SV2 Series valve or
increase minimum capacity.
Practically, the stepper motor
position should be above
80 steps for the 1.5in and
2in valves and above 50
steps for the 1in valve. Below
these values the gas flow
will change very little with
changing motor position.
Remediation Steps
1.) Reset valve and burner management
system.
2.) If fault persists, replace Fuel/Air
Module
3.) Reset valve and burner management
system.
4.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface.
5.).Recommission partially or fully as
desired.
Fault indicates gas supply pressure is too
high and minimum load is too low.
1.) Check gas supply pressure to
appliance.
2.) Check Fuel/Air Module signal
connections for proper engagement.
3.) Reset valve and burner management
system, monitoring for proper operation.
4.) If fault persists, replace Fuel/Air
Module.
5.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface.
6.) Recommission partially or fully as
desired.
7.) Reset valve and burner management
system, monitoring for proper operation.
8.) If fault persists, replace valve and re-
commission.
178
Comments Fault
#
28
30
32-00029—02