Honeywell SV2 Series User Manual page 179

Fault Fault
Category Description
FARMOD
control valve
has reached its
upper limit
Fuel/Air
FARMOD sensor
- drift of flow
sensors
SV2 Series Safety Shut-off Valves
V2F, V2V
Detailed Description
The Fuel/Air Ratio stepper
motor position has reached
maximum open position
during run mode. This can
happen if the inlet pressure
is relatively low for the
requested maximum gas
volume.
Increase the gas inlet
pressure to SV2 Series
valve or decrease maximum
capacity. Practically, the
stepper motor position
should be below 1100 steps
for the 1.5in and 2in (DN40-
50) valves and below 550
steps for the 1in (DN25)
valve. Above these values
the gas flow will change very
little with changing motor
position.
The safety check on the Fuel/
Air Ratio Module sensor
signals has failed. If this
fault occurs shortly after
commissioning adding
points to the correction
curve of 4 points or
recommissioning the 4
points can help to improve
the performance of the
safety check.
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
Remediation Steps
If this occurs with fault 34 (FARMOD
target (S2b) not reached), it's an indication
the gas supply pressure is too low and the
maximum load is too high.
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 Ratio
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.
1.) Check Fuel/Air Module reference signal
connection for proper engagement.
2.) Reset valve and burner management
system, monitoring for proper operation.
3.) If fault persists, replace Fuel/Air
Module.
4.) Reset valve and burner management
system.
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.
179
Comments Fault
#
Warning 31
indication
for SV2
Series
valve. This
condition
will likely
cause a
burner
controller
lockout.
Warning 32
indication
for SV2
Series
valve. This
condition
will likely
cause a
burner
controller
lockout.