Honeywell SV2 Series User Manual page 181

Fault Fault
Category Description
Fuel/Air FARMOD rough
target (S2b) not
reached
SV2 Series Safety Shut-off Valves
V2F, V2V
Detailed Description
The Fuel/Air Ratio controlled
gas pressure was not within
the control setpoint rough
window within the specified
time of 10 seconds. Lower
the modulation speed of the
appliance/burner to avoid
this fault.
This fault can occur
independently or in
combination with fault 70.
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
Remediation Steps
If this fault occurs with fault 70 (FARMOD
rough target (S2a) not reached), it is an
indication the modulation speed 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.) Check/lower appliance/burner
modulation speed (by decreasing fan
control P factor or limiting its RPM change
per time unit)
5.) If fault persists, replace Fuel/Air
Module.
6.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface.
7.) Recommission partially or fully as
desired.
8.) Reset valve and burner management
system, monitoring for proper operation.
9.) If fault persists, replace valve and re-
commission.
181
Comments Fault
#
35