Honeywell SV2 Series User Manual page 184

SV2 Series Safety Shut-off Valves
Fault Fault
Category Description
Fuel/Air FARMOD light-
off S2a/S1 ratio
Detailed Description
The Fuel/Air Ratio Module
S2a/S1 ratio was outside the
commissioned window.
This can potentially be
caused by a change in
ignition load or ignition fan
speed.
Remediation Steps
When combined with fault 42 and/or 44
it's an indication the fan speed is wrong or
there are flue system issues.
1.) Check that air duct is clear free of any
foreign bodies and pollution.
2.) Check that blower is running at a
proper rate.
3.) Check Fuel/Air Module signal
connections for proper engagement.
4.) Reset valve and burner management
system.
5.) If fault persists, recommission light off
sequence. Record new pre-ignition air
proving values by checking the Record
Ign. Air Level box on the Ignition Setup
page once system is stabilized.
6.) Check combustion by measuring O2
and CO2 levels.
7.) If fault persists, replace Fuel/Air
Module.
8.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface.
9.).Recommission partially or fully as
desired.
If fault appears independently, the likely
cause is a corrupt S2a sensor inside the
FARMOD.
1.) Reset valve and burner management
system.
2.) If fault persists, replace Fuel/Air Ratio
Module.
3.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface.
4.).Recommission partially or fully as
desired.
184
Comments Fault
#
43
32-00029—02