Honeywell SV2 Series User Manual page 180

SV2 Series Safety Shut-off Valves
Fault Fault
Category Description
FARMOD
mismatch
FARMOD
target (S2b) not
reached
Fuel/Air
Detailed Description
The Fuel/Air Ratio Module
has been replaced by a
used Fuel/Air Ratio Module
that already contains
commissioning data.
NOTE: If this FARMOD is
Accepted and used, any
existing data in it will be
over-written with the Base
Curve and stepper motor full
stroke data from valve. The
Correction Curve and Ign. Air
Level will be erased and must
be re-commissioned.
The Fuel/Air Ratio controlled
gas pressure was not within
the control setpoint window
within the specified time
of 30 seconds. Lower the
modulation speed of the
appliance/burner to avoid
this fault.
This fault can occur
independently or in
combination with fault 38.
Remediation Steps
1.) Accept new Fuel/Air Ratio Module on
the FARMOD tab in the Setup & Tests
menu of user interface. Any data in the
attached FARMOD will be over-written by
data from the valve main electronics.
2.) Recommission partially or fully as
desired.
If this occurs with fault 38 (FARMOD
target (S2a) not reached), it is an
indication the gas supply pressure 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.) 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 Ratio
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.
8.) If fault persists, replace valve and re-
commission.
180
Comments Fault
#
33
34
32-00029—02