Honeywell SV2 Series User Manual page 73

6%
5%
4%
3%
2%
1%
0%
0.3 0.35
-1%
-2%
-3%
-4%
-5%
-6%
Fig. 33: FARMODx4-000 Typical Premix Amplification Factor Accuracy.
ACCURACY INLCLUDES:
- Sensor drift / offset and gain shift
1
- Ambient temperature (-15°C to +63°C / +5°F to +145°F).
- Typical 95% of the population.
1. ±3 counts.
2. ±1.5% of actual sensor reading
Fuel/Air Module Introduction
The Fuel/Air Module is installed on SV2 Series premix valves for fuel/air regulation (valve model numbers starting with V2V).
Each FARMOD contains multiple sensors for accurate measurement of the differential air and gas pressures. Dedicated control
electronics and software accurately regulate the fuel/air ratio based on the Fuel/Air Module signals.
Dedicated Fuel/Air Modules are available to meet the specific requirements of Premix. Refer to
factory, each valve will come with the appropriate tested, calibrated and mounted FARMOD.
Note that factory stepper motor full stroke calibration is stored in the main electronics board and the FARMOD. At each
shutdown, the valve will check the actual full stroke against the stored value. If the stored value is bad or out of tolerance, the
value cannot be used and the valve will lockout.
Field Replacement of FARMOD or Valve Main Electronics
Applies to valve firmware version 12.01 or later. HMI/PC Tool software version 12.01.002 or later.
FARMOD Field Replacement
Should field replacement of the Fuel/Air Module be necessary, ensure that the correct model is ordered. Refer to
or the model information on the FARMOD installed on the valve. For the mechanical/electrical installation, follow the SV2 Series
Valve Fuel Air Ratio Modules installation instruction document, 32-00040, which is packed with the Fuel/Air Module. For step-
by-step FARMOD change-out instructions, refer to
SV2 Series Safety Shut-off Valves
V2F, V2V
0.4 0.45 0.5 0.55
Amplification factor
after commissioning.
2
CHAPTER 8
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
0.6 0.65 0.7
of this manual.
73
0.75 0.8 0.85
Table 16 for details. From the
Table 16 and/