Honeywell SV2 Series User Manual page 64

SV2 Series Safety Shut-off Valves
During or after a VPS test, the VPS Test screen can be accessed, which shows the resulting leakage rates for each valve seat, the
valves cycles and run hours at which each test occurred and the status of the test. This information can also be accessed via
Modbus. Refer to Fig. 30.
Fig. 30: VPS Test Screen.
NOTES:
• The first time VPS is run, V1 test results may be inaccurate until operating pressure has been learned.
• The V2 seat leak test part of the sequence requires a minimum starting pressure to complete the test. If the pressure
is not above the minimum requirement, no leakage level will be reported. However, the VPS contact will be toggled to
indicate a failed test so that the burner control shuts down and a valve fault condition will be indicated. The minimum
starting pressure is based on the Pressure Module model used.
– PRESSMODx1: 5mbar / 2.0 in wc / 0.07 psi
PRESSMODx2: 5mbar / 2.0 in wc / 0.07 psi
–
– PRESSMODx3: 8mbar / 3.2 in wc / 0.12 psi
– PRESSMODx4: 16mbar / 6.4 in wc / 0.23 psi
• In case the SV2 Series valve cannot take reliable pressure readings during the external VPS sequence, the SV2 Series
valve will lockout.
• Very low leakage levels of less than 2 liters/hour (= 33.3 ml/min = 0.07 CFH), which are well below any allowed level,
may result due to transient pressure changes caused by the valve balance diaphragm. Any rates below this level will be
recorded as 0 and not included in trending data.
Field Replacement
Should field replacement of the Pressure Module be necessary, ensure that the correct model is ordered. Refer to
Available Pressure Modules and/or the model information on the Pressure Module installed on the valve.
For the mechanical installation, follow the SV2 Series Valve Pressure Modules installation instruction document, 32-00017,
which is packed with the Pressure Module. For step-by-step programming setup instructions, consult the HMI / PC Tool user
manual, 32-00031.
64
Table 11,
32-00029—02