Honeywell SV2 Series User Manual page 61

In order to properly program the high and low gas limit settings, the burner must be run so that the embedded pressure sensors
can measure the actual pressure that should occur during low fire and high fire conditions, respectively. While the burner is
running after stabilization has occurred, the user must select a % over or under the measured operating pressure for the high
and low gas limit settings. The value can then be locked in. The high gas pressure limit can be set between 125% and 150% of
the highest measured operating pressure at low fire while the burner is running. Conversely, the low gas pressure limit can be
set between 50% and 75% of the lowest measured operating pressure at high fire. Refer to
user interface setup summary screen.
Fig. 27: Hi-Gas/Low-Gas Limit Setup Summary Screen.
NOTES:
• Default status for both the Hi-Gas and Lo-Gas is Disabled.
• When using the Pressure Module, you MUST use both the Hi-Gas pressure and Lo-Gas pressure settings if the Lockout
Type for either is changed from Disabled.
• The Lockout type selected for each may be different.
• In order for the valve to be operational, the Verification of Safety Parameters operation must be completed if any
intelligent features are setup.
• YOU MUST KEEP THE HI-GAS AND LO-GAS LOCKOUT TYPE IN DISABLED STATUS WHILE PROGRAMMING THE
PRESSURE LIMITS if the wiring between the valve and burner management system is in place. ALSO, YOU MUST KEEP
THE EXTERNAL VPS CONTROL DISABLED, IF USED.
– The burner needs to be run in order to properly measure the pressure at the valve and thus set the Hi-Gas and Lo-Gas
limits accordingly.
– Because the Hi-Gas and Lo-Gas functions are in the burner management interlock string, which is run through the SV2
Series valve, the burner management system will likely lockout due to the interlock string being open if the Hi-Gas and
Lo-Gas Lockout Type are changed from Disabled before proceeding with setup.
– Additionally, when the burner starts, the VPS control may try to perform the VPS test and thus lockout due to the
Pressure Module not being programmed or verified.
After successful setup of both the high and low gas pressure limits, the installer may test both limit trip points via an embedded
testing routine. Refer to Fig. 28
To test the lockout for each setting, the installer must slide the appropriate limit gauge icon to the right or left, approaching the
current operating pressure as shown on the top of the bar. The slider bar color changes to red when the limit reaches the current
setting at which point the valve will lockout, opening the interlock relay contact and illuminating the appropriate LED on the
valve face.
SV2 Series Safety Shut-off Valves
V2F, V2V
for the high/low gas pressure user interface limit test screen.
SV2 SERIES SAFETY SHUT-OFF VALVES USER MANUAL
61
Fig. 27 for the high/low gas pressure