Operation
Algas-SDI Operation and Maintenance Manual - VH100-VH200
3-3
On-ratio Gas Systems (Air Flow)
Adjust air valve to low fire.
Use a small flathead screwdriver to open pressure taps A
and B.
Connect manometer to taps A and B.
Adjust air valve until differential pressure is approximately
0.2” WC.
On-ratio Gas Systems (Gas Flow)
Turn the gas flow limiting valve to 50% open.
Open gas shut-off valve.
Start the ignition sequence.
Visually check for flame to confirm burner has lit.
Turn air valve to high fire position.
Confirm air differential pressure is still at the set point and
adjust accordingly.
Use a small flat head screwdriver to open pressure taps
C and D.
Attach manometer to taps C and D.
Adjust gas valve until differential pressure is at required
value stated in Velocity Heat specification sheet.
Remove manometer and close pressure taps C and D.
CAUTION:
Do not exceed the pressure rating of the ratio regulator.
Turn air valve to low fire position.
Adjust the ratio regulator until lowest fire is achieved
while still maintaining flame signal.
Run the burner through another low fire to high fire to low
fire cycle.
Confirm the differential pressure and low fire setting has
not changed.
