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svf
series
500/600
Check Flame and Combustion, continued
Low Fire Check:
10 In Manual Test Mode, and with FORCE RATE
highlighted, select <EDIT> Using the up and
down arrows, select <LOW> and press <SAVE>
Refer to Figure 62, page 85
11 Look at the flame through the flame inspection
window. The low fire flame should be stable, with
a uniform orange color, and evenly distributed
over the burner surface
12 Repeat the combustion test as instructed in the
previous steps
13 Set the FORCE RATE back to <AUTO> and
press <SAVE> before exiting the Manual Test
Mode screen
a The control will automatically reset the force
rate to AUTO mode 30 minutes after last button
press
14 Reinstall the vent flue cap and ensure it is sealed.
WARNING
!
The vent flue cap must be installed to prevent
flue gas spillage into the boiler enclosure. Failure
to comply can result in severe personal injury,
death, or substantial property damage.
Gas Valve Adjustment
IMPORTANT
Adjust the throttle or offset screw only as needed
to meet the combustion values given in Table 16,
page 96. Do not attempt to adjust the throttle screw
at low fire. Confirmation of the correct low fire RPM
must be made before adjusting the offset regulating
screw.
CAUTION
!
Adjust the throttle and offset screws in small
increments.
WARNING
!
DO NOT attempt to adjust the throttle or offset
screws unless done by a qualified technician with
calibrated combustion test instruments. Failure
to comply can result in severe personal injury,
death, or substantial property damage.
550-100-273/0523
boiler manual
1
Figure 71 Throttle and offset regulating screws
Offset Adjustment
Offset Adjustment
220036
1
Throttle screw adjustment is only necessary
if specified elsewhere in this manual, or if
combustion tests indicate the need See Check
Flame and Combustion on page 96 for testing
2
Boiler behavior could indicate a need to check
combustion values at high fire, such as:
• Difficulty igniting
• Poor flame stability at low fire
• Combustion noise
• High carbon monoxide values
3
Combustion readings must be taken at both high
fire and low fire. See Figure 71 for screw locations.
4
If gas valve adjustment does not correct the issue,
shut down the boiler and contact your local WM
Technologies representative
5
For a coarse throttle adjustment on the gas valve,
carefully tighten the throttle screw until it bottoms
out
a For natural gas boilers, back the throttle screw out
2 and 1/4 turns after tightening
b For propane boilers, back the throttle screw out
1 and 3/4 turns after tightening
6
Navigate to the Diagnostics menu to start
adjustments
operaTion
V2
V2
V1
V1
Throttle Adjustment
Throttle Adjustment
(remove blue cap to expose)
(remove blue cap to expose)
1
2
3
4
5
6
7
8
97
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