Weil-McLain Evergreen EVG 220 Manual page 16

®
gas
Gas conversions
Table 2:
Low-fire blower speeds—Minimum blower speed
settings according to altitude settings.
Altitude
Lowest Rate for Altitude
Setting
220
(ft.)
0-2000 10%
2500 11%
3000 12%
3500 12%
4000 12%
4500 13%
5000 13%
5500 13%
6000 14%
6500 14%
7000 14%
7500 15%
8000 15%
8500 15%
9000 16%
9500 16%
10000 17%
10500 17%
11000 17%
is set between 96% and 100%. Also verify that the 'Min
Rate" is set to 10% or the minimum rate allowed (if above
2000 ft. elevation). Adjust control settings if not at proper
rate. Verify that boiler is operating at the expected firing
rate at both high- and low-fire during combustion analysis.
Refer to Table 2, page 16 for proper low-fire rate based on
altitude settings.
19. Prior to turning on the boiler, review the procedure and
control sequence for the operation of the Manual Test Mode
in the section of the Boiler Manual titled "Manual Test Mode
for Single and Multiple Boilers" starting on page 101. The
procedure differs between boilers set as a single or multiple-
boiler unit.
The use of a flue gas analyzer is required to convert
this unit and determine proper gas valve settings.
Do not perform this conversion without a flue gas
analyzer. Improper gas valve settings can cause
severe personal injury, death, or property damage.
– 16 –
-
fired water boiler
(continued)
299/300 399
10% 10%
11% 12%
11% 12%
11% 12%
12% 13%
12% 13%
12% 13%
13% 14%
13% 14%
13% 14%
14% 15%
14% 15%
14% 16%
14% 16%
15% 16%
15% 17%
15% 17%
16% 17%
16% 18%
— 220/299/300/399 Boiler Manual
20. Do NOT allow the boiler to modulate freely until the com-
bustion analysis and adjustment is complete. Turn on and
connect properly working, calibrated combustion analyzer to
the boiler flue pipe. Fire the boiler and force it to High Fire in
Manual Test Mode. Adjust the high fire combustion first, us-
ing the throttle adjustment screw, to the CO2 and CO ranges
specified in Figure 89, page 91, by model size. Then, force
the boiler to Low Fire and adjust the offset regulating screw
to the CO2 and CO ranges specified in Figure 89, page 91, by
model size. Reinstall the slotted cap over the offset adjustment
screw. Follow the full startup instructions found in this Boiler
Manual including the section titled "Re-check the Maximum
and Minimum CO2 and CO rate" on page 91.
21. The coarse adjustment prescribed by this manual should
result in combustion settings that allow for ignition and
are a starting point for further adjustment. If, after making
the coarse adjustments prescribed above, the boiler will not
light, turn the throttle screw only counterclockwise (Q) an
additional 1/4 turn and attempt to light again. Repeat for a
total of up to one full turn. If, after following the procedure
above, the boiler still will not ignite or, during combustion
analysis, the analyzer reads less than 1.0% O2, contact Weil-
McLain Technical Services for assistance.
22. Check for gas leaks and confirming proper performance.
Perform Boiler Manual start-up
Perform complete start-up sequence (beginning on page 86),
including check for gas leaks and checking for proper operation.
After placing the boiler in operation, the ignition system safety
shutoff device must be tested, page 91.
Install front door
Install front door after servicing. The front door
must be securely fastened to the boiler frame to
prevent boiler from drawing air from inside the
boiler room. This is particularly important if
the boiler is located in the same room as other
appliances. Failure to keep the door securely fastened
could result in severe personal injury or death.
Apply installer conversion label
After installation is complete and boiler is set up for propane
1.
gas, fill out and attach the propane conversion label next to
the boiler rating label (left side of cabinet).
2. Contractor/installer is responsible for completing the in-
formation required on label (provided in kit) and attaching
installer conversion label next to the boiler rating label.
Part number 550-100-131/0120