Weil-McLain Evergreen EVG 220 Manual page 15

®
gas
Gas conversions
Inspect the gas pipe fitting connections on the gas
valve and new venturi (Item 3, Figure 14, page 14).
Check the seal of the connections. Failure to
comply will cause a gas leak, resulting in severe
personal injury or death.
Do not check for gas leaks with an open flame —
use bubble test. Failure to use bubble test or check
for gas leaks can cause severe personal injury,
death or substantial property damage.
13. Prior to the boiler's first ignition, adjust the throttle adjust-
ment screw by first turning the screw clockwise (
bottoms out – do not apply any additional or excess torque.
Adjust the throttle screw in a counterclockwise (
tion with precisely the number of turns listed in Table 1,
according to the boiler model/size.
Table 1:
Course adjustment settings—Throttle and offset
adjustments to be made prior to first ignition, by
size.
Boiler
Throttle Turns
Model
(Counterclockwise
Bottom-out Position)
EVG 220 LP
3/4
EVG
1-3/8
299/300 LP
EVG 399 LP
1-5/8
14. After the throttle has been adjusted coarsely, the offset regu-
lating screw must be adjusted. Remove the sealed, slotted cap
protecting the white offset regulating screw before making
adjustments. It is critical to be precise for the adjustment of
Figure 15
Gas valve adjustment locations—ONLY for use
by a qualified technician, using properly working,
calibrated combustion test instruments.
Throttle adjustment screw
• Turn counter-clockwise
Q
to increase CO .
2
• Turn clockwise to
P
decrease CO .
2
Gas Inlet Pressure
Test Port
Part number 550-100-131/0120
-
fired water boiler
(continued)
P
) until it
Q
) direc-
Offset Turns
Q
from (Counterclockwise
Factory NG Position )
1/4
1/4
1/4
Offset Regulating screw
• Turn clockwise
P
to increase CO .
2
• Turn counter-clockwise to
Q
decrease CO .
2
Note: Must remove cover.
— 220/299/300/399 Boiler Manual
the offset regulating screw. DO NOT attempt to bottom out
the offset regulating screw as was done for the throttle adjust-
ment. Adjustments to the offset regulating screw should be
made from the factory-provided natural gas position.
Adjust the offset regulating screw using the following
steps, referencing Figure 16
1a. Use a marker to mark the corner of one tip of the cross on
the offset regulating screw and the corresponding location
on the outside of the screw housing, as shown in Figure16a.
2b. Turn the offset regulating screw 1/4 turn counterclockwise
Q
( ), ensuring that the tip of next the cross aligns with
the mark on the outside of the screw housing, as shown
in Figure 16b.
Figure 16
Offset regulating screw adjustment—(a)
Marking factory-provided NG position. (b) View
after 1/4 turn CCW adjustment.
Q
a)
15. Reconnect wire harness to gas valve.
16. Restore electrical power, turn on gas by opening manual gas
valve and check for leaks.
17. When boiler has not been fired, follow instructions on the
initial screens to select propane as the gas type. If natural
gas was already selected in the boiler control, the gas type
parameter will need to be adjusted. In the contractor menu,
under the Boiler Settings menu, adjust the "LP Gas" setting
to "YES", see Figure 75, page 76.
18. Before firing, verify that the Boiler Settings are for LP gas,
"Max Rate" for the input (priority) used to fire the boiler
Figure 17 Evergreen
:
b)
®
fuel type setting screen
– 15 –