Weil-McLain EVERGREEN PRO EVG-399 User Manual

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Part number 550-100-211/0122

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220 /29 9/3 00 /39 9 

 (continued)



1. Follow the same instructions as LP conversion, except using

the correct Natural gas conversion kit, See Figure8,page12 .

2. If LP 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 “NO”.

3. Turn throttle screw clockwise until it stops, and then turn

counter-clockwise number of turns per Figure19. Figure19

is intended to make rough adjustment to gas valve to allow

the boiler to re. ey are NOT intended to replace proper

adjustment of combustion valves per instructions on page91

of this manual.

4. Adjust the oset regulating screw in a Clockwise direction

the number of turns listed in Figure19, according to the

boiler model/size.

Thedoormustbeinplaceduringopera-

tion.

DO NOT operate the boiler with the

jacket door removed except for inspection and

testing as directed in this manual.

Figure19 Course adjustment settings—Throttle and

offset adjustments to be made prior to rst

ignition, by size.

Boiler

Model

ThrottleTurns

(Counterclockwise Q from

Bottom-out Position)

OffsetTurns

(Clockwise P

Factory LP Position )

EVG 220NG

1-5/8 3/8

EVG 299/300

3-3/4 1/8

EVG 399NG

3 1/8

Figure18 Installer conversion label

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Weil-McLain EVERGREEN PRO EVG-399 Gas Boiler Evergreen High Efficiency Gas Boiler