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Checksystemandboiler
1. Check system piping for leaks. If found, shut down boiler and
repair immediately. (See WARNING on page86 regarding
failure to repair leaks.)
2. Vent any remaining air from system using manual vents. Air
in the system will interfere with circulation and cause heat
distribution problems and noise.
Checkventpipingandairpiping
Check for gas-tight seal at every connection and seam of air pip-
ing and vent piping.
Venting system must be sealed gas-tight to prevent
ue gas spillage and carbon monoxide emissions
which will result in severe personal injury or death.
Checkgaspiping
Check around the boiler and inside the boiler jacket for gas odor
following the procedure of page51 of this manual.
If you discover evidence of any gas leak, shut down
the boiler at once. Find the leak source with bubble
test and repair immediately. Do not start boiler
again until corrected. Failure to comply could re-
sult in severe personal injury, death or substantial
property damage.
Propaneboilers—verifyconversion
Verify boiler has been converted for propane. See page12 .
DO NOT adjust or attempt to measure gas valve outlet
pressure. e gas valve is factory-set for the correct outlet
pressure. is setting is suitable for natural gas and pro-
pane, requiring no eld adjustment.
Attempting to alter or measure the gas valve outlet pressure
could result in damage to the valve, causing potential severe
personal injury, death or substantial property damage.
Evergreen
®
boilers are shipped ready to re natural gas ONLY.
Failure to comply could result in severe personal injury,
death or substantial property damage.
Checkame&combustionwithinstruments
1. Initiate a call for heat on one of the thermostat inputs.
2. Access the Evergreen
®
Control contractor menus by pressing
and holding the UP and DOWN arrow keys for seven seconds.
3. Make sure the Max ring rate is set to the maximum given
in the table. If not, adjust as necessary. en navigate to
DIAGNOSTICS — Manual test mode (see page101 for proper
instructions on testing a multiple boiler system) and force the
ring rate to HIGH (High re).
4. Look at the ame through the ame inspection window.
e high re ame should be blue and should be stable. e
burner surface should be covered with orange dots.
5. Insert combustion analyzer probe — Remove the ue
temperature sensor from the ue pipe and insert a combus-
tion test probe.
6. Test for CO
2
(or O
2
) and for CO. e CO
2
values must comply
with Figure88, page91. If results are acceptable, proceed
to step7. IFNOT, follow the instructions under “Gas Valve
Adjustment” on page91 to set the throttle screw position.
If combustion at either high or low re is
outside the range given in Figure88,page91,
follow the procedure given on page91 for
adjusting the throttle screw on the gas valve. If
throttle screw adjustment does not correct the
problem, then shut down the boiler and con-
tact your local Weil-McLain representative.
rottle screw adjustment must be done only
by a qualied technician, using calibrated test
instruments. Failure to comply could result in
severe personal injury, death or substantial
property damage.
7. Measure natural gas input:
a. Operate boiler 10 minutes. Turn o other appliances.
b. At natural gas meter, measure time (in seconds) required
to use one cubic foot of gas.
c. Calculate gas input:
3600 x 1000
= Btuh
number of seconds from step b
d. Btuh calculated should approximate input rating on boiler
rating label.
8. Use the control display to navigate to Manual test mode (see
Figure81,page81) and force the ring rate to MIN (Low re).
9. Look at the ame through the ame inspection window. e
low re ame should be stable and evenly distributed over
burner surface with a uniform orange color.
10. Repeat the combustion test as instructed in the previous steps.
11. Use the control display to navigate to Manual test mode
(see Figure81,page81)) and force the ring rate to AUTO
(normal operation).
12. Reinstall the ue gas temperature sensor. When replacing the
sensor, remove the rubber grommet from the probe. Insert
the rubber grommet into the ue pipe, then insert the probe
into the rubber grommet.
You must reinstall the ue gas temperature sensor
to prevent ue gas spillage into the boiler enclosure.
Failure to comply could result in severe personal
injury, death or substantial property damage.
Part number 550-100-211/0122
– 90 –
(continued)
220 /29 9/3 00 /39 9
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