Weil-McLain Evergreen EVG 220 Manual page 90

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gas
Startup — final checks
❏
Check system and boiler
1. Check system piping for leaks. If found, shut down boiler and
repair immediately. (See WARNING on page 86 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.
❏
Check vent piping and air piping
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
flue gas spillage and carbon monoxide emissions
which will result in severe personal injury or death.
❏
Check gas piping
Check around the boiler and inside the boiler jacket for gas odor
following the procedure of page 51 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.
❏
Propane boilers — verify conversion
Verify boiler has been converted for propane. See page 12 .
DO NOT attempt to measure
gas valve outlet pressure
DO NOT adjust or attempt to measure gas valve outlet
pressure. The gas valve is factory-set for the correct outlet
pressure. This setting is suitable for natural gas and pro-
pane, requiring no field 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 fire natural gas ONLY.
Failure to comply could result in severe personal injury,
death or substantial property damage.
❏
Check flame & combustion with instruments
1. Initiate a call for heat on one of the thermostat inputs.
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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 firing rate is set to the maximum given
in the table. If not, adjust as necessary. Then navigate to
DIAGNOSTICS — Manual test mode (see page 101 for
proper instructions on testing a multiple boiler system) and
force the firing rate to HIGH (High fire).
4. Look at the flame through the flame inspection window.
The high fire flame should be blue and should be stable. The
burner surface should be covered with orange dots.
– 90 –
-
fired water boiler
— 220/299/300/399 Boiler Manual
(continued)
Insert combustion analyzer probe
5.
temperature sensor from the flue pipe and insert a combus-
tion test probe.
6. Test for CO (or O
2
ply with Figure 88, page 91. If results are acceptable, proceed
IF NOT
to step 7.
Adjustment" on page 91 to set the throttle screw position.
If combustion at either high or low fire is
outside the range given in Figure 88, page 91,
follow the procedure given on page 91 for
adjusting the throttle screw on the gas valve.
If throttle screw adjustment does not correct
the problem, then shut down the boiler and
contact your local Weil-McLain representative.
Throttle screw adjustment must be done only
by a qualified 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 off 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
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
Figure 81, page 81) and force the firing rate to MIN (Low fire).
9. Look at the flame through the flame inspection window. The
low fire flame 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 Figure 81, page 81)) and force the firing rate to AUTO
(normal operation).
12. Reinstall the flue gas temperature sensor. When replacing the
sensor, remove the rubber grommet from the probe. Insert
the rubber grommet into the flue pipe, then insert the probe
into the rubber grommet.
You must reinstall the flue gas temperature sensor
to prevent flue gas spillage into the boiler enclosure.
Failure to comply could result in severe personal
injury, death or substantial property damage.
— Remove the flue
) and for CO. The CO values must com-
2 2
, follow the instructions under "Gas Valve
= Btuh
Part number 550-100-131/0120