Check Flue Gas Temperature; Review With Owner; Check Flame Signal - Weil-McLain SlimFit Manual

SlimFit
™
commercial condensing gas
Annual startup
burner (item 10). This should allow for removal of the metal
dish (item 8) and the refractory disc (item 9). Then rinse the
burner from inside out. Allow to dry completely. Re-attach
the refractory disc and retainer to the burner after cleaning.
14. Re-install the burner:
a. Carefully insert the burner, avoid dragging fiber mesh as its
inserted.
b. Align small dowel pins at the 5 and 7 o'clock positions with
the notches in the burner flange.
c. Insert burner into machined pocket on end section, burner
should tilt down slightly as the end of the burner rests on
opposite end section
d. Place Burner gasket over studs and against burner
15. Carefully slide blower/venturi/mixing adapter onto the M12
studs.
The blower/venturi/mixing adapter assembly is heavy,
weighing up to 60 pounds on larger units. Handle care-
fully to avoid possible personal injury or damage to the
components.
16. Make sure that the burner flange is still resting inside the machined
pocket on the end section.
17. Tighten the M12 flange nuts on the Mixing adapter to 22 Ft-lbs
(30 N-m).
18. Connect gas manifold back to gas valve with the M5 Allen bolts
(4), with torque 53 in-lbs (6 N- m).
in position on the gas valve
19. Reconnect air inlet pipe to venturi, with torque 53 in-lbs (6 N- m).
20. Reconnect plastic reference line to venturi ù push tube into fitting.
The fitting will self-tighten on the tube. Test the connection by
lightly pulling on the plastic tube.
21. Press the air flow switch tube back onto the venturi hose barb.
The air flow switch hose and plastic reference line
MUST be replaced correctly on the venturi.
22. Reconnect the two blower wire harnesses.
23. Re-install the piping end section combustion chamber access
plate assembly. Tighten the M12 flange nuts on the access plate
22 Ft-lbs (30 N-m).
24. Re-install the igniter assembly and flame sensor assembly. Make
sure the gaskets are in good condition.
25. Re-attach the wiring connections to the igniter and flame sensor.
26. Verify there are no gas/air leaks.
27. Reconnect any wiring that was disconnected.
28. Retest the boiler, making sure the flame is acceptable after the
cleaning.

Check flame signal

1. On the Sola display, navigate to HOME PAGE
Then use the upper right or left scroll arrow to toggle to the Flame
Detection screen.
2. The screen will show whether flame has been detected and list
the flame signal value.
3. You can hit the ANALYSIS button to go to the Trend Analysis page
(see page 64 for explanation). Select Flame signal, press START
102
-
fired water boiler
(continued)
Make sure O-ring is still
DETAILS.
— Boiler Manual
TRENDING, and then press VIEW. The graph will show flame
signal value vs time.
4. The flame signal strength will change with firing rate, the value
increasing with firing rate increase. Check the flame signal both
at maximum and minimum firing rate, with the burner running
steady.
a. Force the boiler to low fire using the procedure in Figure 87,
page 90.
b. Use the Sola display to see the flame signal strength using the
procedure described above.
c. The flame signal must be at least 0.8 volts at low fire.
d. Force the boiler to high fire using the procedure in Figure 87,
page 90.
e. Use the Sola display to see the flame signal strength using the
procedure described above.
f. The high fire flame signal should be higher than the low fire
signal, typically 14 volts or more.
5. If the flame signal is lower than it should be, the flame sensor may
be fouled or its ceramic insulator may be damaged.
a. Remove, inspect and clean the flame sensor assembly using
the method in "Inspect flame sense assembly" on page 100.
b. If flame signal remains low after cleaning, replace the flame
sensor assembly.

Check flue gas temperature

1. Set the boiler to high fire. Then adjust the Sola module display to
view flue gas temperature and boiler return temperature.
2. The flue gas temperature should be no more than 30°F higher
than the boiler return temperature.
3. If the flue temperature is higher than this, shut down the boiler,
allow to cool, and follow the procedure starting on page 112 to
clean the heat exchanger.
Check blower speeds
1. If blower speed settings in the Sola have not already been checked,
follow the Startup procedure, page 90, to check (and change if
necessary) the blower speed settings in the Sola control.

Review with owner

1. Review the SlimFit User's Information Manual with the owner.
2. Emphasize the following to the owner:
a. Perform the maintenance schedule specified in the User's
Information Manual.
b. Call a licensed contractor should the boiler or system exhibit
any unusual behavior.
c. Follow the proper shutdown procedure.
d. Schedule an annual startup at the beginning of the next heat-
ing season.
Part number 550-100-116/0713