Weil-McLain SlimFit 2 Series Manual page 90

SlimFit Series 2
®
Annual startup
Check ignition wiring
1. Check ignition cable electrical resistance. A good cable will
have resistance between 900 and 1000 ohms. Replace if not
acceptable.
2. Inspect boiler ground wire from ignition electrode to ground
terminal strip.
3. Verify all wiring is in good condition and securely attached.
4. Check ground continuity of wiring using continuity meter.
5. Replace ground wires if results are not satisfactory.
Inspect flame sense assembly
1. Remove the flame sensor assembly from the boiler
heat exchanger piping end section. See image at
right. Flame sensor insertion length is shorter than
the ignition electrode (see above) and has a pink
ceramic insulator.
2. Remove any white oxides accumulated on the flame
sense rods using steel wool. If the flame sense rods
cannot be cleaned satisfactorily, replace flame sense
assembly with a new one.
3. Reinstall flame sense assembly, making sure gasket
is in good condition and correctly positioned.
4. Replace gasket if necessary.
5. Inspect the flame sense harness and connections. Replace if
necessary. See WARNING above about flame sensor location.
Check all boiler wiring
1. Inspect all boiler wiring, making sure wires are in good condi-
tion and securely attached.
Check control settings
1. Use the display to navigate through all settings. Adjust set-
tings if necessary.
2. Check settings of external limit controls (if any) and adjust if
necessary.
90
commercial condensing gas
(continued)
— Boiler Manual
-
fired water boiler
Figure 81
Gas valve and venturi
Air flow switch hose
Gas valve M5 bolts
Figure 82
Burner removal and replacement
IMPORTANT — Align the burner flange and
gasket notches with the pins in the casting.
Figure 83
Burner access
Observation
window
NOTE: Ignitor ground wire must be attached
to the ignitor mounting screw.
Plastic reference tube
Air inlet hose bolts
Gasket
Burner
Nuts
Mixing adapter
Part number 550-100-561/0224