Weil-McLain SlimFit 2 Series Manual page 92

SlimFit Series 2
®
Annual startup
c. Insert burner into machined pocket on end sec-
tion, 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 carefully 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). Make sure O-ring
is still 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 push tube into
fitting. The fitting will self-tighten on the tube. Test the con-
nection 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 (2) blower wire harnesses.
23. Re-install the piping end section combustion chamber ac-
cess 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. Navigate to Diagnostics/Inputs on the Control display (see
Figure 67, page 73).
2. If the flame signal drops to less than 24 above the Shut-
down values, the Control will attempt to correct by increas-
ing the boiler firing rate to increase flame signal.
3. A lower flame signal may indicate a fouled ignitor or dam-
aged ignitor insulation. If cleaning the ignitor does not
improve, ground wiring is in good condition, and ground
continuity is satisfactory, replace the ignitor.
4. If flame signal still remains low, inspect the vent and air
piping. Then inspect the heat exchanger, following the
procedures given in this manual for removal and reinstal-
lation of the heat exchanger cover plate and other boiler
components. Clean the heat exchanger as described in
this manual if necessary.
Figure 86
Flame signal shutdown values
Model Boost
SlimFit – flame signal
1000
1500
2000
92
commercial condensing gas
(continued)
Shutdown
flame signal
40 16
40 16
40 16
— Boiler Manual
-
fired water boiler
Check flue gas temperature
1. Set the boiler to high fire. Then adjust the control 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 102 to
clean the heat exchanger.
Check blower speeds
1. For installations at altitudes above 5,500 feet, make sure
the control is set up for high altitude in the boiler setup
menu. The Control module automatically adjusts low fire
and ignition rates to compensate for high altitude condi-
tions.
2. For installations below 5,500 feet, DO NOT enable high
altitude.
3. Use the Control display to navigate to Manual test mode (see
Figure 68, page 74).
4. Set the firing rate to Low (low fire).
5. Write down the blower RPM value shown and compare
to the value in the table in Figure 74, page 82. Low fire
rate (and corresponding blower speed) is adjusted in the
boiler setup menu.
6. Set the firing rate to MEDIUM (ignition rate).
7. Write down the blower RPM value. It should be within 200
RPM of the value listed in the table in Figure 74, page 82.
8. Set the firing rate to High (high fire).
9. Write down the blower RPM value. It should be within 200
RPM of the value given in the table in Figure 74, page 82.
10. If any of the values are outside the ranges listed in the
previous steps, contact the factory for technical assistance.
Manual Test Mode for Single and
Multiple Boilers
Single Boiler
1. Navigate to Manual Test Mode screen under DIAGNOSTICS
menu.
2. Generate a call for heat and wait until the burner is lit, if not yet
in operation.
3. Press ENTER and select the desired FORCE RATE. Rate will
be forced to setting for 10 minutes.
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 heating season.
Part number 550-100-561/0224