Installing a SIM+
Figure 1 SIM connections - SL 10-85 G3, SL 14-115 G3, SL
20-160 G3, SL 30-199 G3 series boilers
1. Disconnect the power to the boiler and close the
gas shut-off valve.
All the module’s connector plugs, except the
ignition lead, have retaining clips.
2. Note the position of the retaining clips for each
plug. The retaining clips must be depressed and
properly released before the connectors can be
unplugged.
3. Unplug all the connectors from the module.
4. Check that the wire connections are still solid and
secure.
5. To remove the existing module, hold it in place as
you unscrew the two mounting screws. Retain the
screws.
6. Position the new module, so that the mounting
holes align.
7. Insert the screws and lightly tighten to secure the
module in place.
8. Plug the connectors into their respective sockets
(see image above), ensuring that the retaining
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clips click into place properly. Each wire
connector plug should fit snugly into a socket.
9. (Optional) To replace the ignitor:
a. Unscrew the two Phillip head screws
holding the ignitor in place.
b. Position the new ignitor and gasket in
place, and attach using the two ignitor
screws supplied with the kit.
10. Leaving the gas off, restore power to the boiler.
If the ignitor was replaced, you should
pressurize the combustion chamber to check
for leaks around the ignitor gasket. The way to
pressurize the combustion chamber is to put
the fan into vent test mode that will drive the
fan into high speed.
11. To perform the leak test:
a. Apply an approved leak solution around
the ignitor gasket.
b. Remove any call for heat.
c. From the touchscreen controller's
Main
Menu
go to
Diagnostics
>
Fan
Operation
>Press the
Vent Test On/Off
button to drive the fan into high speed.
d. When finished, press the
On/Off
again,
and wipe off the excess solution.
12. Leaving the gas off, initiate a call for heat.
13. Look through the sight glass to check that a
spark is present during the ignition trial.
14. If the spark looks bright and stable, turn on the
gas and allow the boiler to go through another
trial for ignition. It should light off smoothly and
quietly.
Replacing the ignitor
1. Disconnect the power to the boiler and close
the gas shut-off valve.
