Fan And Gas Valve Removal Instructions; Fan And Gas Valve Re-Assembly Instructions - IBC SL 14-115 G3 Installation And Operating Instructions Manual

DANGER
When replacing the fan, the ven-
turi must be moved from the old
fan to the new fan.
Failure to relocate these parts
to the new fan may cause
an immediately hazardous
situation, which must be
avoided in order to prevent
serious injury or death
MAINTENANCE
SL 14-115 G3, SL 20-160 G3, SL 30-199 G3 MODULATING GAS BOILERS SL 20-115 G2 MODULATING GAS BOILER

4.2.1 Fan and gas valve removal instructions

1. Turn off the power and the gas supply to the boiler.
2. Remove the front cover, and allow the boiler to cool down.
3. Disconnect the electrical plug attached to the fan.
4. Undo the union nut at the gas valve outlet (see Figures 45 and 46). Carefully remove
the orifice and O-ring, and keep them in a safe place for re-installation later. Ensure
you protect the gas valve outlet from dust and debris.
5. Remove the two hex nuts connecting the fan to the fan coupler, and carefully remove
the fan. You will find a gasket attached to the fan.
6. If the removed fan is to be re-installed, ensure the fan and venturi are clean and dust
free.
7. Remove the electrical connection from the gas valve.
8. To remove the gas valve, undo the union nut on the inlet of the gas valve.
9. Retain the gasket.
10. To install the new gas valve, with the gasket in position, tighten the union nut to the
inlet of the gas valve.

4.2.2 Fan and gas valve re-assembly instructions

1. Place the fan gasket on the outlet of the fan coupler.
2. Attach the fan to the burner housing, and install the two hex nuts. Tighten the two hex
nuts with a wrench.
3. Insert the orifice and O-ring between the gas valve outlet and the gas line to the fan.
Tighten the gas valve union nut with a wrench. Ensure the gas valve inlet (lower) nut
is tight.
4. Connect the electrical plug to the fan.
5. Restore the gas supply to the boiler, and test the gas valve inlet for gas leaks.
6. Restore power to the boiler and create a call for heat or hot water.
7. Check for leaks at the gas valve outlet and the connection between the fan and the
burner housing.
8. Install the cover to the boiler.
9. Reset the boiler to normal operation.
Figure 46: Gas Valve and Fan components - SL 14-115 G3, SL 20-160 G3, SL 30-199 G3
4-5