LP-719 Rev. 000 Rel. 000 Date 6.25.20
84
Figure 88 - Remove the Heat Exchanger
Replacing the Gas Valve
1. First remove the gas pipe as described in
Cleaning the Heat
Exchanger Combustion Chamber.
2. Remove the electrical connection from the gas valve.
3. Remove the two nuts above and below the gas valve. See
Figure 89.
Figure 89 - Remove the Gas Valve
E. After Maintenance is Complete
Functional Test
After maintenance is complete, ensure the CH circuit is filled and
purged with a pressure of 12 psi. Ensure the DHW circuit is filled and
purged.
1. Power the boiler on.
2. If necessary, purge air again from the CH and DHW circuits.
3. Check the boiler and system settings and components. Ensure
all adjustments are working properly.
4. Ensure the exhaust pipe is connected properly.
5. Reinstall the boiler front cover.
6. If necessary, set the maintenance interval.
Inform the User
1. Inform the user of any changes / adjustments / replacements
in the system.
2. Ensure the user understands how the system works.
3. Hand the instructions to the user. Ensure the instructions will
be kept close to the unit.
4. Have the user perform these regular tasks:
•
Check the system water pressure regularly.
•
If necessary, restore pressure and vent the system.
•
Set the setpoints and control systems to ensure correct and
economical control of the system.
•
Have the system serviced in accordance with regulations at
regular intervals.
•
NEVER attempt to service the boiler or adjust the combustion
system.
7. Ensure there are no gas leaks.
Replace the Main PCB
1. Fold down the electronics box.
2. Unlock the two clips and open the electronics box cover.
3. Disconnect the electrical connections.
4. Unhook the controller board and remove it.
DANGER
!
Failure to replace the sealing rings will result in gas leaks, and
could cause an explosion or fire, substantial property damage, se-
vere personal injury, or death.
Figure 90 - Disconnect the Main PCB
5. Proceed in reverse order to install the new PCB.
6. Follow the instructions provided with the replacement PCB kit
for setting all necessary parameters.
4. Remove the gas valve.
5. Reinstall the new gas valve in reverse order.
6. BE SURE TO USE NEW SEALING RINGS.
8. Remove the six (6) fixing screws from the heat exchanger. If
accessing the screws on the left part of the heat exchanger is
difficult remove the lateral panel.
9. Proceed in the reverse order to install the new heat exchanger.