Rinnai E110CN Installation & Servicing Instructions Manual page 20

CP H1
H2
Boiler system flushing
20
Boiler system flushing (Not Boiler heat exchanger)
-
The boiler must be valved off from the system, while the system is flushed.
No system cleaner should ever enter the boiler heat exchanger because of its
caustic nature it could damage the heat exchanger.
1. Close the shutoff valves on both the supply and return connections on the plumbing
kit (V1 and V2).
2. Connect pump outlet hose (H1) to the supply side purge station (BD1).
3. Connect drain hose (H3) to the return side purge station (BD2).
4. Pour the system cleaner into a pail and follow the system cleaner instructions
about circulation time and volume to be added to the system.
5. Operate the charging pump (CP) and charge the system with the required volume
of system cleaner.
6. Close the supply side purge station (BD1) and return side purge station (BD2).
7. Turn on the system pump(s) (SP) and circulate the cleaner through the system
for required time by the cleaner manufacturer.
8. Once the time require by the system cleaner manufacturer has been met place
the drain hose (H3) in a drain.
9. Turn off the system pump(s) (SP).
10. Close the main valve on the system return (V3) and open the return side purge
station (BD2).
11. Open the auto feed on the system (F1) and allow water to rinse the system for
whichever is greater: 10 minutes or the rinse time required by the system cleaner
manufacturer.
V1
Close valve
BD1
SP
V2
Close valve
F1
BD2
H3
fig. 7