Install Instructions

Installation & Servicing Instructions Rinnai Q-Series

- Boiler system ﬂ ushing (Not Boiler heat exchanger)

When replacing an existing boiler the heating system should be ﬂ ushed with

the old boiler in place before the new boiler is added to the system. If the old

boiler has already been removed a bypass must be piped in when the new boiler

is installed in order to facilitate the ﬂ ushing of the system.

The boiler must be valved off from the system, while the system is ﬂ ushed. No

system cleaner should ever enter the boiler heat exchanger due to its caustic

nature which 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. Open the bypass valve (V4).

3. Connect pump outlet hose (H1) to the supply side purge station (BD1)

4. Connect drain hose (H3) to the return side purge station (BD2).

5. Pour the system cleaner into a pail and follow the system cleaner instructions on

circulation time and volume to be added to the system.

6. Operate the charging pump (CP) and charge the system with the required volume

of system cleaner

7. Close the supply side purge station (BD1)

8. Turn on the system pump(s) (SP) and circulate the cleaner through the system

for required time as established by the cleaner manufacturer.

9. Once the time required by the system cleaner manufacturer has been met place

the drain hose (H3) in a drain.

10. Turn off the system pump(s) (SP)

11. Close the main valve on the system return (V3) and open the return side purge

station (BD2).

12. Open the auto feed on the system (F1) and allow water to rinse the system for

whichever is greater; 10 minutes or the required rinse time by the system cleaner

manufacturer.

Boiler system ﬂ ushing ﬁ gure 9

BD1

BD2

Low Loss Header

Drain

System cleaner