Rinnai Q85SN Instructions D'installation Et D'entretien page 21

i
NOTICE
i
NOTICE
BD1
H1
CP
H2
System cleaner
Boiler system flushing
Thoroughly flush all pipes and radiators. We recommend the use of a Rinnai
approved system cleaner. Please refer to the list of approved Rinnai system
cleaners in this chapter.
- Refer to the installation template and chapter 5.3 for the pipe connection dimensions.
The plumbing kit is not intended to support the weight of the piping. Appropriate
piping supports should be used to support all attached piping to the boiler and
plumbing kit.
- Boiler system flushing (Not Boiler heat exchanger)
When replacing an existing boiler the heating system should be flushed 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 flushing of the system.
The boiler must be valved off from the system, while the system is flushed. 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)
P
Low Loss Header
T
SP
V1
V2
V4
V3
BD2
F1
Drain
H3
figure 9
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