Installation Guide

Rinnai I-Series Condensing Boiler Combi Manual 113
This boiler includes a service indicator/reminder (also called an LC diagnosc code). When selected
in the parameter sengs, an LC code will display on the controller indicang that it is me to ush
and service the boiler. Failure to ush the boiler will cause damage to the plate heat exchanger.
Damage caused by lime build-up is not covered by the boiler’s warranty. Rinnai strongly
recommends installaon of isolaon valves to allow for ushing of the plate heat exchanger.
1. Disconnect electrical power to the boiler.
2. Close the shuto valves on both the hot
water and cold water lines (V3 and V4).
3. Connect pump outlet hose (H1) to the cold
water line at service valve (V2).
4. Connect drain hose (H3) to the hot water
line at service valve (V1).
5. Pour four gallons of undiluted virgin, food
grade, white vinegar into pail.
6. Place the drain hose (H3) and the hose
(H2) to the pump inlet into the cleaning
soluon.
7. Open both service valves (V1 and V2) on
the hot water and cold water lines.
8. Operate the pump and allow the vinegar
to circulate through the boiler for at least
1 hour at a rate of four gallons per minute
(15.1 liters per minute).
9. Turn o the pump.
10. Rinse the vinegar from the boiler as
follows:
a. Remove the free end of the drain hose
(H3) from the pail. Place in sink or
outside to drain.
b. Close service valve (V2) and open
shuto valve (V4). Do not open shuto
valve (V3).
c. Allow water to ow through the boiler
for ve minutes.
d. Close shuto valve (V4). When unit has
nished draining remove the in-line
lter at the cold water inlet and clean
out any residue. Place lter back into
unit and open valve (V4).
e. Close service valve (V1) and open
shuto valve (V3).
11. Disconnect all hoses.
12. Restore electrical power to the boiler.
V1
H3
H2 H1
V4
V2
V3
IMPORTANT
Scale build-up will aect the
performance of the boiler. Water should
be treated. Rinnai oers Southeastern
Filtraon’s “ScaleCuer Water
Condioning System” that oers superior
lime scale prevenon and corrosion
control by feeding a blend of control
compounds into the cold water supply.