Rinnai E75CN Installation & Servicing Instructions Manual page 68

Flushing
Draining
Flushing and draining
68
6. Place the drain hose (H3) and the hose (H2) to the pump (CP) inlet into the cleaning
solution.
7. Open both service valves (V1 and V2) on the hot water and cold water lines.
8. Operate the pump (CP) and allow the cleaning solution to circulate through the
brazed plate heat exchanger for at least 45 minutes.
9. Turn off the pump (CP).
10. Rinse the cleaning solution from the brazed plate heat exchanger as follows:
a. Remove the free end of the drain hose (H3) from the pail
b. Close service valve, (V2), and open shutoff valve, (V4). Do not open shutoff
valve, (V3).
c. Disconnect both H1 and H3 from the service valves
d. Connect H3 to V1 and place the end of the hose in a drain
e. Allow water to flow through the brazed plate heat exchanger for 5 minutes
f. Close service valve, (V1), and open shutoff valve, (V3).
11. Disconnect all hoses.
Cold water
Sediment filter
Vinegar
Cold water
Sediment filter
Drain
Mixed water
to fixtures
Thermostatic
mixing valve
V4
V3
V2 V1
H3
CP
H1
H2
Mixed water
to fixtures
Thermostatic
mixing valve
V4
V3
V1
V2
H1
P
Low Loss Header
T
System Supply System Return
P
Low Loss Header
T
System Supply System Return
figure 37