Installation Manual
HOT
COLD
ON!
Cold Drain
Cold Isolation
Hot Isolation
Hot Drain
Condensate
Trap Drain Plug
Condensate
HOT
PRV
COLD
Figure 77: Piping Diagram
Rinnai Tankless Water Heater Installation and Operation Manual 81
6.4 Draining the Water
Heater
WARNING
heater be drained.
To manually drain the water:
1.
2.
3.
4.
5.
6.
7.
To resume normal operation:
1.
2. Insert the condensate trap drain plug.
3.
4.
5.
then close.
6.
7.
8.
Running a low volume of water through the
water heater to prevent freezing:
1.
2.
When the water heater or
external piping has frozen:
1.
2.
3.
4.
leaks.