Installation and Operation Manual

Figure 96: Piping Diagram
HOT
COLD
ON!
Cold Drain

Cold Isolation


Hot Isolation

Hot Drain

Condensate

Condensate
HOT
PRV
COLD
86 Rinnai Tankless Water Heater Installation and Operation Manual
6.4 Draining the Water
Heater


󰀨
WARNING
Figure 95




To manually drain the water:
 󰀨
 󰀨
 
 
 
 
 

 

To resume normal operation:
 󰀨

 
 
 
 

 
 
󰀨
 
Running a low volume of water through the
water heater to prevent freezing:






 󰀨

 



When the water heater or external piping has
frozen:
 

 󰀨

 

 
