Rinnai E50C User's Information Manual page 12

Replenishing the central heating system
The central heating installation needs to be fi lled with potable (drinking)
water. For topping up the installation you use the fi lling loop according to the
following procedure:
i
NOTICE
1 Switch all functions off (heating, DHW and pump);
2 Briefl y push the 'STEP'-button: P x.x = water pressure in PSI;
3 Slowly open the fi lling loop (Indication on display increases);
4 Fill up slowly to between 16 and 18 PSI;
5 STOP appears on the display;
6 Close the fi lling loop;
7 De-aerate the complete installation , start at the lowest point;
8 Check the water pressure and if necessary top it up;
9 Close the fi lling loop;
10 Activate functions required (heating
11 If A xx appears on the display, wait for 17 minutes;
12 Check the waterpressure and if necessary top it up to 16 to 18 PSI
13 Close the fi lling loop;
14 Press the 'STEP'-button;
15 Be sure that the fi lling loop is closed.
After the automatic de-aeration programm (A xx) is fi nished the boiler will
return to the Good reading or Technical reading.
12
Contact your licensed professional installer if
your installation is not provided with a fi lling
loop.
, DHW and/or pump );