Burnham 40A - Manual (Page 9)

9
4. Purge air from domestic water system. Allow water
to run so the tank is thoroughly purged of any
debris. Run water long enough so that a minimum
of five (5) volume changes of the tank are
accomplished. Close faucets. Reinstall screens.
5. Check system for leaks. Repair as necessary.
F. Connect water boiler return piping (See Figures 3
thru 6).
(For connection to a steam boiler skip ahead to H on
page 12).
Figure 2: Cold Water Supply Piping
1. Determine where in the boiler and space heating
piping system the Alliance™ connections should be
made by identifying the type of system from Figures
3 thru 6.
2. In all cases, the Alliance™ connection labeled
"BOILER RETURN" should be piped to the boiler
return piping as close to the boiler as possible and
especially after any flow control or check valves in
the space heating return piping. The use of a union
and a shut-off valve is recommended. The use of a
flow control or check valve is required to prevent
back flow through the water heater during
operation of the space heating system.