Munchkin HIGH EFFICIENCY HEATER with the "925" Controller Operating Instructions Manual page 29

Standard Munchkin boiler
Preferred piping (zoning with valves)
Domestic water heating mode
make-up water
closely
spaced
tees
purging
valves
NOTES:
1. This drawing is meant to show system piping concept only.
Installer is responsible for all equipment & detailing required by local codes.
2. Adjust differential pressure bypass valve to eliminate any flow velocity noise when zone with highest pressure
drop operates by itself.
3. The minimum pipe size for connecting a Super Stor water heater is 1 inch.
The minimum pipe size for connecting a Munchkin boiler is 1.25 inches.
4.
5. All pumps are shown with isolation flanges. The alternative is standard flanges with full port ball valves.
6. The anti-scald mixing valve is recommended if the DHW temperature is set above the factory setting of 119˚F.
7. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
A purging valve may be used in lieu of the ball valve / hose bib combination shown.
8.
A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream
9.
of all closely spaced tees.
NOTE: FOR VISION PIPING APPLICATIONS, REFER TO THE VISION INSTALLATION PIPING DIAGRAMS.
Fig. 5-6
zone valves
P2
P1
T/P
Munchkin boiler
V1
anti-scald
mixing valve
Super Stor
indirect DHW tank
PIPING
Drawing 2B
differential
pressure
bypass
valve
cold
water
29