Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 29)

29
PIPING
Standard Munchkin boiler
Preferred piping (zoning with valves)
Domestic water heating mode
Munchkin boiler
P1
Super Stor
indirect DHW tank
T/P
Drawing 2B
make-up water
V1
zone valves
anti-scald
mixing valve
purging
valves
closely
spaced
tees
differential
pressure
bypass
valve
P2
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.
4. The minimum pipe size for connecting a Munchkin boiler is 1.25 inches.
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.
8. A purging valve may be used in lieu of the ball valve / hose bib combination shown.
9. A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream
of all closely spaced tees.
cold
water
OFF OFF OFF OFF
Fig. 5-6
NOTE: FOR VISION PIPING APPLICATIONS, REFER TO THE VISION INSTALLATION PIPING DIAGRAMS.