Munchkin HIGH EFFICIENCY HEATER with the "925" Controller - Manual (Page 26)

26
PIPING
Standard Munchkin boiler
Retrofit piping (zoning with valves)
Space heating mode
Munchkin boiler
P1
Super Stor
indirect DHW tank
T/P
Drawing 1A
make-up water
zone valves
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 flow bypass valve for the following minimum boiler flow rates in any operating mode:
Munchkin model T50M: 3 gpm
Munchkin model T80M: 3 gpm
Munchkin model 80M: 3 gpm
Munchkin model 140M: 5 gpm
Munchkin model 199M: 7 gpm
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 .
V1
flow
bypass
valve
anti-scald
mixing valve
cold
water
OFF
Fig. 5-3
NOTE: FOR VISION PIPING APPLICATIONS, REFER TO THE VISION INSTALLATION PIPING DIAGRAMS.