Munchkin 399M Installing, Operating & Maintaining page 22

Standard Munchkin boiler
Retrofit piping (zoning with valves)
Domestic water heating mode
make-up water
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 399M: 16 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.
A purging valve may be used in lieu of the ball valve / hose bib combination shown
8.
Fig. 5-4
22
zone valves
P1
T/P
Munchkin boiler
.
V1
anti-scald
mixing valve
Super Stor
indirect DHW tank
PIPING
Drawing 1B
flow
bypass
valve
cold
water