Munchkin Gas-Fired Hot Water Boiler, Manual, Page: 31 / 80

30
GAS-FIRED BOILER
Boiler Manual
Munchkin VISION 1 system
(zoning with valves)
Space heating mode (w/ submixing)
NOTES:
1. This drawing is meant to show system piping concept only.
Installer is responsible for all equipment & detailing required by local codes.
2. All closely spaced tees shall be within 4 pipe diameter center to center spacing.
3.
A minimum of 6 pipe diameters of straight pipe shall be installed upstream and downstream
of all closely spaced tees.
4. The minimum pipe size for connecting a Super Stor water heater is 1 inch.
5. The minimum pipe size for connecting a Munchkin boiler shall be 1.25 inches and 2 inches for the 399M.
6. All pumps are shown with isolation flanges and integral flow check valves.
The alternative is standard flanges with full port ball valves and a separate flow check valve.
7. The anti-scald mixing valve is recommended if the DHW temperature is set above the factory setting of 119˚F.
8. Install a minimum of 12 diameters of straight pipe upstream of all circulators.
9. A purging valve may be used in lieu of the ball valve / hose bib combination shown.
10.
Adjust differential pressure bypass valve to eliminate any flow velocity noise when zone with highest pressure
drop operates by itself.
11. Adjust 3-way manually-set mixing valve to yield proper supply temperature to lower temperature load.
Drawing 3C
Munchkin boiler
DHW
temperature
sensor
purge
Super Stor
indirect DHW tank
anti-scald
mixing valve
outdoor
temperature
sensor
thermal trap
(w/ drain plug)
purge
high limit safety
air handler
vent
3-way
(manually-set)
mixing valve
low temperature
manifold station
P1
P2
T/P
differential
pressure
bypass
valve
balancing
valve
OFF
make-up water
cold
water
purge