Munchkin Gas-Fired Hot Water Boiler, Manual, Page: 8 / 80

7
GAS-FIRED BOILER
Boiler Manual
PART 2: HOW BOILER OPERATES
(CONT’D)
9. Electrical field connections with terminal
strips
The electrical cover plate allows access the
line voltage terminal strip and the low voltage
terminal strip. Attach line voltage conduits to
the three holes at the right of the line voltage
terminal strip for power, CH pump and DHW
pump. Route low voltage wires through the
opening to the left of the low voltage terminal
strip. (See Field Wiring Instructions Part 9.)
10. Condensate drain connection
This is a condensing high efficiency appliance,
therefore this unit has a condensate removal
system. Condensate is nothing more than
water vapor, derived from the combustion
products, similar to an automobile when it is
initially started. It is very important that the
condensate line is sloped away from the boiler
and down to a suitable inside drain, if the
condensate outlet on the Munchkin is lower
than the drain, you must use a condensate
removal pump (kit p/n 554200 available from
Heat Transfer Products, Inc.) A condensate
filter, if required by local authorities can be
made up of lime crystals, marble or phosphate
chips and will neutralize the condensate. This
can be done in the field by the installer or you
may purchase one from Heat Transfer
Products, Inc. (P/N N1100). It is also very
important that the condensate line is not
exposed to freezing temperatures or any other
type of blockage. Plastic tubing must be the
only material used for the condensate line.
Steel, brass, copper or others will be subject
to corrosion or deterioration. A second vent
may be necessary to prevent condensate line
vacuum lock if a long horizontal run is used.
Also, an increase in pipe size may be
necessary to drain properly. Support of the
condensation line may be necessary to avoid
blockage of the condensate flow.
11. Spark ignition
The burner flame is ignited by applying a high
voltage to the system spark electrode. This
causes a spark from electrode to ground.
12. The Vision 1 System
The Vision I System will allow the installing
contractor to take the highly efficient
modulating Munchkin and make it even more
efficient by controlling the temperature
delivered to the central heating circuits based
on the outside temperature. The Vision I
system is also a two temperature system, one
temperature for central heating and the other
temperature to the Super Stor Ultra Indirect
water heater. This allows the user to increase
the temperature supplied to the Super Stor
Ultra indirect water heater to get a fast
recovery by prioritizing the flow at a higher
temperature than may be needed for the
central heating circuits (this will require two
separate circulators). You must follow the
piping, wiring and programming instructions
located in the Vision One section of this
manual. The Vision 1 kit consists of the
following, which is included with your
equipment
• Outdoor sensor – 7250P-319
• Indirect tank sensor – 7250P-325