Munchkin Gas-Fired Hot Water Circulating Heater - Manual (Page 8)

7
GAS-FIRED HEATER
Installation Manual
PART 2: HOW THE MUNCHKIN CONTENDER OPERATES
(CONT’D)
powered and combustion air is flowing.
4. Swirl Plate System
The Swirl Plate on the gas valve controls the
air and gas flow into the burner, which will
a s s u r e b e t t e r m i x i n g f o r i m p r o v e d
combustion.
5. Supply water temperature sensor
This sensor monitors heater output water
temperature (system supply). The control
module adjusts the heater firing rate so the
outlet temperature is correct.
6. Return water temperature sensor
This sensor monitors the return water
temperature (system return). The control
module reduces or increases heater input,
depending on how close the return water
t e m p e r a t u r e i s t o t h e o u t l e t w a t e r
temperature.
7. Temperature and pressure gauge
Allows the user to monitor the systems
temperature and pressure.
8. Control
The integrated control system monitors the
return and supply water and regulates the fan
speed to regulate the unit’s BTU output. This
allows the unit to only deliver the amount of
heated energy required and nothing more!
9. Flue pipe adapter
The flue pipe adapter may be positioned so
that the installer is able to find a position that
will best facilitate the exhaust and combustion
air pipe connections with the least number of
elbows even in the most challenging
applications.
10. Burner
Made with metal fiber and stainless steel
construction, the burner uses pre-mixed air
and gas and provides a wide range of firing
rates.
11. 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.)
12. 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
heater and down to a suitable inside drain, if
the condensate outlet on the Munchkin
Contender 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 should
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.
13. 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.
14. The Vision 1 Optional System
The Vision I System will allow the installing
contractor to take the highly efficient
modulating Munchkin Contender 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