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GAS-FIRED HEATER Installation Manual
can cause internal corrosion in system
components. Leaks in heater or piping must be
repaired at once to prevent make-up water.
WINTERIZING THE MUNCHKIN CONTENDER
To winterize the Munchkin Contender, drain the
entire system, then apply air pressure to the
drain valve and allow air and water to escape
from the purge valve (see piping instructions).
Once you have evacuated all of the water that is
possible, you will then need to pump in the non
toxic propylene glycol food grade NSF® listed
antifreeze (SAFE-T-THERM www.houghton.com
or PARATHERM www.paratherm.com). Try to
calculate the entire volume of the piping system
to insure the entire system will be adequately
protected. Consult the glycol manufacturer for
mixture % recommendations to adequately pro-
tect the system for the local climate of the instal-
lation.
With a pump, fill the system with the non-toxic
propylene glycol food grade NSF® listed
antifreeze, allowing the air and remaining water
to escape from the purge valve. Once the
stream coming out of the purge valve matches
the color of the non toxic propylene glycol food
grade NSF® listed antifreeze, the system should
be adequately filled. It is rcommended at this
point to start any circulation pump and allow the
system to circulate for at least 30 minutes to
completely blend any trapped water that might
be in the system with the NSF® listed solution.
At this point it is suggested that you check the
concentration of NSF® antifreeze to be sure that
protection is adequate. Consult the glycol man-
ufacturer for specific instructions on the con-
centration % as well as the freeze and burst pro-
tection methods.
FREEZE PROTECTION FLUIDS
PART 1: PRODUCT AND SAFETY INFORMATION
(CONT’D
CAUTION
Consider piping and installation when
determining heater location. Any claims for
damage or shortage in shipment must be filed
immediately against the transportation
company by the consignee.
CAUTION
NEVER use automotive or standard glycol
antifreeze, even ethylene glycol made for
hydronic systems. Use only inhibited propylene
glycol solutions, which are specifically
formulated for hydronic systems. Ethylene
glycol is toxic and can attack gaskets and seals
used in hydronic systems.
PART 2: HOW THE MUNCKIN CONTENDER OPERATES
Munchkin Contender Condensing Technology is
an intelligent system that delivers highly efficient
hydronic heating, while maximizing efficiency by
measuring the Data Parameters of your heating
system.
1. Stainless Steel Heat Exchanger
The highly efficient durable Munchkin
Contender Stainless Steel Heat Exchanger is
designed to take the colder return water from
the system and extract the last bit of energy
before it is exhausted. The heat exchanger
design is separated by an internal baffle which
diverts the exhaust gas through the primary
heat exchanger into the secondary heat
exchanger where the colder return water
extracts the last residual heat.
2. Modulating Combustion System
Modulation during the central heating
operation is based on the supply temperature.
The set point used for the control depends
upon the programmed central heating curve.
The slope of the heating curve can be changed
by the installer of the Munchkin Contender in
the sense that both turning points of the curve
can be moved. The control monitors the
system to regulate the output of the burner
during operation to match the system
demand. This increase in efficiency allows for
substantial fuel savings.
3. Gas Valve
The gas valve senses suction from the blower,
allowing gas to flow only if the gas valve is