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RECEIVING:
Before the contractor accepts the MZ, care should be taken to
verify that it has suffered no shipping damage. MPI cannot cover
shipping damage. Trucking companies refuse to cover hidden
damage if the damage is not claimed immediately.
The MZ is externally protected by foam inserts, a plastic bag
and cardboard corner braces. Between the foam protector for
the top of the MZ and the carton is a steel mounting rail that is
formed to match the mounting rail on the back of the MZ.
OPENING THE MZ:
The front cover of the MZ is sealed against the back with a
rubber gasket. With the cover on, the interior of the MZ becomes
a plenum. The cover is held at the top by a mounting lip from
which it hangs. The bottom of the cover is fitted with two clips
that snap closed around the bottom of the back. These clips are
secured with two screws that hold the clips in place. Remove
the screws so the cover can be removed. Replace them when
the installation is complete.
STORAGE:
If the MZ will not be installed right away it should be inspected
and then stored in a secure, dry location.
INSIDE THE COVER OF THE MZ ARE:
• Installation instructions
• LP conversion kit and instructions
• A container of BIONIBAL corrosion inhibitor
• A set of union elbows and gaskets for connecting the MZ
water and gas piping
• Two (2) service drivers.
You will notice that one of the heating systems “J” pipes has an
extra 3/4" male port on it. This can be used for the return of the
Domestic Hot Water or high temperature circuit, as well as an
auto fill valve if one is required or as the appropriate place to
connect additional expansion tank, if needed. If not needed, cap
it. If you are going to use it, check to make sure that the opening
in the male port has been drilled out.
All of the parts inside the MZ’s cover are important and should be
carefully guarded during the time between unpacking the MZ
and installing it. The gaskets that are part of the connection
kit are easy to misplace. Please put them in a safe place
until ready for installation.
GETTING STATED
CHOOSING A LOCATION:
When choosing a location to mount the MZ, run length of the
venting may be the primary factor, since it has the most limiting
factors and, in the case of the concentric type, it can be
expensive.
The other factors are proximity to existing or proposed piping
and gas lines, as well as a condensate drain. It is usually
easier to run longer piping and gas lines than it is to have a
far reaching and multi-elbowed vent system. The MZ should
never be mounted outdoors open to the weather. A sheltered
outdoor location is OK, but freeze protection of the condensate
trap and drain and of the circulating fluid will be necessary in
cold climate zones.
The mounting wall should be sound and dry. Wall anchors can
be used for masonry; screws for wood and carriage bolt for
metal frames. If the wall is stone or very uneven, a pair of 2x4s
from the floor to the ceiling joists works fine. Be sure to leave
clearance for the vent if vent is exiting straight out the rear.
Clean combustion air is necessary for proper operation of
MZ units. Some dust will be brought into the MZ and will burn
in the flame. Some of the ash produced will cling to the fins of
the MZ’s heat exchanger or be carried into the condensate
trap. Some airborne substances that can be encountered in
the residential and light commercial applications that the MZ
is commonly used in can cause premature failure of
components vital to the MZ’s function. The MZ’s combustion
air must be free of chlorine, fluorine, bromine, acids, cleaning
compounds, solvents, metal dusts, metal fumes and air
contaminated with the gasses produced in animal confinement
buildings.
Take special care to avoid chlorine fumes such as from
muriatic acid commonly used for concrete cleaning. Special
care should be given to MZ installations that are near
swimming pools, laundries, beauty parlors, dry cleaners, metal
working operations, metal treating operations, industrial
plants, automobile or diesel operations, and animal
confinement facilities.
The MZ is very quiet and is rated for zero clearance to
combustibles. It requires no special utility room or fireproofing
for its location. It can be put in living spaces, pantries,
bathrooms or closets. Since it is sealed combustion, it does
not need any indoor air source of any kind though indoor air
INTRODUCTION - INSTALLATION AND TECHNICAL
II. INSTALLATION AND TECHNICAL
Products
of combustion out
Combusion air in
Concentric flue illustrated here. Pipe must
be extended to outside of structure.
Combustion chamber
Condensate collection
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