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14
GAS-FIRED HEATER Installation Manual
PART 5: MUNCHKIN CONTENDER PIPING
(CONTINUED)
2. Expansion tank must be located as shown in
Piping Part 5, or following recognized design
methods. See tank manufacturer’s
instructions for details.
3. Connect the expansion tank to the air
separator only if the separator is on the
suction side of the circulator. Always install
the system fill connection at the same point
as the expansion tank connection to the
system.
4. Most chilled water systems are piped using a
closed type expansion tank.
Diaphragm (or bladder) expansion tank
1. Always install an automatic air vent on top of
the air separator to remove residual air from
the system.
F. CIRCULATORS
Sizing space heat system piping
1. See Piping Details in this manual Part 5. In all
diagrams, the space heating system is
isolated from the heating loop by the
primary/secondary connection.
2. Size the piping and components in the space
heating system using recognized design
methods.
G. HYDRONIC PIPING WITH CIRCULATORS,
ZONE VALVES AND MULTIPLE HEATERS
The Munchkin Contender is designed to function
in a closed loop 15 PSI System. A factory installed
water pressure switch will ensure that you have
adequate pressure in the system. The Munchkin
Contender will not operate without a minimum of
10 PSI water pressure. This assures you that if the
system does have leak, the Munchkin Contender
will lock out (PRO on the display) before it
damages the Stainless Steel Heat Exchanger. We
have also included a Temperature and Pressure
gauge which allows the user to monitor the
system pressure and outlet temperature from the
Munchkin Contender. It is important to note that
the Munchkin Contender has a minimal amount
of pressure drop and must be calculated when
sizing the circulators. Each Munchkin Contender
installation must have an Air Elimination device
that will remove air from the system. Install the
Munchkin Contender so the gas ignition system
components are protected from water (dripping,
spraying, etc.) allowing clearance for basic
service of circulator replacement, valves and
other. Observe minimum 1” clearance around all
un-insulated hot water pipes when openings
around pipes are not protected by non-
combustible materials. On a Munchkin Contender
installed above radiation level, some states and
local codes require a low water cut off device at
the time of installation (See Part C this section). If
the Munchkin Contender supplies hot water to
heating coils in air handler units, flow control
valves or other devices must be installed to
prevent gravity circulation of heater water in the
coils during the cooling cycle. Chilled Water
Medium must be piped in parallel with the heater.
Freeze Protection for new or existing systems
must use glycol that is specifically formulated for
this purpose. It will include inhibitors that will
prevent the glycol from attacking the metallic
system components. Make certain that the
system fluid is checked for the correct glycol
CAUTION
Undersized expansion tanks cause system
water to be lost from relief valve and makeup
water to be added through fill valve. Eventual
failure can result due to excessive make-up
water addition.
CAUTION
DO NOT install automatic air vents on closed-
type expansion tank systems. Air must remain
in the system and return to the tank to provide
its air cushion. An automatic air vent would
cause air to leave system, resulting in water-
logging the expansion tank.
CAUTION
DO NOT use the heater circulator in any location
other than the ones shown in this manual. The
heater circulator is selected to ensure adequate
flow through the Munchkin Contender. Failure
to comply could result in unreliable
performance and nuisance shut downs from
insufficient flow.