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P/N 472235 Rev. E 4-15-05
10
7. When heads are removed, replace the heat
exchanger tube seal gaskets.
8. Exchange the inlet/outlet header with the return
header. Lift the insulation to allow the main head
to be installed. Align header with the heat
exchanger. When head is placed into position,
release the insulation; it will now shield the high
limits from the heat produced by the flue collector.
Install header bolts, and tighten snugly by hand.
(This will help avoid cross threading.) When
tightening, use a cross pattern starting from the
center of the header. DO NOT over tighten.
9. Install the temperature sensing probe by passing
the wires through the hole provided on the left
side of the brace panel. Route wires through the
support bracket.
10. Reconnect all the high limit wires and the
pressure switch wiring, routing the wires
through the same hole as the thermostat sensor
wires.
11. Pump and bleed system to check the head for
leaks.
12. Reinstall the two large inspection plates on the
appropriate side.
Reversible Inlet/Outlet Connection,
On the MiniMax NT Series heater there is insulation
installed by the factory on the return head side of the
heaters. This insulation is there so that if the heads
are reversed in the field, during initial installation of
the heater, the high limits will be insulated from the
heat radiating from the flue collector.
6. Return head in position before removal. This view
shows the insulation installed by the factory.
Remove the 8 bolts holding the return head in place.
Remember: The inlet and outlet markings
on the header are still correct.
Do not plumb the heater backwards.
cont’d.
Section III. Installation