Section III. Installation | 10 |
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Reversible Inlet/Outlet Connection, cont’d.
On the MiniMax NT LN 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.
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.
Remember: The inlet and outlet markings
on the header are still correct.
Do not plumb the heater backwards.
P/N 472089 | Rev. E |
