Rev. B 1-22-04 P/N 472235
15
WATER CONNECTIONS
Reversible Inlet/Outlet Connection
The MiniMax NT/TSI Low NOx heater is factory
assembled with right side inlet/outlet water
connections. The inlet/outlet header can be reversed
for left side water connections without removing the
heat exchanger.
Reversing Water Connections
Tools required:
1/4 in. Screw Driver
9/16 in. Socket and Wrench
1/2 in. & 9/16 in. Open Wrench
1. Remove the right and left large inspection plates.
2. Disconnect all wires from the high-limit
switches except the short jumper wire.
NOTE
There is no reason to remove the high-limit and
pressure switches or the thermistor from the front
header during the reversing procedure, as they
will be in the proper location when installed on the
left side.
3. Disconnect the pressure switch wiring.
4. Remove the temperature sensing bulb from the
inlet/outlet header. Note: If needed, you may cut
the wire ties holding them together.
5. Remove the 16 bolts holding the main inlet/
outlet head and return head in place, exchange
the heads, using the new tube seals supplied
with the heater, re-install the 16 bolts using
moderate torque.
6. 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.
7. Reconnect all the high limit wires and the
pressure switch wiring, routing the wires
through the same hole as the thermostat sensor
wires.
8. Re-install the two large inspection plates on the
appropriate side.
Installation (Water Connections)
INSULATING THE HIGH LIMITS
When Reversing Heads on the
MiniMax NT/TSI Low NOx Heater
On the MiniMax NT/TSI Low NOx 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 reflected heat from the flue collector
will be insulated from the high limits.
Return head in position before removal.
This view shows the insulation installed by the factory.
Return head removed and new tube seals installed.
Now ready to accept the installation of the main head.
Lift the installation to allow the main head to be installed.
When head is placed into position, release the insulation;
it will now shield the high limits from the heat produced
by the flue collector.
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