HTP MODCON1000 - Optional Flow Switch

LP-428 Rev. 6.6.16
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Figure 21 - MODCON Internal Connection Diagram
on the inlet side.
2. Locate the two pigtails hanging from the electrical box inside
of the boiler cabinet. Remove and discard the jumper plug from
one of the unused pigtails.
3. Connect the low gas pressure switch to the pigtail that you
removed the jumper plug from.
M. Optional Flow Switch
NOTE: Follow the more detailed instructions included with the
ow switch kit for proper installation steps.
NOTE: The boiler requires two (2) ow switches to ensure
there is enough ow through each heat exchanger of the boiler
assembly.
1. Attach the correct ow paddle to the ow switch.
2. Thread brass tee onto outlet nipple using pipe dope. Make
certain the branch points up on horizontal runs.
3. Thread ow switch into tee using pipe dope. Make certain
the FLOW arrow points in the correct direction.
4. Disconnect red wire on the low water cut o probe and
connect it to the red wire from the wire harness (included in
kit).
5. Feed green ground wire into boiler through the wire access.
6. From the front of the boiler, feed the ground wire up into
the control box.
7. Once into the control box, attach the green ground to the
ground bus connection.
8. Connect red wire from ow switch to boiler wire harness.
9. When installation is complete, power up the boiler and use
the control to access installer parameter #20 and change the
default value to 2 (see Part 10 in this manual). When done,