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ADJUSTING MANIFOLD PRESSURE:
The manifold gas pressure of the tankless unit can be adjusted by the following procedure.
Adjusting the manifold pressure can cause unexpected combustion conditions during
operation, which can cause a health hazard, damage the tankless unit, and or shorten its
lifespan. Therefore, changing the manifold pressure is not recommended unless there
are very strong reasons to do so (e.g. high elevation installations), and with the
consultation of the technical service department.
WARNING
1) Set up the manometer by following steps 1 through 4 on the "Checking manifold gas
pressure" procedures on p. 21.
2) Press and hold down the "MIN" button on the computer board. While holding down the
"MIN" button, press either the "INCREASE" or "DECREASE" button to increase or decrease
the manifold gas pressure, respectively (Figure 2). Refer to the manometer to verify that
pressure has been set to desired value.
3) Now press and hold down the "MAX" button on the computer board to change the
maximum burn pressure.
4) Repeatedly adjust the minimum and maximum pressures again until both levels are stable
and there are no more changes from the previous iteration.
5) After the manifold gas pressure has
been set, deactivate the unit (stop all
water running through the unit),
remove the manometer tube, and
replace the port screw.
RESETTING THE COMPUTER BOARD:
1) Verify that there is no water flowing
through the unit.
2) If a temperature remote controller has
been installed, turn the power off to
the remote.
3) Turn off power to the unit, and then
turn on again.
4) Push and hold the "INC" and "DEC" buttons on the computer board simultaneously for
several seconds until the red LED lights up solid.
5) Use the Power ON‐OFF switch/GFI to turn the unit off then on again. The computer board is
reset.
Figure 23
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Troubleshooting Guide
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