56 Connecting the Gas Supply
8. Unfasten the 4 latches (2 at the top and 2 at the
bottom) to remove the front cover and gain
access to the internal components.
9. Loosen the screws indicated in the figure below
and connect a manometer to the pressure port.
Reset the manometer to zero before use.
Digital
pressure
manometer
10. Re-open the manual gas valve and check for
leaks.
11. Activate multiple zones to ramp the boiler up to
its maximum firing rate.
12. When the boiler reaches its maximum firing
rate, check the inlet gas pressure reading on the
manometer. The gas pressure must fall within
the ranges specified on page 8.
To measure the inlet gas pressure:
1. Shut off the manual gas valve on the gas supply
line.
Gas Valve
Opened
Closed
2. Turn on the boiler. On the front panel, press the
Back button (
) and the Menu button (
)
simultaneously for 3 seconds, and then rotate
the Command dial (
) to move to “7. Special
Operations”.
3. Press the Command dial (
) to enter special
operation mode.
4. Rotate the Command dial (
) to move to
7. SH
2nd MAX
, and then press the Command dial
(
) to select the operation mode.
5. Press the Back button (
) twice to return to
normal operation mode.
6. Run space heating. The gas in the gas supply
line will be purged.
7. Leave the boiler on until the boiler shuts down
due to a lack of gas supply, and then turn off the
boiler.
Summary of Contents for NCB-190/060H
Page 141: ...141 Appendixes 12 6 4 Fan Gas Assembly 10 9 12 8 7 3 1 2 4 5 6 13 11 11 14 15...
Page 143: ...Memo...
Page 144: ......
