Navien LCB700-21RS Installation & Operation Manual page 75

Measuring Combustion and Adjusting Oil Pressure
Measure combustion 2 minutes after boiler
Note
operation.
Forced operation of the Low/High operation mode
can be set by selecting the PCB DIP and panel
settings.
- PCB DIP Switch 1 (set of 6): See page 38.
1) Normal (Default): 1-OFF, 2-OFF
2) Stage 1 (Low): 1-OFF, 2-ON
3) Stage 2 (High): 1-ON, 2-OFF
- Panel: See page 66.
1) Normal (Default)
2) Stage 1 (Low)
3) Stage 2 (High)
Restore to Normal (default) operation mode after
completing the test.
1. Loosen the screw located at the middle and bottom of the
heat exchanger and remove the cap and packing.
2. Insert the analyser in the port and measure the combustion.
1-ON, 2-ON
Packing
Cap
Screw
3. Using a 4 mm Allen wrench, adjust the oil pump pressure at
the top of the burner based on the following table
(+: Clockwise, -: Counterclockwise).
Stage 2
Measure combustion two minutes after boiler
Note
operation.
Control the oil pressure based on the CO
levels.
Refer to the following table to adjust the oil
pressure properly.
Description 21
5.5%
O
Low
2
(5.0–6.0%)
Mode
11.4%
(Stage 1)
CO
2
(11.1–11.8%)
4.5%
O
High
2
(4.0–5.0%)
Mode
12.2%
(Stage 2)
CO
2
(11.8–12.5%)
CAUTION
When controlling the kerosene pressure, ensure not to
exceed 6 bar in low mode and 12 bar in high mode. It may
cause combustion noise and/or soot deposits.
Review with the Owner
1. Review the User's Information Manual with the owner.
2. Emphasize the need to perform the maintenance schedule.
3. Remind the owner of the need to call a licensed contractor
should the boiler or system exhibit any unusual behaviour.
4. Remind the owner to follow the proper shutdown procedure
and to schedule an annual start-up at the beginning of the
next heating season.
Stage 1
or O
2 2
28 36
5.0% 4.5%
(4.5–5.5%) (4.0–5.0%)
11.8% 12.2%
(11.4–12.2%) (11.8–12.5%)
4.5% 4.5%
(4.0–5.0%) (4.0–5.0%)
12.2% 12.2%
(11.8–12.5%) (11.8–12.5%)
Maintaining the Boiler 75