Note: Co Measuring Position; Adjusting In Case Of A New Water Heater, Or After Maintenance (Case A); General Remark; Checking And Adjusting The Top Burner - Lochinvar TTW Series Installation, Commissioning And Maintenance Instructions

20.1.7 NOTE: CO MEASURING POSITION
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This chapter describes the procedure for adjusting and checking CO
measuring hole for adjusting the top burner and the lower measuring hole for adjusting the bottom burner.
When both burners are on, a deviation from the single burner measurements occurs: the upper hole shows CO
value, the lower hole shows CO
be used to check the nominal CO
If possible, measuring CO in the flue gas outlet outside the water heater, at the back, is preferred. The reason is that the flue gas in the common
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outlet is better mixed and measurements are less deviating, regardless of whether the top or the bottom burner is on, or both. This means that
measuring and adjusting is easier: neither change of measuring hole, nor averaging values is necessary.
For an extensive description consult the next two sections (choose which is applicable, A or B):
20.2

ADJUSTING IN CASE OF A NEW WATER HEATER, OR AFTER MAINTENANCE (CASE A)

20.2.1

GENERAL REMARK

For all adjusting steps under A the following must be applied: no adjustment is required if measured values are within the margins shown in
20.1.2
20.2.2

CHECKING AND ADJUSTING THE TOP BURNER


Start top burner.

On the left control panel (controlling the top burner), go to service mode: press [SERVICE] button for about 4 seconds. After start-up
it shows:
Display message
Water heater is activated and operates at service mode at minimum.
NB! The service mode of the water heater will be active for 40 minutes. After this the water heater will return to normal operation.
Make sure that only one burner is burning: the green LED on the other panel should be off.
Also check that the fan of the bottom burner is not running: the error message "NRV or fan fault" should not be on the display of the
right panel.
Maximum load adjustment.

Press [▲] button until maximum load is reached:
Display message
Water heater is activated and operates at service mode at 100% (maximum) (example).

Measure CO in the upper measuring hole (top burner).
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Adjust the CO within ± 0.1% according to figures shown in 20.1.2 using key [2]:
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Decrease CO percentage
2
Increase CO percentage
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values lower than the nominal value. However, the average value of the upper and lower measurements can
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percentage.
2
W A T R
> > >
W A T R
> > >
CO2
CO2
values by measuring at the front of the water heater, using the upper
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R : S e r
H T
1 2 3 . 4 ° C
R : S e r
H T
1 2 3 . 4 ° C
[2] Turn screw [2] right (clockwise)
[2] Turn screw [2] left (counter clockwise)
values higher than the nominal
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v i c e 3
( 1 2 3 . 4 °
v i c e 1 0
( 1 2 3 . 4 °
0 %
C )
0 %
C )
96