Checking And Adjusting The Bottom Burner; Checking Both Burners - Lochinvar TTW Series Installation, Commissioning And Maintenance Instructions

Minimum load adjustment.

Press [▼] button until minimum load is reached.
Display message
Water heater is activated and operates at service mode at minimum.

By setting screw [3], adjust the gas valve to obtain the CO

Decrease CO percentage
2
Increase CO percentage
2
Repeat adjustments:

Check again at maximum load and adjust if necessary.

Check again at minimum load and adjust if necessary.

Repeat previous steps until measurements match shown in 20.1.2.

Switch the top burner off (press service button).
20.2.3

CHECKING AND ADJUSTING THE BOTTOM BURNER


On the right control panel, go to service mode (press [SERVICE] button for 4 seconds). Make sure that only the bottom burner is on:
the green LED on the left panel (top burner) should be off. Also check that the fan of the top burner is not running: the error message
"NRV or fan fault" should not be on the display of the left panel.

Set the load at maximum by pressing the [▲] button.

Measure CO in the lower measuring hole (bottom burner).
2

Adjust the CO within ± 0.1% according to shown in 20.1.2 using key [2].
2

Set the load at minimum by pressing the [▼] button.

Adjust the CO within ± 0.1% according to shown in 20.1.2 using key [3].
2

Check again at maximum load and adjust if necessary.

Check again at minimum load and adjust if necessary.

Repeat previous steps until measurements match shown in 20.1.2 .

Switch the bottom burner off (press [SERVICE] button).

20.2.4

CHECKING BOTH BURNERS

To switch both burners on at the same time: switch to service mode, set one burner at 50% load using the [▲] and/or [▼] buttons. While this
burner is on, switch the other burner to service mode (press [SERVICE] button for 4 seconds). After start-up, set it also at 50% load.

To set both burners at maximum load, press [▲] buttons on both panels simultaneously.

Measure CO in the upper measuring hole (top burner); a tolerance of -0.1 to + 0.3% of the shown in 20.1.2 value is acceptable. Note
2
down this value.

Measure CO in the lower measuring hole (bottom burner); a tolerance of - 0.3 to +0.1% of the shown in 20.1.2 value is acceptable.
2
Note down this value.

Calculate the average of these two measurements: add the upper and lower values and divide by two.

If this average CO
deviation is larger than ± 0.1%, check and re-adjust burners separately again.

To change to minimum load, press [▼] buttons on both panels simultaneously.

Check CO for the minimum load: measure CO
2
table16.1 value is acceptable. Note down this value.

Measure CO in the lower measuring hole of the bottom heat exchanger; a deviation down to - 0.3% of the shown in 20.1.2 value is
2
acceptable. Note down this value.

Calculate the average of these two measurements: add the upper and lower values and divide by two.

If this average CO
check and re-adjust burners separately again.
If measurements at maximum and minimum match shown in 20.1.2 within ± 0.1%, adjustment is completed.

Switch burners off (press [SERVICE] buttons on both panels).
W A
> > >
at maximum matches shown in 20.1.2 within ± 0.1%, proceed with the next step: checking at minimum load. If the
2
at minimum matches shown in 20.1.2 within ± 0.1%, adjustment is correct. If the deviation is larger than ± 0.1%,
2
R : S
T R H T
1 2 3 . 4
value shown in 20.1.2
2
C O 2 [ 3 ]
C O 2 [ 3 ]
in the upper measuring hole of the top heat exchanger; a deviation up to + 0.3% of the
2
e r v i c e
° C ( 1 2 3 .
Turn key [3] left (counter clockwise)
Turn key [3] right (clockwise)
3 0 %
4 ° C )
97