A.O. Smith ADM-40 Installation, User And Service Manual page 31

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3.10.1
Instruction manual ADM
Reading off and adjusting
1. Isolate the appliance from the mains power (10.3 "Isolating the appliance
from the mains").
2. To check the supply pressure, test nipple (6) is used. The manifold test
nipple (8) is used for measuring the burner pressure.
Sealing screws are located inside the test nipples. Loosen both sealing
screws by a few turns. Do not completely loosen them; they can be difficult
to retighten.
3. Connect a pressure gauge to the manifold test nipple (8).
4. Open the gas supply and bleed the air from the mains gas supply via test
nipple (6).
5. Connect a pressure gauge to the manifold test nipple (6) when gas starts to
flow from this nipple.
6. Switch on the power to the appliance using the isolator on the appliance.
7. Set the control thermostat to the maximum temperature and start the
appliance running by setting the ON/OFF switch to position I.
8. The heating cycle will start, and after a short time the burner tray will ignite.
9. After the burner tray has ignited, wait approximately 1 minute before reading
the dynamic pressures.
Note
If the burner pressure is not correct and the appliance is fitted with a blank
plate or high-low control, you will not be able to adjust the pressure. In this
case, consult your installation engineer or supplier. If the appliance is indeed
fitted with a burner pressure regulator, the pressure can be
adjusted (3.10.1 "Reading off and adjusting").
10. Adjust the burner pressure by turning the adjusting screw (10), depending
on the correction required:
- Adjustment screw anticlockwise: burner pressure decreases.
- Adjustment screw clockwise: burner pressure increases.
11. Cover the opening of the adjusting screw and check the burner pressure
against the value given in the gas data table (3.4.3 "Gas data").
12. If the pressure reading is not correct, repeat the burner pressure adjustment
until the correct pressure is reached.
13. Fit the cap (9) back on the burner pressure regulator.
14. Shut off the gas supply.
15. Disconnect the two pressure gauges and retighten the sealing screws in the
test nipples.
Note
Before starting the appliance up, take time to fill in the warranty card
supplied with the appliance. This enables us to guarantee the quality of our
systems and further enhance our warranty procedure.
16. Please return this card as soon as possible. Your customer will then receive
a warranty certificate with our warranty conditions.
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