A.O. Smith 710 ASME, Руководство по обслуживанию

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710 / 710 ASME Service Manual
Ver. 1.00
67
CONFIDENTIAL
12-15. Adjusting manifold gas pressure
The manifold gas pressure on the 710 can be adjusted by following the procedures below.
Adjusting the manifold pressure can cause unexpected combustion conditions during
operation, which can cause a health hazard, damage the 710, and/or shorten its lifespan.
Therefore, changing the manifold pressure is not recommended unless there are very
strong reasons to do so (e.g. high elevation installations), and with the consultation of the
Technical Services Department.
Adjusting maximum manifold pressure
1. Ensure that 710 do not in operation.
2. Remove the screw off the manifold port of the 710. (Figure 1)
3. Connect a manometer to the manifold port using a tube (Figure 2). Ensure that this connection is
secure enough to prevent gas leak.
4. Run water through the 710 to activate its operation. If presence of a gas leak is detected,
immediately shut off the 710 and inspect the tube / manifold connection; otherwise, proceed
onto the next step.
5. Press and hold down the “MAX” button on the computer board. While holding down the “MAX”
button, press either the “Increase” or “Decrease” button to increase or decrease the manifold gas
pressure, respectively (Figure 3). Refer to the manometer to verify that pressure has been set to
desired value.
6. After gas pressure has been set, deactivate the 710, remove the manometer tube, and replace the
port screw.
Adjusting minimum manifold pressure
1. Ensure that 710 do not in operation.
2. Remove the screw off the manifold port of the 710. (Figure 1)
3. Connect a manometer to the manifold port using a tube (Figure 2). Ensure that this connection is
secure enough to prevent gas leak.
4. Run water through the 710 to activate its operation. If presence of a gas leak is detected,
immediately shut off the 710 and inspect the tube / manifold connection; otherwise, proceed
onto the next step.
5. Press and hold down the “MIN” button on the computer board. While holding down the “MIN”
button, press either the “Increase” or “Decrease” button to increase or decrease the manifold gas
pressure, respectively (Figure 3). Refer to the manometer to verify that pressure has been set to
WARNING