A.O. Smith Innovo 12-160, Installation, Service & Maintenance Manual

Page: 53 / 92

Fig. Air pressure differential
H L
8.9.3 Gas supply pressure
Check the gas supply pressure:
Loosen the sealing screw (4) of the test nipple by a few turns.
Note
Do not completely loosen the sealing screw, it can be difficult to retighten it.
Open the gas supply to vent the gas pipes through the test nipple.
Connect a pressure gauge to the test nipple as soon as you smell gas.
Turn on the water heater (see section 4.2).
Set parameter
201
to
Hi
, refer to Settings (see section 10).
If necessary, create a heat demand:
Use a hot water draw-off point to tap water, or
Raise the setpoint of the water temperature, refer to Set the water
temperature (see section 4.2.2).
Wait about 1 minute.
Use the pressure gauge to read the supply pressure and compare it with the value
from the appendix Gas details (see section 13.3).
Note
Consult the mains gas supply company if the supply pressure is not correct. Take the
water heater out of service until the supply pressure is correct, refer to section
Decommissioning (see section 8.10).
Set parameter
201
to
dIS
, refer to Settings (see section 10).
Press [RESET]. The water heater goes into OFF mode.
Set the control switch on the side of the water heater to 0 to turn off the water
heater.
Shut off the gas supply.
Disconnect the pressure gauge.
Tighten the sealing screw in the test nipple.
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n
2.
3.
4.
5.
6.
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8.
n
9.
10.
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