A.O. Smith 120 through 250 Series - Manual (Page 37)

Instruction manual BFC 37
is
3.11.2 Procedure to check pressures
1. There are two test nipples on the gas control:
- a supply pressure nipple (1)
- a burner pressure nipple (2)
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 re-tighten.
2. Connect a pressure gauge to the burner pressure nipple (2).
3. Open the gas supply and vent the gas supply line with the supply pressure
nipple (1).
4. Connect a pressure gauge to the supply pressure nipple (1) when gas starts
to flow from this nipple.
5. Switch on the power to the appliance using the isolator on the appliance.
6. Switch the electronic controller ON by setting the 0/I switch to position I.
The display will now show INTERNAL CHECK for about 10 seconds and
go to the main menu.
7. Activate the "ON mode" by going through the following steps:
- Press the blue arrow once ( ) to position the cursor in front of ON and
press
. The display shown here will appear.
- Confirm the by pressing START OPERATION.
The appliance is now in the "ON mode" and will ignite.
8. Once the display shows the text RUNNING you must wait about 1 minute
before reading the dynamic pressures (the fan needs this time to run up to
full rotational speed).
INTERNAL CHECK
MENU
»OFF
^ ON
È WEEK PROGRAM
»START OPERATION
^ CHANGE SETPOINT
È Tset=65ÉC
n min
0063
O I
IMD-0423 R0