A.O. Smith BFC - 28 - Manual (Page 86)

Maintenance
86 Instruction Manual BFC
12
s
The display will now show INTERNAL CHECK for about 10 seconds, and
will then go to the main menu.
7. Activate the “ON mode” by going through the following steps:
- Press once on the DOWN button (L) to position the cursor beside ON ,
then press E. The display shown in Figure 12.5 appears.
- Confirm with E the option START OPERATION.
8. If there is no heat demand, increase T
set
. See paragraph ’8.4 Setting the
water temperature’ (take note of the original setting) and draw off some
water to create a heat demand.
9. Check whether the heating cycle runs correctly. See paragraph ’7.4 The
appliance’s heating cycle’ .
10. If you adjusted T
set
, return the setting to the original value. See paragraph
’8.4 Setting the water temperature’ .
11. Remove the plastic cover on the top side of the appliance.
12. Check the supply and burner pressures and adjust these, where necessary.
See paragraph ’3.11 Checking the supply pressure and burner pressure’ .
13. Check that all components of the flue gas system are properly attached.
14. Check the pressure differential across the orifice plate of the pressure
switch. See Table 12.1 . If the pressure differential is too low, then the heat
exchanger should be cleaned. See paragraph ’12.5 Finalising
maintenance’ .
15. Test the operation of the overflow valve of the cold supply setup. The water
should spurt out.
16. Test the overflow operation of the T&P valve. The water should spurt out.
17. Check the wastewater pipes of the overflow valves and remove any lime
buildup that may be present.
18. Drain the appliance. See paragraph ’4.3 Draining the appliance’ .
INTERNAL CHECK
Figure 12.3 Internal check
MENU
»OFF
^ ON
È WEEK PROGRAM
Figure 12.4 Main menu
»START OPERATION
^ CHANGE SETPOINT
È
Tset=65ÉC
Figure 12.5 Starting up
Table 12.1 Pressure switch differential
Appliance Observed pressure differential across the pressure switch
(Pa)
BFC 28 > 635
BFC 30 > 885
BFC 50 > 885
BFC 60 > 1085