A.O. Smith SGS - 100 Installation & Service Manual page 94

15
94
Performing maintenance
6. Switch the electronic controller ON by setting the ON/OFF switch to
position I.
INTERNAL CHECK
The display will now show INTERNAL CHECK for about 10 seconds, and
will then go to the main menu.
MENU
»OFF
^ ON
È WEEK PROGRAM
7. Activate "ON mode" by going through the following steps:
- Press once on the blue arrow ( ) to position the cursor beside ON,
then press
- Confirm the selection START OPERATION with
8. If there is no heat demand, increase Tset
temperature"). Note the original setting. Draw some hot water off to create
heat demand.
9. Check whether the heating cycle runs correctly
heating cycle").
10. If you have adjusted T
set
water temperature").
11. Remove the plastic cover on the top of the appliance.
12. Check the supply and burner pressure
and burner pressure"), and adjust them if necessary.
13. Check that all components of the chimney flue system are properly attached.
14. Check the pressure differential across the orifice plate of the pressure switch
(see the table). If the pressure difference is too low, the heat exchanger must
be cleaned (15.4.4 "Cleaning the heat
Pressure switch pressure differential
Appliance
SGS 80
SGS 100
15. Test the operation of the overflow valve of the protected cold supply setup.
The water should spurt out.
16. Test the overflow operation of the T&P valve. The water should spurt out.
.
(11.4 "Setting the water
(9.3 "The appliance's
, return it to the desired value
(3.13 "Checking the supply pressure
exchanger").
Observed pressure differential across
the pressure switch (Pa)
> 1005
> 1145
Instruction manual SGS
s
.
(11.4 "Setting the