A.O. Smith BFM - 100, Installation & Service Manual

Page: 63 / 74

Instruction manual BFM 63
s
12 Performing
maintenance
12.1 Introduction Caution
Maintenance may only by carried out by an approved service and
maintenance engineer.
At each service, the appliance undergoes maintenance on both the water side
and the gas side. The maintenance must be carried out in the following order.
1.
Water-side maintenance
2. Water-side maintenance
3. Gas-side maintenance
4. Finalising maintenance
Note
Before ordering spare parts, it is important to write down the appliance type
and model, and the full serial number of the appliance. These details can be
found on the rating plate. Only by ordering with this information can you be sure
to receive the correct spare parts.
12.2 Preparation for
maintenance
To test whether all components are still working properly, complete the following
steps:
1. Set the ON/OFF switch on the control panel to
position 0 .
2. Set the control thermostat to the highest value (note the original setting) and
set the ON/OFF switch back again to position I .
3. If there is no heat demand, draw off some water to create a heat demand.
4. Check whether the heating cycle
(9.3 "The appliance's heating cycle") runs
correctly.
5. Set the control thermostat back to the original setting and set the ON/OFF
switch back again to position I .
6. Check the supply and burner pressure (3.11 "Checking the supply pressure
and burner pressure") , and adjust them if necessary.
7. Check that all components of the chimney flue system are properly attached.
8. Test the operation of the overflow valve of the protected cold supply set-up.
The water should spurt out.
9. Test the overflow operation of the T&P valve. The water should spurt out.
10. Test the overflow operation of the T&P valve. The water should spurt out with
a strong jet.
11. Check the drainpipes from the discharge points of all valves and remove any
scale deposits that may be present.
12. Drain the appliance (6 "Draining") .