A.O. Smith STE - 1000, Installation, User And Service Manual

Page: 85 / 112

Installation, User and Service Manual STE
85
5 Draining
Legend
Unused numbers are not
applicable.
1. pressure reducing valve
(mandatory if the mains
water pressure is too
high)
2. inlet security group
(mandatory)
3. T&P valve (mandatory -
factory delivered)
4. stop valve
(recommended)
5. non-return valve
(mandatory)
6. circulation pump
(optional)
9. drain valve
11. service stop valve
(recommended)
12. temperature gauge
(recommended)
A. cold water supply
B. hot water supply
C. circulation pipe
Installation diagram
T
Some service activities require the water heater to be drained. The procedure is as
follows:
1. Switch the water heater OFF by using the ON/OFF switches of the electrical
elements and main switch on the control unit.
2. Isolate the water heater from the power supply by setting the isolator between the
water heater and the mains power supply to position 0.
3. Close the stop valve (11) in the hot water pipe.
4. Close supply valve in the cold water inlet (A).
5. Open drain valve (9).
6.
Bleed the water heater (or installation) so that it drains completely.