A.O. Smith TWI 35-200, Installation, User And Service Manual

Page: 29 / 92

6 Safety
6.1 Safety instructions
For safety instructions on the use of the water heater, refer to Safety (see 2) in the User
part of this manual.
Warning
Installation, maintenance and service must be carried out by a qualified engineer in
compliance with the general and local regulations imposed by the gas, water and power
supply companies and the fire brigade. The appliance may only be installed in a room
that complies with the requirements stated in national and local ventilation regulations
(on page 4).
Warning
Leave the water heater electrically isolated until you are ready to commission it.
Caution
The water heater may only be manoeuvred in an upright position. After unpacking, make
sure that the water heater is not damaged.
Caution
Use of an incorrect roof or wall-mounted flue terminal can cause the water heater to
malfunction.
Caution
During installation, obey the instructions delivered with the sets of air supply components
and the flue gas discharge components. Make sure that the venting system does not
exceed the maximum number of 45º and 90º bends and the maximum pipe length.
Caution
Make sure that the diameter of the gas supply pipe is large enough to supply sufficient
capacity to the water heater.
Caution
Make sure that the condensate drain is connected to the waste water discharge using an
open connection.
Caution
Fill the water heater completely before use. Dry firing will damage the water heater.
Caution
After installation, maintenance or service, you must always check that the appliance is
gas tight and make sure that the gas supply pressure, the CO
2
value and the air pressure
differential are correct.
If the gas supply pressure is not correct, contact your mains gas supply company. Do not
use the water heater.
Caution
To prevent that you damage the components of the water heater, make sure that it is
completely stopped operation before you isolate the water heater from the mains (see
4.2.2). Wait 1 minute after you switch the water heater to OFF mode.
w
c
0313279_TWISTER II_UKUK_
V1.1, 18-02-2019
29