A.O. Smith CAWH 8-455-6 Installation, User And Service Manual page 39

0336078_CAWH_ENNLFRDE_V1.0, 28-02-2023
Safety devices of the installation:
Expansion vessel
Expansion valve
Pressure-reducing valve The pressure-reducing valve reduces the water
Temperature and pres-
sure relief valve (T&P
valve)
(1)
1- All installations have a T&P valve connection. The use of a T&P valve is mandatory.
The water heaters covered in this manual are
equipped with an Electronic Control system to reg-
ulate water temperature inside the storage tank.
The control system monitors the temperature from
four factory-installed temperature sensors.
The operating setpoint is adjusted to regulate wa-
ter temperature inside the storage tank. This is an
adjustable user setting in the control system's
Temperatures menu. This and all control system
menus are accessed through the user interface
module (UIM) located on the front of the water
heater.
The water heaters covered by this manual have
three modes of operation. The Operating setpoint
for each mode is adjustable:
- Efficiency mode: 35°C to 65°C (Factory Set-
ting)
- Hybrid mode: 35°C to 65°C
- Electric mode: 35°C to 82°C
The factory setting is 50°C. See Operating setpoint
adjustment for instructions on how to adjust the
Operation setpoint and other user settings.
Set the Operating setpoint at the lowest setting
that produces an acceptable hot water supply. This
will always provide the most energy efficient oper-
ation.
The expansion vessel temporarily stores expansion
water to keep the pressure in the installation at the
correct level.
The expansion valve prevents excessive pressure in
the tank of the water heater.
mains pressure, if necessary.
The T&P valve prevents excessive pressure and
temperature in the tank.
EN
37