4 | CF SERIES WWW.STIEBEL-ELTRON-USA.COM
3. Functional characteristics
The well-insulated CF is an electromechanically temperature con-
trolled water heater. Stainless steel heat exchangers heat water as it
passes through in meandering loops. Each loop contains an element
arrangement. The number of loops depend on the capacity size of the
heater. There are 3-, 6-, 12-, 18-, and 24-element versions of the CF.
Each element (1) is controlled by a separate thermostat (2) with a
customized fixed temperature setting (90, 110, 125, 145, 155, 185 °F
(32, 43, 52, 63, 68, 85 °C)). Once the water temperature equals the
thermostat set point temperature, the corresponding element is
switched off. Based on flow rate and the required temperature rise,
water is heated on-demand and no energy is wasted.
A pressure sensor switch (3) is installed in the first chamber to
eliminate any possibility of dry firing.
The delay timer (4) is user adjustable with up to 8 minutes of delay
time. This feature allows air to be purged from the system before
the element arrangement is activated to heat.
The element power supply comes from the contactor (5) over an
individual element fuse. The contactor coil is activated once the
heating on/off switch (6) is turned on, the water pressure is more
than the pressure switch threshold, and the timer delay has expired.
Additional safety is provided by individually-fused elements (the
fuses are located in the fuse box (7)), the pressure relief valve (8),
and the air vent device (9).
The transformer (10) feeds the heater on/off (11) indicator lamp.
The heater on/off (12) indicator lamp will light up once the power
supply is activated.
The hot water supply (13) and the water inlet side (14) each include
a ball valve. The knockout (15) supports the electric wires for elec-
trical hookup.
1
8
23
14
6
11
12
4
5
15
9
10
13
7
1 Element
2 Individual element thermostat
3 Pressure sensor switch
4 Delay timer
5 Contactor
6 On/off switch
7 Fuse box
8 Pressure relief valve
9 Air vent
10 Transformer
11 On/off indicator lamp
12 On/off indicator lamp
13 Ball valve, hot water supply side
14 Ball valve, inlet water supply side
15 Wire support knockout
OPERATION
FUNCTIONAL CHARACTERISTICS
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