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CONTROL CIRCUITS
The heater is equipped with one of the following control circuits,
resulting in:
A. Thermostats (mechanical)... where all of the heating elements
are switched on/off by one or more thermostats. Heaters
with thermostat control are adjusted as described in TEMPERATURE
REGULATION section of this manual, see Page 19.
B. Step controlled element operation...where elements are staged
on/off individually or in groups rotationally by the controller.
An optional feature is modulation which operates in conjunction with
the staged on/off element operation.
C. Sequencer... operates in conjunction with a thermostat (mechanical).
The sequence is activated by a thermostat then the sequence
switches on the heater elements in 3 sequences (multiple elements
and contactors are required).
ELECTRICAL AND RECOVERIES DATA
Additional instructional literature is provided with heaters equipped
with modulating solid state step control or a sequencer.
All control circuits are operated on single-phase 120 volt current.
Control circuit wiring is 14 Awg, AWM (Appliance Wiring Material)
type, rated 600 volts, 105°C.
Standard equipment includes control circuit fusing.
POWER CIRCUIT
Power circuit wiring is type THHN (or equivalent) rated 600 volts,
105°C, sized as necessary.
The following wiring diagrams are included in this manual to show
typical arrangements of electrical components in the control and power
circuits by voltage and phase characteristics. They are to be used as
a reference by the installer or servicer in performing their work. An
actual diagram of the water heater wiring is furnished with the heater.
TABLE 2.
14
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