Adjustable Electric water heater controller
The EAT500 series controls are designed to
meet the high electrical capacity requirements of electric water heaters. Both
use a temperature sensitive bimetal disc to deliver snap-action to the
contacts. The speed and force of contact separation provides long-dependable
control life at high electrical loads.
Switch Actions
The EAT500 is available in two switch
actions: Automatic reset SPST – The switch opens the normally closed contacts
on temperature rise. The contacts automatically return to the closed position
when temperatures return to the reset point. Automatic reset SPDT – This
operation is the same as the SPST with the addition of an auxiliary set of
contacts, which make circuit upon opening of the normally closed contacts and
breaks this circuit upon automatic reset.
Specification
Supply Voltage : 90VAC ~ 260VAC
Power consumption : 0.6 VA
Internal sensor: NTC
Control: ON/OFF control
Setting : Analog setting
Control output : Relay output –SPNO, 40A 240VAC
Storage temperature : -10~80℃
Operating temperature : -10~75℃
Temperature accuracy : ± 2℃
On-off differential : customize
Insulation resistance : DC500V/100MΩ,AC1200/10mA/1sec.
Weight : 78 g
Terminal recommend tightening torque : 15kgf-cm
Size : 87.6mm x 47mm x 27.2mm
Life expectancy(Relay): 30000 times (frequency: 900 times/hr)
- Zero-Arc algorithm extends Relay's life cycle
- 10–32 tin plated terminal screws for electrical connections
- Single pole, single throw or single pole, double throw, open on temperature rise construction
- Welded construction used on all internal current carrying components for greater electrical integrity
Typical Application
The thermostats and wiring diagram (shown
on next page) are typical of a residential electrical storage water heater
installation using two heating elements for non-simultaneous operation. The
upper electrical control is a combination EAT500 SPDT regulating thermostat and
a AT500PM DPST manual reset limiting thermostat. The lower electrical control
is a EAT500 SPST electric thermostat. All the thermostats sense the surface
temperature of the water heater tank. The AT500PM function is to provide full
power disconnect (through both power conductors) in the event of an overheat
condition. The EAT500 SPDT normally closed contacts route power to the upper
heating element. When the EAT500 SPDT control reaches its set temperature, its
switch action breaks power to the upper heating element and switches power to
the lower heating element through the normally closed contacts of the EAT500
SPST. When its set point is satisfied, the switch action breaks power to the
lower heating element.