Specifications

7211270100 Rev03 9
Option 3 – Control Wiring Solution using a Timer
• Used in lieu of a utility-supplied timing device.
• An example is Ontario where the Smart Meters do not include physical contacts to
synchronize the system to.
• This solution requires an accurate timer programmed with the Utility's Off-Peak
schedule. An example is the Intermatic ET1725C with 7 day programmability, battery
backup and changes automatically for daylight savings time.
• The timing device must be rated for switching 240 volts.
• In this application, the storage heater will charge when the timer is in “off mode”. The timer
must open the control circuit during Off-Peak periods and close for Peak periods.