Vision Solar Systems - 100 L Gravity Fed Type
Copyright © 2013 - 2016 Enervision. All Rights Reserved.
Issue 2.0 Mar 2013
18
Using a timer on the Electrical Heating (Optional)
Fitting a Timer
Enervision recommends that a timer is fitted to control the supply to the element. This should
exclude the peak demand periods in the morning between 7am and 10am, in the evening between
6pm and 9pm, and also between 10am and 3pm when normal solar water heating is taking place.
(On cloudy days this time zone can be overridden if hot water is required in the early evening.)
MTD 2 Type Timer
This timer is a 24 hour timer with 15 minute programme intervals and a 7 day reserve.
Connect the electrical circuit as shown in the diagram below.
Programming the Timer
Each toggle in the programming dial corresponds to a period of 15 minutes. When the toggle is
in the right hand position, the element is on and when the toggle is ion the left hand position
then the element is off. To set the timer for Eskom DSM, switch all toggles over to the right.
Turn the dial and set the toggles from 7am to 3pm to the left position. Repeat the above for the
times from 6pm to 9pm.
Turn the dial so that the current time corresponds with the actual time. Note that the timer has
a 100 hour reserve. If the power is off for more than 100 hours the time will need to be reset.
Note: there is a manual override on the timer which allows the timer function to be overridden.
For normal timer operation the override should be in the upper position and to override must
be moved down.
The MTD8 or the TDDGT Type Timer
This timer is a 7 day timer with 1 minute programme intervals and a 15 day reserve.
Connect the electrical circuit as shown on the diagram below:
