Description :      Program schedules allow you to specify which times of the day you want your heating to come on and to what temperature you would like it to maintain your house. The RT520 Series Thermostat comes with some pre-set default program schedules which you can use as is, or easily change to meet your personal requirements.

Types of Schedules :   

The RT520 Series Thermostat has three different programming modes in which you can program schedules. 

5/2 :                        The first option defines two sets of program schedules. One set of times and temperatures will be used for the week period (Monday to Friday) and another separate set that will be used only at the Weekend, hence 5 / 2. 

Individual :              The second option lets you define a program schedule for each day of the week individually, so you can have your heating come on at different times and at different temperatures every day. 

All :                          The last option lets you define one program schedule that will apply to all seven days of the week. 

The Schedules :      Each program schedule contains 6 start times and 6 set points to define your required temperature. It is recommended when programming a schedule to complete all 6 set points.

The start times must be set sequentially, so each must be set at a later time than the one before. ie. program 2 must have a later start time than program 1. Your RT520 Series Thermostat will prevent you from entering a time before the previous setpoint so as not to cause conflicts and prevent your thermostat from appearing as if it is not be working correctly.

                                Temperature setpoints are set for each of the program start times.

Operation :             Your RT520 Series Thermostat works in a manner where the program schedules maintain a series of temperatures that you set throughout the day, unlike the old central heating programmers that had defined On and Off times.

                                Therefore, when you set a temperature setpoint your heating will turn on to reach the setpoint and then periodically turn on and off to maintain that temperature until the next defined setpoint temperature.

                                For example, if your first setpoint of the day is at 22’C and your second at say 11am is set to 20’C then at 11am your heating will allow your room to cool down from 22’C to 20’C. If your room falls below 20’C then your heating will turn back on to enable the room to be kept at that temperature even if the third setpoint is not until 5pm when you want your heating to come back up to say 22’C. So even though your second setpoint is the lowest, it is not an ‘Off’ time and your heating will keep turning on and off to maintain the minimum temperature of 20’C that you set.

Examples :              Below are some examples of program schedules with an explanation of how they operate.

Start Time	Setpoint Temperature
06.00am	20̊
08.00am	14̊
12.30pm	20̊
1.30pm	14̊
5.30pm	22̊
11.00pm	10̊

This example may be used by a household who are out at work during the day.

06:00am    The heating comes on and warms the house to 

                  20 ̊c for waking up and getting ready for work.

08:00am    Having left for work, the house is now allowed to                                                                     cool to a temperature of no lower than 14 ̊c to save energy.

12:30pm    The temperature is increased to 20 ̊c so the house is not cold when returning home from work for lunch.

1:30pm     Again, as the house is empty the temperature is         lowered to save energy.

5:30pm     Everyone is now on their way home from work, so the house is made warm and comfortable for their arrival.

11:00pm    The house is now allowed to cool for a comfortable     night’s sleep, and the low temperature will prevent the heating from switching on.

Start Time	Setpoint Temperature
08.00am	21
11.00am	21
2.00pm	21
5.00pm	21
8.00pm	21
10.00pm	10

This example may be used at a weekend when the household occupants are in the house during the day, and they simply want the heating on at a constant temperature until the end of the day.

08:00am    The heating comes on and warms the house to a comfortable temperature of  21 ̊c .

11:00am    The heating is still set to maintain the temperature of 21 ̊c to keep the house comfortable throughout the day.

2:00pm      As a constant temperature is required the                   5:00pm      setpoints are all set to the same value until the      8:00pm      last setting of the day.

10:00pm   A lower temperature is now set to turn the heating off and allow the house to cool down overnight to no lower than 10 ̊c.

Below is an example of a common mistake made in the program schedules which makes it appear that the thermostat is not working and is randomly turning the heating On and Off.

Start Time	Setpoint Temperature
06.00am	22
08.00am	20
12.30pm	22
1.30pm	20
6.00pm	22
11.00pm	10

In this example the common mistake made is that the user is trying to emulate the ON and OFF times of an older programmer but has not set the ‘OFF’ times to a low enough temperature.

They therefore think that the heating will turn On at 06:00am until 08:00am at which point it will switch Off until the next setpoint at 12:30pm. Then again, they think the heating will be ‘On’ until 1:30pm when it is switched ‘Off’ until 6:00pm and so on.

They are then surprised when the heating is turning On and Off randomly all through the day. In actual fact the thermostat will not let the room fall below 20 ̊c  and so will keep turning on the heating to maintain that temperature.

If you want the heating to turn off for a period of time you need to set the effective ‘Off’ temperature to be well below the normal room temperature for example 10 ̊c  as shown in the last setting for the night.