Manual Honeywell ST9520C (page 5 of 34) (English)

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A typical use of the EXTRA HOUR button would be if you returned to the house for

a short period when the heating was off. Pressing the appropriate EXTRA HOUR

button gives you 1, 2, or 3 hours of heating, exactly when you need it. Another typical

use is when the heating is already on and you want it to stay on a little longer - just

press EXTRA HOUR and, for that day only, an hour will be added to the end of the

time at which heating normally goes off.

The MODE buttons allow you to select how you want to operate the heating in each

zone independently. The most obvious use is to switch heating OFF during the

summer months, but you may also use this feature if you take a mid-week day off

work, you can then set the MODE to ONCE to keep the system ON during the day

from the ﬁrst programmed ON time till the last programmed OFF time.

The way to use a Room Thermostat

The way to set and use your room thermostat is to ﬁnd the lowest temperature setting

that you are comfortable with, and then leave it alone to do its job. The best way to do

this is to set the room thermostat to a low temperature – say 18°C – and then turn it

up by one degree each day until you are comfortable with the temperature. You won’t

have to adjust the thermostat further. Any adjustment above this setting will waste

energy and cost you more money.

DT92E has a green ECO button, which enables you to set a period of time at a lower

temperature. This energy saving feature is most useful if you are out of the house

for a few hours, or if you want a reduced temperature for a while and don’t want to

have to remember to turn the temperature back up (see pages 22 & 23 for details).

Control of Your Boiler

There are several ways your boiler may be controlled. It may be switched directly

using the ST9520C timer. If installed in a remote location, it may be switched using a

BDR91T relay box. If your boiler supports the OpenTherm communications system,

it may be connected to the ST9520C timer by OpenTherm wiring, over which the

control information is sent.

In each situation the operation of the boiler is determined automatically by the

combination of inputs from the room thermostat and the timer, and in such a way as

to maintain your comfort with minimal energy use. The timer will indicate the on/off

status of the boiler by showing the ﬂame symbol

Optimisation (see page 17 for explanatory diagrams)

Your control system has some features called Optimisation, which aim to save

energy while making you as comfortable as possible. These may or may not be

enabled – check page 34 where your Installer should have indicated how these

were set. Optimisation does not apply to your Hot Water, only to your Heating.

CONTROL OF YOUR SYSTEM

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Honeywell ST9520C Manual

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