SIR 020 / SIR 021 / SIR 022
Countdown Timer
Installation and User Instructions
1
SIR 020 / SIR 021 / SIR 022
The SIR range of countdown timers can be used to
control immersion elements and other electrical
appliances up to 3kW or as an override/extension
timer for central heating systems.
INSTALLATION AND CONNECTION SHOULD
ONLY BE CARRIED OUT BY A SUITABLY
QUALIFIED PERSON AND IN ACCORDANCE
WITH THE CURRENT EDITION OF THE IET
WIRING REGULATIONS.
WARNING: ISOLATE MAINS SUPPLY BEFORE
COMMENCING INSTALLATION AND ENSURE
THE UNIT IS PROPERLY EARTHED.
2
LED-2
LED-1
LED-3
BOOST
Button
The LEDs become operational when the unit is
powered up.
3
User instructions
To operate the unit press the BOOST button repeatedly
until the indicator light for the required BOOST period is
illuminated (see table below).
st
Model 1
SIR 020 15 min 30 min 60 min off
SIR 021
SIR 022 2 hour 4 hour 6 hour off
time button
press
½ hour 1 hour 2 hour off
nd
2
time button
press
3rdtime button
press
4thtime button
press
When BOOST is active the indicator lights count down,
showing the duration of the BOOST period remaining.
Model LED - 1 on LED – 1 & 2 on LED – 1, 2 & 3 on
SIR 020 5min to 15min left 16min to 30min left 31min to 60min left
SIR 021 5min to 30min left 31min
SIR 022 5min to 2hour left 2hour 1min to 4hour left 4hour 1min to 6hour left
left 61min to 120min left
to 60min
4
For all three models, LED-1 will flash slowly when 5
minutes of the boost period remains and will flash faster
when 1 minute remains. At the end of the boost period
SIR will automatically switch off the connected
appliance.
The appliance can be switched off by cancelling the
boost period, using any of the following methods:
1. If the BOOST button has just been pressed, wait for
three seconds and then press it again. The indicator
lights should all turn OFF.
2. Press the BOOST button repeatedly, until ALL the
indicator lights have turned OFF.
3. Press and hold in the BOOST button until ALL the
indicator lights have turned OFF.
5
Installation
A means of disconnection from the supply, having at
least 3mm contact separation in both poles, must be
incorporated in the fixed wiring. We recommend a
separate fused circuit from the consumer unit (24-hour
supply) protected by a 15A HRC fuse or, preferably a
16A MCB. In some cases immersion heater failure can
damage the SIR. Installation of a 100mA RCD will
provide additional protection for the unit. If the SIR is to
be connected to a ring main then the spur feeding the
controller should be protected in the same way. The SIR
is NOT suitable for mounting on an unearthed metal
surface.
THE SIR UNIT SHOULD BE KEPT IN ITS SEALED
PACK UNTIL ALL DUST AND DEBRIS HAVE BEEN
C L E A R E D A WAY P R I O R TO M A K I N G
CONNECTIONS.
6
STEP-1 Unpack unit and remove front cover
Take the SIR out of its packaging and then remove the
front cover gently, using a slotted screwdriver in the
notch, as shown in the picture below
7
STEP-2 Preparing SIR for surface wall mounting
SIR is suitable for mounting directly on to any surface
mounted single-gang moulded box having a minimum
depth of 25mm for UK, or 35mm for Continental
Europe. Cable entry can be made through the most
convenient cut-out.
8
Remove cut-outs before fixing the box in place. Where
appropriate, drill the box to provide close-fitting entry for
cables and heat-resistant flexible cables. Take care to
remove sharp edges.
Ensure that the clamp is positioned the right way up.
The projections on the underside of the clamp should
grip the cable in order to secure it firmly. The cable
clamp screws must be adequately tightened, to a
torque setting of 0.4Nm.
For flush wall mounting
The SIR can be mounted directly to any standard
minimum 25mm deep flush mounting single gang
wiring box of UK (BS 4662) or 35mm deep flush wall
box Europe (DIN 49073). See pictures of gang boxes
on page 19.
9
Clamp all surface wiring to the wall adjacent to the SIR,
using trunking where appropriate. The flexible cable to
the appliance should be passed through the cable entry
hole in the bottom edge of the SIR, and secure under
the cable clamp provided.
STEP-3 Making connections
Use twin-and-earth cable with a maximum conductor
size of 2.5mm single conductor for the incoming supply
2
to the SIR.
10
Use a suitably rated three-core flexible cable to connect
the SIR to the appliance to be switched. For appliances
rated up to 2kW use minimum 1.0mm flexible
conductors. For appliances rated up to 3kW use
minimum 1.5mm flexible conductors. Heat resistant
2
2
flexible cable must be used if connecting the SIR to an
immersion heater.
L in Live in
N in
Neutral in
Supply earth terminal
L out Live out to appliance
N out
Neutral out to appliance
Appliance earth terminal
All un-insulated earth conductors must be sleeved
and connected to the earth terminals on the back of
the SIR. The supply earth conductor and appliance
earth conductor must use the separate terminal
connections provided.
11
Switch off the mains supply and then connect the
conductors for the incoming supply and the appliance
on the back of the unit, as shown on the next page.
Phase In
Neutral In
Earth In
Earth Out
Neutral Out
Phase Out
Incoming
Supply
230V AC
To
Appliance
(Max 3kW)
12
STEP-4 Installing SIR on wall gang / flush wall box
Carefully offer the SIR to the moulded/metal box and
secure using two screws.
Take care not to damage the insulation or trap the
conductors when fitting to flush wall box.
13
STEP-5 Fitting front cover and final check
After fitting the mounting screws, fix the front cover
back on. Offer the front cover on to the unit and make
sure that it clicks securely in place.
Finally switch on the mains supply and check that the
SIR switches the appliance on and off correctly.
14
Service and Repair
The SIR is NOT user serviceable. Please do not dismantle the
unit. In the unlikely event of a fault occurring please contact a
heating engineer or a qualified electrician.
15
Technical specifications
Electrical
Purpose of control Electronic timer (independently
mounted)
Contact rating 13A resistive*, 230V AC, suitable
for loads up to 3kW
Control type Micro-disconnection
Supply 230V AC, 50Hz only
Control action Type 2B
Operation time
limitation Intermittent
Software class Class A
Timing accuracy (±5%)
Timer boost period Model SIR 020: 15/30/60 minutes
Model SIR 021: 30 mins/1 hour/2 hours
Model SIR 022: 2/4/6 hours
* optionally 3A inductive
16
Mechanical
Dimensions 85 x 85 x 19mm (flush mount),
85 x 85 x 44mm (surface mount)
Case material Thermoplastic, flame retardant
Ball pressure test
temperature 75°C
Mounting Single-gang surface mount / flush
box, minimum depth 25mm (UK) /
35mm (Continental Europe)
Environmental
Impulse voltage rating Cat II 2500V
Enclosure protection IP 30
Pollution degree Degree 2
Operating temperature
range 0°C to 35°C
Compliance
Design standards EN 60730-2-7, RoHS,
BS EN 60730-1,
BS EN 60720-2-7
17
Ordering information
SIR 020 15 to 60 minute countdown timer with single push-
button operation and LED indicator lights. Suitable for loads up
to 3kW at 230V AC.
SIR 021 30 to 120 minute countdown timer with single pushbutton operation and LED indicator lights. Suitable for loads up
to 3kW at 230V AC.
SIR 022 2 to 6 hour countdown timer with single push-button
operation and LED indicator lights. Suitable for loads up to 3kW
at 230V AC.
All above models are suitable for installation on illustrated types
(see page 19) or any other similar type of wall gang / back
boxes.
18
UK
Metal back box
Continental Europe
Flush wall Flush wall Flush wall Flush wall Flush wall
Single gang
Surface mount
Germany
19
BGX5 0 1 - 8 6 6
Secure Meters (UK) Ltd
Secure House, Lulworth Close,
Chandlers Ford,
Eastleigh, SO53 3TL
United Kingdom
t: +44 1962 840048 f: +44 1962 841046
Secure Meters (Sweden) AB
Repslagaregatan 43
Box 1006, SE-611 32
Nykoping, Sweden
t: +46 155 775 00 f: +46 155 775 97
www.securemeters.com
Part Number BGX501-866 Issue 4
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