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
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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.
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