SECURE SIR 020/021/022 Countdown Timer Instruction Manual

SIR 020 / SIR 021 / SIR 022
Countdown Timer

Installation and User Instructions

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.

The LEDs become operational when the unit is powered up.

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).

Model| 1st-time   button
press| 2nd-time   button
press| 3 rd time button
press| 4th-time button
press
---|---|---|---|---
SIR 020| 15 min| 30 min| 60 min| off
SIR 021| ½ hour| 1 hour| 2 hour| off
SIR 022| 2 hour| 4 hour| 6 hour| off

When BOOST is active the indicator lights count down, showing the duration of the BOOST period remaining.

left

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 canceling 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.

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 W A Y P R I O R T O M A K I N GCONNECTIONS.

STEP-1 Unpack unit and remove the 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

STEP-2 Preparing SIR for surface wall mounting

SIR is suitable for mounting directly onto any surface mounted single-gang molded 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.

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 toremove 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.

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 a twin-and-earth cable with a maximum conductor size of 2.5mm single conductor for the incoming supply to the SIR.

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 a minimum of 1.0mm flexible conductors. For appliances rated up to 3kW use 2 minimum 1.5mm flexible conductors. The heat-resistant flexible cable must be used if connecting the SIR to an immersion heater.

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.
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.

STEP-4 Installing SIR on wall gang / flush wall box

Carefully offer the SIR to the molded/metal box and secure using two screws.
Take care not to damage the insulation or trap the conductors when fitting to flush wall box.

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.

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.

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

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
Single-gang surface mount / flush| 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

Ordering information

SIR 020 15 to 60-minute countdown timer with the single pushbutton operation and LED indicator lights. Suitable for loads up

to 3kW at 230V AC.
SIR 021 30 to 120-minute countdown timer with the 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 the above models are suitable for installation on illustrated types (see page 19) or any other similar type of wall gang/ack
boxes.

UK

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

References

• Secure Meters

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