Secure E7 Quartz Installation Instructions
The E7 Quartz is an electro-mechanical water heating control designed to utilize cheap night-rate electricity, ensuring a tank of hot water is available for the morning.
Important: Installation and connection should only be performed by a suitably qualified person in accordance with the current edition of the IET Wiring Regulations.
WARNING: Isolate the mains supply before commencing installation. Ensure the unit is properly earthed.
The E7 Quartz is supplied with its own surface mounting box, which can also be mounted over a single or double gang flush wall box. It must not be mounted on an unearthed metal surface. The fixed wiring must incorporate a means of disconnection from the supply with at least 3mm contact separation in both poles. A separate fused circuit from the consumer unit (24-hour supply) protected by a 15 amp HRC fuse or a 16 amp MCB is recommended. Installation of a 100 mA RCD will provide additional protection for the unit. If the E7 Quartz is connected to a ring main, the spur feeding the controller should be protected similarly.
Mounting
To remove the E7 Quartz from its mounting box, unscrew the 2 captive screws securing the unit.
Conduit Box Mounting
Use holes marked 'A' (Fig. 1) for a single gang box or holes marked 'C' for a double gang box. Cable entry is through the cut-out between the 'A' fixing holes.
Surface Mounting
Use the two holes marked 'B' (Fig. 1). Cable entry is through the most appropriate cut-out.
Connections
Use a three-core cable with a minimum conductor size of 1.0 mm² for a 2 kW heater, or 1.5 mm² for a 3 kW heater to connect the unit to the supply. Connect the incoming wires to the terminal block as follows:
- TERMINAL 1: LIVE in
- TERMINAL 2: NEUTRAL in
- TERMINAL 3: NEUTRAL(s) out to immersion heater(s)
- TERMINAL 4: LIVE out to Boost immersion heater
- TERMINAL 5: LIVE out to Off-Peak immersion heater
Clamp all surface wiring adjacent to the box or use trunking where appropriate. Secure the heat-resistant flexible cords from the immersion heaters using the cable clamp in the box.
Diagram Description (Fig. 1): Shows the rear of the E7 Quartz unit with terminal connections labeled 1 through 5, earth terminals, and mounting holes A, B, and C. It also indicates alternate cable entry points and notes that bare copper earth conductors should be fully sleeved inside the unit.
Diagram Description (Fig. 2): An internal circuit diagram of the Economy 7 Quartz. It illustrates the connections for Boost and Off-Peak time switches, a water heater switch, and the terminal block connections (1-5) for Live In, Neutral In, Neutral Out, Boost Live Out, and Off-Peak Live Out. It also shows the loads for Off-Peak and Boost, and the neutral connection. A note indicates to link terminals 4 & 5 when using a single immersion heater.
Single Element Immersion Heaters
The 3-core flexible cord should be heat-resistant and rated to 85°C. TERMINAL 4 (Boost live output) should be connected to TERMINAL 5 (Off-Peak live output) and to the immersion heater. The Neutral connection goes to TERMINAL 3, and the Earth connection to the EARTH TERMINALS.
Dual Element Immersion Heaters
Elements should be controlled through separate thermostats. Typically, the thermostat for the top short element is set 5-10°C lower than the thermostat for the long Off-Peak element. The 3-core flexible cords should be heat-resistant and rated 85°C. TERMINAL 4 (boost live output) connects to the short element, and TERMINAL 5 (Off-Peak live output) to the long element. Neutral connections go to TERMINAL 3, and Earth connections to the EARTH TERMINALS.
Twin Immersion Heaters
The thermostat for the top immersion element should be set lower than the thermostat for the bottom immersion heater. The 3-core flexible cords should be heat-resistant and rated 85°C. TERMINAL 4 (boost live output) connects to the top immersion heater, and TERMINAL 5 (off-peak live output) to the bottom immersion heater. The two Neutral connections go to TERMINAL 3, and the Earth connections to the EARTH TERMINALS.
Ensure all terminal screws, including earth terminals, are securely tightened to a minimum torque of 0.75 Nm upon completion of wiring.
Adjusting The Off-Peak Time Period
After removing the unit and fixing screws, check the Off-Peak time period. Off-peak switching times are available from the Regional Electricity Company. If adjustment is necessary, follow these steps:
- Ensure the timeswitch is not connected to the mains supply.
- The adjustable dial allows ON and OFF time cams to be set between 11:30 PM and 9:00 AM in 15-minute steps. Cams can be set for a minimum of 4.5 hours to a maximum of 7 hours.
- Cams are pre-set during production. If a different time setting is required, adjust the cams from the back of the front cover before installation.
- Rotate the dial to reveal the Orange ON cam. Insert a screwdriver into the slot and press the cam away from the underside of the dial. The Blue OFF cam may need repositioning before the ON cam can be set due to stops.
- Slide the cam clockwise or anti-clockwise on the dial to the desired time. The position can be observed through the clear panel on the dial face. Removing the screwdriver locks the cam.
- Both Blue and Orange cams are set using a similar operation.
Diagram Description: Illustrates using a screwdriver to adjust the timer cams on the back of the front cover. Arrows indicate the direction of movement for releasing and positioning the cams.
Completing The Installation
To assemble the controller to its mounting box, push connectors 1-5 into the corresponding terminals as shown in Fig. 1.
Carefully align the controller with the box and secure it with the fixing screws, ensuring no wiring is damaged. Switch on the mains supply and set the rocker switch to the 'TIMED' position. The battery requires up to 15 minutes to charge before the clock will rotate.
Questions and Answers
| Issue | Solution |
|---|---|
| On installation the clock does not rotate | The battery requires charging before the clock will rotate; this can take up to 15 minutes. |
| How do I know if it is still under warranty? | The E7 Quartz comes with a 2-year guarantee from the date of manufacture, indicated on the rear of the unit (month/year). The E7 Quartz must only be removed from its backbox by a qualified electrician. |
| How long will the battery back-up last on E7 Quartz? | The battery will keep the clock rotating for 150 hours and will be recharged when the mains power supply is restored. |
Specification
- 13A 230V AC 50 Hz
- Electro-Mechanical
- Suitable for immersion heaters up to 3 kW
- Live Parts: Enclosed
- Dirt protection: Normal situation
- Moisture protection: Ordinary
- Operating Temperature: 0-35°C
- Shock protection: Class 1
- Contacts: Micro-disconnection
- Battery reserve: 150 Hours
- Size: 170mm x 115mm x 56mm (excluding rocker switch)
Manufacturer Information
Secure Meters (UK) Ltd
Secure House, Lulworth Close,
Chandlers Ford,
Eastleigh, SO53 3TL, UK
t: +44 1962 840048 f: +44 1962 841046
www.securemeters.com
