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Manual Horstmann Electronic 7 Thermostat

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Manual

CONNECTIONS

Use a three-core cable with a minimum conductor size of 1.0mm

for a 2kW heater, or 1.5mm

for a

3kW 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) outtoimmersionheater(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.

SINGLE ELEMENT IMMERSION HEATERS

The 3 core flexible cord should be heat-resistant and rated to 85

TERMINAL 4 (Boost live output) should be connected to TERMINAL 5(Off-Peak live output) and to the

immersion heater.

The Neutral connection should go to TERMINAL3 and the Earth connection to the EARTH TERMINALS.

DUAL ELEMENT IMMERSION HEATERS

The elements should be controlled through separate thermostats. In practice the thermostat for the

top short element is usually set

5-10

Cless than the thermostat for the long Off-Peak element.

The 3 core flexible cords should be heat-resistant and rated

TERMINAL 4 (boost live output) should be connected to the short element and TERMINAL 5(Off-Peak

live output) to the long element.

The Neutral connections should go to TERMINAL 3and the Earth connection 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

C.TERMINAL 4(boost live output)

should be connected to the top immersion heater and TERMINAL 5(off-peak live output)to the bottom

immersion heater. The two Neutral connections should go to TERMINAL 3and the Earth connections to

the EARTH TERMINALS

COMMISSIONING INSTRUCTIONS

SETTING THE CONTROLLER

A feature of this controller is that it allows the time of day and Off-Peak switching times to be set

before the unit is finally installed and powered up.

COMMISSIONING SWITCH

The commissioning switch which is on the back of the unit must now be set to achieve correct

operation of the controller and battery reserve. The display will remain blank with the switch in the

OFF position.

RESETTING THE ELECTRONIC 7

Before installing the off-peak heating periods it is important to reset the unit, this is achieved by

simultaneously pressing the Boost, Summer/Winter, HrsandMins buttons together. The Boost

selection switch must be in the Manual Boost Position.

Electronic equipment can sometimes be affected by sudden changes of atmosphere, this can result in

Display being fogged or Reset function failure. If this happens leave the unit switched on for 15

minutes and repeat the RESET function.

BOOST

SUMMER/

WINTER

HRS MINS

MANUAL BOOST

TIMED BOOST

BOOST SELECTION

SWITCHPOSITION - GMT or GMT/BST

It is essential that the correct commissioning switch position is selected. Incorrect setting of the

commissioning switch may result in inefficient use of the available Off-Peak supply.

GMT ONLY- Switching will always take place at GMTtimes (summer and winter).

GMT/BST- Switching time will be changed by one hour, when the user presses

SUMMER/WINTERbutton on the face of the unit. In the GMT/BSTmode the clock display will match

the actual switching time.

If connection is to be made where a 2-Rate electricity meter is controlled by a Radio Teleswitch or

other equipment, which control tariffs remotely or seasonally, it is essential that before setting the

commissioning switch you find out how the off-peak times are controlled.

The Customer Service Centre of your Electricity Supplier will confirm information regarding Off-Peak

electricity timing and the switching method used for your area. (see below)

GMT ONLY- Set the switch in the GMT position, switching will always take place at GMT

times (summer and winter).

GMT/BST- Set the commissioning switch in the GMT/BST position. Switching time will be

changed by one hour, when the user presses SUMMER/WINTERbutton on the face of the unit. In the

GMT/BSTmode the clock display will match the actual switching time.

On installations where the 2-Rate electricity meter is controlled by a mechanical Tariff Timeswitch the

commissioning switch should be set to GMT ONLY.

PAGE 2 PAGE 3

When wiring is complete ensure that all terminal screws,

including the earth terminal screws are securely tightened

to achieve a minimum torque of .75Nm.

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Join the conversation about this product

Here you can share what you think about the Horstmann Electronic 7 Thermostat. If you have a question, first carefully read the manual. Requesting a manual can be done by using our contact form.

Ness L 10-07-2020
Hi, my Horstman boiler was working up until a power cut. After power cut, time was reset and boiler runs during off peak hours eg 2-7am. I’ve checked and confirm this. What I don’t understand is why the water is not hot at all if the boiler is functioning, what can be the reason for not hot water? In the morning the boiler feels warm to touch. Any advice would be greatly appreciated.

reply | This was helpful (0)

More about this manual

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Specifications

Brand	Horstmann
Model	Electronic 7
Category	Thermostats
File type	PDF
File size	0.1 MB

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Frequently Asked Questions about Horstmann Electronic 7 Thermostat

Our support team searches for useful product information and answers to frequently asked questions. If you find an inaccuracy in our frequently asked questions, please let us know by using our contact form.

What is the dead zone of a thermostat? Verified

Many modern thermostats have a dead zone. If the temperature deviates less than 4°C from the set temperature, the system will not heat or cool. This so called dead zone of the thermostat prevents the system from turning on and off too often, saving energy.

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What is the best place to mount a thermostat? Verified

The best place for a thermostat is approximately 1,5 meter above the ground. Never place the thermostat nead a radiator or other heat emitting equipment or in direct sunlight. Choose a room that is used often. In most cases this is the living room.

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