MS E818/F User manual

Issue 1.2
Product Guide
E818/F
today, tomorrow and in the future
mselectronics.co.uk
Set-Back Robust Thermostat
with Remote Control Input
with Frost Temperature Range

Product Overview
The E818/F offers a high quality and robust solution to tamperproof energy saving thermostatic control. It
utilises a high-accuracy radiant heat sensor in conjunction with its die-cast aluminium case and tamperproof
screws to ensure vandal-resistant, yet accurate tamperproof energy control.
The E818/F is a standard set-back thermostat with a set-point between -2°C and +12°C, combined with an
adjustable temperature hysteresis (differential) of anything between 0.25°C and 5°C and a set-back of up
to 14°C. The thermostat regulates to one of two preset temperatures which can be chosen between by the
end-user using a remotely located toggle switch/latching pushbutton, providing greater temperature control
to the end-user while helping to reduce overall heating energy consumption. For clarity, two LEDs on the
unit indicate which temperature set-point has been selected.
The E818/F can also be controlled remotely by any device that can provide a voltage-free latching contact
such as a time-clock, PIR presence detector or BMS relay for example. This eliminates the user interface
for switching between the high and low modes, providing an effective solution to heating areas that are
infrequently occupied.
Product Wiring
1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.
2. Power to the thermostat is provided via the Live and Neutral input terminals labelled “L” and “N” (230V
AC, 50Hz). This supply should be suitably fused (recommended: 1A slow blow).
3. NOTE: This thermostat MUST be earthed using the earth terminal provided.
4. A voltage-free changeover relay output capable of switching loads of up to 10A, 250V AC (resistive) is
provided by the thermostat.
5. The Common “COM” terminal is connected to the Normally Open “N/O” terminal when the sensed room
temperature is above the “Setpoint” temperature.
6. Conversely, it is connected to the Normally Closed “N/C” terminal when the room temperature is sensed
to be below the “Setpoint”.
7. The temperature sensor is factory tted to all models with the exception of the Remote Sensor versions.
The 2-core screened cable connection should be made to the “Temp. Sensor” terminals in this case.
Figure 1 Typical wiring example
2Issue 1.2

Installation
1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.
2. Unscrew the 4 security screws using MS Electronics tamperproof screwdriver MSD-152 to remove the
front cover.
3. Mount the unit securely using any suitable xing in conjunction with the mounting holes provided in the
unit. For optimal results, position the temperature sensor out of direct sunlight and well away from any
heating/cooling sources.
4. Connect the wiring as shown in the diagram (or any suitably appropriate form) using the convenient
pluggable terminal blocks provided. Make sure to choose the correct output terminals that are suitable
to your application.
5. On the remote sensor version, 2-core screened cable should be used to connect the remote sensor to
the thermostat. The screen should be connected to the earth terminal ONLY (do not connect the screen
to anything at the remote sensor end).
6. Adjust the internal controls to suit the operational requirements (see below).
7. Replace the cover securely using the 4 security screws
Operation
1. IMPORTANT: ensure all electrical connections are isolated before commencing any work on the unit.
2. Adjust the “Setpoint” dial to the temperature the room is to be regulated at (typically 8ºC).
3. Set the “Differential” to the total temperature swing either side of the “Setpoint” that the room
temperature is required to keep within (typically 1°C).
4. Adjust the “Set-Back” to the temperature below the HIGH “Setpoint” to obtain the desired temperature in
LOW mode.
5. Example of a standard set-up:
HIGH mode (RED LED)
“Setpoint” set to 8ºC and “Differential” set to 1ºC
The unit will maintain the temperature between 7.5ºC and 8.5ºC
LOW mode (GREEN LED)
“Setpoint” set to 20ºC, “Differential” set to 1ºC and “Set-Back” set to 5 ºC
The unit will maintain the temperature between 2.5ºC and 13.5ºC
3Issue 1.2
Technical Specication
Power supply: 220V - 240V AC 50Hz (live/neutral/earth)
22V - 26V AC or DC [/24V variant only]
Output switch rating: 10A, 250V AC 50Hz (resistive)
Output switch type: Changeover relay (volt-free)
Temperature control: [high setpoint]: -2°C to +12°C
[low setpoint]: 0°C to 14°C below the high setpoint
Temperature differential: 0.25°C to 5°C
Sensor drift: 0.15°C over 5 years
Guarantee: 5 Years
Weight: 0.31Kg
Dimensions mm: 120mm x 95mm x 35mm
Product Accessories
MSD-152 MS Electronics tamperproof screwdriver
MSD-150 Air temperature sensor (sensor only)
MSD-224 Air temperature sensor (internal, boxed)
MSD-370 Air temperature sensor (internal, faceplate)

Technical Support
For further help or information on this and the other products in the MS Electronics range
visit www.mselectronics.co.uk or call 0333 666 1176.
Alternatively, email techsupport@mselectronics.co.uk
Additional copies of this product guide can be downloaded from our website.
Product Warranty
MS Electronics guarantees all their products against manufacturing defects for
5 years from the purchase date. If your product is found to be faulty, MS Electronics will,
at their discretion, repair or replace the product free of charge.
Note
Any modification or damage to the outer casing of the thermostat, as well as any
damage to the product due to abuse or incorrect wiring may invalidate the guarantee.
e: info@mselectronics.co.uk
t: 0333 666 1176 f: 0333 666 1436
mselectronics.co.uk
follow us on twitter @mselec
MS Electronics reserves the right to alter or change this specification without prior notice.
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