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ESCTDEB
Electronic Dual
Cylinder Thermostat
Installation Instructions
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Thank you for choosing ESi Controls.
All our products are tested in the UK so we are
confident this product will reach you in perfect
condition and give you many years of service.
However, for additional peace of mind, we
recommend you register your product online at
www.esicontrols.co.uk/warranty for your
extended warranty.
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Installation Instructions
Technical Data 6
Installation Instructions 7
General Safety Instructions 7
Maintenance 7
Safety Notice 8
Fitting the Cylinder Thermostat 8
Boiler Setting 8
Adjusting and Resetting the Cylinder Thermostat 9
Adjusting the 1 Hour Boost 9
Wiring Examples 10
Wiring Diagram 12
Contents
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Installation Instructions
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Electronic Dual Thermostat
Power Supply 230 VAC 50-60Hz
Switch Action SPDT (control), SPST (limit) 230
VAC 6(1)A
Temperature Setting Range 25°C to 65°C
Automated “Boost” As per user setting (see page 9)
Limit Thermostat 80°C with concealed manual reset
Tolerance <1°C
Switching Differential 2°C
Protection Rating IP30
Dimensions L: 110mm x H: 92mm x W: 48mm
(excluding flanges)
Complies with EMC (89/336 & 92/32 EEC) BS EN
60730-1: 2000, BS EN 60730-2-9:
2002. LVD (73/23/ EEC) (93/68/
EEC) BS EN 60730-1:2000, BS EN
60730-2-9:2002
Technical data
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The unit must be installed by a suitably qualified person in
accordance with the latest IEE Wiring Regulations.
N.B. Isolate mains supply before commencing installation.
Please read all instructions before proceeding.
Ensure that the fixed wiring connections to the mains supply
is via a fuse rated at not more than 6 amps and class ‘A’
switch having a contact separation of a minimum of 3mm
in all poles. The recommended cable sizes are 1.0mm sqr or
1.5mm sqr. No earth connection is required as the product is
double insulated but ensure continuity of earth throughout
the system.
General Safety Instructions
Only use this product for control of domestic hot water. Do
not restrict safety valve outlets.
WARNING!
Take great care to avoid scalding if you do not have a
thermostatic mixing valve fitted, during the weekly one
hour disinfection “boost” the hot water temperature will be
over 60°C.
Maintenance
Always isolate the mains supply before commencing any
work, servicing or maintenance on the system. And please
read all instructions before proceeding.
Installation Safety Instructions
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Arrange for an annual maintenance and inspection schedule
to be carried out by a competent person on every part of the
heating and hot water system.
Safety Notice
WARNING!
Always isolate the AC mains supply before installing.
this product must be fitted by a qualified person, and
installation must comply with the guidance provided in
the current editions of BS767 (IEE wiring regulations)
and part “P” of the building regulations.
Fitting the Cylinder Thermostat
1. Slacken the three fixing screws, and insert both sensors
fully into the pocket.
2. Position the thermostat onto the pocket.
3. Tighten the three screws to secure the thermostat, take
care not to over tighten.
4. Complete the wiring connections.
N.B. As a safety feature, when first connected the Electronic
Dual Cylinder Thermostat will call for heat until the
hot water cylinder has reached 61°C and held that
temperature for one hour. During this time there will be
a live output to the DHW zone valve and therefore to the
boiler and the pump.
Boiler Setting
To ensure the elimination of Legionella Bacteria in the Hot
Water Cylinder, at least once a week the Cylinder should
be heated to 61°C. This is carried out automatically by the
ESCTDEB. The Boiler Thermostat (output temperature)
must therefore be set to maximum and homeowners
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should be made aware that once a week the hot
water will be warmer following the automatic “weekly
boost”. We also therefore strongly recommend the use of a
thermostatic mixing valve (TMV), these blend hot water with
cold water to ensure constant safe shower and bath outlet
temperatures, preventing scalding.
Adjusting and Resetting the Cylinder Thermostat
Adjust the dial to show the desired hot water temperature on
the display, between 25°C to 65°C. The lower the temperature,
the less chance of scalding and the more energy saving. Most
homeowners find a temperature between 48°C-53°C to be
adequate. If the system should overheat, the cause must be
determined and resolved by a suitably qualified person. In the
event of an overheat, the thermostat cuts out automatically.
The reset for the thermostat is under the adjustment dial.
Adjusting the 1 Hour Boost
The ESCTDEB has user defined settings where the duration
of the Legionella Override can be adjusted from 1 to 7 days
or completely disabled to operate as a conventional Dual
Cylinder Thermostat.
1. To disable/adjust the legionella boost turn the unit off
by pressing and holding down the HOLIDAY button
until an audible click is heard and the red LED turns off.
2. Release the button and after approx. 10 seconds press
and hold the HOLIDAY button again. After 5 seconds
the red LED will light up and an audible click is heard,
keep the HOLIDAY button pressed for a further 5
seconds until the LCD display flashes.
3. Release the button and use the HOLIDAY button to
choose between disabling the override (OF) or setting
the delay between the overrides from 1 – 7 days.
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4. Once selected, release the button and the unit will return
to the user set position within 5 seconds.
5. Press and hold the HOLIDAY button for a further 5
seconds to confirm your selection.
Wiring Example: S Plan
Fused Main
Supply
PROGRAMMER
ZONE VALVE HWS
CYLINDER STAT
HWS
1
1
1
N
N
2
2
2
L
L
3
3
3
HW-ON
CH2-ON CH1-ON HW-ON L N
COM
S/L
5
5
5
HWS
N/O
4
4
4
HWS
N/C
E
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Fused Main
Supply
WEATHER
COMPENSATOR
PROGRAMMER
ZONE VALVE HWS
CYLINDER STAT
HWS
1
1
1
N
N
2
2
2
L
L
3
3
3
HW-ON
CH2-ON CH1-ON HW-ON L N
COM
S/L
5
5
5
HWS
N/O
4
4
4
HWS
N/C
E
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Wiring Example: S Plan with Weather Compensator
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Fused Main
Supply
PROGRAMMER
3 PORT MID POSITION
CYLINDER STAT
GREY ORANGE WHITE BLUE
GREEN/
YELLOW
1
1
N
2
2
L
3
3
HW-ON
CH2-ON CH1-ON HW-ON L N
COM
5
5
HWS
N/O
4
4
HWS
N/C
Wiring Example: Y Plan
Wiring Diagram
6mm MAX
1.0-2.5mm
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This product requires a fused permanent Live and Neutral
supply.
As shown in the wiring examples, the NC (normally closed)
terminal is only used in Y Plan systems with a Mid Position
3 Port Zone Valve, or when the installation is using Weather
Compensation.
N L Common Hot Water
ON (N/O)
Hot Water
OFF (N/C)
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We are continuously developing our products to
bring you the very latest in energy saving technology
and simplicity. However, should you have any questions
setting up your controls please email us at
sales@esicontrols.co.uk or for technical queries call
us on our dedicated technical helpline 07539 117468.
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WARNING: Interference with sealed parts renders the
guarantee void.
In the interests of continuous product improvement we reserve
the right to alter designs, specifications and materials without
prior notice and cannot accept liability for errors.
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Version 5.5
© ESi Controls Limited 2017
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