Please read the instructions fully before
attempting installation.
IMPORTANT
This unit should be installed to current
IET wiring regulations if in doubt
c
onsult a qualified electrician.
• Timer must not be mounted on a
flammable surface.
• Ensure that the timer does not come
into contact with any combustible
materials such as towels or bedding.
• Ensure at least a 300mm air space
is allowed around the timer.
Installation/ Operating
Instructions for
D
ual Tariff Boost Timer
- T109
INSTALLATION
THIS TIMER SHOULD NOT BE
FITTED ONTO A CONDUCTIVE
SURFACE (I.E METAL)
N
OTE
Use the terminals 1 to 5 as identified.
1. Before you begin to install.
DISCONNECT THE MAINS SUPPLY
2. The Dual Tariff Boost Timer is suitable
for fixed wiring only.
3. The following cable cross sections
are possible:
4. Select the single or twin box fixing
points on the plate.
5. If the timer is to be surface mounted:
select the single or twin fixing points
on the back plate.
6. Wire entry from rear, both sides
possible.
7. Connect main cable as shown in
Dia.5.
8. Select desired flexible cable outlet
to immersion heaters and using pliers
remove the selected slot.
9. Clamp cables using attached cable
clamp.
10. Connect the ‘BOOST’ and the
‘TIMED ON’ as required in Dia.6,7&
8.
11. Assemble the timer to the back
plate by aligning the location pins
o
n the top of the backplate with
the cut outs provided on the clock
body. Lock in position using a fixing
screw.
Dia.1
Dia.2
Dia.3
Box
Box
Dia.4
3 x 2.5mm
2
(2X) output
3 x 4mm
2
(2X) output
Dia.5
Dia.6
Two seperate immersion heaters.
Dia.7
Single immersion heaters.
Dia.8
Dual immersion heaters.
This timer controls the use of cheap
rate electricity during the night to heat
the water in your tank for the following
applications:
B
OOST LOAD
BOOST LOAD
BOOST LOAD
T
IME ON LOAD
TIME ON LOAD
TIME ON LOAD
M
AINS
S
UPPLY
MAINS
SUPPLY
MAINS
SUPPLY
B
OOST
BOOST LOAD
TIME ON LOAD
NEUTRAL
MAINS
SUPPLY
ON/OFF
SWITCH
APPLICATIONS
T109 Ins July 21.qxp_Layout 1 10/09/2021 13:31 Page 1
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