Safety Instructions �������������������������������������������������������������3
What is a programmer? �����������������������������������������������������4
General installation instructions ����������������������������������������� 5
Specications ��������������������������������������������������������������������5
• Installation must be carried out by a qualied electrician and conformed to current IEE Regulations!
• Mains supply must be suitably fused (usually 3 amps) and provision made for Class A circuit
disconnection�
• Control is suitable for xed wiring only�
• If the unit is to be surface wired:
– Remove backplate by slackening xing screw and separating plate and timeswitch�
– Remove the knock out from the backplate and the timeswitch�
– Screw backplate to wall with counter sunk number 8� (Wood screws using xing holes provided�)
• For switch mounting:
– Use the centre two holes and x backplate to box using machine screws�
– To ensure clearence for the down ap, ensure that there is a minimum of 4 cm clearance under the
unit when mounted�
Connection and mounting must be performed by a professional electrician!
EN
3
Page 4
What is a programmer?
Programmers allow you to set ’On’ and ’Off’ time periods� Some models switch the central heating and
domestic hot water on and off at the same time, while others allow the domestic hot water and heating
to come on and go off at different times�
Set the ’On’ and ’Off’ time periods to suit your own lifestyle� On some programmers you must also set
whether you want the heating and hot water to run continuously, run under the chosen ’On’ and ’Off’
heating periods, or be permanently off�
The time on the programmer must be correct� Some types have to be adjusted in spring and autumn at
the changes between Greenwich Mean Time and British Summer Time�
You may be able to temporarily adjust the heating programme, for example, ’Override’, ’Advance’ or
’Boost’� These are explained in the manufacturer`s instructions�
The heating will not work if the room thermostat has switched the heating off� And, if you have a hot
water cylinder, the water heating will not work if the cylinder thermostat detects that the hot water has
reached the correct temperature�
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Page 5
General installation instructions
Backplate
Fixing
Screw
Terminal
Block
Earth
Terminal
N
L 1 2 3 4
Fixing
Holes
Cable
Knockout
The TOWERCHRON QM1 and QM2 are both
double insulated so earth protection is not
required� However in the backplate a terminal for
earth continuity is provided which should be used
if earth conductors are present in your cable�
Make sure that the earth conductors are sleeved
to prevent accidental contact with live parts�
GBEN
Specications
Installationdouble insulated
Rating5 amps (2 amps) at 240
Fittingsurface mounted or to a
Dimensions156 x 85 x 42
Maximum ambient
temperature
Type 1 action
Micro disconnection
Pollution protection Normal pollution situation
volts 50 hertz
single gang plaster depth
socket outlet
50° centigrade
Type 1B
5
Page 6
“TOWERCHRON QM1”
OFF
ON
6
Applications (QM1)
• Any simple time switching application
TIMED
OFF
CONST.
up to the stated rating�
• Domestic heating system where both
heating and hot water services are
required to switch ON and OFF at the
same time�
• Controlling a “combi” or “combination
boiler”�
Page 7
Programming your “TOWERCHRON QM1”
Setting time of day
Rotate the minute hand of the clock until the arrowhead in clock
face aligns with the correct time on the outer dial, i�e� 8 = 8�00 a�m�,
14 = 2�00 p�m�
Setting ON/OFF times
Move all tappets between ON and OFF times required to outer
position� The minimum switching time is 15 minutes�
Set any other ON/OFF periods in a similar manner
Slide switches (under drop down cover)
Pull top edge of drop down cover to gain access to slide switch�
The slide switch provide following functions:
– OFF service off completely
– TIMED service comes on between ON and OFF periods as set
on tappets on clock face
– CONST� service is on continuously
EN
OFF
TIMED
OFF
ON
OFFON
CONST.
7
Page 8
Internal wiring diagram (QM1)
=
~
N
L
1234
OFFON
• Carry out wiring installation using appropriate diagram as shown�
• When the TOWERCHRON QM1 timeswitch is to be used with a combination boiler, always refer to the
boiler manufacturers instructions concerning electrical wiring before using the information contained
in this leaet� In some cases the boilers manufacturers instructions will contain information regarding
removal of certain link wires and will always indicate the fuse rating for the mains electrical supply�
• Plug in unit and secure to the base by tightening xing screw�
8
Page 9
Wiring installation instruction (QM1)
Simple circuit for for domestic central heating
boiler with gravity fed hot water supply
220/240V
50 Hz AC
main supply
NL
1234
boilerpump
neutral
room stat
DS
D = demand
S = satisfy
neutral
This diagram is correct for mains operated
systems� The link wire L-3 must be tted by the
installer�
TOWERCHRON QM1 is ideally suited for controlling combination boilers� The following basic circuit
diagrams apply for the range indicated�
It is important that you always refer to
the Boiler Manufacturers Instructions
concerning electrical wiring before using
the information contained in this leaet�
In some cases the Boiler Manufacturers
Instructions will contain information
220-240V AC
50 Hz
FUSED
SUPPLY
regarding removal of certain link wires
and will always indicate the fuse rating
for the main electrical supply�
Always use special 24V thermostat supplied with this boiler, and wire as indicated in boiler instructions
substituting time switch terminals A and B for terminals 3 and 4 respectively on QM1�
Elm Leblanc GVM 420Boiler with timeswitch and room thermostat
220/240V
50 Hz AC
main supply
room stat
N
COM�
D
D = demand
S = satisfy
COM = common
boiler terminals
1L234
S
frost protection
thermostat (if required)
240V
3 AMP
fused
supply
L
boiler connection box
12
timeswitch
ENLBA
J
1
N
E
342
6
5
ground
240V 3 AMP
fused supply
thermostat
CKDH
N
L
Page 13
“TOWERCHRON QM2”
OFF
ON
CH
TIMED
OFF
OFF
HW
CONST.
CH
HW
CONST.
TIMED
• Fully pumped central heating systems
using mid position valves, spring
return valves or “power open”,
“power closed” valves�
• Gravity hot water, pumped heating
systems with or without motorised
valves tted into the domestic hot
water primary circuit�
• Unit, as supplied is suitable for
gravity hot water systems� For use on
pumped primary systems, separate
the backplate from the unit by
slackening the securing screw and
remove the red pin in the back of the
programmers chassis�
Applications (QM2)
EN
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Page 14
Programming your “TOWERCHRON QM2”
OFF
CH
TIMED
CONST.
Setting time of day
Rotate the minute hand of the clock until the arrowhead in clock
face aligns with the correct time on the outer dial, i�e� 8 = 8�00 a�m�,
14 = 2�00 p�m�
Setting ON/OFF times
Move all tappets between ON and OFF times required to outer
position� The minimum switching time is 15 minutes�
Set any other ON/OFF periods in a similar manner
Slide switches (under drop down cover)
Pull top edge of drop down cover to gain access to slide switches�
Two switches are provided, one for heating, the other for hot water�
Depending on system installed, each switch provides following
functions:
– OFF service off completely
– TIMED service comes on between ON and OFF periods as set
on tappets on clock face
– CONST� service is on continuously
14
OFF
OFF
TIMED
TIMED
OFF
ON
OFFON
CONST.
CH
HW
CONST.
Page 15
Internal wiring diagram (QM2)
NL
220/240V
AC 50 Hz
fused 3A
1234
HW
OFFCHOFFHWONCHON
• Carry out wiring installation using appropriate diagram
as shown�
• Plug in unit and secure to the base by tightening xing
screw�
EN
15
Page 16
Wiring installation instruction (QM2)
Gravity Hot Water / Pumped Heating - System with Room Stat to Control Pump
• With the above system, the following
combination can not be selected on the slide
switches:
– Heating TIMED, hot water off
– Heating CONST, hot water off
– Heating CONST, hot water timed
• Fully pumped systems
– Remove red pin (see applications
TOWERCHRON QM2)
EARTH
NEUTRAL
LINE
BOILER
SWITCHED LIVE
REFER TO BOILER
MANUFACTURER
INSTRUCTIONS
TOWERCHRON QM2
N L 1 2 3 4
N
N
ROOMSTAT
EARTH
NEUTRAL
COMMON
DEMAND
PUMP
EARTH
NEUTRAL
LINE
The following wiring diagrams are schematic only (for clarity the earth and neutral connections are
omitted)� We suggest when wiring systems a suitable wiring centre is used (the Tower Controls wiring
centre is purpose made and gives full information for wiring this programmer into systems using
compatible equipment)�
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Page 17
Gravity Hot Water / Pumped Heating System - Two Port Valve in D�H�W� with Room and
Cylinder Stats
Note: Only valves with “change over“ end switches are suitable�
TOWERCHRON QM2
N L 1 2 3 4
EARTH
NEUTRAL
LINE
CYLINDER STAT
EARTH
COMMON
DEMAND
VALVE
GREEN/YELLOW
BLUE
BROWN
GREY
WHITE
ORANGE
N
ROOMSTAT
EARTH
NEUTRAL
N
COMMON
DEMAND
PUMP
EARTH
N
NEUTRAL
LINE
BOILER
SWITCHED LIVE
REFER TO BOILER
MANUFACTURER
EN
17
Page 18
Fully Pumped System using 2 Port Spring
Return
Fully Pumped System using 3 Port
Mid-Position Valve
220-240V
50HZ
main fused
3 AMP
EARTH
NEUTRAL
LINE
HEATING VALVE
GREEN/YELLOW
BLUE
BROWN
WHITE or GREY
BLACK or ORANGE
HOT WATER VALVE
GREEN/YELLOW
BLUE
BROWN
WHITE or GREY
BLACK or ORANGE
18
TOWERCHRON QM2
E
N
N
N
L 1 2 3 4
ROOMSTAT
EARTH
NEUTRAL
N
COMMON
DEMAND
CYLINDERSTAT
EARTH
COMMON
SATISFIED
DEMAND
PUMP
LINE
N
NEUTRAL
EARTH
BOILER
SWITCHED LIVE
REFER TO BOILER
MANUFACTURER
INSTRUCTIONS
TOWERCHRON QM2
220-240V
50HZ
main fused
3 AMP
EARTH
NEUTRAL
LINE
MID-POSITION VALVE *
GREEN/YELLOW
BLUE
WHITE or BROWN
GREY
ORANGE
BOILER
SWITCHED LIVE
REFER TO BOILER
MANUFACTURER
INSTRUCTIONS
* TOWER MP322C
ACL 697B340
DRAYTON FLOW SHARE 2
E
N
N
L 1 2 3 4
ROOMSTAT
EARTH
NEUTRAL
N
COMMON
DEMAND
CYLINDERSTAT
EARTH
COMMON
SATISFIED
DEMAND
PUMP
LINE
N
NEUTRAL
EARTH
HONEYWELL V4073A
LANDIS & GYR SK 3L
SUN VIC SD 1701
Page 19
Conversion Chart for different Room / Cylinder Thermostats