t.a.c. Satchwell SVT User manual

Satchwell TM
Satchwell
Data Sheets
Controllers
DS 2.021 - CSC
Multi-Lingual Instructions
MLI 2.001 - Mounting Details
7-DAY OPTIMISER
The SVT is a fuel-saving controller which can replace a conventional
time switch on a heating system and provides a variable start time
dependent on the fall of room temperature during the off period.
It is used to switch on and off central heating systems and will
substantially reduce fuel consumption compared with fixed time
starting.Inallbuttheverycoldestweatherthe start timeisdelayed until
the latest time consistent with the amount of heat necessary to regain
the required temperature at occupancy time. In very mild weather this
delay can be as much as five hours later than in cold weather and fuel
savings of between 10% and 25% are possible.
By relating the start time to the inside temperature rather than the
outside temperature, the insulation and thermal mass of the building
are taken into account.
The SVT makes the benefits of optimum start control available for
small buildings because the capital outlay for the installation is low and
no skilled personnel are needed to operate it.
FEATURES
•Easy installation - only one sensor required (packed with the
controller)
•Programme override switch
•Choice of day control by separate compensator or built-in
on/off day control
•Minimum night 'inside' temperature
•Analogue and Digital clock versions available
SVT

2
SPECIFICATION
ADJUSTMENTS OR SETTINGS
Time Switch: Up to 8 ON/OFF programmes per day.
Design Preheat Time: Marked 'DPH'.
Scaled 1 to 5 hours, adjustable to within hour. This sets the maximum
delay time - the difference between Time Switch 'On' time and
occupancy time. Position 'T' is the fast run position.
Day Temperature: Marked Td.
Scaled 15 to 25°C.
This sets the room temperature to be reached at occupancy time (it is
not a daytime controller unless slide switch 'S' is in position 'B').
Night Temperature: Marked Tn.
Scaled 5 to 15°C.
This sets the minimum room temperature permissible during
unoccupied periods. It provides frost or anti-condensation protection
by cycling the heating system on and off to maintain this level, should
the inside temperature fall as low as this setting.
On/Off Day Control:
This is selected by slide switch 'S' (see Fig.16). In position 'A' the SVT
operatesaseparate day controller. In position 'B' the SVT provides day
control from its own room sensor (STR614) using relay R2.
Programme Override Switch
INDICATION
Two LEDs illuminate:
Type:
SVT 4201 - Analogue Clock - Specification no. 588-4-201
SVT 4251 - Digital Clock - Specification no. 588-4-251
Associated Sensor:
STR614 (included with controller).
Power Supply:
230V 50/60 Hz
Consumption:
Analogue - 12 VA
Digital - 14 VA
OUTPUT RELAYS
Note: Observe Wiring Precautions on Page 8.
Plant Switching Relay:
Voltage free single pole make/break contact, rated 250V 2A
(1A inductive)
Day Control Relay R2:
Voltage free single pole changeover contact, rated 250V 2A
(1A inductive).
Note: (These contacts are not suitable for switching less than 10mA
at 5V).
Fuse:
Analogue - Transformer secondary: 250mA
Digital - Transformer secondary: 315mA (20mm)
Spare fuse provided.
Power Failure Reserve:
Digital - Capacitor - For clock (when fully charged): - 100 hours.
Analogue - 100 hours
There is also a 2 hour battery to cover a short power interruption to the
electronics during the preheat period.
Ambient Temperature Limits:
Operating:0 to 40°C SVT 4201. Storage & Transit: 0 to 55°C
0 to 50°C SVT 4251.
Max. Ambient Humidity:
95%rh non-condensing
CONSTRUCTION
DIN Standard 144 x 144mm square for wall or flush panel mounting
(cut-out size 138 x 138mm).
Case: 2-piece polycarbonate or ABS moulding. Fire Resistant.
Protection Class IP 41.
Window: Transparent polycarbonate moulding through which all
adjustments and settings can be seen.
Access to settings requires removal of window by a special tool
provided, to prevent unauthorised tampering. Manual override
switches accessible through window.
Conduit Entries: Six 21mm cutouts in top and bottom rim of rear case
moulding.
Terminals:
Low Voltage: Accept 2 x 1.5mm² cables.
Mains Voltage: Accept 2 x 1.5mm² cables or 1 x 2.5mm² cable.
(Separate block from low voltage).
Rear printed circuit board carries terminals, power supply and output
relays. It is reversible for convenience when controller is flush panel
mounted, in which case it is detached from rear moulding of case and
mounted in front part of case.
Accessory: Flush mounting brackets are packed with the controller.
These are not used when controller is wall or rear panel mounted.
Conduit plate for use with MICC cable terminations (packed with
controller).
Off Night Reduction continuously
Auto Continuous Boost
Continuous Day
when room is above required temperature (Td). (See note
under Fig.1 for operation of associated relay R2).
when plant is switched on (status of relay R1). To remove transparent fascia cover, insert metal key into top of cover as
shown (Fig.2), lever up and pull out. Push cover into position to replace.
Adjust settings by using the other end of the metal key (Fig.3).
Fig.1
Digital
Time
Switch
Setting day inside
temperature
Indicating
LEDs
(R2)
(Plant on)
Manual
programme
override switch Selector Fine Trim ±½hour
Room
temperature
cooling
overnight
Day
Temperature
Night
minimum
temperature
Setting
minimum
night inside
temperature
Design Preheat Time
Fig.2
Fig.3

3
INSTALLATION
FLUSH PANEL MOUNTING
1. Select location which is reasonably clean and dry, with adequate
access. Ambient limits 0 to 40°C.
2. Remove fascia cover (Fig.4) using the key supplied (Fig.2).
3. Rotate locking screws through a quarter turn and separate
controller sections (Fig.5).
4. Unplug ribbon cable by pressing outwards the side locking wings
(Fig.6). (If flush mounted, omit steps 5 to 8 and proceed to 9).
WALL MOUNTING (or Rear Panel Mounting)
5. Remove conduit cut-outs as required with a sharp knife. Screw
back section to wall (Fig.7). When trunking is used the controller
must be mounted using 32mm spacer bushes.
6. Connect wiring in accordance with appropriate scheme diagram.
Observe wiring precautions given in table on Page 8.
7. Move slide switch 'S' to correct position for the application (see
Commissioning, Fig.16).
8. Reassemble controller by plugging ribbon cable back into socket
on rear power board. Take care to align plug and socket the right
way round - DO NOT FORCE. Push controller case onto base
section, locating the two guide rods into the bushes and turn
screws to relock (Fig.8).
FLUSH PANEL MOUNTING
9. Move slide switch 'S' to correct position for the application (see
Commissioning, Fig.16).
10. Remove power board from the base section by undoing two front
screws 'A' (discard) and two rear screws 'B' which mount the
bushes (Fig.9).
11. Refit the two bushes into base section with screws 'B' (Fig.10).
12. Place the two hexagonal space bushes 'C' (supplied) over the
locking rods in front part of controller (Fig.11).
13. Carefully fold the ribbon cable as shown (Fig.12). Reposition the
power board over the ribbon cable (board points to rear when
assembled) using the two screws/washers 'D' supplied (Fig.13).
14. Fit controller into panel cut-out (138 x 138mm) and secure using
brackets/screws provided (Fig.14).
15. Wire up as step 6 and remove conduit cut-outs from base section,
see step 5.
16. Plug ribbon cable back into socket. Observe right way round - DO
NOT FORCE. Refit back of controller, locating the two bushes on
the guide rods and turn screws to relock (Fig.15).
Caution
Do not switch on mains power until commissioning checks 1 to 8
have been carried out.
COMMISSIONING
SYSTEM CHECK
1. Check that all equipment is correctly located and fitted.
2. Remove controller from back section (see Installation 2, 3 and 4).
3. Check all control circuit wiring.
a. Ensure there is no mains on low voltage (upper) terminals.
b. Check all wires are in accordance with scheme diagram or
diagrams on this leaflet.
c. Ensure all necessary links and resistors have been connected
or removed as instructed.
4. Check slide switch 'S' is in correct position for application.
5. Temporarily remove sensor wires and substitute a simulator. If not
available, connect a variable resistor, or switchable fixed resistors
of values approximately 2200 Ohms, 1800 Ohms and 1500 Ohms.
6. Rotate D.P.H. selector switch to fast run position 'T'.
7. Reassemble case, plugging in (ribbon cable) if unplugged.
8. Set Td to 20°C, Tn to 10°C, and override switch to Auto . If a
simulator is used, set this to 16°C. Otherwise select the 1800 Ohm
resistance to simulate this value.
9. Switch on power supply and set the clock as detailed in 'SETTING
THE CLOCK'.
10. Override time switch ON then OFF. See dialogue or digital clock
setting instructions for details.
11. Plant and R2 relays should now be 'Off'. (Neither LED illuminated).
12. Override time switch 'On'. After approximately 15 seconds the
'Plant' relay should energise and after a further 15 seconds relay
R2, when slide switch 'S' is in position 'A'. (Both LEDs illuminated).
13. This test simulates a 'Fast Run' optimum start period of 2 hours
speeded up to 30 seconds with a plant switch-on half way through
this period because the simulated inside temperature of 16°C is
half way between 12°C (max. preheat) and 20°C (zero preheat).
Boost is terminated when the relay R2 is energised at the end of
this period.
14. Override time switch to 'Off' position. Both plant and R2 relays
should de-energise. (Both LEDs off).
15. Set simulator above 20°C or select the 1500 Ohms resistance.
Relay R2 should energise ( LED illuminated).
16. Set simulator below 10°C or select the 2200 Ohm resistance. The
'Plant' relay should energise ( LED illuminated). This test is to
check frost protection.
17. Switch off power supply. Open case. Remove simulator or
resistances. Reconnect room sensor wires. Reassemble case.
Switch on power supply.
18. Set time switch and parameters as following section.
WALL MOUNTING
Fig.4
Fig.5
Fig.6
Fig.7
Fig.8
Fig.9
Fig.10
Fig.11
Fig.12
Fig.13
Fig.14
Fig.15
Position 'A' gives termination of boost on relay R2,
for use on applications involving day control from a
compensator or other Satchwell controllers (see
connection diagrams Fig.4 and Fig.5).
Position 'B' gives a single pole change-over output
from relay R2 for day control of pump/boiler and/or
motorised valve (see connection diagrams Fig.6,
Fig.7 and Fig.8).
Slide
switch 'S'
Fig.16
Slide switch 'S' on circuit
board inside front portion
of controller

4
SETTING THE CONTROLLER (SEE FIG.1).
1. Set Td to required 'Day' temperature during occupancy.
2. Set Tn to minimum 'Night' temperature during unoccupied periods.
3. Set dph to design preheat time. This is the maximum time required
for recovery to required day temperature after an unoccupied
period during which the inside temperature has fallen to 12°C.
a. Select the approximate time in whole hours on the rotary
switch (1 to 5 hours).
b. Fine trim ±1/2 hour on the associated setting potentiometer.
4. Note: ALL 'ON' times must be set earlier than the start of
occupancy by the selected pre-heat time (dph) set at (3) above.
Example:
DPH = 2 hours
Occupancy time = 8:00 am
Set clock 'ON' time to 6:00 am
ANALOGUE CLOCK OPERATION - SVT 4201
Cautions
DO NOT rotate the outer dial in any direction.
DO NOT rotate the minute hand anti-clockwise as this will damage
the mechanism.
Each day can be set independently.
Day 1 is Monday and Day 7 is Sunday.
The clock manual override switch has the following functions:
I-OFF
- Automatic control
II - ON
Overrides are usually set from the SVT and the clock override is left in
the Automatic position.
SETTING THE ANALOGUE SWITCHING TIMES
1. Set the required weekly programme by pushing in the blue
segments around the clock dial for all 'ON' periods and pulling
them out for all 'OFF' periods.
2. For omitted days such as Sunday all the segments must be pulled
out.
SETTING THE ANALOGUE CLOCK
1. Set the time by turning the minute hand clockwise until the correct
time and day is set.
2. Make sure the SVT manual override switch is set to AUTO mode.
SETTING THE DIGITAL CLOCK
1. SETTING THE TIME AND DATE
Time
indicator
Menu selection, back in menu,
actuation > 1 s = back to status display
Select menu items or set parameters. Confirm menu selection or adopt parameters
Reset
Press at the same time
13245
TIME
OFF
67
WI
NEXT
AUTO
Prog Memo free
Time 0:00
Date 01.01.2004
Su/Wi EU
TIME/DATE SU WI
PROG
MODE
SET TIME/DATE SU WI
SET TIME SET TIME SET TIME
SET TIME
SET
SET
DAY
DATE SET DATE
DAY
SET DATE
MONTH
SET DATE
MONTH
SET DATE
YEAR
SET
YEAR
DATE TIME/DATE SU WI
SET

5
2. SETTING SUMMER/WINTER TIME
3. SETTING THE PROGRAM
SU mmer WI nter
TIME/DATE SU WI
PROG
MODE
SET
TIME/DATE SU WI
SET
TIME/DATE SU WI
SET SET
SU WI
SET SU WI
SET
SU WI
SET
DAY
WI
WI
SET
DAY
WI SET WI
MONTH
SET
WI
MONTH
SET
WI
YEAR
TIME/DATE SU WI
SET
SU WI
SET
SU WI
SET
DAY
SU
SET
SU
DAY
SET
SU
MONTH
SET
SU
MONTH
SET
SU
YEAR
SET SU
YEAR
SU
TEST
MODIFY
NEW
PROG
MODE
SET
TIME/DATE SU WI
PROG
MODE
SET
Programming
One program = switch-on time + switch-off time + switch-on and switch-off days
Programs with predefined switch-on / switch-off days
• DAY 1-7 (MO-SU) • DAY 1-5 (MO-FR) • DAY 6-7 (SA and SU)

6
3. SETTING THE PROGRAM (CONTINUED)
13245
NEW PROG
67
13245
NEW
PROG
67
13 24
5
NEW
PROG
67
13245
NEW
ON
OFF
PROG
6713
24
5
NEW
ON
OFF
PROG
67
TEST
MODIFY
NEW
PROG NEW PROG
13
24
5
NEW PROG
6713
245
NEW
PROG
67
DAY
1-7
1-5
6-7
ANY
DAY
• • •
NEWPROG
13245
NEW
ON
OFF
PROG
67
13
245
ON
OFF
6713245
ON
OFF
67
13245
ON
OFF
6713245
ON
OFF
67
1 3245
ON
OFF
67
Select switch-on day Tuesday
Select switch-off day Tuesday
5x

7
4. MODIFYING THE PROGRAM
TIME/DATE SU WI
PROG
MODE
SET
TEST
MODIFY
NEW
PROG
MODE
SET
TEST
MODIFY
NEW
PROG MODIFY
PROG
MODIFY
PROG
1 3245
MODIFY
ON
OFF
PROG
67
1 324
5
MODIFY
ON
OFF
PROG
67
13
24
5
MODIFY
ON
OFF
PROG
6713
24
5
MODIFY
ON
OFF
PROG
67
TEST
MODIFY
NEW
PROG
• • •
Edit program
Change switching times
Change switching days
MODIFY
PROG
MODIFYPROG MODIFY
PROG
Prog 1 Prog 2 Prog 3
• • • •
NEW
PROG
13
245
MODIFY
ON
OFF
PROG
67
13245
ON
OFF
6713245
ON
OFF
67
13245
ON
OFF
6713245
ON
OFF
67
13
245
ON
OFF
67
5x
DEL ONE -> Delete a single program, DEL ALL -> Delete the programs for the channel
TEST
MODIFY
NEW
PROG
MODIFY
PROG
MODIFY
PROG
MODIFY
PROG
13245
MODIFY
ON
OFF
PROG
67
MODIFY
PROG
MODIFY
PROG
MODIFY PROG
Prog 2
• • •
MODIFY
PROG
Prog 3
• • •

8
5. TESTING THE PROGRAM
6. PERMANENT MODE
7.EXTRA MODE
WIRING PRECAUTIONS
For runs exceeding the above Limits (max. 300m) use one of the
following options:
•Screened cable. Earth at controller end only.
•MICC. Earth sheath at controller end only.
WARNINGS -
ALL RELAY OUTPUTS MUST USE A COMMON PHASE. DO NOT
MIX PHASES. THIS IS REQUIRED TO PREVENT FLASHOVER
BETWEEN DIFFERENT MAINS PHASES.
ALL RELAY OUTPUTS MUST USE A COMMON VOLTAGE I.E.
230Vac OR 24Vac. DO NOT MIX VOLTAGES. THIS IS REQUIRED
TO PREVENT THE POSSIBILITY OF FLASHOVER FROM 230Vac
TO 24Vac.
EXTERNAL RELAY(S) MUST BE USED TO SWITCH 24Vac WHEN
THE COMMON VOLTAGE IS 230Vac.
EXTERNAL RELAY(S) MUST BE USED TO SWITCH 230Vac WHEN
THE COMMON VOLTAGE IS 24Vac.
Cautions
Do not route relay output wiring with any other controller wiring.
Do not route triac output wiring with any other controller wiring.
Do not route power and output wiring with signal wiring.
Do not run Extra Low Voltage (24Vac or less) wiring in the same
harness as mains wiring.
IMPORTANT: Low voltage unscreened signal wiring must be run
in a separate loom or trunk from any mains wiring and spaced as
far as possible away from it (230Vac 45cm Min, 415Vac 58cm Min
both voltages are with respect to earth and a maximum current of
15A). For other voltages/currents refer to the IEE report titled
'Electro magnetic interference' September 1987
(ISBN85296353X).
TEST
MODIFY
NEW
PROG
TEST
PROG
PROG
C1
TEST
prog -> Programs in the order entered SERIAL -> Switching commands in chronological order
TEST
PROG
13
245
TEST
ON
OFF
PROG
C1
67
13245
TEST
ON
OFF
PROG
C1
67
13
245
TEST
ON
OFF
PROG
67
TEST
PROG
• • •
• • •
PROG
TEST
• • •
Prog 1 Prog 2
DAY 1 DAY 2
TIME/DATE SU WI
PROG
MODE
SET
AUTO EXTRAPERM
PROG
MODE
SET
AUTO EXTRA
PERM
MODE
AUTO EXTRAPERM
MODE
13245
TIME
ON
67
PERM
SU
PERM
13 245
TIME
OFF
67
PERM
SU
PERM
PERM
MODE
PERM
MODE
Continuous switching On/Off
13
245
ON
TIME
OFF
67
EXTRA
SU
NEXT
EXTRA
State of contact set by program will be reversed. The next program automatically returns the switch to ON or OFF as programmed.
TIME/DATE SU WI
PROG
MODE
SET
AUTO EXTRAPERM
PROG
MODE
SET
AUTO EXTRA
PERM
MODE AUTO EXTRA PERM MODE
Wiring from SVT
controller to: Maximum unscreened
length
Maximum
resistance per
core
DR 100m 15Ω
Connections to
compensator Relays etc. 100m 5Ω
Holiday Switch 30m 15Ω

9
CONNECTION DIAGRAMS
BASIC CONNECTIONS REMOTE HOLIDAY SWITCH RECORDER OUTPUT FOR
TEMPERATURE INDICATION
MAXIMUM BOOST PLANT
SWITCHED BY R1 COMPENSATED BOOST PLANT SWITCHED BY R1
DAY CONTROL OF
BOILER/PUMP DAY CONTROL OF PUMP WHEN BOILER IS ON CONTINUOUSLY THROUGHOUT DAY
(Frost protection - boiler and pump control).
TWO POSITION DAY CONTROL OF MAINS VOLTAGE
MOTORISED VALVE (Boiler/Pump on continuously
during day)
Slide Switch 'S' (see Fig.16)
R1 closes at optimum start or inside <Tn.
R1 opens at switch off time.
R2 makes 5-3 at occupancy time (boost termination).
R2 makes 5-4 at switch off time after inside temperature
cools to below Td.
R2 makes 5-3 if inside temperature >Td.
R2 makes 5-4 if inside temperature <Td.
(nominal differential 1°C).
1 & 2 - PLANT (Boiler/Pump)
3 - DAY
4 - BOOST
5 - COMMON
Fig.1
Voltage free outputs
WIRING PRECAUTIONS
Fig.2
The switch takes effect at
the next switch on time
HOLIDAY (Open)
AUTO (Closed)
Remove
link 6-7
Fig.3
RECORDER
0 to 10Vdc RECORDER 0 to 100mV input
0V = 5°C, 10V = 25°C
CSC 4201
CSC 4202
CSC 5252 Fig.4
Set 'SVT' to 1
in Fine Tune
mode
CSC 4201
CSC 4202
CSC 5252 Fig.5
Set 'SVT' to 0
in Fine Tune
mode
Fig.6
PLANT (Boiler/Plant)
Voltage free output
WIRING
PRECAUTIONS
Fig.7
To pump
control circuit
To boiler
control circuit
WIRING
PRECAUTIONS
Fig.8
PLANT
(Boiler/Pump)
Voltage free
output
Mains actuator
WIRING
PRECAUTIONS

Satchwell
Copyright © 2007, TAC AB
All brand names, trademarks and registered trademarks are
the property of their respective owners. Information contained
within this document is subject to change without notice. All
rights reserved.
TAC Headquarters
Malmö, Sweden
[phone]
Satchwell Helpline
[phone]
[e-mail]
DS 2.001
www.tac.com
01/07
WARNINGS -
ELECTRICAL SHOCK HAZARD. REMOVE ALL POWER FROM BOTH THE
CONTROLLER AND RELAY OUTPUTS BEFORE MAKING
TERMINATIONS.
ALL RELAY OUTPUTS MUST USE A COMMON VOLTAGE I.E. 230Vac OR
24Vac. DO NOT MIX VOLTAGES. THIS IS REQUIRED TO PREVENT THE
POSSIBILITY OF FLASHOVER FROM 230Vac TO 24Vac.
ALL RELAY OUTPUTS MUST USE A COMMON PHASE. DO NOT MIX
PHASES. THIS IS REQUIRED TO PREVENT FLASHOVER BETWEEN
DIFFERENT MAINS PHASES.
THIS PRODUCT CONTAINS A NICKEL CADMIUM BATTERY WHICH IS
COMPLETELY SAFE WHILST IN NORMAL OPERATION. BATTERIES
MUST BE DISPOSED OF IN AN AUTHORISED LANDFILL SITE.
Cautions
•Do not apply any voltages until a qualified technician has checked the
system and the commissioning procedures have been completed.
•If any equipment covers have to be removed during the installation of
this equipment, ensure that they are refitted after installation to
comply with UL and CE safety requirements.
•This is a mains operated device. Local wiring regulations and usual
safety precautions must be observed. Note Earthing requirements.
•Do not switch on mainspower until commissioning checks 1 to 8have
been carried out.
•Observe wiring precautions - see Page 8.
•Analogue clock: Do not attempt to turn 'hour' hand. Do not set theday
and time anti-clockwise as damage will occur.
•Do not short circuit sensor terminals for test purposes.
•Observe maximum ambient temperatures.
•Interference with parts under sealed covers renders the guarantee
void.
•Information is given for guidance only and TAC Satchwell does not
accept responsibility for the selection or installation of its products
unless information has been given by the Company in writing relating
to a specific application.
•Design and performance of TAC Satchwell equipment is subject to
improvement and therefore liable to alteration without notice.
•A periodic system and tuning check of the control system is
recommended. Please contact your local sales office for details.