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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
3. DETECTORS & REMOTE CONTROL
No. Description Type Sensing Code Data
element sheet
1 Immersion-type boiler temp. detector SIH 010 NTC 10 kΩ B4 N 140
1 Outside temp. detector SAE 001 NTC 1 kΩ B2 N 120
1 Flue gases temp. detector STF 001 PT 1 kΩ B7 N 165
1 Manual remote control CDB 301 – A –
A 511
06.12.05 LB
TEMPERATURE CONTROLLER
FOR MODULATING BURNERS
DTC 628 Eng.
• Boiler temperature controller with 3-wire modulating control
• Communication systems :
– C-Bus for Telemanagement
– C-Ring for exchange data of common interest between local controllers
• Power supply 230 V~ , DIN rail mounting
1. APPLICATION
DTC 628 controller is designed for temperature control of a boiler with three-wire modulating burner (common increase - decrease).
2. FUNCTIONS
The principal functions of DTC 628 are:
• The control of the boiler temperature can be :
– Compensated / Fixed Point :
– Compensated: variable in relation to outside temperature.
Use the desired room temperatures: Normal 1...5; Setback 1-2, Frost Protection.
– Fixed Point: at fixed point.
Use the desired boiler temperatures: Fixed Point 1and Fixed Point 2.
– Zones: variable in relation to temperature requested by controllers of these zones connected in C-Ring.
• Control 3-wire modulating burner (common - increase - decrease).
• On-Off control of boiler shut-off valve
• On-Off control boiler pump or manifold or heating plant..
• Timed programming with seven 24hour and two 7day programmes.
• Programming with dates: 25 annual periods; one special period; heating season.
• Automatic switching British Summer Time (BST)/Greenwich Mean Time (GMT).
• Eco Off function: boiler off when outside temperature exceeds a pre-set value.
• Remote control for changing programme in use.
• Four On-Off inputs for : - 3 general alarms
- 1 alarm for burner lockout with simultaneous total exclusion of the boiler with locked-
out burner (closure shut-off valve and pump idle)
• 1 input measurement flue gases temperature.
• Alarms for short or open detector circuits and defective controller..
• C-Ring connection for local exchange of data with other controllers.
• C-Bus connection for transmitting data to local PCs or remote Telemanagement PC.
• Simulation of operation for testing electrical connections at commissioning.
BUS
C
C
RING
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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
5. OVERALL DIMENSIONS 6. FACIA
1
2
4
5
6
37 8
9 10 11
4. TECHNICAL DATA
• Electrical
Power supply 230 V ~ ± 10%
Frequency 50 … 60 Hz
Consumption 5 VA
Protection IP40
Radio disturbance VDE0875/0871
Vibration test with 2g (DIN 40 046)
Voltage-free output contacts:
Maximum switched voltage 250 V ~
Maximum switched current 5 (1) A
Construction standards Italian Electrotech. Committee(CEI)
Data storage in memory no limits
• Mechanical
Case DIN 6E module
Mounting on DIN 35 rail
Materials:
Base NYLON
Cover ABS
Ambient temperature:
Operating 0 … 45°C
Storage – 25 … + 60°C
Ambient humidity Class F DIN 40040
Dimensions 105 x 115 x 71.5 mm
Weight 0.6 kg
• Programmes, events & periods
24hour programmes 1…7
Daily events 2…6
7day programmes 0…2
Annual periods 0…25
Special period 1
• Measurement ranges
Outside temperature – 30,0…+ 40,0 °C
Boiler temperature 0.0…99.0 °C
Flue gases temperature 0…510 °C
• Compensated control boiler temperature
Heat emitters : – RADIATORS – FAN COILS – PANELS
Design flow temperature :
Radiators 40.0…70.0…99.0 °C
Fan coils 40.0…80.0…99.0 °C
Panels 20.0…40.0…50.0 °C
Design outside temperature – 30.0…– 5.0…+ 20.0 °C
Correction curve origin 20.0…40.0 °C
Desired programmable room temperatures:
5 NORMAL 0,0…30.0 °C
2 SETBACK 0,0…30.0 °C
FROST PROTECTION 0.0…6.0…30.0 °C
• Control boiler temperature at “Fixed Point”
2 desired FIXED POINT temperatures 0.0…99.0 °C
• Control temperature boiler "zones"
Increase boiler temp. over that
of zones 0,0…5,0…50,0 °C
• Boiler setting data
Burner modulation time 30…75…3,600 s
Burner minimum On time (fixed) 60 s
Burner On-Off differential 0.5…5.0…50.0 °C
Boiler temp. limits
Minimum 1.0…99.0 °C
Maximum 1.0…99.0 °C
Eco Off outside temp: – 30.0…+18.0…+ 40.0 °C
Delay closure shut-off valve 0…30…60 min
• Setting for Telemanagement & alarms (from PC)
Attempted calls for sending alarms 2… 5…200
Interval between calls for sending alarms 2…10…210 min.
Alarms (setting from PC):
Difference boiler temp. (B4) 0.5…5…99 °C
Max. temperature boiler 1…95…99 °C
Max. temp. flue gases 2…500…510 °C
Delay single alarms 2…30…255 min.
1 – Protective cover for electronic components
2 – Base with transformer, relay and terminal blocks
3 – Screws for securing base and cover
4 – DIN rail securing elements
5 – DIN rail release lever
1 – Alphanumeric display
2 – + and – keys
3 – ← and → keys
LEDs :
4 – Increase modulation control
5 – Decrease modulation control
6 – Shut-off valve
7 – On-Off burner
8 – Recycle or plant pump
10 – Burner lockout alarm
11 – Measurements & detectors alarms
12 – Fault Alarm
1
2
3
3
4
5
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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
7. WIRING DIAGRAMS
A – Automatic remote control for changing program in use
B2 – Outside temp. detector (NTC 1 kΩ ; -30…40 °C)
B4 – Boiler temp. detector (NTC 10 kΩ ; 0…99 °C)
B7 – Flue gases temp. detector (PT 1 kΩ ; 0…500 °C)
bb – Alarm contact lockout burner
E – Burner
E.1 – On-Off control burner
E.3 – 3 wire modulation control burner
F – Series of thermostats, boiler and safety burner
M – Boiler pump or manifold or heating plant
k 1…3 – Switch for signalling alarm or status
Y – Boiler shut-off valve
Yfc – Valve end run (permission On burner)
C-Bus – Transmission of data by Telemanagement
C-Ring – Transmission of data between controllers
8. ELECTRICAL CONNECTIONS
Proceed as follows:
• Separate base from cover
• Mount the base on the DIN rail and check that it is firmly anchored by the securing elements (5.4)
• Carry out the wiring according to the diagram and in compliance with the regulations in force and using:
– 1.5 mm2 cables for power supply and relay control outputs;
– 1 mm2 cables for the detectors and remote control;
– 1 mm2 cables for C-Bus. For length limits see data sheets T 021 and T 022.
• Apply power (230 V~) and check its presence across terminals L and N.
• Remove power, replace cover on base/terminal block and secure it with the four screws supplied (5.3).
You are advised not to insert more than two cables in a single terminal of the controller and, if necessary, to use an
external junction box.
9. SITING CONTROLLER AND DETECTORS
9.1 Controller
The controller must be installed in a dry location that meets the ambiental limits given under TECHNICAL DATA.
If installed in a space classified as “Hazardous” it must be mounted in a cabinet for electrical appliances constructed
according to the regulations in force for the type of danger concerned.
The controller can be mounted on a DIN rail and installed in a standard DIN enclosure
9.2 Boiler temperature detector B4
This detector must be installed in the boiler flow pipe, as close as possible to the boiler output itself
9.3 Outside temperature detector B2
This must be installed outside the building, on the north or north-west side, at least three meters from the ground,
out of direct sunlight and as far as possible from windows, doors, fireplaces and other possible sources of thermal
disturbance.
9.4 Boiler flue gases temperature detector B7
This must be installed on the boiler-chimney metal connecting pipe.
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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
C R i n g co n n e c t i o n
P R I M A R Y
10.3 Several DTC 628 connected together in C-Ring without Heating/DHW circuit controllers.
One of the DTC 628 must be PRIMARY ; the others must be SECONDARY.
The C-Ring connection serves only for sharing the outside temperature.
Each DTC 628 can determine the temp. of its own boiler by :
– own programming.
– remote control A for changing the program in use.
10. C-RING COMMUNICATION BETWEEN CONTROLLERS (for detailed information see data sheetT 022)
In the serial C-Ring the following signals are transmitted:
– permission to operate as Slave controllers
– value of outside temperature use of a single detector for several controllers
– value of the flow temperature requested by the zone controllers, used by the DTC 628 con-
trollers to regulate the temperature of the boilers.
Only one of the controllers connected in C-Ring can be configured as PRIMARY.
10.1 Not connected in C-Ring.
DTC 628 can determine the temp. of the boiler by using:
– own programming
– remote control A to modify program in use.
10.2 Connected in C-Ring with other Heating/DHW circuit controllers.
DTC 628 can be PRIMARY and can determine the temp. of the boiler using:
– value of flow temp. requested by zone controllers
– own programming
– remote control A to modify program in use.
M6.4
C R i n g c o n n e c t i o n
N O
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
C R i n g co n n e c t i o n
P R I M A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g co n n e c t i o n
S E C O N D A R Y
Slave controller
or
M6.4
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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
10.4 Several DTC 628 connected in C-Ring with other Heating/DHW circuit controllers.
One of the DTC 628 must be PRIMARY ; the others must be SECONDARY.
Each DTC 628 can determine the temp. of its own boiler using:
– the value of the flow temp. requested by the zone controllers.
– own programming.
– remote control A for changing program in use.
M6.4
C R i n g c o n n e c t i o n
P R I M A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
The U terminal of the DTC 628 Secondaries
must not be connected
11.2 Address for Telemanagement
Under Telemanagement, in order for the controllers to be identified by the central PC and/or by the
local PCs, they must be assigned a progressive address number.
The regulators can also be subdivided into groups according to certain common properties (e,g,
same geographical area,).
When Telemanagement is not scheduled leave the address in memory (–).
To cancel the values press + and – keys at the same time.
11.3 Sending alarms
• Send alarms : NO = alarms not sent
YES = alarms transmitted to central PC
• PassWTeleman : NO = password not enabled
YES = password enabled
M6.3
A d d r e s s : –
G r o u p : –
M6.2
S e n d A l a r m s : N O
P a s s W T e l e m a n : N O
11. C-BUS COMMUNICATION FOR TELEMANAGEMENT (for detailed information see data sheet T 021)
Via the C-Bus output DTC 618 can be Telemanaged – two-way data communication with one or more
local PCs and/or the central control computer via the (PSTN) telephone network,
From the PC or PCs you can:
– see and/or modify the data and values set on the display pages of the controller and configuration
data dedicated exclusively to Telemanagement (see “Technical Data”).
– see the operational status of the plant components (pumps, auxiliaries in general)
– acquire the alarms coming from the plant
– read the detector measurements (temperatures: outside, flow, boiler, etc)
11.1 C-Bus electrical connections
C R i n g c o n n e c t i o n
P R I M A R Y
C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
C R i n g c o n n e c t i o n
S E C O N D A R Y
Slave controller
or
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
M6.4
C R i n g c o n n e c t i o n
S E C O N D A R Y
M6.4
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A 511 - DTC 628 Eng. 06.12.05 LB
We reserve the right to make changes without notice
12. EXAMPLES OF PLANTS
12.1 A modulating boiler with zone without control valve .
12.2 A modulating boiler with zones regulated by controllers not connected in C-Ring.
B2 – Outside temp. detector
B4 – Boiler temp detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off control burner
E.3 – Modulating control burner
F – Boiler thermostats
M – Manifold pump
M1 – DHW storage pump
No.1…n – Zone controllers
12.3 A modulating boiler with zones regulated by controllers connected in C-Ring .
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
in the timed programming use the room temperature :
NORMAL 1…5 , SETBACK 1-2 , FROSPROT.
T y p e o f c o n t r o l
C O M P E N S - F I X E D P
M6.1
Compensated control: in the timed programming use the room temp. : NORMAL 1…5 , SETBACK 1-2 , FROSPROT.
To ensure the necessary temp. for the storage of DHW use the CDB 301 (A) remote control operated (5-M)
by the On switch of the storage tank M1 with FIXED POINT 1 temp.
Control A Fixed Point: in the timed programming use the boiler temp. FIXED POINT 1-2.
T y p e o f c o n t r o l
Z O N E S
M6.1
B2 – Outside temp. detector
B4 – Boiler temp. detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off burner control
E.3 – Modulating burner control
F – Boiler thermostats
M – Heating plant pump
A – Automatic remote control CDB 301
B2 – Outside temp. detector
B4 – Boiler temp detector
B7 – Flue gases temp. detector
E – Burner
E.1 – On-Off control burner
E.3 – Modulating control burner
F – Boiler thermostats
M – Manifold pump
M1 – DHW storage pump
No.1…n – Zone controllers
i n c r e a s e T Bo i l e r
f o r z o n e s : x x . x c
M1.12
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