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TEMPERATURE CONTROLLER
FOR MODULATING BURNERS
BUS
C RING
C
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 :
– 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 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.
3. DETECTORS & REMOTE CONTROL
No.
1
Immersion-type boiler temp. detector
1
Outside temp. detector
1
Flue gases temp. detector
1
Manual remote control
We reserve the right to make changes without notice
– 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.
- 1 alarm for burner lockout with simultaneous total exclusion of the boiler with locked-
out burner (closure shut-off valve and pump idle)
Description
A 511 - DTC 628 Eng.
Type
Sensing
element
SIH 010
NTC 10 kΩ
SAE 001
NTC 1 kΩ
STF 001
PT
1 kΩ
CDB 301
–
06.12.05 LB
A 511
06.12.05 LB
Code
Data
sheet
B4
N 140
B2
N 120
B7
N 165
A
–
1
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Summary of Contents for Coster DTC 628
- Page 1 – 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: •...
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Page 2: Technical Data
A 511 - DTC 628 Eng. 06.12.05 LB 4. TECHNICAL DATA • Electrical • Compensated control boiler temperature Power supply 230 V ~ ± 10% Heat emitters : – RADIATORS – FAN COILS – PANELS Frequency 50 … 60 Hz Design flow temperature :... -
Page 3: Wiring Diagrams
A 511 - DTC 628 Eng. 06.12.05 LB 7. WIRING DIAGRAMS A – Automatic remote control for changing program in use F – Series of thermostats, boiler and safety burner B2 – Outside temp. detector (NTC 1 kΩ ; -30…40 °C) M –... - Page 4 – 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.
- Page 5 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. C R i n g c o n n e c t i o n Each DTC 628 can determine the temp.
- Page 6 A 511 - DTC 628 Eng. 06.12.05 LB 12. EXAMPLES OF PLANTS T y p e o f c o n t r o l A modulating boiler with zone without control valve . C O M P E N S - F I X E D P in the timed programming use the room temperature : NORMAL 1…5 , SETBACK 1-2 , FROSPROT.
- Page 7 A 511 - DTC 628 Eng. 06.12.05 LB i n c r e a s e T B o i l e r T y p e o f c o n t r o l Several modulating boilers with zones regulated by controllers in C-Ring.
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Page 8: Operation
DTC 628 is a microprocessor-based digital controller especially suitable for controlling the tempe- rature of a boiler with modulating burner. When the plant comprises several modulating boilers in parallel, each DTC 628 controls its own boiler and related shut-off valve with autonomous timed event programmes and desired temperatures; this permits flexible management of the boilers to meet plant requirements. - Page 9 06.12.05 LB Zones The zones control can be used when DTC 628 is connected in C-Ring with the controllers of the zones and accordingly is able to know the maximum temperature requested by these circuits (see Example of Sites 12.3.4). The controller is able to run automatically according to the requirements T y p e o f c o n t r o l of the zones, without the need for its own timed program.
- Page 10 Control shut-off valve Y When several boilers use a single manifold it often happens that the boilers are shut off by valves that allow isolating the unused boilers. DTC 628 can control the shut-off valve by means of SPDT switch 5-6-7.
- Page 11 A 511 - DTC 628 Eng. 06.12.05 LB 16. PROGRAMMES & PERIODS WITH DATES It is possible to program the boiler control operation according to consumer requirements by means – 7 24hour programmes – 2 7day programmes – 25 holiday periods –...
- Page 12 A 511 - DTC 628 Eng. 06.12.05 LB Holidays periods Each holiday period, defined by the start and end dates, sets an operating program, the same for all holiday periods, which replaces that in use. At the end of each period the controller returns to the previous program.
- Page 13 A 511 - DTC 628 Eng. 06.12.05 LB 17. COMPLEMENTARY FUNCTION Access keynumber Choice and enabling of access keynumber which prevents the use of + and – keys and thereby any modification of the data. Enter the number (1900 … 1999) using + and – keys.
- Page 14 A 511 - DTC 628 Eng. 06.12.05 LB 18. ALARMS The alarms processed by the controller are of four types: – alarms for malfunctioning of the controller, signalled by LED 6. – functional alarms (measurement deviations), signalled by 6. – alarms for short or open detector circuits, signalled by LED 6.
- Page 15 – all the controllers are selected on the testing page DTC 628 sends via C-Ring a signal every 5 seconds. On all appears. If the connection if satisfactory the word “YES” replaces “??” on all the displays. If on one or more displays “YES” does not appear this means that there is a break between the last controller with “YES”...
- Page 16 A 511 - DTC 628 Eng. 06.12.05 LB 20. SEQUENCE OF DISPLAY PAGES (data and functions are those in memory at delivery) P r o g r a m : S i t e - - - - - - - - - - - - M o d e : N O R M A L 1 2 .
- Page 17 A 511 - DTC 628 Eng. 06.12.05 LB M0. NORMAL USE Ref. Display Description Notes Sect. S i t e - - - - - - - - - - - - Set in M6. Name site 1 2 . 1 8 M o n d a y Set in M0.
- Page 18 A 511 - DTC 628 Eng. 06.12.05 LB M1. TEMPERATURES & CONTROLS Ref. Display Description Notes Sect. S p e e d i n c r e a s e Desired boiler temperature gradient. Maximum Ensure that a too rapid increase in boiler temperature D e s B o i T : 9 9 .
- Page 19 A 511 - DTC 628 Eng. 06.12.05 LB M3. MEASUREMENT Ref. Display Description Notes Sect. O u t s i d e t e m p Outside temp. measured by B2, C-Ring: coming C-Ring instead of actual if value comes from C- A c t u a l : –...
- Page 20 Group to which controller assigned. C R i n g c o n n e c t i o n Definition of C-Ring connection: DTC 628 controllers cannot receive, via C-Ring, the – NO : without C-Ring connection. desired temp. from the plant controllers.
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