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XTC 638

Compensating optimiser for burners
of any type including sequencing of several boilers

Application

Designed for temperature control of a normal burner or a 3-point or 0…10 V modulating burner, with normal or condensation boilers.
Using one controller for each boiler (max. 7) you can obtain a sequence of several boilers and of the shut-off valves where these exist.
Control of the criteria of setting the boiler in sequence, in order to optimise the seasonal energy production: – wide adaptability to all types of burner and boiler..
Data exchange with other boilers and other controllers by means of C-Ring.
Essential sensors: 1 boiler sensor, 1 single external sensor for the boiler(s),
1 sensor for manifold if there are several boilers.
Optional sensors: 1 heating flow sensor, 1 room or flue gases sensor, 1 DHW sensor

Schematic diagram Certification Catalogue

Code	Description	Data Sheet
XTC 638	Compensating optimiser for burners of any type including sequencing of several boilers.	A 610

Data sheet

Wiring diagram

Accessories

Certification

Power supply: 230 V-; Consumption: 5 VA; Modular housing DIN 105 x 115; Protection: IP 40.
Digital programming by means of 4 operating keys and alphanumeric display.
Control of site:
– Single boiler + heating with pump or with or without mixing valve + DHW.
– Boilers in sequence (max. 7) + heating with pump and with or without mixing valve + DHW.
– Boilers in sequence (max. 7) + C-Ring connection with other COSTER controllers + DHW
– Compensated: according to outside temperature with desired room temperature Normal, Setback.
– Fixed Point with desired flow temperature.
– Minimum and maximum limits boiler and flow temperatures.
WARNING! The mixing valve and the storage tank control are not available on all the configurations of boiler sequence.
Always refer to the Technical Data Sheet.
Control of modulating 3-point burner (common – increase – decrease). 0…10 V or On-Off in 1 stage or On-Of in 2 stages.
On-Off control of boiler shut-off valve.
On-Off control of pump (boiler, manifold, heating site).
Timed programming with four 24hour programs and one 7day program.
Programming with dates with one Special period and heating season.
Automatic change GMT/BST.
Eco Off” function: heating off with outside temperature above desired value.
Three On-Off inputs and two On-Off outputs for services and various automations (e.g.burner lockout).

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Compensating optimiser for burners
of any type including sequencing of several boilers