Honeywell DHC 23 Operating Instructions Manual Download Page 22

Page: 22 / 31

SERVICE BY THE HEATING SPECIALIST

DHC 23

■■

Overview of further operating parameters DHC 23-2

Turn programming switch into position.

Further parameters can be displayed and changed by turning the service switch

into the positions 9....D.

The parameters can then be changed with the aid of the push and turn knob..

Position Operating parameter

Range

Basic setting

Outside temperature

only display

Flow temperature of the

only display

heating circuit M1

District heating return temperature

only display

Domestic hot water temperature

only display

Flow temperature unmixed circuit

only display

Flow temperature setpoint
mixed circuit

only display

Room temperature setpoint

only display

Flow temperature setpoint
unmixed circuit

only display

Maximum setpoint of the district

only display

heating return temperature

Configuration of 6th relay

2, 3

2 = circulation pump
3 = layered heating circuit

A = 10Room setpoint for layered

heating circuit

8...32 °C

B = 11

Heating characteristic slope
unmixed heating circuit

0.4...4.5

1.6

C = 12

Temperature selector input

1...3

1 = acts on both heating circuits
2 = acts only on mixed heating circuit
3 = acts only on unmixed heating circuit

D = 13

Automatic summer/winter time
can be switched off

05:03/05:10

E = 14

Current valve position M1

only display

F = 15

Software version

only display

Programming switch

Service switch

Push and turn knob

10878_BDA_DHC23_engl_neu 06.09.1999 13:50 Uhr Seite 22

Summary of Contents for DHC 23

Page 1: ...H DIGITAL DISTRICT HEATING CONTROLLER DHC 23 FOR ORIGINAL EQUIPMENT MANUFACTURERS OPERATING INSTRUCTIONS ...

Page 2: ...for DHC 23 3 15 Adaptation to district heating system 15 Restore basic adjustment 16 Correct the time 16 Battery change 16 Changes of the basic setting 17 Overview of operating parameters DHC 23 1 17 Overview of further operating parameters DHC 23 1 18 Overview of operating parameters DHC 23 2 19 Overview of further operating parameters DHC 23 2 20 Overview of operating parameters DHC 23 3 21 Over...

Page 3: ...tic preventive maintenance operation etc Clear arrangement of the operating elements on the front ensure simple operation The remote control TF 26 can be connected to the DHC 23 to operate it conveniently from the living room A patented Push and turn technique facilitates simple setting Date and time are preset in the factory as well as the following switching times Hot water is heated from 6 00 t...

Page 4: ...ater has its desired temperature constantly in the times of domestic hot water readiness An additional interruption of the domestic hot water priority is possible The DHC 23 limits the return temperature to the value prescribed by the district heating station To enable a temperature measurement in the return even with closed district heating valve the district heating valve is opened briefly every...

Page 5: ...ing etc must be made by the specialist according to the valid VDE regulations and correspond to the corresponding circuit diagrams see installation instructions 4 If an underfloor heating system is connected a limiting thermostat must be installed by the customer in addition in the flow line after the heating circuit pump to switch the pump off at too high flow temperatures If all these conditions...

Page 6: ...owever the high domestic hot water temperatures can be avoided by switching off the domestic hot water charging pump by hand using the switch on the pump if present Temperature setting on the DHC 23 The domestic hot water temperature can be set on the DHC 23 up to 75 C Do not separate the DHC 23 from the power supply The battery for protecting all individual data is otherwise loaded and must be re...

Page 7: ...ng Grasp the recessed grip on the left behind the flap pull it slightly and open the flap downwards The following operating elements are fitted behind it Programming switch With the programming switch you can select whether heating times or times for domestic hot water readiness should be changed Push and turn knob With the push and turn knob you can in combination with the programming switch chan...

Page 8: ...here is risk of frost a temperature corresponding to the night set temperature value is regulated reduced temperature This setting is practical for holidays for instance Continuos heating mode The heating is on right round the clock Domestic hot water readiness is switched on corresponding to the set switching times Manual mode For commissioning or for emergency operation Heating and domestic hot ...

Page 9: ... Warning With domestic hot water temperatures above 60 C there is danger of scalding at all domestic hot water taps kitchen bathroom You must then mix cold water sufficiently The domestic hot water temperature can be set with the aid of the domestic hot water temperature knob between 35 C and 75 C The set setpoint is always the cut in value The domestic hot water charging is completed after reachi...

Page 10: ...the time symbols show the operating state of the DHC 23 or which parts of the system the DHC 23 is just controlling The following symbols can appear The heating is on currently The heating is off currently The domestic hot water is currently being heated domestic hot water readiness The district heating valve opens The district heating valve closes The district heating valve is in neutral position...

Page 11: ...tion In this position the switching times for domestic hot water readiness can be set 4 swit ching times i e 2 periods are available for domestic hot water readiness for each indi vidual weekday see Change switching times section In this position the outside temperature is displayed this position is not used by the user for setting the system In this position the switching times of the circulation...

Page 12: ... is overwritten 3 Now make the setting with the push and turn knob Push knob A or the weekday flashes Turn knob The weekday changes and continues to flash Turn it until the weekday to be changed flashes or A if you want to change the switching times affecting all weekdays Push knob The 1st cut in time flashes also the 1st bar in the display and Turn knob The flashing bar moves along at the same ti...

Page 13: ...d cut off time exactly equal i e 12 00 cut in and 12 00 cut off For this purpose simply move the cut off bar over the cut in bar After confirmation of all switching times the deleted switching times are no longer dis played The deleted switching times become visible again by pushing and turning to the right or left ...

Page 14: ...rding to outside temperature a setpoint for the flow temperature between 20 C and 90 C results through the heating characteristic The heating characteristic slope refers to 20 C outside temperature The curvature of all heating characteristics is uniformly 1 33 The heat up optimization has the effect that the start of heating up of the heating system is defined according to outside temperature so t...

Page 15: ... temperature and the onset point of the floating remote heating return temperature limitation in heating mode can be set the floating return temperature limitation can be switched off by selecting 10 C as onset point Return temperature onset point of the floating limitation return temperature limitation Example 1 90 C 10 C factory setting Example 2 50 C 10 C Fixed value limitation Example 3 80 C 5...

Page 16: ... domestic hot water charging the return temperature limitation can be cancelled The higher values for the return temperature allowed for this special case are determined here The entry of 0 min time set in the factory is treated as absolute domestic hot water priority The heating circuit pump is switched off as long as domestic hot water is being charged However should the heating circuit cool dow...

Page 17: ...es After the first push the day and month can be chan ged after the second push the year Turn knob The value changes and can be adapted Push knob The values flashes no longer and is adapted 6 Bring the service switch back to 0 position Thus the weekday and the current time are displayed again during operation 7 Reattach the cover 8 Close the flap again Service switch Push and turn knob Programming...

Page 18: ...stand at auto 2 The time is now corrected with the push and turn knob Push knob Time flashes Turn knob Correct time Push knob Time no longer flashes and is corrected 3 Close the flap again Battery change Warning Do not separate the DHC 23 from the mains during the battery change otherwise all individual data are lost The battery serves for storing the set data in the case of a power failure So tha...

Page 19: ... year 1990 2089 current date 2 Max flow setpoint 30 120 C 90 C 3 Night setpoint 0 20 C 10 C 4 Frost protection limit 10 15 C 2 C 5 Heating characteristic slope 0 4 4 5 1 6 6 Building construction for optimization 0 1 2 3 0 0 optimization off 1 light construction 2 medium construction 3 heavy construction 7 Valve actuator M1 running time 10 1800 s 120 s 8 Overwrite TF 26 status 0 1 0 0 do not overw...

Page 20: ...isplay 5 Domestic hot water charging temperature only display 6 Room temperature setpoint only display 7 Flow temperature setpoint only display 8 Maximum setpoint of the district only display heating return temperature 9 Layered domestic hot water storage tank switching 10 20 K 0 C difference WW1 and WW2 A 10 Switching difference for 0 10 K 1 K domestic hot water pump run on B 11 Maximum district ...

Page 21: ...it 10 15 C 2 C 5 Heating characteristic slope 0 4 4 5 1 6 6 Building construction for optimization 0 1 2 3 0 0 optimization off 1 light construction 2 medium construction 3 heavy construction 7 Valve actuator M1 running time 10 1800 s 120 s 8 Valve actuator M2 running time 10 1800 s 30 s 9 Max inlet temperature in 40 90 C 90 C WW heat exchanger VF1 A 10 District heating valve minimum lift 0 30 0 B...

Page 22: ...nly display 5 Flow temperature setpoint mixed circuit only display 6 Room temperature setpoint only display 7 Flow temperature setpoint unmixed circuit only display 8 Maximum setpoint of the district only display heating return temperature 9 Configuration of 6th relay 2 3 3 2 circulation pump 3 layered heating circuit A 10 Room setpoint for layered heating circuit 8 32 C 20 B 11 Heating characteri...

Page 23: ...tion limit 10 15 C 2 C 5 Heating characteristic slope 0 4 4 5 1 6 6 Building construction for optimization 0 1 2 3 0 0 optimization off 1 light construction 2 medium construction 3 heavy construction 7 Valve actuator M1 running time 10 1800 s 120 s 8 Valve actuator M2 running time 10 1800 s 30 s 9 Max inlet temperature in WW heat exchanger VF1 40 90 C 90 C A 10 District heating valve minimum lift ...

Page 24: ...K 10 0 K B 11 Maximum district heating return temperature only for domestic hot water charging 40 90 C 90 C C 12 Valve actuator M2 configuration 0 1 2 2 0 modulating 2 10V 1 3 point 2 both parallel D 13 Automatic summer winter time can be switched off 05 03 05 10 E 14 Valve position only display F 15 Absolute priority 0 min 0 min time interruption of hot water priority 1 30 min parallel mode 40 1 ...

Page 25: ...rm Measures Set the operating mode switch to auto Have the heating characteristic changed by the heating specialist Possibly the electrical connection to the actuator of the remote heating valve is interrup ted Call heating specialist Set domestic hot water temperature knob lower or Turn operating mode switch from to auto Causes Operating mode switch is not on auto The heating characteristic setti...

Page 26: ... fuses Due to an internal unit error or a discharged battery the current time is disturbed and the basic factory setting is valid again Delete the error display see Error messages of the DHC 23 section Enter the current time again see Correct the time section and as required your wanted switching times again see Change switching times section Have the values for adapting to your district heating s...

Page 27: ...mperature sensor faulty 8 Cable to the remote control TF 26 interrupted 9 Domestic hot water temperature sensor faulty at the cut off point 10 Domestic hot water temperature sensor faulty 11 Domestic hot water flow temperature sensor faulty 12 Connection between two DHC 23 faulty 13 The basic factory setting has been restored In the case of errors the corresponding input is considered as not conne...

Page 28: ...he night night shutdown The heating is on round the clock Domestic hot water readiness is switched on corresponding to the set switching times Heating is off Domestic hot water readiness is switched on corresponding to the set switching times Knob for the room temperature setpoint effective only in the and auto position of the TF 26 operating mode switch Setting range 7 7 K Mid position 0 K The se...

Page 29: ...2 00 Automatic preventive maintenance Heating circuit pump daily 10 00 1 min operation Summer winter time changeover Start of summer time last Sunday in March 2 00 1 hour forwards Start of winter time last Sunday in October 3 00 h 1 hour back Supply voltage 230 V AC 6 15 50 60 Hz Power consumption 5 W Data protection Individual data protection eg during power failure by an exchangeable battery for...

Page 30: ...elay 230 Vac 3 1 A DHC 23 3 only The second valve actuator output can either be floating relay or modulating 2 10 V adjustable by software during start up Binary outputs depending on DHC 23 type Maximum 4 relay outputs for pump control 230 Vac 3 1 A Maximum current over all relays 8 A Temperature diagnostic output TTL level transfer over RS 232 with separate adapter Sensor cables For troublefree o...

Page 31: ...g Control Products Honeywell AG Böblinger Strasse 17 D 71101 Schönaich Phone 49 70 31 637 01 Fax 49 70 31 637 493 http europe hbc honeywell com EN2B 160 GE51R0999 Subject to change without notice Printed in Germany s H ...

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