Related Manuals for Honeywell DHC 23
Summary of Contents for Honeywell DHC 23
- Page 1 DIGITAL DISTRICT HEATING CONTROLLER DHC 23 FOR ORIGINAL EQUIPMENT MANUFACTURERS OPERATING INSTRUCTIONS...
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Page 2: Table Of Contents
Service by the heating specialist Basic settings General functions and operating parameters Special functions and operating parameters for DHC 23-1 Special functions and operating parameters for DHC 23-2 Special functions and operating parameters for DHC 23-3 Adaptation to district heating system... -
Page 3: Short Description
SHORT DESCRIPTION Properties of the DHC 23 The DHC 23 is a digital controller for district heating systems. It has the complete intelligence which is required for optimum control of a modern district heating system. Outside temperature compensated time-dependent flow temperature control... -
Page 4: Safety Notes
The room temperature can be regulated accurately using the thermostats fitted to the radiators. Heat-up optimization The DHC 23 selects the latest possible start of the temperature rise so that the required room temperature is already reached at the set time. Night-time cut-off The room temperature is lowered to a programmable value (night setpoint) in the night during the heating period. - Page 5 DHC 23 SAFETY NOTES Purpose The DHC 23 is designed exclusively for regulating and controlling district heating systems including domestic hot water heating which do not exceed a maximum flow temperature of 120 °C. Prerequisite for commissioning 1. The district heating system must be ready and filled with water so that the pumps do not run dry.
- Page 6 In the manual mode, the domestic hot water can be heated up to the maximum Manual mode possible flow temperature. This mode is used especially if the DHC 23 should be defective. However, 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).
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Page 7: Operating Elements
DHC 23 OPERATING ELEMENTS To be able to handle the district heating controller DHC 23 well, it is divided into 3 operating levels: 1st operating level: Operation by the user In this level the user sets the basic heating functions. The operating elements required for this are fitted on the front. - Page 8 DHC 23 Operating mode switch Select operating mode The operating modes of the DHC 23 can be set with the operating mode switch. The meaning of the individual positions is illustrated by symbols. Normal mode Heating and domestic hot water readiness are switched on corresponding to the set switching times.
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Page 9: Operation By The User
DHC 23 OPERATION BY THE USER Select temperatures Select room temperature The setpoint for the room temperature can be set with the aid of the room temperature knob between 8°C and 32°C. The room setpoint can also be set with the remote control TF 26. -
Page 10: Lcd Display
The weekday and the current time appear on the left below. 1 = Mo … 7 = Su On the right next to 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. -
Page 11: Adjustment By The User
DHC 23 ADJUSTMENT BY THE USER Grasp the recessed grip on the left behind the flap, pull it slightly and open the flap downwards. Two knobs are located behind it. Programming switch Programming switch The left knob is the programming switch, it has five positions. -
Page 12: Change Switching Times
DHC 23 Change switching times The DHC 23 is already equipped in the factory with a basic setting for the switching times for heating and domestic hot water which satisfies normal requirements. You can change this basic setting simply at any time. -
Page 13: Delete Switching Times
DHC 23 ADJUSTMENT BY THE USER Delete switching times 2 switching times are deleted by setting the cut-in time and 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. -
Page 14: Service By The Heating Specialist
(Service switch position 0 and 1) taken into account automatically as well as summer and winter time. Maximum flow setpoint (2) The DHC 23 ensures that the setpoint of the flow temperature never exceeds the set maximum value. Night setpoint (3) The room temperature is lowered during the heating period in the night to the set night setpoint (night cut-off). - Page 15 If the system takes too long until the room setpoint is reached, then the controller gain should be increased. The DHC 23 switches over automatically from summer to winter time. The change from winter to summer time is made in the last weekend in March. The change back is Summer/winter time change made in the last weekend in October.
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Page 16: Special Functions And Operating Parameters For Dhc
DHC 23-1 Overwrite TF 26 status (8) If the DHC 23 is controlled at the input TW by a system other than the remote control TF 26, it must be possible to ignore a signal applied at this input. Activating this function has the effect that the applied signal is taken into account only up to the next switching time and then ignored. -
Page 17: Adaptation To District Heating System
"open". Only if actuators other than the usual Honeywell motors are connected may the running time have to be adapted. The reset time of the control circuit M2 can be adapted in critical systems. -
Page 18: Correct The Time
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 that no... -
Page 19: Changes Of The Basic Setting
Different values can be displayed by turning the service switch into the positions 0 ... F (see Table). The parameters can then be changed with the aid of the push and turn knob.. Overview of operating parameters DHC 23-1 Position Operating parameter Range... -
Page 20: Overview Of Further Operating Parameters Dhc 23-1
SERVICE BY THE HEATING SPECIALIST DHC 23 Overview of further operating parameters DHC 23-1 Programming switch 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. -
Page 21: Overview Of Further Operating Parameters Dhc
DHC 23 SERVICE BY THE HEATING SPECIALIST Overview of operating parameters DHC 23-2 Programming switch Turn programming switch into auto position.. Different values can be displayed by turning the service switch into the positions 0 ... F (see Table). The parameters can then be changed with the aid of the push and turn knob. -
Page 22: Overview Of Further Operating Parameters Dhc
SERVICE BY THE HEATING SPECIALIST DHC 23 Overview of further operating parameters DHC 23-2 Programming switch 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.. -
Page 23: Overview Of Operating Parameters Dhc
DHC 23 SERVICE BY THE HEATING SPECIALIST Overview of operating parameters DHC 23-3 Programming switch Turn programming switch into auto position. Different values can be displayed by turning the service switch into the positions 0 ... F (see Table). The parameters can then be changed with the aid of the push and turn knob. -
Page 24: Overview Of Further Operating Parameters Dhc
SERVICE BY THE HEATING SPECIALIST DHC 23 Overview of further operating parameters DHC 23-3 Programming switch 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... -
Page 25: Sensor Detection
The DHC 23 detects which inputs are occupied, i.e. which sensors are connected and automatically adopts the type of control to them. Maintenance and cleaning The DHC 23 is maintenance-free. The unit can be cleaned on the outside with a damp (not wet) cloth. What to do if it becomes too warm? -
Page 26: What To Do If It Does Not Become Warm
Select the operating mode on the DHC 23 or, if present, on the remote control TF 26. For daily heating at this time, change the switching times of the DHC 23, see Chan- ge switching times section Check the fuse and separate switch on or for the pump. If fuse and switch in order, call Pumps does not run although the heating specialist.. -
Page 27: Error Messages Of The Dhc 23
DHC 23 TROUBLESHOOTING Error messages of the DHC 23 Sensor defects such as line breaks or short-circuits are detected automatically if the Installation chapter was followed exactly during installation. If the service switch is at ⁄ position 0 and the programming switch at auto, the display flashes in the case of error and at the same time an error number instead of the weekday display. -
Page 28: Remote Control Tf 26
The setting of the remote control TF 26 is added to the setting on the DHC 23. For instance, if 19°C is set as setpoint on the DHC 23 and +2 K on the remote control, then an effective setpoint of 21°C results. -
Page 29: Technical Data
DHC 23 TECHNICAL DATA Technical data Control system Microprocessor control with analogue operation Type designation DHC 23 Order designation DHC 23-1: One heating circuit, optionally one domestic hot water circuit DHC 23-2: One mixed heating circuit, optionally one unmixed heating circuit,... - Page 30 Honeywell NTC 20 kΩ series Remote setpoint unit TF 26 Outputs Floating outputs depending on DHC 23 type: One floating output for primary District Heating valve actuator (relay 230 Vac; 0.6 A) Second floating output for valve actuator (relay 230 Vac; 3 (1) A) DHC 23-3 only: The second valve actuator output can either be floating (relay) or modulating (2–10 V),...
- Page 31 Home and Building Control Products Honeywell AG Böblinger Strasse 17 D-71101 Schönaich Phone: (+49) 70 31 6 37- 01 Fax: (+49) 70 31 6 37- 493 http://europe.hbc.honeywell.com EN2B-160 GE51R0999 Subject to change without notice. Printed in Germany...