Honeywell DHC 23 Operating Instructions Manual
H
DIGITAL DISTRICT HEATING CONTROLLER DHC 23
FOR ORIGINAL EQUIPMENT MANUFACTURERS
OPERATING INSTRUCTIONS
CONTENTS DHC 23
Short description 1
Safety notes 2
Operating elements 5
Operation by the user 6
Select operating mode 6
Select temperatures 7
LCD display 8
Adjustment by the user 9
Programming switch 9
Push and turn knob 9
Change switching times 10
Delete switching times 11
Service by the heating specialist 12
Basic settings 12
General functions and operating parameters 12
Special functions and operating parameters for DHC 23-1 14
Special functions and operating parameters for DHC 23-2 15
Special functions and operating parameters 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
Overview of further operating parameters DHC 23-3 22
Troubleshooting 23
Sensor detection 23
Maintenance and cleaning 23
What to do if it becomes too warm? 23
What to do if it does not become warm? 24
Error messages of the DHC 23 25
Remote control TF 26 26
Connection for remote control TF 26 26
Technical data 27
DHC 23 SHORT DESCRIPTION
■■
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.
Properties of the DHC 23
Main functions
Simple Operation
Simple setting
Simple commissioning
Service freindliness
n Outside temperature compensated time-dependent flow temperature control
n Domestic hot water temperature control
n Heat-up optimization
n Demand dependent pump switching
n Automatic 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 to 22.00,
the heating is on from 6.00 to 22.00.
All essential operating parameters can be displayed and changed simple.
1
SAFETY NOTES DHC 23
Outside temperature compensated
flow temperature control
Heat-up optimization
Night-time cut-off
Frost protection function
Sensor detection
Domestic hot water priority
Maximum limitation of the district
heating return temperature
Interval flushing
■■
The flow temperature is controlled according to the heat requirement high enough so
that the wanted setpoints of the domestic hot water and of the room temperature are
reached. The room temperature can be regulated accurately using the thermostats
fitted to the radiators.
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.
The room temperature is lowered to a programmable value (night setpoint) in the night
during the heating period.
The pipelines are protected against freezing in that if there is a risk of frost, the heating
water circulates. The frost protection function is always active.
The connected sensors are detected and the type of control set to them automatically.
Sensor defects such as line breaks or short circuits are displayed.
The domestic hot water priority guarantees that the domestic hot water 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 10 minutes when heat is
required.
Automatic funktions of the DHC 23
Automatic pump preventive
maintenance operation
Summer/winter time change
Data protection
2
To avoid the heating circuit pump seizing, it is switched on daily for 1 minute.
The change from summer to winter time is automatic exactly at the correct time.
All data are protected by a battery against a power failure.
Further information on the functions and operating parameters is provided in the
Service by the heating specialist chapter.
DHC 23 SAFETY NOTES
■■
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.
■■
1. The district heating system must be ready and filled with water so that the pumps
do not run dry.
2. The control device must be installed according to the installation instructions.
3. All electrical connections (power supply, valve actuators, pumps, sensor wiring, 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 are fulfilled (have them checked by the heating
specialist), the controller can be put into service.
The current time and date are already set in the factory and protected by a battery.
The timer works according to a basic program and the control functions are preset for
customary district heating systems.
Purpose
Prerequisite for commissioning
3
SAFETY NOTES DHC 23
!
⁄
Manual mode
Temperature setting on the DHC 23
!
Data protection
Frost protection function
⁄
■■
Note that in the following cases there is a risk of scalding at all domestic hot water
taps (kitchen, bathroom, etc.)! In these cases mix sufficient cold water.
In the manual mode, the domestic hot water can be heated up to the maximum
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).
Temperature setting on the DHC 23 The domestic hot water temperature can be
set on the DHC 23 up to 75 °C
■■
The battery for protecting all individual data is otherwise loaded and must be replaced
prematurely.
The frost protection function of the DHC 23 is otherwise put out of operation.
Domestic hot water temperature above 60 °C
Do not separate the DHC 23 from the power supply
4
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:
2nd operating level:
■■
In this level the user sets the basic heating functions. The operating elements required
for this are fitted on the front.
Operating mode switch:
The operating mode of the DHC 23 can be selected with the operating mode switch
(e.g. "Normal operation").
Room temperature set knob:
The room temperature can be selected with this knob.
Domestic hot water temperature set knob:
The domestic hot water temperature can be selected with this knob.
■■
In this level the user can make an individual change to the basic factory setting.
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)
change the heating times or the times of domestic hot water readiness..
Operation by the user
Adjustment by the user
3rd operating level:
■■
In this level the service personnel can perform service and maintenance work. The
operating element required for this, the service switch, is fitted behind the cover.
Service switch
With the service switch, the service personnel (in combination with the programming
switch) can check and change the operating parameters of the DHC 23.
Service by the heating specalist
5
OPERATION BY THE USER DHC 23
Operating mode switch
■■
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. The set room temperature is assured at the set heating
times.
The domestic hot water has the set temperature in the times of domestic hot
water readiness.
Off mode
Heating and domestic hot water readiness are switched off. Frost protection for
the heating system is active. If there 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.
Select operating mode
6
Manual mode
For commissioning or for emergency operation.
Heating and domestic hot water are in uncontrolled continuous operation.
The pumps can be switched on and off provided a switch is fitted to the pumps.
The valve can be adjusted arbitrarily manually.
Domestic hot water readiness
Only domestic hot water readiness is switched on corresponding to the set
switching times. The heating is not on.
This setting is intended for the summer months.
DHC 23 OPERATION BY THE USER
!
⁄
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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.
In the normal operating mode, the set room temperature is maintained during the
set heating times, in the continuous heating mode constantly.
If you want to heat outside the set heating times, you must set the operating mode
switch to .
If you do not want to heat within the set heating times, you must set the operating mode
switch to or .
Select domestic hot water temperature
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 reaching a switching difference (+ 5 K).
In the normal mode, continuous heating mode and domestic hot water rea-
diness modes, this temperature is controlled during the set times of domestic hot
water readiness, domestic hot water heating is switched off in between.
If you want to have domestic hot water at other times (e.g. early in the morning), you
must change the times of domestic hot water readiness (see Adjustment by the
user chapter).
Select temperatures
7
OPERATION BY THE USER DHC 23
■■
Weekday current
(2 =Tuesday) time
If the operating mode switch is at auto, and you have not changed the switching times
set in the factory, the bars extend from 6.00 to 22.00. This means that the heating is on
continuously from 6.00 to 22.00.
LCD display
Heating is on continuously from 6.00 to 22.00
Bars of the heating times of the current day:
1 bar = 30 minutes heating
The weekday and the current time appear on the left below.
1 = Mo … 7 = Su
8
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.
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 (no triangular symbol).
The heating circuit pump is working.
The domestic hot water charging pump(s) works (work).
Caution: The DHC 23 has detected an error (see Error messages of the
DHC 23 section).
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