Samson Trovis 5475-2 Mounting And Operating Instructions
Automation System TROVIS 5400
Heating and District Heating Controller
TROVIS 5475-2
®
Electronics from SAMSON
Fig. 1 ⋅ TROVIS 5475-2
Edition January 2001
Firmware Version
1.10
Mounting and operating instructions
EB 5475-2 EN
Contents
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Page
1. General
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.1 Notes for the user . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.2 Technical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.3 Sensor resistance values . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2. Installation
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.1 Installing the controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2.2 Installing the sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3. Electrical connections
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.1 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
3.2 Connecting the controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.3 Connecting the sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.4 Terminal wiring diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
4. Description of the controller functions
. . . . . . . . . . . . . . . . . . . . . . 13
4.1 Optimize . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.2 Adaptation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4.3 Reduced operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.4 Summer time operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4.5 Automatic clock reset summer time/winter time . . . . . . . . . . . . . . . . . . 15
4.6 Public holidays and vacations . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.7 Delayed outdoor temperature adaptation . . . . . . . . . . . . . . . . . . . . 15
4.8 Limitation of the return flow temperature . . . . . . . . . . . . . . . . . . . . . 16
4.9 Limitation of the system deviation for OPEN signal . . . . . . . . . . . . . . . . 17
4.10 Forced charging of the drinking water storage tank . . . . . . . . . . . . . . . . 17
4.11 Thermal disinfection of the drinking water storage tank . . . . . . . . . . . . . . 17
4.12 Frost protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
4.13 Defective sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.14 Forced operation of the pumps . . . . . . . . . . . . . . . . . . . . . . . . . 18
4.15 Limitation of flow rate or capacity . . . . . . . . . . . . . . . . . . . . . . . . 19
5. System descriptions and diagrams
5.1 System code number 1.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
5.2 System code number 2.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
System code number 2 .0 with changeover valve . . . . . . . . . . . . . . . . . 21
System code number 2.1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
5.3 System code number 3.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
5.4 System code number 4.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
System code number 4 .1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
System code number 4.2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.5 System code number 5.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.6 System code number 6.0 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
2
. . . . . . . . . . . . . . . . . . . . . . . 20
6. Operation
6.1 Operating controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2 Selecting the operating modes . . . . . . . . . . . . . . . . . . . . . . . . . 32
6.2.1 Remote controlling the heating system . . . . . . . . . . . . . . . . . . . . . 33
6.3 Control levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3.1 Configuration level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3.2 Parameter level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
6.3.3 Operating level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Increasing/decreasing the room temperature
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
. . . . . . . . . . . . . . . . . 37
7. Starting up and configuring the controller
7.1 Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1.1 Setting the code number . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
7.1.2 Setting the system code number (Anl) . . . . . . . . . . . . . . . . . . . . . 39
7.1.3 Setting the function blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
7.1.4 Function block list . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
7.1.4 Sensor calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
7.2 Parameterization . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.1 Resetting to default values . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
7.2.2 Entering and modifying user data . . . . . . . . . . . . . . . . . . . . . . . 48
Entering current time and date . . . . . . . . . . . . . . . . . . . . . . . . . 48
Entering parameters for heating circuit:
Heating characteristics and temperatures . . . . . . . . . . . . . . . . . . . 48
Time schedule for heating . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Public holidays . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Vacations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Entering parameters for drinking water circuit:
Temperatures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Time schedule for drinking water heating . . . . . . . . . . . . . . . . . . . . 56
Time schedule for circulation pump . . . . . . . . . . . . . . . . . . . . . . 56
7.3 Personal code numbers, locking the mode switch for manual operation and
enabling the write protect function for the configuration level . . . . . . . . . . 57
7.4 Configuring the correction switch . . . . . . . . . . . . . . . . . . . . . . . 58
. . . . . . . . . . . . . . . . . . . 38
8. Data transfer using memory module
9. Configured data
Assembly, start-up and operation of the device may only be performed
by trained and experienced personnel familiar with this product. Proper
!
shipping and appropriate storage are assumed.
The controller is designed for use in power installations. For connection
and maintenance you are required to observe the relevant safety regulations.
. . . . . . . . . . . . . . . . . . . . . 59
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
3
1. General
The heating and district heating controller is designed for weather-compensated flow temperature control. This means it controls the flow temperature of a heating system based on a heating
characteristic so that the room temperature is always maintained at the desired level regardless
of the outdoor temperature. When used as a district heating controller, the controller can limit
the return flow temperature variably according to the outdoor temperature.
A drinking water heating system may be operated from the primar y heating circuit, using a second control loop, or from the secondary heating circuit.
A differential temperature control featuring a meter tracking the operating hours of the solar
circuit pump is included in three system configurations for the solar heating of drinking water
storage tanks.
The connected sensors allow the controller to measure the respective temperatures which are
transmitted to the central signal processing system. Subsequently, this system issues a three-step
or on/off control signal corresponding to the preset set points for each of the two control loops.
In addition, the controller controls the heating circulation pump and the pumps for drinking
water heating. The signal from a heat meter that is proportional to the flow rate or capacity can
be connected to a pulse or current input. This enables the limitation of a maximum and/or minimum flow rate or capacity.
These mounting and operating instructions are valid for:
Firmware version 1.0 upwards
(The firmware version installed appears for 2 seconds in the display when the controller is
switched on)
Whats new compared to the previous version?
The circulation pump ZP runs on a time schedule in all systems.
1.1 Notes for the user
The installation of the controller and its electrical connection described in the following and,
must be carried out by authorized personnel only.
The settings for configurations described in chapter 7.1 also require specialized knowledge of
heating systems and should only be performed by an expert. This also applies for the description of the controller functions and system configurations described in chapter 4 and 5.
The start-up of the controller is normally carried out by authorized personnel all configuration
data should be entered into the configured data tables in chapter 9.
The controller is programmed with default temperature values and time schedules that can be
changed on start-up or by the user at a later date over the menu described in chapter 7.2.2.
The settings for the end user
and non-expert should be restricted to changing the heatings flow
temperature to increase or decrease room temperatures (chapter 6.3.3 on page 37) and
changing the set times-of-use (chapter 7.2.2 on page 51).
The current time and date are saved in memory for at least 24 hours when the controller is
left unconnected to the power supply. Other configuration data are stored in memory indefinitely and cannot be lost.
4
1.1 Technical data
Inputs
Sensor inputs Max. 7 PTC and Pt 100 or NTC and Pt 100, or Pt 1000 and Pt
100 sensors
2-wire circuit
(heating circuit/drinking water circuit)
2 flow temperature sensors, alternatively 1 solar collector sensor
1 room temperature sensor
1 outdoor temperature sensor
1)
1 return flow temperature sensor ( 2 in system code no. 4)
2 storage tank temperature sensors
Binary inputs Storage tank thermostat
Additional inputs Current input 4(0)...20 mA for flow rate limitation or pulse
counting input for limitation of capacity or flow rate
Current input 4(0)...20 mA for outdoor temperature
Remote control option for correcting flow temperature and
selecting the operating mode
Outputs
Control signal y Three-step signals: max. load 250 V AC, 2 A;
min. 10 mA, varistor suppression 300 V
On/off signal: max. load 250 V AC, 2 A;
min. 10 mA, varistor suppression 300 V
Binary outputs Max. 4 outputs for pump control
Load: max. 250 V AC, 2 A min. 10 mA, varistor
suppression 300 V
Control parameters K
= 0.1...50; Tn = 1...999 s; valve transit time Ty = 15...240 s
p
Operating voltage 230 V AC (+10 %/15 %), 48 to 62 Hz,
Power failure: All parameter and configuration data are saved
in an EEPROM.
Power consumption Approx. 1.5 VA
Temperature range Operation: 0...40 Storage: 20 to 60 °C
1)
Degree and class of protection IP 40 according to IEC 529 and II according to VDE 0106
Degree of contamination 2 according to VDE 0110
Overvoltage category II according to VDE 0110
Humidity rating F according to VDE 40040
Noise immunity Corresponding to EN 50082 Part 1
Noise emission Corresponding to EN 50081 Part 1
Weight approx. 0.5 kg
1)
On using Pt100 or Pt100 resistance thermometers, permissible temperature
range down to −65 °C, however, display only indicates down to −40 °C
5
CAUTION
Safety features such as frost protection monitoring and excess temperature protection are not
active in the following cases:
Defective heating controller and failure of its functions
•
Sensors are faulty, not connected or have not been deactivated
•
No power supply to the controller
•
Mode switch set to manual operation
•
1.2 Sensor resistance values
Resistance thermometer with PTC measuring element
Sensors for outdoor temperature Type 5224, for flow and return flow temperature Types 5264
and 5265, for storage tank temperature Type 5264, sensor for room temperature with remote
control Type 5244
°C 20 10 0 +10 +20 +25 +30 +40 +50 +60 +70 +80 +90 +100 +110 +120
Ohm 694 757 825 896 971 1010 1050 1132 1219 1309 1402 1500 1601 1706 1815 1925
Room temperature
sensor with remote
control Type 5244
Switch position "clock", terminals 1 and 2 °C +10 +15 +20 +25 +30
Ohm 679 699 720 741 762
Resistance thermometer with Pt 100 measuring element
Sensors for outdoor temperature Type 5225, for flow and return flow temperature Types 5204
and 5205-47, for storage tank temperature Types 5205-46 and 5205-48, sensor for room temperature Type 5255
°C -35 -30 -25 -20 -15 -10 -5 0 5 10
Ohm 86.25 88.22 90.19 92.16 94.12 96.09 98.04 100.00 101.95 103.90
°C15202530354045505560
Ohm 105.85 107.79 109.73 111.67 113.61 115.54 117.47 119.40 121.32 123.24
°C 65 70 75 80 85 90 95 100 105 110
Ohm 125.16 127.07 128.98 130.89 132.80 134.70 136.60 138.50 140.39 142.29
°C 115 120 125 130 135 140 145 150
Ohm 144.17 146.06 147.94 149.82 151.70 153.58 155.45 157.31
Resistance values with Pt1000 measuring element
Use the resistance values in the table for the Pt100 and multiply the values by the factor of 10.
Sensor for outdoor temperature Type 5227, for flow and return flow temperature Types 5207-
21, 5207-27, 5277 (thermowells required) and Type 5267 (surface sensor),
for storage tank temperature Type 5207-46 and Type 5207-48,
sensor for room temperature Type 5257-1,
room temperature sensor with remote control Type 5257-4.
6
2. Installation
2.1 Installing the controller
The controller is made up of the controller casing which contains the electronics components
and the rear casing section with the terminal blocks. To connect the controller, remove the screws
on the front panel and separate the controller housing from the rear casing.
For wall mounting, use four screws to mount the rear casing to a wall. The distances between the
holes are shown in Fig. 2.
For top hat rail mounting, mount the controller onto the top hat rail using the spring-mounted
hook on the rear casing.
For panel mounting, push the controller casing through the panel cut-out (92 x 138 mm) and insert the fastening clips (delivered with the controller) into the notches at the top and bottom of
the casing. Then turn the threaded bolts in the direction of the control panel so that the casing is
pressed with its front frame against the control panel.
Fixing screw on controller section
30 10
98
144 59
138
57 41
15
Ø 4.5
62
93
Panel cut-out
92 x 138 mm
Fig. 2 ⋅ Dimensional diagram
Fastening section on controller rear casing
7
2.2 Installing the sensors
2.2.1 Outdoor sensor
Use two screws to mount the outdoor sensor to the outside wall at an appropriate place. Make
sure that the sensor is mounted away from direct heat sources (windows, vents etc.). In case of
single family dwellings, preferably mount the sensor on the wall at the side of the house where
the most frequently occupied rooms are situated.
2.2.2 Flow/return flow sensor
Mount the sensor as duct sensor or surface sensor in an easily accessible location near the control valve:
Duct sensor:
Surface sensor:
polish the pipe clean. Firmly press the sensor onto the pipe and secure it to the pipe using the enclosed tightening strap.
2.2.3 Room sensor
Mount the sensor on the wall approx. 150 cm above the floor at an appropriate place. Make
sure that the air circulation is not obstructed by cupboards, curtains or similar items.
3. Electrical connections
3.1 General
!
Use separate cables for 230 V supply line and the signal lines!
•
Also use separate cables for the digital signal lines (bus lines) and the analog signal lines
•
(sensor lines).
Insert the duct sensor into a thermowell as far as it will go.
Remove insulation from the flow pipe where the sensor is to be mounted and
CAUTION!
For wiring and connection of the controller, you are required to observe the VDE
regulations and the regulations of the local power supply company. For this reason,
this type of work must be carri ed out b y a spec ia list.
In systems with a high electromagnetic noise level, we recommend that shielded cables be
•
used for the analog signal lines.
Ground the shield at the inlet or outlet of the control cabinet, using the largest possible cross
section and via the shortest possible route.
The central grounding point must be connected to the grounding conductor using a min.
10 mm
As a rule, the shield needs only be grounded on one side at the control cabinet inlet, except
when an equipotential bonding exists that has much lower resistance than the shield resistance.
To increase the noise immunity, make sure that there is a minimum distance of 10 cm be-
•
tween the power cables and signal lines. We recommend that this distance between these
lines is also kept in the control cabinet!
Inductances in the control cabinet, e.g. contactor coils, must be equipped with suitable inter-
•
ference suppressors (RC elements)!
Control cabinet elements with a high field strength, e.g. transformers or frequency converters, should be shielded by means of separators that have good chassis ground.
8
2
cable.
Surge protection
The following measures must be taken if lines are installed outside of the building or over long
distances:
The shield of signal lines routed outside of buildings must have current carrying capacity
•
and must be grounded on both sides.
Surge diverters must be installed at the control cabinet inlet.
•
3.2 Connecting the controller
Connect the controller on the basis of the relevant terminal diagrams of the associated system
code numbers (Fig. 3 to 10).
The power supply section of the controller terminals 14 to 26 must be connected using wires
with a cross-section of 1.5 mm
2
at the minimum.
Knock out the holes marked on the rear casing for the cable entries and insert the enclosed selfsealed grommets or suitable glands.
3.3 Connecting the sensors
Connect the cables with a cross-section of min. 0.5 mm
2
to the terminal strip terminals 1
to 13 on the rear casing. See chapter 7.1.4 for Pt100 (Pt1000/PTC) on sensor calibration.
3.4 Terminal wiring diagrams
Legend for circuit diagrams:
AF Outdoor sensor SLP Storage tank charging pump
RF Room sensor UP Circulation pump of heating circuit
RÜF Return flow sensor ZP Circulation pump of drinking water circuit
SF Storage tank sensor WMZ Heat meter
VF Flow sensor Solar circuit:
TW Drinking water circuit CF Solar circuit collector sensor
HK Heating circuit CP Solar circuit pump
2 PKT On/off
With 0 …20 mA
50 Ω connect in parallel
Fig. 3
System code no. 1
Option Type 5244
Type 5257-4
9
Thermostat
Changeover
valve
With 0 …20 mA
50 Ω connect in parallel
Fig. 4
System code no. 2.0
With 0 …20 mA
50 Ω connect in parallel
Fig. 5
System code no. 2.1
Option Type 5244
Type 5257-4
Stage1
Stage 2
Option Type 5244
Type 5257-4
Wit h 0 …20 mA
50 Ω connect in parallel
Fig. 6
System code no. 3.0
10
Thermostat
Option Type 5244
Type 5257-4
Wit h 0 …20 mA
50 Ω connect in parallel
Fig. 7
System code no. 4.0
Wit h 0 …20 mA
50 Ω connect in parallel
Fig. 8
System code nos. 4.1,
4.2
Option Type 5244
Type 5257-4
Option Type 5244
Type 5257-4
Wit h 0 …20 mA
50 Ω connect in parallel
Fig. 9
System code no. 5.0
Thermostat
Option Type 5244
Type 5257-4
11
* Fast-reacting
sensor/actuator
With 0 …20 mA
50 Ω connect in parallel
Fig. 10
System code no. 6.0
Option Type 5244
Type 5257-4
12
4. Description of the controller functions
The following function descriptions are intended to help you understand the settings required for
operation.
The controller functions depend on the selected system code numbers (1 to 6). See chapter 5 for
details.
4.1 Optimize
The controller is capable of automatically determining the most favorable times for activation/deactivation of the heating system in periodically occupied buildings. To activate this function, select function block setting FB 0 = ON (linked to FB 13 = ON).
In contrast to the reduced operation, the heating system is deactivated at the latest when the
time of non-use starts. A reference room with an installed room temperature sensor is monitored in place of the entire building. Whenever the room temperature falls below an adjustable
Sustained temperature, the controller activates the heating until the temperature exceeds the
sustained temperature (plus approx. 0.5°C differential gap) again. To achieve this, the system
can be run at the maximum permissible flow temperature.
The controller determines when the heating should be activated to start rated operation of the
system so that the Room temperature set point (temperature adjustable at the controller) is just
reached when the set time-of-use begins. The heating may be activated up to 6 hours before the
set time-of-use begins (this is the case on start-up as the controller has not yet stored any information concerning the building characteristics).
Drinking water is not heated in system code numbers 2 and 3 during the preheating time. The
controller determines when the heating is to be deactivated so that the temperature does not fall
significantly below the desired room temperature towards the end of time-of-use due to the
heating being deactivated before the time-of-use ends (e.g. direct sunlight can cause an increase in room temperature, especially if the flash adaptation is not used, and this in turn leads
to the system being deactivated too soon). The heating may be deactivated up to 2 hours before
the set time-of-use ends.
If 2 rated operation times are set for one day, the controller does not monitor the Sustained temperature, but a Reduced room temperature set point (the temperature adjustable at the controller) between both time blocks.
4.2 Adaptation
The controller is capable of automatically adapting the heating characteristic to the building
characteristics. Based on the default heating characteristic (gradient value 1.8), a reference
room with an installed room temperature sensor is monitored in place of the entire building. If
the measured room temperature deviates from the adjustable Room temperature set point on
the average during the time-of-use when the mode switch is set to , the subsequent rated
operation time is based on the altered heating characteristic gradient, provided the function
block setting is set to FB 1 = ON. The corrected value is displayed in the parameter level as
Gradient of the heating; this parameter cannot be accessed to change it manually when the
adaptation mode (FB = 1) is selected.
Immediate responses to deviations in room temperature can be achieved using the function
block setting FB 2 = ON: the flash adaptation compensates for deviations in room temperature
during time-of-use when the mode switch is set to , by lowering or raising the heating characteristic by up to 30 °C (parallel displacement of the heating characteristic). Combined with
adaptation mode (FB 1 = ON), a maximum displacement of 5 °C is designated.
13
The displacement is displayed as Level of the heating characteristic; this parameter cannot be
accessed to adjust it manually when the flash adaptation mode (FB 2 = ON) is selected.
The options on the controller and remote control to correct the set point apply to the room temperature set point in adaptation/flash adaptation mode.
4.3 Reduced operation
In reduced operation, the heating circuit generally operates on a flow temperature set point
value defined by the heating characteristic and reduced by the value set under Set-back of flow
temperature for reduced operation. If, however, during times of non-use, the outdoor temperature exceeds the value entered as the Outdoor temperature limit value for deactivation in reduced operation, the controller automatically deactivates the heating system by closing the
control valve, and the heating circulation pump UP is deactivated after the set lag time has
elapsed. If the outdoor temperature falls below the limit value (approx. 0.5 °C differential
gap), the heating system immediately starts operating again.
If the outdoor temperature falls below the Outdoor temperature limit value for reactivation of
rated operation in reduced operation during times of non-use, the value set under Set-back of
flow temperature for reduced operation is ignored: the flow set point for rated operation is
used.
4.4 Summer time operation
In summer time operation, the controller automatically deactivates the heating system, by closing the control valve and the heating circulation pump UP is switched off after the set lag time
has elapsed.
The outdoor temperature is the decisive factor for the start of summer time operation. If it exceeds the parameter Outdoor temperature limit value for summer time operation (default setting: 22 °C; setting range: 0...50 °C), summer time operation is directly activated.
When this limit value (approx. 0.5 °C differential gap) is not reached, the heating immediately
starts operating again.
The Time-controlled summer time operation function is linked to the setting the function block
FB 3 = ON and only activated when the mode switch is set to .
The decisive factors for time-controlled summer time operation to become active are:
The current date. If it lies within the effective time period of summer time operation
(settings in the configuration level linked to the function block setting FB 3 = ON. Default:
01.06. to 30.09.)
The daytime mean temperature (measured between 7:00 and 22:00 hrs) exceeds the out-
door temperature limit value on the corresponding number of subsequent days
(settings in the configuration level linked to the function block setting FB 3 = ON. Default:
outdoor temperature limit value 18 °C setting range 0 to 30 °C and 2 days to activate
the time-controlled summer time operation setting range 1...3)
14
If the time-controlled summer time operation is active, heating operation will not start even at
lower outdoor temperatures when the t ime- of-u se st ar ts.
The time-controlled summer time operation is only deactivated when the daytime mean temperature falls below the outdoor temperature limit value on the corresponding number of subsequent days.
(Setting in the configuration level linked to the function block setting FB 3 = ON. Default: 1 day
to deactivate the time-controlled summer time operation setting range 1...3)
If the heating system is also deactivated due to the parameters Outdoor temperature limit value
for summer time operation and the Time-controlled summer time operation, the heating is not
reactivated when the temperature falls by approx. 0.5 °C below the values in the above mentioned parameters.
Info display about the time-controlled summer time operation.
If the display of the outdoor temperature is selected (function block FB 3 = ON) in the operating
level when the summer time operation is activated and the key is held down, the daytime
mean temperature is displayed.
The bars at the top of the display show the temperature curve over the past 8 days. The black
areas show where the temperature exceeded the limit value and the empty areas where the temperature fell below the limit value. A black area marked 1, for example, means that the outdoor
temperature limit was exceeded on average on the previous day.
4.5 Automatic clock reset summer time/winter time
When you set the function block FB 5 = ON, the controller automatically resets the clock on the
last Sunday in March from 2:00 to 3:00 hrs and on the last Sunday in October from 3:00 to
2:00 hrs.
4.6 Public holidays and vacations
The controller lets you define 20 public holidays and 10 vacation periods (parameter level).
There is no default setting for public holidays.
On public holidays, the heating system operates based on the data entered for Sundays (heating time schedule); during vacations, the heating runs in reduced or standby operation.
The drinking water heating is not affected by public holidays and vacations when the controller
operates using default settings. When you activate the function block FB 6 = ON, the drinking
water heating will then operate on public holidays using the same time schedule entered for
Sundays (time schedule for drinking water heating). Subsequently, the drinking water heating is
then not active during vacations (frost protection monitoring from +5 °C downwards).
4.7 Delayed outdoor temperature adaptation
This function is used to determine the flow temperature set point using a calculated outdoor temperature which is delayed either:
a) only when the outdoor temperature decreases, or
b) regardless of the outdoor temperature.
For instance, if the outdoor temperature varies by 12 °C within a very short time , the Calcu-
lated outdoor temperature is adapted to the outdoor temperature in small steps over a time
period of 4 hours with a delay setting of 3 °C/hr. This function helps to prevent heating system
overloads in combination with overheated buildings, or temporarily insufficient heating due to
short-term outdoor temperature variations, e.g. caused by warm winds or excessive solar radi-
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ation on the outdoor temperature sensors.
An active delayed outdoor temperature adaptation is signalized in the operating level by a
blinking outdoor temperature in the display. When you keep key pressed down, the Calculated outdoor temperature is shown in the display.
If the function Time-controlled summer time operation (FB 3 = ON) is activated, the calculated
outdoor temperature is not indicated in the display.
4.8 Limitation of the return flow temperature
For an economical operation of a district heating system, it is required that as much heat as
possible be extracted from the heat transfer medium (water) circulating through the system. The
difference in temperature between the flow and return flow in the network is used to indicate
how much energy is being consumed: a large difference in temperature indicates a high level of
energy efficiency and a small difference indicates a low level of energy efficiency. One return
flow temperature sensor is sufficient to evaluate the difference in temperature when the flow
temperature in the network is predetermined.
The function is as follows: the return flow temperature can either be limited depending on the
outdoor temperature (variable) or by a fixed value. If the return flow temperature measured at
the return flow sensor RüF1 exceeds the limit value calculated from the set return flow characteristic or the fixed limitation value by the value x, the respective calculated or fixed set point
(flow temperature of heating, charging temperature) is reduced by the value x, multiplied by return flow temperature limitation factor. As a result, the primary flow rate is reduced with the effect that the return flow temperature drops. Both the measured value of the Return flow temperature and the set point (flow temperature of heating, charging temperature) blink in the display when a limitation case occurs. The function is already activated by the function block setting FB 20 = ON.
In system code numbers 2 and 3 (drinking water heating implemented in the secondary circuit),
the controller switches during the heating up of drinking water over to the parameter Return
flow limitation temperature during drinking water heating from the return flow temperature
limitation value (calculated from the return flow temperature limitation characteristic). This ensures that the return flow limitation temperature in the heating circuit can be held low in the seasonal interim period.
In system code number 4, a separate return flow temperature limitation in the drinking water
circuit is additionally possible, provided FB 21 = ON.
System code number 5 allows you to include the return flow temperature of the drinking water
circuit. For this purpose, the return flow temperature sensor must be mounted in a return flow
pipe used in both circuits, and the function block FB 21 must be activated (ON). When FB 21 is
activated (ON), the parameter Return flow limitation temperature during drinking water heating (the temperature is adjustable at the controller) is activated. When drinking water is being
heated, the highest value from both return flow temperature limitation values (heating circuit
and drinking water circuit) is used for the limitation control. When a limitation occurs, both the
set point in the heating circuit and the set point in the drinking water circuit are reduced. If the
priority for drinking water through set-back operation is additionally activated (FB 8 = ON, setting "Ab"), the reduced heating circuit set point is also further reduced when a limitation occurs!
In system code number 6, a return flow temperature limitation is only possible in the heating circuit.
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4.9 Limitation of the system deviation for OPEN signal
When using the controller for steam pressure control, we recommend that you activate this function. It limits the controllers reaction to set point deviations which cause the control valve to
open. This makes it much easier to start up such systems without complications. The controllers
response to set point deviations which cause the control valve to close are not affected by this
function.
In the system code numbers 1, 2 and 3, the function must be activated via FB 11 = ON.
In the system code numbers 4, 5 and 6 set
FB 11 = ON to activate the function linked to the heating circuit, and
FB 12 = ON to activate the function linked to the drinking water circuit.
4.10 Forced charging of drinking water storage tank
Systems 2, 3 and 5 are equipped with this function as standard, provided that a storage tank
sensor (not a storage tank thermostat) is used.
To guarantee sufficient charging of the drinking water storage tank at the time when the rated
operation of the heating circuit begins (or when the preheating period in the optimize mode
begins), forced charging commences one hour before the time-of-use set of the heating circuit
begins (or one hour before the preheating period in the optimize mode), provided that the timeof-use of the drinking water circuit does not end as the time-of-use the heating circuit starts.
The drinking water heating finishes as usual when the temperature Drinking water heating
OFF is reached.
4.11 Thermal disinfection of the drinking water storage tank
This function cannot be used in conjunction with a storage tank thermostat.
The thermal disinfection is first activated by the function block setting FB 7 = ON. You can select
whether the thermal disinfection should run on a certain day of the week or daily.
Drinking water heating is started on the days concerned at the start time set to heat up the water
to disinfect it. The thermal disinfection finishes at the stop time set at the latest.
(Settings in the configuration level, linked to function block setting FB 7 = ON. Default: week
day 3 Wednesday; start time 0:00 hrs, stop time 4:00 hrs, these times can be changed in 30
min. steps; deactivating temperature 70 °C, setting range 60 to 90 °C).
Systems 2, 3 and 5 function with a 5 °C higher deactivating temperature for charging the storage tank. In System 4, the drinking water set point corresponds to the deactivating temperature
+5 °C; however, thermal disinfection also finishes when the deactivating temperature in the storage tank is reached.
If the required temperature in the storage tank is not reached before the stop time, the thermal
disinfection procedure is interrupted. However, the return flow temperature in the drinking
water circuit is not limited by it.
A parallel pump operation selected using the parameter FB 9 = ON is not carried out during
thermal disinfection. The procedure of thermal disinfection is also not interrupted by an intermediate heating operation (systems 2 and 3). The circulation pump remains in operation contrary to the default drinking water heating in systems 2 and 4 during the thermal disinfection !
4.12 Frost protection
Generally, the heating circuit circulation pump UP is activated when the outdoor temperature
falls below +3 °C. A flow temperature set point of 10 °C is used for control.
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The drinking water circuit circulation pump ZP is likewise activated, provided that storage tank
charging is not taking place. Outside of rated operation times for drinking water heating, the
temperature of the drinking water storage tanks is additionally kept at 5 °C, provided that a
storage tank thermostat is not used. In conjunction with a storage tank thermostat, there is no
frost protection outside of rated operation times for drinking water heating.
There is no frost protection when mode switch is set to manual!
Note:
4.13 Defective sensors
symbol appears in the display
The following described controller behavior in the event of a defect refers to a definite short-circuit and clear interruption in the sensor wiring.
Safety functions such as frost protection and excess temperature protection are therefore guaranteed when a sensor fails.
Outdoor temperature sensor AF:
If the outdoor sensor is defect, the controller either regulates a flow temperature set point of 50
°C or the maximum flow temperature, provided it is smaller than 50 °C.
Flow temperature sensor VF:
If this flow sensor fails, the controller continues to operate in the
last position the valve assumed.
Flow temperature sensor for drinking water circuit VF TW, (SF1 in systems 4.1, 4.2):
If this
sensor fails, the drinking water circuit is deactivated; the control valve of the drinking water circuit remains closed.
Return flow temperature sensor RüF:
If the return flow sensor fails, the control system functions
without return flow temperature limitation.
Room temperature sensor RF:
If this sensor fails, the controller functions according to the settings for operation without room sensor, i.e. it switches from the optimize mode to reduced
operation. If the adaptation mode has been activated, the heating characteristic most recently
determined remains unchanged.
Storage tank temperature sensor SF1 and SF 2:
If one of the two sensors fails, storage tank
charging is not carried out anymore.
Sol ar cir cuit sensor SF2 and CF:
If one of the two sensors fails, the solar circuit pump is switched
off.
4.14 Forced operation of the pumps
If the pumps are not used, they are protected from blocking by forced operation. If the heating
circuit circulation pump UP, the storage tank charging pump SLP or the heat exchanger charging pump are not activated within 24 hours, they are force-operated for one minute as follows:
The circulation pump then starts at 12:00 hrs, storage tank charging pump and the heat exchanger charging pumps start at 12:01 hrs.
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4.15 Limitation of flow rate or capacity
The TROVIS 5475-2 Heating and District Heating Controller can be used in conjunction with
heat meters to limit the flow rate or capacity.
To be able to limit the flow rate based on a 0 or 4-20 mA signal issued by heat meters, the heat
meters must be equipped with high-resolution measuring technology, especially the flow
measuring element, and the signal must reflect the measured value with a delay time of less than
5 seconds, if necessary, caused by signal averaging.
You can activate/deactivate function block FB 22 = ON and FB 23 = ON to determine the signal
range (0 or 4 to 20 mA), the upper measuring range value (the flow rate flowing through the
flow measuring element at 20 mA signal), the required minimum limit value (creep feed rate)
and the maximum limit value.
When the flow rate in control operation reaches the set maximum limit value, the controller switches to flow rate control with the maximum limit value as the set point; the flow temperature control then takes over from the flow rate control when the temperature at the flow sensor VF exceeds the current set point by 5 K. In system code numbers 4 to 6, the heating circuit valve is
preferably controlled via flow rate.
When the flow rate in control operation falls below the set minimum limit value, the control valve
of the heating circuit is temporarily closed. The control operation is first started again when the
temperature at the flow sensor VF falls below the current set point by 5 K.
Alternatively, the flow rate or capacity can also be limited based on a pulse signal 3 to 500
pulse/hour from the heat meter.
The function block settings FB 22 = OFF and FB 23 = ON determine the maximum pulse rate to
be limited for the mere heating operation and for drinking water heating as well as the associated influencing factors.
Since the readout of the current pulse rate which also includes the flow rate registered in the
controller or the capacity registered in the controller is calculated as a function of the distance
in time between the incoming pulses, it is natural that sudden surges in flow rate or capacity
cannot be directly registered by the controller. This applies particularly to low pulse rates!
If the pulse rate P in control operation reaches the set maximum limit, the set point of the corresponding control loop is reduced. The severity of the intervention can be determined by changing the associated influencing factor.
In system code numbers 4 to 6, the set point of the control loop with a lower limit value is reduced in principle by the pulse rate limitation.
Determining P [pulse/hr]:
For example, if a heat meter issues one pulse per kilowatt hour (resolution = 1 kWh/pulse), the
maximum pulse rate P [pulse/hr] must be set as described below for a desired limitation to
P = 30 kW:
P [pulse/hr] = P [kW] / resolution [kWh/pulse]
P [pulse/hr] = 30 kW / 1 kWh/pulse = 30 pulse/hr
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5. System descriptions and diagrams
Introduction
The system diagrams show possible connections for safety equipment as an example. These
examples are represented by dot-dash lines.
Should a temperature regulator (TR) or safety temperature monitor (STM) or additionally a
pressure limiter (PL) be required, you must use a control valve with fail-safe action that complies
with DIN 32730.
The heating circuit must be equipped with a TR/STM combination if it is stipulated in DIN 4747
Part 1.
A Pressure Limiter (PL) must be installed if DIN 4751requires it.
You are required to install a TR/STL combination in a primary drinking water heating circuit, if
required by DIN 4753.
5.1 System code number 1.0
, only heating
Weather-compensated flow temperature control with variable limitation of the return flow temperature
Fig. 11 ⋅
(system code number 1.0)
Anl 1
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