Danfoss Termix AT BTD Thermostatic Valve
Specifications
- Model: Termix AT BTD
- Type: District heating substation with tank for domestic hot water preparation
- Mounting: Wall-mounting
- Application: Single-family houses or apartments
- Hot Water Tank: Enamelled tank with coil and magnesium anode
- Control: Self-acting thermostatic control valve
Product Usage Instructions
Functional description|
District heating substation with tank for domestic hot water preparation and with thermostatic control. Designed for wall-mounting.
Application
The Termix AT BTD substation is a complete solution for hot water. The Termix AT BTD is applicable for single-family houses or apartments.
Domestic hot water (DHW)
The domestic hot water circuit consists of a hot water tank with coil and self-acting thermostatic control valve. The hot water tank and coil are enamelled and the tank contains a magnesium anode. The substation is delivered with a built in safety valve.
Safety notes
Safety Notes – general
The following instructions refer to the standard design of substation. Special versions of substations are available on request. This operating manual should be read carefully before installation and start-up of the substation. The manufacturer accepts no liability for damage or faults that result from non-compliance with the operating manual. Please read and follow all the instructions carefully to prevent accidents, injury and damage to property. Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.
Please comply with the instructions issued by the system manufacturer or system operator.
Corrosion protection
All pipes and components are made of stainless steel and brass. The maximum chloride compounds of the flow medium should not be higher than 150 mg/l.
The risk of equipment corrosion increases considerably if the recommended level of permissible chloride compounds is exceeded.
Energy source
The substation is designed for district heating as the primary source of energy. However, also other energy sources can be used where the operating conditions allow it and always are comparable to district heating.
Application
The substation is designed to be connected to the house installation in a frost-free room, where the temperature does not exceed 50 °C and the humidity does not exceed 60%. Do not cover or wall up the substation or in any other way block the entrance to the station.
Choice of material
Choice of materials always in compliance with local legislation.
Safety valve(s)
We recommend mounting of safety valve(s), however, always in compliance with local regulations.
Connection
The substation must be equipped with features that ensure that the substation can be separated from all energy sources (also power supply).
Emergency
In case of danger or accidents – fire, leaks or other dangerous circumstances – interrupt all energy sources to the station if possible, and seek expert help.
In case of discoloured or bad-smelling domestic hot water, close all shut-off valves on the substation, inform the operating personnel and call for expert help immediately.
REACH
All Danfoss A/S products fulfill the requirements in REACH.
One of the obligations in REACH is to inform customers about presence of Candidate list substances if any, we hereby inform you about one substance on the candidate list: The product contains brass parts which contains lead (CAS no: 7439-92-1) in a concentration above 0.1% w/w.
Storage
Any storage of the substation which may be necessary prior to installation should be in conditions which are dry and heated.
Authorized personnel only
Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.
Please observe instructions carefully
To avoid injury to persons and damage to the device, it is absolutely necessary to read and observe these instructions carefully.
Warning of high pressure and temperature
Be aware of the installation’s permissible system pressure and temperature. The maximum temperature of the flow medium in the substation is 120 °C. The maximum operating pressure of the substation is 10 bar. PN 16 versions are available on enquiry. The risk of persons being injured and equipment damaged increases considerably if the recommended permissible operating parameters are exceeded. The substation installation must be equipped with safety valves, however, always in accordance with local regulations.
Warning of hot surface
The substation has got hot surfaces, which can cause skin burns. Please be extremely cautious in close proximity to the substation.
Power failure can result in the motor valves being stuck in open position. The surfaces of the substation can get hot, which can cause skin burns. The ball valves on district heating supply and return should be closed.
Warning of transport damage
Before substation installation, please make sure that the substation has not been damaged during transport.
IMPORTANT – Tightening of connections
Due to vibrations during transport all flange connections, screw joints and electrical clamp and screw connections must be checked and tightened before water is added to the system. After water has been added to the system and the system has been put into operation, re-tighten ALL connections.
Mounting
Installation must be in compliance with local standards and regulations.
District heating (DH) – In the following sections, DH refers to the heat source which supplies the substations. A variety of energy sources, such as oil, gas or solar power, could be used as the primary supply to Danfoss substations. For the sake of simplicity, DH can be taken to mean the primary supply.
Connection sizes:
All connections: G ¾” (int. thread)
Dimensions (mm):
With cover:
- 100L: H 1180 x W 540 x D 520
- 150L: H 1510 x W 540 x D 520
- Weight (approx.): 85 – 100 kg
Authorized personnel only
Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.
Termix AT BTD 5 pipes
The pipe placement can deviate from the shown drawing. Please note the markings on the station.
Termix AT BTD 4 pipes
The pipe placement can deviate from the shown drawing. Please note the markings on the station.
Installation
Mounting:
Adequate space
Please allow adequate space around the substation for mounting and maintenance purposes.
Orientation
The station must be mounted so that components, keyholes and labels are placed correctly. If you wish to mount the station differently please contact your supplier.
Drillings
Where substations are to be wall-mounted, drillings are provided in the back mounting plate. Floor mounted units have support.
Labelling
Each connection on the substation is labelled.
Before installation:
Clean and rinse
Prior to installation, all substation pipes and connections should be cleaned and rinsed.
Tightening
Due to vibration during transport, all substation connections must be checked and tightened before installation.
Unused connections
Unused connections and shut-off valves must be sealed with a plug. Should the plugs require removal, this must only be done by an authorized service technician.
Installation:
Strainer
If a strainer is supplied with the station it must be fitted according to schematic diagram. Please note that the strainer may be supplied loose.
Connections
Internal installation and district heating pipes connections must be made using threaded, flanged or welded connections.
Start-up
Start-up, Direct heating
The shut-off valves should be opened and the unit observed as it enters service. Visual checking should confirm temperatures, pressures, acceptable thermal expansion and absence of leakage. If the heat exchanger operates in accordance with design, it can be put to regular use.
After water has been added to the system and the system has been put into operation, re-tighten ALL connections.
Re-thighten connections
After water has been added to the system and the system has been put into operation, re-tighten ALL connections.
Mounting instructions Termix AT BTD wall cabinet
Mounting
Wall bracket
Mount the Wall bracket according to the Drawing. Use A to center the tank on the bracket.
B – All pipe threads are ISO ½”.
Mount the container unit in the wall bracket.
Side plates
Fasten the right and left side plates by placing the key holes over the screws on the sides of the wall bracket.
- Bottom panel
Slide the slots in the bottom panel onto the 2 bushes in the side plates, and fasten the panel with the 2 screws in the front. - Top plate
Mount the top plate. - Front cover
Mount the front cover by lowering the key holes onto the screws in the side plates. - Clock panel
Mount the clock panel by lowering the key holes onto the screws in the side plates.
Design
Design Termix AT BTD 5 pipes
Your substation might look different than the substation shown.
Design description
- E Hot water tank with coil
- S Siphon
- 1A Ball valve, DVGW
- 2 Single check valve
- 4 Safety valve
- 20 Filling/drain valve
- 41A Fitting piece, cold water mains
- 59 Differential pressure/temperature regulator with flow limiting
Schematic diagram Termix AT BTD 5 Pipes
Your substation might look different than the schematic diagram shown.
Schematic description
- E Hot water tank with coil
- 1 Ball valve
- 1A Ball valve, DVGW
- 2 Single check valve
- 4 Safety valve
- 20 Filling/drain valve
- 41A Fitting piece, cold water mains
- 59 Differential pressure/temperature regulator with flow limiting
- DHW: Domestic Hot Water
- DCW: Domestic Cold Water
- CWM: Cold water mains
- DH Supply: District Heating Supply
- DH Return: District Heating Return
Design Termix AT BTD 4 pipes
Your substation might look different than the substation shown.
Design description
- E Hot water tank with coil
- S Siphon
- 1A Ball valve, DVGW
- 2 Single check valve
- 4 Safety valve
- 20 Filling/drain valve
- 59 Differential pressure/temperature regulator with flow limiting
Schematic diagram Termix AT BTD 4 Pipes
Your substation might look different than the schematic diagram shown.
Schematic description
- E Hot water tank with coil
- 1 Ball valve
- 1A Ball valve, DVGW
- 2 Single check valve
- 4 Safety valve
- 20 Filling/drain valve
- 59 Differential pressure/temperature regulator with flow limiting
- DHW: Domestic Hot Water
- DCW: Domestic Cold Water
- DH Supply: District Heating Supply
- DH Return: District Heating Return
Technical parameters
- Nominal pressure: PN 10
- Max. DH supply temperature: T–max = 95 °C
Controls
DHW temperature control
There are various types of DHW temperature control used in Danfoss substations.
DHW temperature should be adjusted to 45-50 °C, as this provides optimal utilization of DH water. At DHW temperatures above 55 °C, the possibility of lime scale deposits increases significantly.
AB-QM controller (45–60 °)
QT is a self-acting thermostatic actuator designed to be used
as return temperature control thermostat in one-pipe heating systems.
QT is dedicated to be used with AB-QM automatic balancing & control valve.
AB-QM DN 10-20 (45-60 °C)
| Temperature setting | QT Sensor setting (turns) | |||||||
| 0 | 1 | 2 | 3 | 4 | 5 | 6 | ||
| AB-QM (flow setting) | 20 % | 48,0 | 50,5 | 53,0 | 55,5 | 58,0 | 60,5 | 63,0 |
| 30 % | 47,0 | 49,5 | 52,0 | 54,5 | 57,0 | 59,5 | 62,0 | |
| 40 % | 46,0 | 48,5 | 51,0 | 53,5 | 56,0 | 58,5 | 61,0 | |
| 50 % | 45,0 | 47,5 | 50,0 | 52,5 | 55,0 | 57,5 | 60,0 | |
| 60 % | 44,0 | 46,5 | 49,0 | 51,5 | 54,0 | 56,5 | 59,0 | |
| 70 % | 43,0 | 45,5 | 48,0 | 50,5 | 53,0 | 55,5 | 58,0 | |
| 80 % | 42,0 | 44,5 | 47,0 | 49,5 | 52,0 | 54,5 | 57,0 | |
| 90 % | 41,0 | 43,5 | 46,0 | 48,5 | 51,0 | 53,5 | 56,0 | |
| 100 % | 40,0 | 42,5 | 45,0 | 47,5 | 50,0 | 52,5 | 55,0 | |
The values are intended as a guide.
Other
Cold water meter fitting piece
The substation is equipped with a fitting piece for cold water meter.
Assembly of cold water meter:
- Close ball valves
Close the ball valves on cold water, if there is water on the system. - Loosen nuts
Loosen the nuts on the fitting piece. - Remove fitting piece
Remove the fitting piece and replace it with the cold water meter. Do not forget the gaskets. - Tighten connections
After mounting of the cold water meter remember to check and tighten all threaded connections.
Siphon
Placed the Siphon directly under the Safety valve.
Ensure that the drainpipe has a minimum internal diameter of 32mm.
Maintenance
The substation requires little monitoring, apart from routine checks. It is recommended to read the energy meter at regular intervals, and to write down the meter readings.
Regular inspections of the substation according to this Instruction are recommended, which should include:
Strainers
Cleaning of strainers.
Meters
Checking of all operating parameters such as meter readings.
Temperatures
Checking of all temperatures, such as DH supply temperature and DHW temperature.
Connections
Checking all connections for leakages.
Safety valves
The operation of the safety valves should be checked by turning the valve head in the indicated direction.
Venting
Checking that the system is thoroughly vented.
Inspections should be carried out minimum every two years.
Spare parts can be ordered from Danfoss. Please ensure that any enquiry includes the substation serial number.
Authorized personnel only
Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.
Troubleshooting
Troubleshooting in general
In the event of operating disturbances, the following basic features should be checked before carrying out actual troubleshooting:
- The substation is connected to electricity,
- The strainer on the DH supply pipe is clean,
- The supply temperature of the DH is at the normal level (summer, at least 60 °C – winter, at least 70 °C),
- The differential pressure is equal to or higher than the normal (local) differential pressure in the DH network – if in doubt, ask the DH plant supervisor,
- Pressure on the system – check the HE pressure gauge.
Authorized personnel only
Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.
Troubleshooting DHW
| Problem | Possible cause | Solution |
| Too little or no DHW. | Strainer in supply or return line clogged. | Clean strainer(s). |
| DHW circulation pump out of order or with too low setting. | Check circulation pump. | |
| Defective or clogged non-return valve. | Replace – clean. | |
| No electricity. | Check. | |
| Wrong setting of automatic controls, if any. | To adjust an electronic controller for DHW, pls. note enclosed instructions for electronic controller. | |
| Scaling of the plate heat exchanger. | Replace – rinse out. | |
| Defective motorized valve. | Check (use manual function) – replace. | |
| Defective temperature sensors. | Check – replace. | |
| Defective controller. | Check – replace. | |
| Hot water in some taps but not in all. | DCW is being mixed with the DHW, e.g. in a defective thermostatic mixing valve. | Check – replace. |
| Defective or clogged non-return valve on circulation valve. | Replace – clean. | |
| Tap temperature too high; DHW tap load too high. | Thermostatic valve adjusted to a too high level. | Check – set. |
| Temperature drop during tapping. | Scaling of the plate heat exchanger. | Replace – rinse out. |
| Larger DHW flow than the substation has been designed for. | Reduce DHW flow. | |
| Thermostatic control valve does not close | Temperature difference between DH supply and DHW set point too low. | Lower the set point temperature or increase the DH supply temperature. |
Disposal
This product should be dismantled and its components sorted, if possible, in various groups before recycling or disposal.
Always follow the local disposal regulations.
Declaration of conformity
Category 0 without electrical equipment
Danfoss A/S
DK-6430 Nordborg
Danmark
CVR nr.: 20 16 57 15
- Telefon: +45 7488 2222
- Fax: +45 7449 0949
EU-DECLARATION OF CONFORMITY
Danfoss A/S
Danfoss District Energy Division
declares under our sole responsibility that the products)
Small substations – type:
Termix One, Termix Novi, Termix BTD.
Covered by this declaration is in conformity with the following directives), standard(s) or other normative documents), provided that the product is used in accordance with our instructions.
Machinery Directive 2006/42/EC
DS/EN 60204-1/A1:2009. Safety of machinery – Part 1 –
General Requirements.
DS/EN 12100:2011, Safety of machinery – Risk
assessment.
Danfoss only vouches for the correctness of the English version of this declaration. In the event of the declaration being translated into any other language, the translator concerned shall be liable for the correctness of the translation
Gemina Termix A/S • Member of the Danfoss Group
- heating.danfoss.com
- +45 9714 1444
- E-Mail: mail@termix.dk
Danfoss can accept no responsibility for possible errors in catalogues, brochures and other printed material. Danfoss reserves the right to alter its products without notice. This also applies to products already on order provided that such alterations can be made without subsequential changes being necessary in specifications already agreed All trademarks in this material are property of the respective companies. Danfoss and all Danfoss logotypes are trademarks of Danfoss A/S. All rights reserved.
FAQ
- Q: What is the Termix AT BTD substation designed for?
A: The Termix AT BTD substation is designed for hot water preparation in single-family houses or apartments. - Q: How does the DHW circuit work?
A: The DHW circuit includes a hot water tank with coil and self-acting thermostatic control valve for efficient hot water production.
Documents / Resources
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Danfoss Termix AT BTD Thermostatic Valve [pdf] User Guide AQ190186478000en-010401, Termix AT BTD Thermostatic Valve, Termix AT BTD, Thermostatic Valve, Valve |
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Danfoss Termix AT BTD [pdf] User Guide AT BTD 5 pipes, AT BTD 4 pipes, Termix AT BTD, AT BTD |
