Danfoss Compact 28 VVX-FI Operating guide

Operating Guide

Termix Compact 28 VVX-FI

1.0 Table of Contents

1.0	Table of Contents .............................................	1
2.0	Functional description......................................	2
3.0	Safety notes.....................................................	3
3.1	Safety Notes – general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	3
4.0	Mounting ........................................................	4
4.1	Mounting the Compactstation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	4
4.2	Start-up. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	13
4.3	Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	15
5.0	Design.............................................................	16
5.1	Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	16
5.2	Schematic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	17
6.0	Controls ..........................................................	18
6.1	Heating circuit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	18
6.2	DHW temperature control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	22
6.3	Other. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	24
6.4	Maintenance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	26

7.0 Troubleshooting ..............................................

7.1 Troubleshooting in general . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27 7.2 Troubleshooting DHW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28 7.3 Troubleshooting HE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 7.4 Disposal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

8.0 Declaration......................................................

8.1 Declaration of conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

VI.LZ.K2.02 / LUK42463 | 1

Operating Guide Termix Compact 28 VVX-FI

2.0 Functional description

District heating substation for indirect heating and instantaneous domestic hot water.

Space heating and domestic hot water (DHW)

The Termix Compact 28 VVX-FI is a complete unit for indirect space heating and domestic hot water for district heating in large buildings such as sports centres, schools, blocks of flats etc.

It can be used for connection to indirect district heating in places where the district heating plant requires a hydraulic break. It is also suitable for conversion to district heating when the secondary heating system is unsuitable to being connected to direct district heating or when a particularly effective security against leakage in the heating system is required.

Efficient heat exchanger

The substation is fitted with an efficient plate heat exchanger, which ensures the most favourable heat extraction and achieves optimum comfort and operating economy.

Electronic regulation

The Termix Compact 28 VVX-FI is built with a plate heat exchanger for instantaneous domestic hot water production and heat exchanger for space heating. Each circuit is also supplied with its own flow controller.

This allows the greatest degree of individual control, thus preventing oscillation at different loads. The electronic controller is factory pre-set. Electrical components are pre-wired, and the unit is equipped with a plug for 230 V a.c.

It is recommended that balancing valves are installed in the building’s risers in the heat supply and on the heating system’s return line immediately before the unit.

Minimal heat loss

Complete insulation of the unit ensures minimal heat loss.

Easy installation

The unit consists of two modules, one for space heating and one for domestic hot water production, which is easily assembled into one single module. This modular design makes work during installation significantly easier, as the weight is split between two modules during handling.

Flexible solution

Pipe connection can be made from either the top or bottom, which makes this solution highly flexible. At the same time, both space and time are saved when installing.

Reliable and easy to install

Termix Compact 28 VVX-FI is operationally reliable. A quality product manufactured in Denmark which is easy to install and quickly commissioned.

2 | © Danfoss | 2019.01

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

3.0 Safety notes

3.1 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 110 °C.

The maximum operating pressure of the substation is 16 bar.

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.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

4.0Mounting

4.1Mounting the Compactstation

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.

Connections:

1.District heating (DH) supply

2.District heating (DH) return

3.Heating (HE) supply

4.Heating (HE) return

5.Domestic hot water (DHW)

6.Domestic cold water (DCW)

7.Hot water circulation (HWC)

Authorized personnel only

Assembly, start-up and maintenance work must be performed by qualified and authorized personnel only.

Connection sizes:
DH + HE:	G 1” (int. thread)
DCW + DHW:	G 1” (int. thread)
HWC:	G ¾” (int. thread)
Dimensions (mm):
With insulation:	H 890 x W 1460x D 400

The pipe placement can deviate from the shown drawing. Please note the markings on the station.

Weight (approx.): 95 kg

4 | © Danfoss | 2019.01

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

Remove the front.

Remove the other blocks and the white polystyrene.

Attach the mounting rail to the wall.

Lift the station’s heating section.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

Mount the station as far to the left on the rail as possible.

Lift the station’s instantaneous domestic hot water part.

Mount the instantaneous domestic hot water part on the right-hand side of the fittings.

Push the two parts together. The two mounting plates must click together in the overlap.

VI.LZ.K2.02 / LUK42463

Danfoss Compact 28 VVX-FI Operating guide

Operating Guide Termix Compact 28 VVX-FI

Attach the station to the wall in the holes on the mounting plate.

Assemble the power connector on the hot water part of the station. For proper functionality, connectors must be paired by colour.

Install the safety valve.

Install the ball valves.

Mount block A (C if it is the Magna pump) on the left-hand side of the pump. Attach block E to block A/C, and attach it to the pipe above the pump by clicking it in place.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

Mount block B (D if it is the Magna pump) on the right-hand side of the pump.

Mount block F (G for VM2 valve). The block is hinged and can be drawn around the valve. Attach the block to block B/D and E.

Mount block L. The block is hinged and can be pulled around the UPM3 pump.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

Mount block M. The block is hinged and can be drawn around the valve. Attach the block to block L.

Mount the small front cover.

Mount the large front cover.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

	4.1.1 Installing the Compactstation
	Mounting:
	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	Keyhole for mounting.
	Each connection on the substation is labelled.	Keyhole for mounting.
	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.

VI.LZ.K2.02 / LUK42463

Operating Guide Termix Compact 28 VVX-FI

4.1.2 Pipe connections up

Remove the top block.

Remove the pipe plugs at the top of the station.

Remove U-clamps.

Remove pipes.

Angles and tees are turned so that pipes can be installed from above.

VI.LZ.K2.02 / LUK42463

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