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MTA

SINGLE

The MTA Single heat pump optimised heat interface unit is designed for use within Heat Networks where heat pumps or a traditional gas fired boiler plant provides the source of energy. There are two models available, the MTA Eco Single and the MTA Plus Single.

35kW

  • SWEP AS 316 heat exchanger (MTA Eco)

  • SWEP LAS AISI 316 heat exchanger (MTA Plus)

  • Ultra-compact dimensions

  • Fully electronic unit

  • Keep warm function (On/Off/Timed)

  • DHW priority

  • 3 bar rated

  • Unique HydraBlok® back plate

  • Primary flow rate limitation

  • Advanced diagnostics

  • Advanced pump control (anti-seizure)

  • Remote connectivity

  • Automatic low heating circuit pressure cut out

  • Provision for fitting of underfloor safety thermostat

  • First fix kit supplied as standard

  • Compatible with smart home controls

  • Return temperature limitation through control of heating ΔT

  • Weather compensation functionality (sensor required)

  • Servicing and parts replacement from front

  • Integrated apartment quick-fill device

  • Isolation & drain valves fitted as standard

  • Labelled water connections

  • Underfloor or radiator temperature set-points

  • PWM controlled A-rated modulating heating pump

  • Closed-cell foam insulation cover

  • Optional flushing bypass valve available

  • Optional top entry pipe kits available

*Subject to Terms & Conditions

Downloads

Brochure

Installation Guides

BIM Drawings

Download
User Guide
MTA Installation Guide
Flushing Bypass Installation Guide
Download
Features in detail
Unique HydraBlok® back plate

Most other heat interface units available on the market are often a myriad of metal pipework and brass fittings. With this type of HIU every union is a potential source of a water leak, as the unions often loosen during transportation from the factory to the point of use. The MTA has little potential for leaks as it is not fitted with metal pipework and brass fittings. Everything is built upon a unique HydraBlok® backplate which contains all waterway channels moulded within a composite chassis.

Return temperature limitation

To ensure the heat network operates at maximum efficiency, the MTA will modulate the rate of water flow provided by the internal apartment heating circuit pump to match the heat load of the apartment at any one time. This maintains the designed heating circuit ΔT and limits the temperature of the water returning to the primary circuit.

Primary flow rate limitation

The MTA can limit the primary flow rate in both DHW and heating mode, independently of each other.  Limiting the maximum flow rate that the HIU can take from the primary system, during space heating production, guarantees the design flow rate used to calculate system demand, is not exceeded.

Advanced pump control

The MTA features 24 hour pump exercising - if the heating circuit has not been used for 24 hours, the MTA will run the pump (and open the heating regulation valve) for 10 seconds, ensuring debris cannot build up in the pump bearings. The MTA also features a low pressure cut out. If the heating circuit pressure falls below 0.4bar, the pump will stop running. The unit will continue to produce DHW.

Advanced diagnostics

The control panel within the MTA provides a friendly, intuitive user experience. In addition, it provides an extremely high level of real time data, offering an overview of the current conditions within the network, HIU and apartment.

1
Primary flow temperature
2
DHW temperature
3
MCW temperature
4
Primary return temperature
5
District modulating valve stepper motor position (0 to 250)
6
DHW flow rate
7
DHW regulation valve stepper motor position (0 or 250)
8
Heating regulation valve stepper motor position (0 or 250)
9
Heating flow temperature
10
Heating pressure
11
Heating flow rate
12
Heating return temperature
13
Primary flow rate
1
Primary flow temperature
2
DHW temperature
3
MCW temperature
4
Primary return temperature
5
District modulating valve stepper motor position (0 to 250)
6
DHW flow rate
7
DHW regulation valve stepper motor position (0 or 250)
8
Heating regulation valve stepper motor position (0 or 250)
9
Heating flow temperature
10
Heating pressure
11
Heating flow rate
12
Heating return temperature
13
Primary flow rate
ModuHub (optional extra)

ModuHub enables remote monitoring and control of the MTA heat interface unit, enabling network operators to continuously optimise their heat networks, ensuring reduced running costs whilst improving service quality for the end users.
It can also be used to detect and alert maintenance providers to possible faults, allowing faults to be resolved remotely and considerably reducing the number of planned service/maintenance visits to site.
ModuHub creates an open protocol wireless billing network, removing the requirement for an Mbus network. Through our open API, meter reads can be retrieved by billing providers using LoRa Communication. Moduhub can be utilised for both prepayment or credit billing.
The ModuHub box is small and compact, allowing it to fit within the MTA casing.

Specification
35kW
Primary Circuit (district)
Max operating pressurebar3
Maximum supply temperature°C85
Min/max differential pressurebar0.5/4
Domestic Hot Water (apartment)
Maximum heat exchanger capacity (Eco/Plus)kW90 / 107
Hot water set-point°C40-60
Maximum cold feed supply pressure bar10
Heating (apartment)
Maximum heat exchanger capacitykW19
Heating water set-point (underfloor)°C30-45
Heating water set-point (radiators) °C45-80
Maximum operating pressure bar2.9
Safety valve settingbar3
Circulating pumpWilo Para 8-75
Expansion vessel volumelitres10
Heating control (room thermostat) Volt free
General
Dimensions (HxWxD)mm600 x 500 x 312
Water connectionsmm18/22
Weight (HIU)kg21
Weight (first fix kit)kg4
Electrical
Mains supply230-1-50
Power consumptionW85
ProtectionIP44
Connections
District inletBSPG 3⁄4"
District returnBSPG 3⁄4"
Heating flowBSPG 3⁄4"
Heating returnBSPG 3⁄4"
Domestic hot water outletBSPG 3⁄4"
Mains cold water inletBSPG 3⁄4"
Domestic cold water outletBSPG 3⁄4"
Pressure relief valve drainBSPG ½"
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