Space saving design

Prefabricated unit

Easy to install

TTM Shuntopac® 125-200 VÅ

Shunt unit for heat recovery

TTM Shuntopac® 125-200 VÅ is a shunt unit for heat recycling systems and is available as standard with connection dimensions from DN 125 up to DN 200. The shunt unit can be equipped with components of any make and with several different connection options.

TTM Shuntopac® 125-200 VÅ is supplied with a fire and corrosion proof housing of aluzinc sheet. Standard insulation is AF/Armaflex AF-4. The shunt unit has a stand with four legs and foot plates for floor set-up and attachment. The standard version pipe package consists of fully-welded pressure vessel pipe SS-EN 10216-2, rustproofed with grey primer. Pipe packages in other qualities or with another surface treatment can be supplied to order.

TTM Shuntopac® 125-200 VÅ is CE-marked in accordance with the manufacturer’s declaration 2B according to the Machinery Directive.

The shunt unit is environmentally approved.


1. Control valve
Seat valve with flange or threaded connection in a choice of make and type.

2. Shut-off valves
3 pcs butterfly valves. Designed to act as end valves if the shunt unit is removed from the system. Installed on pipe package with flange joint.

3. Pump
Choice of make and type with “wet” or “dry” motor.

4. Adjustment valve
1 pc in a choice of make and dimension for adjustment of total flow. Installed on pipe package with conical coupling. Make: TA STAD/F supplied as standard. Can also be supplied with dynamic adjustment valve, flow regulator or differential pressure regulator.

5. Thermometers
3 pcs, graduated -40 – +40 °C. Installed in sensor tubes.

6. Adjustment valve
1 pc butterfly valve for adjustment of bypass flow.

7. Drain plug
Version with hose screw connection R 1/2”.

8. Test socket
Type TA STAD, installed on all connections.

Special design
  • Pipe mixing loop made of e.g., copper or stainless steel of the desired quality.
  • Anti-corrosive painted pipe mixing loop, e.g. epoxy enamelled.

TTM Shuntopac® 125-200 VÅ differential pressure measurement

All outside valves on the TTM Shuntopac® 125-200 VÅ are provided with test sockets, allowing complete differential pressure measurement.

A – B Pressure drop in supply air circuit.
C – A Head over circulation pump.
D – C Pressure drop in exhaust air circuit.
E – D Differential pressure measurement over adjustment valve in exhaust air circuit.
B – F Pressure drop over control valve.

Dimensions TTM Shuntopac®  125-200 VÅ

Connection DN 125 150 200
A 1500 1900 2300
B 1250 1400 1700
C 380 500 600/650 (centre)
D 180 200 225
E variabel variabel variabel
F 400 400 460
G 1450 1600 1900
H 275 275 275
I 370 450 525
J 760 1000 1250
Weight, approx. kg 400 550 750

Max. pressure: 1,0 MPa
Temp. range: -20 – +110 °C
Specified dimensions are valid for the standard version. Some variations may occur if alternative equipment is used.

TTM Shuntopac® 125-200 VÅ

Constant flow in exhaust air heat exchanger circuit.

Variable flow in supply air heat exchanger circuit.

The control valve is installed as a mixing valve.

01 VÅ

02 VÅ

System example


Total flow
1. Connect differential pressure instrument to adjustment valve with measuring point.
2. Set the control valve to fully open position (stem depressed, bypass closed).
3. Measure the water until it reaches the calculated value.

Bypass flow
4. Set the control valve to fully closed position (stem up, bypass open).
5. Adjust the inner adjustment valve until the outer adjustment valve achieves the same pressure drop as before.


TTM SHUNTOPAC® Green Line is a category of shunt units equipped with low-lead valves. Green Line is intended for customers with high demands for improved environmental assessments


TTM SHUNTOPAC® Dynamic gives correct regulation even in systems with varying differential pressures or where the differential pressure is unknown.


TTM SHUNTOPAC® EM is a category of shunt units equipped with ultrasound energy metering equipment according to EN 1434 class 2 and MID 2004/22/EC.


Simonsland in Borås

When Kanico created a new district in the town of Borås, they chose TTM to supply shunt units for the HVAC systems. The area is called Simonsland and contains 60,000 m2 of buildings.


TTM Energiprodukter was one of the suppliers in the construction of the prestigious Copenhagen Opera House Together with their reseller, the company succeeded in winning the deal and delivering 98 different shunt units.


NCC are building their new head office at Järva Krog in Solna. The new head office has a strategic and easily accessible position adjacent to the E4 motorway.