Data Sheet
FHM-C5, FHM-C6
Mixing Shunts for Floor Heating
Application
Ordering
Accessories
Mixing shunt FHM-C5 and FHM-C6
The Danfoss compact mixing shunts are used for regulation of flow and supply temperature in hydronic floor heating systems.
The compact, flexible design allows mounting the mixing shunt directly to the manifold on both left and right side, with the primary pipe connection from the side or below.
A self-acting proportional regulator is used to regulate the supply temperature. The regulator ensures that the desired supply temperature to the underfloor heating system always remains constant.
A built-in check valve ensures correct flow direction.
An air-vent on top and a thermometer completes the mixing shunt. An optional thermostat protects the floor against too high temperatures.
FHM-C5 and FHM-C6 have a standard 3-speed pump (UPS).
FHM-C5 and FHM-C6 compact mixing shunts can be mounted directly to the Danfoss manifold system without the use of special equipment.
By using Danfoss floor heating controls all expectations of a professional floor heating system are fullfilled.
Should water treatment be used it is essential that dosing instructions of the manufacturer are strictly observed. It is recommended that formulations containing mineral oil are avoided.
Product |
Max. effect at |
Max. effect at |
Pump type, |
Code no. |
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sec. Δt = 5K |
sec. Δt = 10K 1) |
Grundfos |
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FHM-C5 |
4,5 kW |
9 kW |
UPS 15-40 |
088U0093 |
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FHM-C6 |
7 kW |
13 kW |
UPS 15-60 |
088U0096 |
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1) Max. effect at Δt = 30K in primary (70/40) and Δt = 5K (10K) in secondary line with heatloss 50 W/m².
Product |
Type |
Code no. |
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Thermometer 0 °C to 60 °C, Ø 35 mm |
FHD-T |
088U0029 |
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Safety thermostat |
FH-ST55 |
088U0301 |
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Temperature controller, 15 °C to 50 °C |
FTC |
013G5081 |
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Measuring set for needles |
FHM-MS |
088U0304 |
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Angle fittings (set of 2 pcs.) |
FHM-AF |
088U0305 |
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© Danfoss | FEC | 2020.06 |
AI304357196452en-000101 | 1 |
Data Sheet |
FHM-C5, FHM-C6 Mixing Shunts for Floor Heating |
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Technical specifications |
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Supply voltage |
230 V AC |
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Primary connection |
½” |
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Max. differential pressure with Danfoss Floor |
0,6 bar |
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Heating manifolds |
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Max. working pressure |
PN10 |
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Max. flow temperature |
90 °C |
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FTC flow temperature control |
18 °C to 50 °C |
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FH-DT supply flow thermometer |
0 °C to 60 °C |
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Integrated check valve |
POM / Stainless steel |
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Body, unions and other metal parts |
Brass / Stainless steel |
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O-rings and seals |
EPDM |
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Weight |
approx. 3,5 kg to 4 kg (depending on model) |
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FH-ST55
Safety thermostat
230V / 16A TS 55°C
Electrical connection
The FH-ST safety thermostat is fixed on the tube and protects floor and system against too high temperatures, especially important for wooden floors. The FH-ST thermostat switches off the power supply of the floor heating base unit, when the temperature reaches 55 °C.
By switching off the power supply of the floor heating base unit, the actuators (NC) will close automatically and the floor heating system is protected.
The FH-ST55 can also be connected to a pump or a zone valve.
Note! The electrical installation must be carried out by an authorized installer only (230 V DC).
Code no. |
088U0301 |
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Shut-off temperature |
55 °C |
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Switch difference |
4 K |
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Classification |
IP 40 (mounted) |
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2 | © Danfoss | FEC | 2020.06 |
AI304357196452en-000101 |
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