ra2000 series thermostatic radiator valves - danfoss heating

Hydronic Heating Division – North America

MAKING MODERN LIVING POSSIBLE

RA2000 SeriesThermostatic Radiator Valves

2-pipe Low Pressure Steam Systems


VA.GW.B1.22©Danfoss 01/2012



2-Pipe Steam• Concept

– 3 things inside the piping and radiation

• Air • Steam• Condensate

• Advantages– better control– faster heating– faster condensate recovery

• Disadvantages– more piping required– air and condensate removal– traps require maintenance



Temperature Control with Manual Valves, The Old Method

• 2-pipe steam, manual valve– line sized, only passing steam

The flow is controlled by adjusting the handle manually



Key Evidence on a 2-pipe Steam System

• Properly functioning

• Requires proper piping and pitch

Steam Trap

F & T Trap



Typical 2-Pipe Gravity Return System



2-Pipe Steam Systemw/ Condensate Pump

Steam Supply Main

Dry Return Main

Condensate Pump

Water Line

Open Vent Pipe



Other 2-pipe Low Pressure Steam Systems

• 2-pipe Sub-atmospheric Control System

– Also known as Variable Vacuum System or High Differential Vacuum System

– Controllable vacuum on both supply and return side of system

– Varying steam temperature

• 2-pipe Orifice System

– Each radiator has a sized orifice, at the trap or supply valve

– Controlling the differential pressure across the orifice to meet heating requirement

– Properly sized orifices provide even distribution of steam



“Human race did not leave the stone age because we ran out of stones. We simply found a

better way to do things.”

What if you could control each radiator…automatically?



Take Control

Thermostatic Radiator Assembly (TRV)Provided Benefits

– Non-electric

– Self contained

– Self regulating

– Zoning capabilities

– Simple use of operation

– Potential fuel savings of more than 20%



How does the TRV do it?

• The thermostatic operator throttles the amount of steam that enters the radiator

Nickel plated brass valve body

Snap on connection

Replaceable packing gland

Limiting and locking ability

Saturated vapor sensor, rapid response to room temperature

Internal back seating of valve

Brass union nut and tailpiece

Visible operator setting

Ergonomic design and shape for adjusting

2-pipe valve assembly



How does a TRV work on a 2-pipe steam?

Manual Only• Steam enters the radiator and forces

the air through the steam trap

• Air leaves the radiator and the steam fills the radiator

• The radiator is now filled with steam and radiates heat into the room possibly overheating the room

Installed TRV Assembly• Steam enters the radiator and forces the

air through the steam trap

• The operator senses the increase in the ambient air temperature and closes the valve, preventing additional steam into the radiator

• The radiator is filled with an amount of steam meeting the set temperature on the TRV reducing overheating and saving fuel



TRV’s Reaction

• The thermostatic operator reacts to the heat gains and heat losses within the room

• Free heat gains within a room can originate from:– Solar gain

– Appliances

– Occupants within the room

• Therefore …



Typical Installation ConfigurationsFree Standing Radiator

Built-in dial & sensor Dial w/ remote

sensorTamper proof dial w/ remote sensor

Tamper proof Built-in dial & sensor



Typical Installation ConfigurationsEnclosed Radiator

Remote wall mount dial and sensor

Cabinet mounted dial w/ remote operator & sensor



Typical Installation Configurations

Convector

Baseboard

Built-in dial & sensor

Dial w/ remote sensor





Typical Installation Configurations

Fan Coil





Typical Valve Patterns

Straight

AngleSide Mount Angle



Dial up comfort. Dial down heating costs.Achieve energy savings by installing the Danfoss thermostatic radiator valve.

ra2000 series thermostatic radiator valves - danfoss heating

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