Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
RA2000 SeriesThermostatic Radiator Valves
2-pipe Low Pressure Steam Systems
MAKING MODERN LIVING POSSIBLE
VA.GW.B1.22©Danfoss 01/2012
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Key Evidence on a 2-pipe Steam System
• Properly functioning
• Requires proper piping and pitch
Steam Trap
F & T Trap
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical 2-Pipe Gravity Return System
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
2-Pipe Steam Systemw/ Condensate Pump
Steam Supply Main
Dry Return Main
Condensate Pump
Water Line
Open Vent Pipe
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
“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?
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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%
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
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 …
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical Installation ConfigurationsFree Standing Radiator
Built-in dial & sensor Dial w/ remote
sensorTamper proof dial w/ remote sensor
Tamper proof Built-in dial & sensor
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical Installation ConfigurationsEnclosed Radiator
Remote wall mount dial and sensor
Cabinet mounted dial w/ remote operator & sensor
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical Installation Configurations
Convector
Baseboard
Built-in dial & sensor
Dial w/ remote sensor
Remote wall mount dial and sensor
Cabinet mounted dial w/ remote operator & sensor
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical Installation Configurations
Fan Coil
Remote wall mount dial and sensor
Cabinet mounted dial w/ remote operator & sensor
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Typical Valve Patterns
Straight
AngleSide Mount Angle
Hydronic Heating Division – North America
MAKING MODERN LIVING POSSIBLE
Dial up comfort. Dial down heating costs.Achieve energy savings by installing the Danfoss thermostatic radiator valve.
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