Page 1
Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
Description:
RA 2000 one pipe steam (1PS) thermostatic radiator valve is a three
part assembly consisting of a valve body (013G0140), air vent
(013L8011) and thermostatic operator (air vent and thermostatic
operators are sold separately). See Thermostatic Operator Selection
instructions below to determine correct operator for your application.
The 1PS thermostatic radiator valve assembly is designed to provide
accurate temperature control and quiet operation on all “nonvacuum” low pressure (max. 15 psig) one pipe steam heating systems.
Note: For proper valve operation, the steam supply must be cycled
by a boiler control. Do not install the 1PS thermostatic radiator valve
assembly in the same room where the boiler is cycled by an existing
space thermostat. 1PS thermostatic radiator valve assembly is not
recommended for copper fin tube radiators.
Function:
A temperature change around the thermostatic operator’s sensor
results in a modulating action of air venting from the radiator or
convector.
When the thermostatic operator calls for heat, steam enters the
radiator and pushes air out through the vent. When the setting
temperature is reached, the 1PS valve will be closed and no further
air venting takes place.
The venting action occurs during each system (boiler) on-cycle
only when heat is required. Air will re-enter the radiator during the
Thermostatic
Operator
(013G8250 shown)
RA 2000 1PS Thermostatic
Radiator Valve
(Complete Assembly)
Spare Parts:
system off-cycle via a patented “‘across the seat” vacuum breaker. This eliminates
condensate build-up and allows natural system aspiration to occur.
1PS Valve
(013G0140)
Packing Gland
(013G0290)
Air Vent
(013L8011)
1/8” 45°
Street Elbows
(Optional)
(013L8300)
Vacuum Breaker
(013U7175)
Thermostatic Operator Selection:
Free Standing Radiators/Built-In Sensor: Use built-in sensor
when room air can pass freely over the sensor.
a)
Tamper
Standard
(013G8250) (013G8240)
Use standard or
tamper resistant model
with combined dial/operator/sensor.
Always install the operator horizontally.
Convectors: The one-pipe low-pressure steam convector is
inaccessible; room air cannot continually pass freely over the valve.
Available for mounting the 1PS assembly
onto convectors are 1/8” 45° street
elbows, part number 013L8300. When
ordering these elbows two pieces are
needed per convector.
(Remote sensors are not to be placed under cast iron elements of any type)
Use operator with separate remote dial
and remote sensor. Place the remote
sensor beneath the element or on a
draft-free wall. The remote dial mounts
(013G8564)
on the enclosure or wall.
Resistant
Free Standing Radiators/Remote Sensor: Use remote sensor
when room air cannot pass freely over the sensor.
b)
(013G8252)
Use dial / operator with remote sensor.
The sensor and capillary tube may be
extended up to 6’ and can be easily wall
mounted.
Enclosed Radiators: The cabinet enclosed radiator configuration
requires that the dial and sensor be mounted separately, away from
the valve.
(013G8562)
Use dial / operator with remote sensor.
The sensor and capillary tube may be
extended up to 6’ and can be easily wall
mounted.
VISXA322 © Danfoss 11/16
Page 2
Installation
Instructions
Prior to Installation:
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
The operator with valve-mounted dial and sensor must be mounted
horizontally.
IMPORTANT
In one-pipe steam systems sufficient pitch is required to permit
condensate return. Condensate should not be trapped in the valve or
vent.
Boiler/Steam supply must be cycled by a reset control or room
thermostat and must not run at constant pressure (which would
prevent air from entering back into the system).
Make sure that free-standing radiators or cast iron convectors are
properly pitched and that hand valves are FULLY open.
To aid in preventing overheating of rooms that are temperature
satisfied, boiler steam pressure must be kept low, recommended
normally at or below 2 psig. Otherwise air will be compressed in the
radiator, allowing steam to enter when not required.
VISXA322 © Danfoss 11/16
Page 3
Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
Installation:
1. With the heat source off, carefully remove
existing air vent from the radiator.
2. Carefully thread the valve body (013G0140)
into the radiator. Tighten the valve such that the
orientation of the air vent port is up.
The piping of an extension between the radiator
and valve body should not be done.
3. Tighten the air vent (013L8011) to the valve
body.
If using an air vent not supplied by Danfoss, it
must be a straight shank vent.
4. Mount the thermostatic operator to the valve.
Refer to the installation instructions included
with the thermostatic operator for proper
mounting to the valve.
Valve Mounted Operator
VISXA322 © Danfoss 11/16
Wall Mounted Operator
Page 4
Installation
Instructions
Setting:
Troubleshooting:
Symptoms Cause / Issue
“Spitting” air vent
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
The user can easily set room temperature by turning the dial clockwise or
counterclockwise. The diagram to the left shows the approximate relationship between
dial scale numbers and room temperature.
At its lowest setting, the RA 2000-1PS provides frost protection and maintains room
temperature at approximately 45°F.
At its highest setting, the RA 2000-1PS maintains room temperature at approximately
85°F.
The temperature on all RA 2000-1PS models may be limited or locked (see instructions
included with specific operator for details on this procedure).
• Check the pitch of the radiator
• Fully open the supply valve
• Check riser air vent for main system
• Verify if excessive pressure is within system
Overheating within room
Under heating within room
Danfoss
Toronto, ON
Toll Free: 888-DANFOSS (326.3677)
www.heating.danfoss.us
• Ensure thermostatic operator is in an appropriate location
• Move remote sensor or dial/sensor to a different location
• The vacuum breaker mechanism may be clogged with debris
• Verify if excessive pressure is within system
• Ensure thermostatic operator is in an appropriate location
• Move remote sensor or dial/sensor to a different location
• The air vent may be stuck closed
• Check riser air vent for main system
• Check the pitch of the radiator
• Verify if excessive pressure is within system
Danfoss
Baltimore, MD
Toll Free: 888-DANFOSS (326.3677)
www.heating.danfoss.us
Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.
All trademarks in this material are property of the respective companies. Danfoss and Danfoss logotype are trademarks of Danfoss A/S. All rights reserved.
VISXA322 © Danfoss 11/16
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