Danfoss RA2000 User manual

Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
VISXA222 © Danfoss 04/16
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 “non-vacuum” 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 a zone where the boiler is cycled by
an existing space thermostat. 1PS thermostatic radiator valve
assembly is not recommended for copper n 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
RA 2000 1PS Thermostatic
Radiator Valve
(Complete Assembly)
Thermostatic
Operator
(013G8250 shown)
Air Vent
(013L8011)
1PS Valve
(013G0140)
1/8” 45°
Street Elbows
(Optional)
(013L8300)
Spare Parts:
Packing Gland
(013G0290)
Vacuum Breaker
(013U7175)
Free Standing Radiators/Built-In Sensor: Use built-in
sensor when room air can pass freely over the sensor.
Free Standing Radiators/Remote Sensor: Use remote
sensor when room air cannot pass freely over the sensor.
a)
(013G8250) (013G8240)
Use standard or
tamper resistant model
with combined dial/operator/sensor.
Always install the operator horizontally.
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.
Convectors: The one-pipe low-pressure steam convector is
inaccessible; room air cannot continually pass freely over the
valve.
Enclosed Radiators: The cabinet enclosed radiator
conguration requires that the dial and sensor be mounted
separately, away from 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.
(013G8564)
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 on the enclosure or wall.
(013G8562)
Use dial / operator with remote sensor.
The sensor and capillary tube may be
extended up to 6’ and can be easily
wall mounted.
the system off-cycle via a patented “‘across the seat” vacuum breaker. This
eliminates condensate build-up and allows natural system aspiration to occur.
Thermostatic Operator Selection:
Tamper
Resistant
Standard

Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
VISXA222 © Danfoss 04/16
Prior to Installation:
The operator with valve-mounted dial and sensor must be
mounted horizontally.
IMPORTANT
In one-pipe steam systems sufcient 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 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
satised, 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.

Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
VISXA222 © Danfoss 04/16
Installation:
1. With the heat source off, carefully remove
existing air vent from the radiator.
2. Carefully thread the valve body 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
Wall Mounted Operator

Danfoss can accept no responsibility for possible errors in printed materials and reserves the right to alter its products without notice.
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Danfoss
Baltimore, MD
Toll Free: 866-375-HVAC (4822)
Fax: [phone]
www.heating.danfoss.us
Danfoss
Toronto, ON
Toll Free: 866-375-HVAC (4822)
Fax: [phone]
www.heating.danfoss.us
VISXA222 © Danfoss 04/16
Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
Symptoms Cause / Issue
“Spitting” air vent
• 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
• 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
Under heating within room
• 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
Troubleshooting:
Setting:
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 specic operator for details on this procedure).