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 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
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
configuration 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
