Install Instructions

Installation
Instructions
RA2000 One Pipe Steam (1PS)
Thermostatic Radiator Valve
VISXA122 © Danfoss 10/07
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.
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)
Free Standing Radiators:
The free-standing one-pipe low-pressure steam radiator is positioned where air continually passes freely over the operator
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.
(013G8562)
Use dial / operator with remote sensor.
The sensor and capillary tube may be
extended up to 6’ and can be easily
wall mounted.
(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.
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 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: