Data sheet RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Typical
Installation:
Dial / Operator / Sensor + Valve
FREE STANDING RADIATORS
The free-standing one-pipe low-pressure steam radiator is positioned where air continually passes
freely over the operator
Use standard or tamper resistant
model with combined dial/
operator/sensor. Always install
the operator horizontally
FREE STANDING RADIATORS
The free-standing one-pipe low-pressure steam radiator is accessible, but due to obstruction air
cannot continually pass freely over the operator
Use dial / operator with remote
sensor. The sensor and capillary
tube may be extended up to 6’
and can be easily wall mounted.
Use air vent
PLUS
1/8” one-pipe
steam valve
Use air vent
PLUS
1/8” one-pipe
steam valve
CONVECTORS
The one-pipe low-pressure steam convector is inaccessible; room air cannot continually pass freely
over the sensing element
Use operator with combined
remote dial / sensor. The dial/
sensor and capillary tube may be
extended up to 6’ and are wall
mounted.
Use air vent
PLUS
Two 45° elbows
PLUS
1/8” one-pipe
steam valve
ENCLOSED RADIATORS
The cabinet enclosed radiator conguration requires that the dial and sensor be mounted separately,
away from the valve
Use operator with separate
remote dial and remote sensor.
Place the remote sensor on a
draft-free wall. The remote dial
mounts on the enclosure or wall.
Use air vent
PLUS
1/8” one-pipe
steam valve
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Data sheet
3-5/32”
31-32”
RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Design & Function:
• Danfoss’ RA 2000 1PS one-pipe steam
thermostatic radiator valve provides
accurate temperature control and quite
operation.
• The movement of air across the
thermostatic operator eects the
modulation control in regulating the
venting of air from the radiator or
convector.
• Based on the set temperature on the
operator, the 1PS regulates the amount
of steam allowed into the emitter by
controlling the amount of air allowed to
vent out.
• The venting action occurs during each
system (boiler) on-cycle only when heat
Part Material
1. Valve
2. Valve disc
3. Spindle guide
4. Spring
5. Back seat washer
6. Valve Spindle
7. Pressure pin
8. Clamping band
9. Allenscrew
10. Socket
11. Bellows
12. Handle
13. Adjustment spring
14. Safety spring
15. Pressure spindle
16. Air vent
17. Retainer
18. Packing gland
19. Capillary Tube
Nicel plated brass
EPDM
Phosphor bronze
Stainless Steel
EPDM
Brass
Stainless steel
Al. alloy
Steel
Zytel Nylon
Phosphor bronze
ABS
Steel
Steel
Polymide No. 6
Brass
Steel
is required. Air will re-enter the system
during the boiler o-cycle via a patened
“across the seat” vacuum breaker. This
eliminates condensate buildup and allows
natural system aspiration to take place.
• The RA 2000 1PS assembly is specically
designed for low pressure steam systems.
The system pressure should not be
constant preventing air to get back into
the system.
• Thermostatic radiator valve assembly-
valve, thermostatic operator and air ventcan be used for free standing radiators,
convectors, and enclosed radiators. 1PS
is not recommended for copper n tube
radiators.
Dimensions:
1-1/32
”
2-7/3 2”
3-1/8 ”
3-5/32”
3-1/8 ”
2
2-11/64”
2-1/4”
3-7/16”
VDSXA222 © Danfoss 06/16
1-3/8”
1-27/64”
2-13/16”
3-1/8 ”
3-5/32”
3-5/32”
3-1/8 ”
3-7/16”
2-11/64”
2-7/32”
1-1/16”
2-1/4”
2-7/32”
3-3/16”
1/8” NPT
5-3/16”
1-1/4”
27/32 ”
1-1/4”
11/3 2”
13/32”
1/8” NPT
1-21/32”
29/32”
Data sheet RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Technical Data:
RA 2000 Operators:
Typ e Maximum Temperature Maximum Pressure
RA 2000 1PS 250°F (121°C) 15psig
Operator Code No. Description Sensor Capillary
013G 825 0 Valve mounted dial & sensor Built-in -
013G 8252 Valve mounted dial with remote sensor Remote 6’
013G 824 0
013G2922
013G 8562 Combined remote mounted dial & sensor - 6’
013G 8565 Combined remote mounted dial & sensor - 16’
013G 8568 Combined remote mounted dial & sensor - 26’
013G 8564
Valve mounted dial and sensor, tamper
resistant
Valve mounted dial with remote sensor
tamper resistant
Separate remote mounted dial and
sensor
Built-in -
Remote 6’
Remote 6’ + 6’
Parts and Accessories
For RA 2000 Operators:
013G 825 0
013G 8252
013G 824 0
013G2922
013G 8562
013G 8565
013G 8568
013G2564
RA 2000 1PS Valve :
Code No. Description
013G12 36 Screwdriver tool set for RA 8240 / 2922
013G1215 Limitation pins for RA 8250/52 (30 pcs)
013G12 37 Limitation pins for tamper resistant operators RA 8240 / 2922 (30 pcs)
013G52 45 Anti-theft protection clips for RA 8250/52 (20 pcs)
013G12 32 Locking screw plugs for tamper resistant operators RA 8240 / 2922 (50 pcs).
013G1672 Cover plate for setting Window of tamper resistant operators (20 pcs)
1
2
Design Code No. Valve size Pattern
Code No. Description Position No.
013G5191 Socket Body for RA 2000 1
013G5503 Bellows Holder (set of 2 pcs) 2
Connection
Inlet x Outlet
013G 0140 1/8” 1PS MPT x FTP
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Data sheet
RA 2000 1PS
Thermostatic Radiator Valve
For Use on One-Pipe Low-Pressure
Steam Systems
Parts and Accessories
For RA 2000 1PS Valve :
How to avoid problems:
Code No. Description
013L8011 1-Pipe steam air vent
013L 8300 Brass 45° street elbow for convector, for space consideration
013G 0290 Packing gland for valves
The operator with valve-mounted dial and sensor must be
mounted horizontally.
IMPORTANT
In one-pipe steam systems sucient pitch is required to
permit condensate return. Condensate should not be
trapped in the valve or vent. The vent (when not supplied)
should be checked to assure it is properly working.
Boiler/steam supply must not run at constant pressure. This
prevents the ability for air to enter 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 satised, boiler steam pressure must be kept
low, recommended normally at or below 2psig. Otherwise
air will be compressed in the radiator, allowing steam to
enter when not required.
Setting:
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.
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The user can easily set room temperature by
turning the dial clockwise or counterclockwise.
The diagram to the right shows the appropriate
relationship between dial scale numbers and
room temperature.
At its lowest setting, the RA 2000 1PS
provides frost protection and maintains room
Danfoss
Toronto, ON
Tel.: 866-372-4822, Fax: 416-352-5981
www.heating.danfoss.us
VDSXA222 © Danfoss 06/16
temperature at approximately 45°F (7°C).
At its highest setting, the RA 2000 1PS
maintains room temperature at approximately
85°F (30°C).
The temperature on all RA 2000 1PS models
may be limited or locked.
Danfoss
Baltimore, MD
Tel.: 866-372-4822, Fax: 416-352-5981
www.heating.danfoss.us
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