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.

(013G8250) (013G8240)

Use standard or

tamper resistant model

with combined dial/operator/sensor.

Always install the operator horizontally.

(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.

Danfoss

Baltimore, MD

Toll Free: 866-375-HVAC (4822)

Fax: 416-352-5981

www.heating.danfoss.us

Danfoss

Toronto, ON

Toll Free: 866-375-HVAC (4822)

Fax: 416-352-5981

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).

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