Code No. LIT-1900299
Issued August 12, 2005
®
RJ-120 and RJ-120-S
On/Off Electric Spring Return Actuators
Description
•
The RJ-120 and RJ-120-S direct-mount,
spring return electric actuators operate on
AC 120 V power. These bidirectional actuators
do not require a damper linkage, and are
easily installed on a damper with a round shaft
up to 1/2 in. (13 mm) in diameter or a square
shaft up to 3/8 in. (10 mm).
The RJ-120 and RJ-120-S On/Off Electric
Spring Return Actuators provide a running and
spring return torque of 53 lb·in (6 N·m). The
rotation range is mechanically adjustable. An
integral line voltage auxiliary switch is
available on the RJ-120-S model to indicate
end-stop position, or to perform switching
functions within the selected rotation range.
IMPORTANT: Use this RJ-120 or RJ-120-S
On/Off Electric Spring Return Actuator only
to control equipment under normal operating
conditions. Where failure or malfunction of
the electric actuator could lead to personal
injury or property damage to the controlled
equipment or other property, additional
precautions must be designed into the
control system. Incorporate and maintain
other devices such as supervisory or alarm
systems or safety or limit controls intended
to warn of, or protect against, failure or
malfunction of the electric actuator.
Features
•
•
slim profile simplifies installation and
provides application flexibility in confined
locations
1/2 in. conduit connector with 48 in. (1.2 m)
18 AWG UL CMP plenum cable meets
local code requirements for wiring in air
plenums, and simplifies field wiring for
retrofit jobs
•
•
•
•
•
automatic stroke calibration at installation
reduces installation time and costs, since
the actuator self adjusts
reversible mounting design provides
Clockwise (CW) or Counterclockwise
(CCW) return-to-normal positioning if a
power loss occurs
electronic stall detection throughout the
entire rotation range extends the life of the
actuator by deactivating the actuator motor
when an overload condition is detected
removable coupler enables actuator stroke
adjustment, and/or adapts to a shorter
damper shaft
integral auxiliary switch (RJ-120-S model)
provides an adjustable switch point with
AC 120/240 capability
extended ambient operating temperature
limits of -25 to 140°F (-32 to 60°C) meet the
temperature requirements of outside air
applications
Product Details
The RJ-120 and RJ-120-S On/Off Electric
Spring Return Actuators are designed to
position air dampers and valves in Heating,
Ventilating, and Air Conditioning (HVAC)
systems. Applications include:
On/Off Electric
Spring Return Actuator
•
positioning return air, exhaust air, or
outside air dampers
• positioning face and bypass dampers
Refer to the manufacturer’s information to
properly size the damper and/or electric
actuator.
Repairs and Replacement
If the RJ-120 or RJ-120-S On/Off Electric
Spring Return Actuator fails to operate within
its specifications, replace the unit. For a
replacement electric actuator, contact
Ruskin Company.
21
22
23
21
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switch
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BLK/ BLK/ BLK/
RED BLU GRY
22
21
23
AC 120 V 60 Hz
Control Wiring Diagram
Auxiliary Switch
Wiring Diagram for
RJ-120-S Model
The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult Ruskin Company.
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®
On/Off Electric Spring Return Actuators (Continued)
34
-1
24
2-X
X
1-7/32 (31)
A
4-29/32
(125)
3
(76)
6-31/32
(177)
1-11/32 (34)
Maximum
dimensions
3-1/4
(83)
On/Off Electric Spring Return Actuator Dimensions, in. (mm)
Technical Specifications
RJ-120 and RJ-120-S On/Off Electric Spring Return Actuators
Power Requirements
Nominal AC 120 V ±10% at 60 Hz, Typical 11.0 VA Running, 9.2 VA Holding Position
Transformer Sizing Requirements
14 VA Minimum per Actuator
Input Signal
AC 108 to 132 V at 60 Hz
Auxiliary Switch Rating
RJ-120-S Model
One Single-Pole, Double-Throw (SPDT), Double-Insulated Switch;
AC 24 V, 50 VA Pilot Duty;
AC 120 V, 5.8 A Resistive, 1/4 hp, 275 VA Pilot Duty;
AC 240 V, 2.9 A Inductive, 5.0 A Resistive, 1/4 hp, 275 VA Pilot Duty
Spring Return
Direction is Selectable with Mounting Position of Actuator: CCW Actuator Face Away from
Damper for CCW Spring Return; CW Actuator Face Away from Damper for CW Spring Return
Running and Spring Return Torque
53 lb·in (6 N·m)
Rotation Range
Adjustable from 34.5 to 90° CW or CCW; Mechanically Limited to 93°
Rotation Time
10 to 40 Seconds for 0 to 53 lb·in (0 to 6 N·m) at All Operating Conditions
Spring Return Time
No Power (Off)
Nominal 35 Seconds; 70 Seconds Maximum
Cycles
60,000 Full Stroke Cycles
Audible Noise Rating
55 dBA Nominal at 39-13/32 in. (1 m)
Electrical Connections
48 in. (1.2 m) 18 AWG UL CMP Plenum Cable with 1/4 in. (6 mm) Stripped Wire Leads
Conduit Exit
One 1/2 in. National Pipe Straight Loose (NPSL) Exit
Mechanical Connections
3/8 to 1/2 in. (10 to 13 mm) Diameter Round Shaft or 3/8 in. (10 mm) Square Shaft
NEMA 2 (IP42)
Enclosure
Ambient Conditions
Compliance
Operating
-25 to 140°F (-32 to 60°C); 90% RH Maximum, Noncondensing
Storage
-40 to 185°F (-40 to 85°C); 95% RH Maximum, Noncondensing
North America
UL Listed, File E27734, CCN XAPX (United States) and XAPX7 (Canada)
Actuator Housing is Plenum Rated per CSA C22.2 No. 236/UL 1995, Heating and Cooling
Equipment
European Union
CE Mark, EMC Directive 89/336/EEC
CE Mark, Low Voltage Directive 73/23/EEC
Shipping Weight
3.5 lb (1.6 kg)
The performance specifications are nominal and conform to acceptable industry standards. For applications at conditions beyond these specifications, consult Ruskin Company.
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