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Powermite 599 Series
MZ Series SSB Electronic Valve
Actuator
24 Vac 3-position (Floating) Control
Technical Instructions
Document No. 155-195P25
EA 599-13
December 18, 2003
Description
Features
Application
Product Number
Ordering
Information
EA0579R2
The Powermite 599 MZ Series SSB electronic valve actuator requires a 24 Vac supply
floating control signal to provide three-position control. This actuator is designed to
work with Powermite 599 MZ Series zone control valves with a 7/32-inch (5.5 mm)
stroke and a threaded valve bonnet that fits the actuator.
• UL listed for plenum installations.
• Direct-coupled installation without tools.
• Manual override
• Visual position indication.
For use in heating and cooling HVAC applications with Powermite 599 MZ Series
valves that need 45 lb. (200N) nominal force. They can be used in liquid and steam
service applications.
SSB81U Actuator prefix code 254
To order a complete valve plus actuator assembly from the factory, combine the
actuator prefix code with the suffix of the valve product number. See Technical Bulletin
TB 252 (155-307P25) for selection procedures.
To order an actuator only, use the product number.
Warning/Caution Notations
Siemens Building Technologies, Inc.
WARNING:
CAUTION:
Personal injury or loss of life may occur if you do not perform
a procedure as specified.
Equipment damage may occur if you do not follow procedure
as specified.
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Technical Instructions Powermite 599 MZ Series SSB Electronic Valve Actuator
Document No. 155-195P25 24 Vac 3-position Control
December 18, 2003
Specifications
Operating voltage 24 Vac ±20%
Power supply
Frequency 50/60 Hz
Power consumption 0.8 VA
Function
Running time
60 Hz 150 seconds
50 Hz 180 seconds
Nominal stroke 7/32-inch (5.5 mm)
Nominal force 45 lbs. (200N)
Agency certification
UL listed to UL873
cUL certified to Canadian Standard
C22.2 No. 24-93
Ambient conditions
Ambient temperature
Operation 34°F to 122°F (1°C to 50°C)
Transport and storage -13°F to 158°F (-25°C to 70°C)
Miscellaneous
Medium temperature 34°F to 230°F (1°C to 110°C)
Dimensions See Figure 8
Weight 9 oz. (0.25 kg)
Accessory
Service Kits
ASY97 Conduit connector
quantity one (1).
EA0643R1
Figure 1. Conduit Connector.
ASY99 Terminal plug and terminal block
cover for SSB81U
Y1 Y2
EA0581R1
G
EA0859R1
quantity one (1).
Figure 2. Terminal Plug and block cover.
3mm
4 224 5611 8 Visual Position Kit to
replace one indicator and two gears.
EAO808R1
(Previous version)
Figure 3. Visual Position Kit.
ASY98 Replacement screw and nut for use on the conduit connector or the terminal
connector, quantity one each.
Page 2 Siemens Building Technologies, Inc.
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Powermite 599 MZ Series SSB Electronic Valve Actuator Technical Instructions
24 Vac 3-position Control Document No. 155-195P25
December 18, 2003
Operation
Mounting and
Installation
A 24 Vac control signal to the Y1 extends the actuator output shaft.
A 24 Vac control signal to the Y2 retracts the actuator output shaft.
The stroke travel is proportional to the length of time the signal is applied. With no
control voltage or in the event of a power failure, the actuator maintains its last position.
NOTE: Do not attempt to operate an actuator if it is not attached to a valve. In this
situation, the actuator will only respond to a signal on terminal Y1, and drive to
the full stroke position. It will then hold at the full stroke position.
Only by attaching the actuator to a valve, or by manually depressing the
actuator stem to engage an internal micro-switch, will the actuator respond to
a signal on terminal Y2.
EA0849R2
Figure 4. Mounting Position.
Mount the actuator in one of the allowable positions shown in Figure 4.
When mounting the actuator in a plenum, the proper cable must be attached to meet
local codes.
Wiring
Allow 8 inches (200 mm) above the actuator and 8 inches (200 mm) behind the cable
for service.
Installation Instructions are included with the actuator.
Do not use autotransformers. Use earth ground isolating step-down Class 2 power
supplies.
Determine supply transformer rating by summing total VA of all actuators used.
It is recommended that one transformer power no more than 10 actuators.
See Table 1 for terminal connections.
Y2
0
Y1
1
G
24
NEUT
Vac
EA0585R1
EARTH GROUND
ISOLATING CLASS 2
TRANSFORMER FOR
24 Vac POWER
120 Vac
Siemens Building Technologies, Inc. Page 3
Figure 5. Terminal Connections of the SSB81U.
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Technical Instructions Powermite 599 MZ Series SSB Electronic Valve Actuator
Document No. 155-195P25 24 Vac 3-position Control
December 18, 2003
Wiring, Continued
Table 1. Terminal Connections.
Standard
1 Supply (SP) G
6 Control signal: Outward
7 Control signal: Inward
Manual Override
Function Terminal
Symbol
Connection
Y1
movement of the actuator
output shaft
Y2
movement of the actuator
output shaft
WARNING:
Terminal connection "G" is Common, not ground.
For manual positioning, turn the manual override knob in the center of the position
indicator. See Figure 6. Turn clockwise to move the output shaft outward.
The actuator will maintain its position until power is provided or restored.
A
B
Note:
When knob is turned
counterclockwise (A), the
spindle is retracted.
When knob is turned
clockwise (B), the spindle
is extended
Figure 6.
Page 4 Siemens Building Technologies, Inc.
EA0587R3
AB
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Powermite 599 MZ Series SSB Electronic Valve Actuator Technical Instructions
24 Vac 3-position Control Document No. 155-195P25
December 18, 2003
Start-Up
Troubleshooting
Service Kits
Check the wiring and the position indication.
EA0588R3
Position indicator at 0
(Output shaft is retracted)
Position indicator at 1
(Output shaft is extended)
Figure 7. Position Indicator.
Check Wiring for proper connections.
See Accessory and Service Kits for available accessory and service parts.
If the actuator is inoperative, replace the unit.
Dimensions
3-7/8
(98)
Service envelope
EA0589R2
Figure 8.
Dimensions of the SSB Actuator. Dimensions Shown in Inches (Millimeters).
Minimum access space recommended:
3-1/4
(83)
8 inches (200 mm) above the actuator and beside the terminal plug.
Information in this publication is based on current specifications. The company reserves the right to make changes in specifications and models as
design improvements are introduced. Other product or company names mentioned herein may be the trademarks of their respective owners. ©
2003 Siemens Building Technologies, Inc.
Siemens Building Technologies, Inc.
1000 Deerfield Parkway
Buffalo Grove, IL 60089-4513
U.S.A.
Your feedback is important to us. If you have comments
about this document, please send them to
technical.editor@siemens.com
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Document No. 155-195P25
Printed in the U.S.A.
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