Issue
The Drayton Theta YBM2A Valve Body / Actuator assembly is to be replaced.
Product Line
Field Devices
Environment
- Replacement
- Drayton
- Actuator
- Valve
- YBM2A
Cause
The Drayton Theta YBM2A Valve Body / Actuator assembly is obsolete.
Resolution
OVERVIEW
The Drayton Theta YBM2A Valve Body / Actuator assembly is obsolete, and there is no purpose built replacement.
The Valve Body was available in 1.1/4", 1.1/2" and 2" B.S.P. sizes and was normally installed as a mixing valve in variable temperature, constant volume, compensated heating circuits.
No Valve Body / Actuator assemblies are currently available in these sizes.
Details of the YB Valve Body may be viewed here.
VALVE BODY REPLACEMENT
To replace the YBM2A Valve Body the following is required:-
S-E Satchwell MB Valve Body of appropriate size - MB1552 (1.1/4"), MB1602 (1.1/2"), MB1652 (2")
Details of the MB Valve Body may be viewed here.
ACTUATOR REPLACEMENT
The YBM2A Actuator comprised a 3-wire electrical connection enabling it to be operated by a Mains Voltage changeover contact device as follows :-
Terminal M1 – Open signal
Terminal M2 – Close signal
Terminal M3 – Common
The YBM2A Actuator may be replaced by one or other of the following S-E Actuators :-
MD10B-230
MD20B-230 (if MD10B-230 not available)
Details of the MD10B-230 Actuator may be viewed here.
Details of the MD20B-230 Actuator may be viewed here.
N.B.
The YBM2A Actuator also included an additional 3-wire electrical connection associated with an integral S.P.C.O. Auxiliary Switch wired as follows :-
Terminal S1 – Normally Closed Contact
Terminal S2 – Common
Terminal S3 – Normally Open Contact
Where external wiring is connected to the YBM2A Actuator Auxiliary Switch then an Auxiliary Switch Kit containing a S.P.C.O. Auxiliary Switch should be installed on the MD Actuator.
Auxiliary Switch Kit MD-S1 (914-1060-000)
Details of the MD-S1 Auxiliary Switch Kit may be viewed here.
The MD-S1 Auxiliary Switch Kit should be wired as follows :-.
Terminal S1 – Common
Terminal S2 – Normally Closed Contact
Terminal S3 – Normally Open Contact
LINKAGE KIT
A Linkage Kit will also be required in order to enable the MD Actuator to be mounted on the MB Valve Body.
Linkage Kit LMD/AR-MB (914-1071-000)
Details of the LMD/AR-MB Linkage Kit may be viewed here
In such 3-wire installations the YBM2A Valve / Actuator assembly only will need to be replaced, while any associated Controller and Sensors may be retained.
