LCU - Take Control of the Economizer Actuator with 0 - 10 VDC Signal on unit With or Without ReliaTel or Symbio Control
Sometimes the controls contractor (non-Trane) will want to take control of the economizer or motorized damper actuator. They normally want to modulate the actuator with a 2-10 volt DC signal.
Other Question/Problem/Cause Statements
- How can I Take Control of the Economizer Actuator with 0 - 10 VDC Signal?
- Can an outside vendor take control of our economizer?
- How can a non-Trane contractor take control of our economizer?
- How can I control the economizer to open fully when fan is running and close the economizer shut when unit is off?
- How can the economizer open 100% when fan is running and shut closed when unit is turned off?
- Can a third party take control of a Trane economizer?
- Taking Control of the Economizer Actuator with 0 - 10 VDC Signal
Electro-Mechanical Precedent, Voyager UCP, & Voyager III Constant Volume
If it is an Electro-Mechanical economizer, the Honeywell W7459A actuator does not have the terminals for it to be directly controlled by external inputs. However, if the actuator is removed and is replaced with the Honeywell W7399A1004 (part #MOD1301), which has a 2-10 volt input, it can be modulated. This is the ReliaTel model actuator (only) and connections can be made directly. (This actuator is a smart actuator, not a floating point actuator).
Precedent ReliaTel, Voyager ReliaTel, & Precedent Electro-Mechanical (Gray actuator only [Released Sept 2013]) NEW Precedent Symbio
On the Economizer Control Actuator, remove the screw in the center of the actuator module. Remove the actuator module (this will not be used). Then, remove the wiring from the module. (Skip this step for Precedent with Symbio)
Terminals that are exposed by removal of the actuator module are 1/4" spades labeled 24 VAC, TR & TR1 and 2-10 VDC IN (+/-).
Apply 24 VAC to TR and TR1 and 2-10 VDC signal to (+/-) on 2-10 VDC IN. (This is can be infinite points)
DO NOT USE the lower terminals labeled 2-10 VDC OUT for control, they can be used as a feedback to the 3rd party BAS.
WARNING:
Information in this article is intended for use by individuals possessing adequate backgrounds of electrical and mechanical experience and who comply with all federal, state, and local laws, rules, orders, or regulations related to the installation, service, or repair of a heating or central air conditioning product. Any attempt to install, service, or repair a heating or central air conditioning product may result in personal injury and/or property damage. The manufacturer or seller cannot be responsible for the interpretation of the information contained herein, nor can it assume any liability in connection with its use.