Lochinvar Harmony Installation Input Wiring, EMS Sourcing Current, Wiring The Shutdown, Ems Input

Harmony Sources Current 24VDC Excitation Voltage

EMS INPUT

+ SIGNAL	(-)	EMS
	(+)	Input
SHIELD

EMS Sourcing Current

EMS INPUT

+ SIGNAL	(-)	EMS
	(+)	Input
SHIELD

CONNECTING AN EXTERNAL SET POINT (4-20mA EMS-CONTROL)

•The Harmony can take a 4-20mA signal from an Energy Manage- ment System (EMS) or other signal source to change the set point remotely (see pg. 28 for additional details).

•The signal must be a two-wire 4-20mA.

•A system sensor must be installed as described in the previous section.

•The External Set Point must be set up correctly (see pg. 12). These settings will allow the Harmony to read and monitor the system temperature and also monitor the 4-20mA input to remotely adjust the Harmony set point to the desired value.

•The Harmony can source the current for the 4-20mA input. It provides an excitation voltage of 24VDC. If using the Harmony to source the power, attach the (+) side of the 4-20mA input to the Harmony EMS terminal marked +. Attach the (-) side of the 4-20mA signal to the EMS terminal marked SIGNAL.

•If the EMS or other signal sources the current (provides the excitation voltage), attach the (+) side of the 4-20mA input to the Harmony EMS terminal marked SIGNAL. Attach the (-) side of the 4-20mA input to the EMS terminal marked SHIELD.

INSTALLATION INPUT WIRING

INPUTS
A1	T
	TEMP
A2
A3	SHUTDOWN
A4
A5	+
A6	S
A7	NETWORK
A8
A9	SYSTEM
A10	PROVE

Dry Contact

Shutdown

Signal

WIRING THE SHUTDOWN

•This feature can be used whenever it is desirable to turn off the Harmony from a remote location or another controller.

•A typical use for this feature would be to turn off all boiler stages when an EMS panel no longer requires heat in the system.

•When the Shutdown feature is enabled by closing a dry contact, all active stages will immediately modulate down to low. They will remain in low for 45 seconds and then turn off.

•If the System Output relay was active, it will remain active until the System Delay is over, then it will also turn off.

•The Shutdown signal must be a dry contact only. No voltage can be placed across the SHUTDOWN terminals.

•Bring the two wires from the dry contact to the terminals marked SHUTDOWN- A3, A4.

WIRING THE SYSTEM PROVE

5