Lochinvar Harmony Output Wiring, Ems Input, Wiring A Setback, Connecting An Outdoor Sensor

EMS INPUT

+
SIGNAL	SHIELD

Dry Contact

Setback

Signal

WIRING A SETBACK

•The Setback feature can be used to provide the Harmony with a lower temperature Set Point when less load is required.

•A typical use for Setback is to lower the system temperature during the night or on the weekends when a building is unoccupied, but a minimum level of heat is still required.

•The Setback feature can not be used with External Set Point (4-20mA EMS-control) or Reset operation (see Startup Settings, pg. 11).

•To adjust the amount of Setback see pg. 19.

•The Setback signal is wired into the EMS terminals (Terminals SIGNAL and SHIELD).

•The Setback signal must be a dry contact only. No voltage can be placed across the EMS SIGNAL and SHIELD terminals.

•When the EMS SIGNAL and SHIELD are closed, the Setback is enabled and the Harmony will hold the lower Set Point. The lower Set Point will appear on the main display indicating this condition.

•When the closure is removed, the Harmony will revert to the higher saved Set Point.

Note: The Setback is not equivalent to the 4-20mA input, even though both wire into the EMS terminals. The 4-20mA input requires a 4- 20mA source which changes the Set Point in one degree increments. The Setback provides a single lower Set Point.

INSTALLATION INPUT WIRING

A5	+
A6	S
A7	NETWORK
A8
A9		SYSTEM
A10		PROVE
A11	T	OUT	To Outdoor
			Sensor Mounted
A12		TEMP
			in Shade

CONNECTING AN OUTDOOR SENSOR

For Reset Operation

• To enable the reset function, see System Startup settings, pg. 11.

For Outdoor Cutoff

•The Harmony will disable all stages when the outdoor temperature is above the adjustable Outdoor Cutoff temperature.

•This feature will automatically be activated when an outdoor sensor is connected.

•To adjust the Outdoor Cutoff temperature see pg. 26.

Installing the sensor

•For outdoor sensor use the outdoor sensor.

•Locate the sensor in the shade on the north side of the building

•Be sure the location is out of direct sunlight, and away from doors, windows, exhaust fans, vents, or other possible heat sources

•The sensor should be mounted at least 4 inches away from the building wall and approximately 10 feet above ground level

•The sensor wires can be extended up to 500' using shielded 2 conductor cable (Belden #8760 or equivalent).

•Do not run sensor wires in conduit with line voltage wiring.

•Temperature sensors have no polarity. Connect either wire from the outdoor sensor to one of the Harmony terminals marked OUTDOOR (Terminals A11&A12).

•Connect the other sensor wire to the other OUTDOOR terminal.

•Connect the shield to the circled terminal OUTDOOR (Terminal A12) with one of the sensor wires.

OUTPUT WIRING

7