Lochinvar Harmony Reset, Outdoor Cutoff, Default 64F, MINIMUM WATER TEMPERATURE Default 70F

RESET

---	RESET RATIO ---		ADJUST	After
1.00°OD = 1.50°Sys
			selecting
>1.00°OD = 1.25°Sys
			PRESS TO SELECT	Ratio
1.00°OD = 1.00°Sys
-----	OFFSET	----	ADJUST	Turn to
	Value			adjust
			PRESS TO SELECT	Offset

• In a new installation, start with an Offset value of 0°.

• Adjust the Offset value in mild weather. If the ambient indoor

temperatures are warm in the warm weather, decrease the Offset. If

the ambient building temperatures are cold in the mild weather,

increase the Offset.

• The rule of thumb for baseboard radiation is to change the Offset by

4° for every degree you wish to change the building temperatures.

For radiant heat applications, change the Offset by 1° or 2° for every

degree you wish to change the building temperature.

SETTINGS

----- OFFSET ----

Value -> New Value

-----OFFSET ----

Value -> New Value

-- OUTDOOR CUTOFF --

Value

-- OUTDOOR CUTOFF --

Value -> New Value

ADJUST	Press to
	select
PRESS TO SELECT	new

ADJUST	After
selecting
PRESS TO SELECT	Offset
ADJUST	Turn to
	adjust
PRESS TO SELECT	Cutoff
ADJUST	Press to
	select
PRESS TO SELECT	new

• The Offset can be set from -50to 50°F.

OUTDOOR CUTOFF Default 64°F

•The Outdoor Cutoff sets at what outdoor temperature the Harmony will begin heating.

•When the outdoor temperature is above the Outdoor Cutoff tem- perature, the Harmony will not activate stages. The Set Point water temperature will read Off.

•When the outdoor temperature drops to the Outdoor Cutoff tem- perature, the Harmony will activate the SYS relay, compute the Set Point water temperature, and sequence and modulate Stages to hold that Set Point.

•The Outdoor Cutoff has a built in 2°F differential. Once the SYS relay has been activated, it will remain activated until the outdoor tempera- ture rises to 2°F above the Outdoor Cutoff temperature.

•If the building is too cold before the system starts, raise the Outdoor Cutoff temperature.

•The Outdoor Cutoff temperature can be set Off, On, or from 30 to 75°F.

•Setting the Outdoor Cutoff to Off may be used to disable the heating system during summer, during maintenance, or whenever no heat is required for a prolonged period of time regardless of outdoor temperature.

•Setting the Outdoor Cutoff to On means the heating system will run regardless of outdoor temperature. In mild weather, the lowest calculated Set Point will be determined by the Minimum Water Temperature (next).

-- OUTDOOR CUTOFF --

Value -> New Value

-MINIMUM WATER TEMP-

Value

-MINIMUM WATER TEMP-

Value -> New Value

ADJUST	After
selecting
PRESS TO SELECT	Cutoff
ADJUST	Turn to
	adjust
PRESS TO SELECTMinimum
ADJUST	Press to
	select
PRESS TO SELECT	new

MINIMUM WATER TEMPERATURE Default 70°F

•Most boilers require a minimum temperature for the water returning from the system to the boiler.

•The Harmony controls the system temperature which is measured at the sensor location. Depending on the piping configuration and sensor location, the return temperature may vary significantly from that measured by the Harmony.

•Check with the manufacturer for the appropriate Minimum Water Temperature setting at the Harmony's sensor to meet the boiler's requirements.

•The Harmony will use the Minimum Water Temperature as the Set Point whenever it is higher than the calculated value determined by the outdoor temperature, Reset Ratio, and Offset.

•The Minimum Water Temperature can be set from 70 to 180°F.

IMPORTANT: If the Minimum Water Temperature is not set correctly, boiler life may be significantly shortened.

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