Lochinvar Harmony Reset Settings, 8070, Reset Ratio, OFFSET Default, Press to, select, scroll

RESET RATIOS

	1:4	1:3	1:2	1:1.5
	220
	210			1:1.25
°F)
	200
(in	190			1:1
Temperature	180
	170			1.25:1
	160			1.5:1
	150			2:1
Water	140
	130			3:1
	120			4:1
	110
	100
	70 60 50 40	30	20 10	0 -10 -20

Outdoor Temperature (in °F)

	Temp
<A>	B	C	D
OFF	OFF	OFF	OFF
---	SETTINGS		---ADJUST Press to
>Set Point				show
Lead Stage			PRESS TO SELECT	Settings
Gain

RESET SETTINGS

RESET RATIO Default 1:1

•The Reset Ratio controls how much heat will be added based on outdoor temperature. The Reset Ratios are shown as Outdoor Temperature:Water Temperature.

•A 1:1 Reset Ratio signifies for each degree it gets colder outside, the Calculated water temperature will raise 1 degree.

•The other Reset Ratios are adjustable from 1:4 to 4:1.

•The Reset Ratio curves start at 70°F. At 70°F the Harmony will require 100°F water. Note that this is not the point where the Harmony will begin giving heat. That point is determined by the Outdoor Cutoff (next page). Also note that this starting point can be changed by adjusting the Offset (below).

•For new installations with standard baseboard heating, begin with a Reset Ratio of 1:1.

•For new installations with radiant heat, begin with a Reset Ratio curve of 2:1.

•Adjust the Reset Ratio value in cold weather. If the ambient indoor temperatures are cold in the cold weather, pick the next higher Reset Ratio (that is, go from 1:1 to 1:1.25). If the ambient building tempera- tures are warm in the cold weather, pick the next lower Reset Ratio (from 1:1 to 1.25:1).

•After adjusting the Reset Ratio curve, wait at least 24 hours before making another adjustment.

•To adjust the Reset Ratio, from the main display press the ADJUST/ SELECT knob to obtain the Settings menu. Select Set Point. The Reset Ratio choices will now be shown.

RESET SETTINGS

---	RESET	RATIO ---
1.00°OD =		1.25°Sys
>1.00°OD =		1.00°Sys
1.25°OD =		1.00°Sys
---	RESET	RATIO ---
1.00°OD =		1.50°Sys
>1.00°OD =		1.25°Sys
1.00°OD =		1.00°Sys
---	RESET	RATIO ---
1.00°OD =		1.50°Sys
>1.00°OD =		1.25°Sys
1.00°OD =		1.00°Sys

ADJUST	Press to
	select
PRESS TO SELECTSet Point
ADJUST	Turn to
PRESS TO SELECT	scroll
ADJUST	Press to
	select
PRESS TO SELECT	new

OFFSET Default 0

•The Offset value moves the starting point of the Reset Ratio curves (see charts below).

•Therefore, any change made to the Offset will immediately change the value of the Harmony Set Point water temperature by the same amount.

•For example, if the calculated Set Point water temperature were 150°F based on the specific outdoor temperature and Reset Ratio, then increasing the Offset from 0°F to 10°F would increase the Set Point water temperature to 160°F.

Temperature	130		1:3		1:1	Temperature	110		1:3		1:1	Temperature	150		1:3		1:1
	120						100						140
Water						Water						Water
	110				4:1		90				4:1		130				4:1
100 70			60	50	40		8070		60	50	40	120 70			60	50	40
		Outdoor Temperature						Outdoor Temperature						Outdoor Temperature
With a 0° Offset, the ratio curves						With a -20° Offset, the ratio curves						With a +20° Offset, the ratio curves
begin at 100° Water Temperature.						begin at 80° Water Temperature.						begin at 120° Water Temperature.

25