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39
50
32
41
1
67
158
149
131
122
113
104
77
59
68
86
95
2
12
203
194
185
176
201˚
SUPPLY OUTLET TEMPERATURE (F)
-24
-59 -41
OUTSIDE TEMPERATURE (F)
-9
9
27
63
45
81
99
FUNCTION 9
FUNCTION 11
FUNCTION 8
FUNCTION 10
0
68˚5˚
DEFAULT RESET CURVE
OUTDOOR RESET CURVE
Factory Default
NOTE: It is important to note that the user can
adjust the heat curve down by adjusting the central
heating temperature to a lower setting.
Fig. 33: Outdoor Reset Curve — Factory Default
Fig. 34: Outdoor Reset Curve — Plot Your Curve
50
OUTSIDE TEMPERATURE (F)
-59
32
41
-41
-24
27
9
-9
0
81
45
63
99
Plot your Curve
OUTDOOR RESET CURVE
SUPPLY OUTLET TEMPERATURE (F)
167
104
77
59
68
86
95
131
113
122
149
158
194
176
185
203
212
Installer Menu
The installer menu consists of several items that can
be adjusted. To access the installer menu, press and
hold the ENTER/MENU key for 5 seconds. Using the
UP and DOWN, and LEFT and RIGHT arrow keys,
enter 925, then press ENTER/MENU. Scroll through
the list of adjustable items by pressing the LEFT or
RIGHT arrow keys. Once the desired item is dis-
played, press the ENTER/MENU key to select it. The
screen will begin to flash. Press the DOWN arrow key
to decrease the values, and the UP arrow key to
increase them. To store the changes, press the
ENTER/MENU key. The display returns to normal
mode after one minute. Pressing the ESC/RESET key
before storing changes will restore the original value.
The central heating demand is detected when the
room thermostat closes. When an outside sensor is
also connected, the supply temperature will depend on
the factory default central heating curve which is suffi-
cient for most applications.
To set your own custom heat curve you will have to set
t
he following parameters. Use the graphs in Figs. 33
and 34 to assist you in the design of the curve.
1. Minimum outside design temperature: Function 8
2. Design Supply water temperature at the minimum
design outside temperature: Function 9
3. Maximum outside design temperature: Function
10
4. Design Supply Water Temperature at the maxi-
mum outside temperature: Function 11