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Holiday:
SE T T ING HOL I DAY 05
H
OL#XX XX—XX—XX
Thirty two holidays are
selectable (01-32)
Month:
01 thru 12
Day:
01 thru 31
Year:
01 to 99; Below 01 is
Repeating Holiday (RH) setting
RS T RAT I O X . XX : 1 0 6
XX X . X@7 0 XXX . X@XX
Default:
System temperature at 70°F (21.1°C)
140°F @ 70°F (60°C @ 21.1°C)
Ratio of outdoor temperature to water system
temperature. Range: . 01:1 to 8:1 or "None" for
constant water temperature
(then TARGET=SETPOINT). Default value is 1.00:1.
Screen number
Screen number
Default:
System temperature at °F
This value is 200°F @ 10°F (93.3°C @ -12.2°C)
Reset Ratio:
The Reset Parameter
Sets the desired change in system. Water temperature
increases as the outdoor temperature decreases. The
reset ratio selector is used to determine the rate of
change of the boiler(s) output water temperature rela-
tive to a change in the outdoor temperature. The first
number of the ratio refers to the outdoor temperature
and the second number refers to the degree(s) of
change for the water temperature, e.g., a ratio of 2:1
means for every 2° change in outdoor temperature,
the System Temperature will change 1°. (The reset
temp cannot exceed the temp limits set on screen
#08.)
Example: Setpoint = 135°F
NOTE: Previous screen (04) is used for entering the
offset value in degrees.
NOTE: The reset ratio can be modified by changing
either the ratio value in line #1 or the system
temperature value in line #2.
NOTE: When the reset ratio selected is "NONE",
line 2 disappears.
NOTE: Use reset ratio "NONE" when using this
controller for domestic hot water or pool applications.
Ratio
Temperature °F
Outdoor System
2:1
70 135
60 140
40 150
20 160
Table G: Outdoor to System Temperature Ratio