Service manual

23
13.2.9 MODE 4 & 5: OUTDOOR RESET OPERATION: ADJUST DISPLAY
From the Home display;
1) Press simultaneously to view the following parameters:
Display
Parameter
Name
Parameter Description Parameter Range
Mode Operating mode for the boiler.
1 to 6
Default = 1
Outdoor
Start
Temperature
Outdoor starting temperature used in
the reset ratio for the heating system.
Typically set to the desired building
temperature.
35 to 85
o
F
(2 to 29
o
C)
Default = 60
o
F
(21
o
C)
Outdoor
Design
Temperature
Outdoor design temperature used in
the reset ratio for the heating system.
Set to the coldest annual outdoor
temperature in the local area.
-60 to 50
o
F
(-51 to 10
o
C)
Default = -10
o
F
(-23
o
C)
Boiler Start
Temperature
Starting water temperature used in the
reset ratio calculation for the heating
system. Typically set to the desired
building temperature.
35 to 150
o
F
(2 to 66
o
C)
Default = 70
o
F
(21
o
C)
Boiler
Design
Temperature
Boiler design water temperature used
in the reset ratio calculation for the
heating system. Set to the boiler water
temperature required to heat the
building on the coldest annual outdoor
temperature.
70 to 230
o
F
(21 to 110
o
C)
Default = 180
o
F
(82
o
C)
Boil Mass
(Mode 2
ONLY)
Thermal mass of boiler. This
determines interstage delay and
minimum on and minimum off times.
1 to 3
Default = 1
Differential
Temperature
To provide a modulation rate above
and below the Boiler Target
temperature. For example, if the value
is 10
o
F and the Boiler Target is 160
o
F
the boiler will begin to modulate at
150
o
F and shut off at 170
o
F.
Au, 2 to 42
o
F
(Au, -16 to 5
o
C)
Default = 10
o
F