Harman PB 105, Owner'S Manual

Page: 26 / 52

26
3-90-07205R26_10/14
Outdoor Air Reset Operation
Pellet
Boiler
Outdoor
Air
Reset
Operation
When
the
outdoor
sensor
is
installed,
at
20°
F
. or
below
OA
T
(Outdoor
Air
Temperature),
the
boiler
will
operate
at
the
temperature
set
on
the
Maximum
Temperature
knob.
The
boiler
water
temperature
will
decrease
by
1°
for
every
1°
in
temperature
rise
of
the
Outside
Air
.
Example
1
OA
T
W
ater
T
emp
Degree
Change
Max
set
at
185°
65°
140°
-45°
Min
set
at
140°
60°
145°
-40°
55°
150°
-35°
50°
155°
-30°
45°
160°
-25°
40°
165°
-20°
35°
170°
-15°
30°
175°
-10°
25°
180°
-5°
20°
185°
0°
15°
185°
0°
10°
185°
0°
5°
185°
0°
0°
185°
Example
2
OA
T
W
ater
T
emp
Degree
Change
Max
set
at
180°
65°
150°
*
Min
set
at
150°
60°
150°
*
55°
150°
*
50°
150°
-30°
45°
155°
-25°
40°
160°
-20°
35°
165°
-15°
30°
170°
-10°
25°
175°
-5°
20°
180°
0°
15°
180°
0°
10°
180°
0°
5°
180°
0°
0°
180°
0°
*
No
change
in
boiler
temperature
after
reaching
minimum
set
point
temperature.