BLOWER PERFORMANCE SPECIFICATIONS
21
There are dual 7-segment LED's adjacent to the selection
dipswitches. The airflow rounded to the nearest 100 CFM,
is displayed on the dual 7-segment LED's. The CFM dis-
play alternates with the operating mode.
Example:
If the airlfow demand is 1230 CFM, the LED's will display
12. If the airflow demand is 1275 CFM, the LED's will dis-
play 13.
Note:
Continuous fan speed is selectable on dip switches
5 & 6. Choices are 25, 50, 75, and 100 % of max CFM.
Circulator Blower Speed Adjustment Switches
Note:
The optional usage of a dehumidistat allows the
furnace’s circulator blower to operate at a slightly lower speed
(85% of desired speed) during a combined thermostat call
for cooling and dehumidistat call for dehumidification. This
can be done through an independent dehumidistat or through
a thermostat’s DEHUM terminal (if available). This lower
blower speed enhances dehumidification of the conditioned
air as it passes through the AC coil. For proper function, a
dehumidistat applied to this furnace must operate on 24
VAC and utilize a switch which
opens on humidity rise.
30
40
50
60
70
80
90
110
120
100
130
140
150
100
90
80
70
60
50
40
30
20
10
OUTPUT BTU/HR x 1000
BTU OUTPUT vs TEMPERATURE RISE CHART
T
E
M
P
E
R
A
T
U
R
E RI
SE
600 CFM
700
900
1000
1100
1200
1400
1600
1800
2000
2200
2400 CFM
FORMULAS
BTU OUTPUT = CFM x 1.08 x RISE
RISE =
BTU OUTPUT
1.08
÷ CFM
800
