All installations and services must be performed by qualified service personnel.
9
Once the selected Blower On Delay time has be reached, the blower operation will change to the
operation described in Motor Blower Speed.
Speed Selection Values
Three dip switches select 8 cooling speeds. Dependant fan, and dehumidification speeds are
selected by the same switches, their tabular values are enacted when their function is called. Three
additional dip switches select 8 heating speeds which are enacted when heat is called. This allows
independent selection of heating and cooling capacity parameters. See the CFM Tables for speeds.
F. CFM TABLES
The following tables contain blower speed settings and their respective air flow rates for the ECM blower
motor. To change air flow rates from that of the shipped settings, use the respective SW1 dipswitch on
the furnace’s integrated control board (see Figure 3).
OH6FA072DV4
Heating Speed Set-ups
Low Fire
Med Fire
High Fire
Static Pressure (Amps/Watts)
BTUH
60,000
72,000
90,000
Fan
Control
SW 1
Switch
Settings
Heating
CFM
Aprox. Rise
(F
0
)
Aprox. Rise
(F
0
)
Aprox. Rise
(F
0
)
0.2
0.5
3-OFF
2-OFF
1-OFF
740
75
o
1.1/98
1.8/173
3-OFF
2-OFF
1-ON
812
68
o
82
o
1.3/114
2.1/193
3-OFF
2-ON
1-OFF
883
63
o
76
o
1.5/129
2.4/218
Factory SW1
Switch
Settings
3-OFF
2-ON
1-ON
968
57
o
69
o
86
o
1.7/148
2.4/223
3-ON
2-OFF
1-OFF
1054
63
o
79
o
1.9/173
2.7/246
3-ON
2-OFF
1-ON
1153
58
o
72
o
2.3/207
3.0/283
3-ON
2-ON
1-OFF
1267
66
o
2.7/247
3.5/332
3-ON
2-ON
1-ON
1424
58
o
3.4/315
4.3/409
= Recommended Heating Speed Setting
NOTE: Electrical data provided for Ultratech motor
OH6FA072DV4
