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All installations and services must be performed by qualified service personnel.
5
B. CFM TABLES
The following tables contain blower speed settings and their respective airflow rates for the ECM blower motor. To
change airflow rates from that of the shipped settings, use the respective S3 and S4 dip switches on the furnace’s
integrated control board (see Figure 1).
S4 DIP SWITCH - HEATING SPEED SELECTIONS
NOTE: Electrical data provided for Ultratech motor
0.2 0.5 0.2 0.5
S4-3 OFF
S4-4 OFF
760 60 1.4 / 109 2.1 / 175 931 70 2.0 / 163 2.8 / 239
S4-3 ON
S4-4 OFF
708 65 1.2 / 95 1.9 / 154 867 75 1.7 / 138 2.4 / 205
S4-3 OFF
S4-4 ON
826 55 1.7 / 132 2.3 / 195 1012 65 2.3 / 197 3.1 / 269
S4-3 ON
S4-4 ON
909 50 1.9 / 155 2.7 / 227 1114 59 2.8 / 238 3.3 / 289
0.2 0.5 0.2 0.5
S4-3 OFF
S4-4 OFF
1015 60 1.8 / 151 2.7 / 230 1243 70 2.6 / 221 3.6 / 314
S4-3 ON
S4-4 OFF
947 64 1.7 / 136 2.4 / 206 1160 75 2.3 / 192 3.2 / 278
S4-3 OFF
S4-4 ON
1094 56 2.1 / 180 3.0 / 258 1340 65 2.1 / 269 4.2 / 374
S4-3 ON
S4-4 ON
1184 51 2.4 / 209 3.4 / 299 1450 60 3.7 / 327 4.7 / 428
0.2 0.5 0.2 0.5
S4-3 OFF
S4-4 OFF
1270 60 2.9 / 247 3.8 / 343 1556 70 4.5 / 406 5.5 / 508
S4-3 ON
S4-4 OFF
1185 64 2.5 / 218 3.4 / 300 1452 75 3.9 / 354 4.7 / 436
S4-3 OFF
S4-4 ON
1366 56 3.4 / 294 4.4 / 385 1673 65 5.3 / 481 6.3 / 581
S4-3 ON
S4-4 ON
1480 51 3.9 / 354 4.9 / 431 1813 60 6.3 / 580 7.5 / 693
=FACTORY SETTING
CHX3-125
Dip sw itch
settings
Low fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)
High Fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)
CHX3-100
Dip sw itch
settings
Low fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)
High Fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)
CHX3-75
Dip sw itch
settings
Low fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)
High Fire
CFM
Rise (
o
F)
Static Pressure (Amps /
Watts)