INSTALLATION AND OPERATION MANUAL TWO STAGE CONDENSING GAS FURNACE CHX1-75N, CDX1-75N, CHX1-100N, CDX1-100N, CHX1-125N, CDX1-125N

All installations and services must be performed by qualified service personnel.
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Modifications to ECM blower speed settings are done using the S3 and S4 dip switch controls. (Labeled 1
to 8 in Figure 21). Thermo Pride two-stage furnaces are factory shipped at the CFM settings listed below
in Table 4.
2-Stage Blower Settings (from factory)
Table 4
Unit
Control Board
Dip Switch
Settings
Heating
CFM
(low fire)
Heating
CFM
(high fire)
Constant Fan
CFM
Cooling
CFM
CDX1-75
1-7 Off
8 On
885 1012 500 1000
CHX1-75
1-8 Off 760 931 500 1000
CDX1-100
1-7 Off
8 On
1094 1340 600 1200
CHX1-100
1-8 Off 1015 1243 600 1200
CDX1-125
1-7 Off
8 On
1366 1673 700 1400
CHX1-125
1-8 Off 1270 1556 700 1400
For adjustments to the Cooling CFM settings, as well as all additional CFM changes, please reference the
dip switch tables listed in the ECM operation manual. (Included with every furnace.)
5. FIELD WIRING AND REPLACING WIRING
Field wiring between the furnace and devices not attached to the furnace shall conform with the
temperature limitation for Type T wire[63°F rise (35°C)] when installed in accordance with the
manufacturer’s instructions. If any of the original factory supplied furnace wiring is replaced or a separate
device other than the thermostat is wired internal to the unit 105°C thermoplastic or equivalent wire must
be used.