International comfort products F9MXT0401410A Service And Technical Support Manual page 27

SERVICE AND TECHNICAL SUPPORT MANUAL
TwoïStage Furnace with TwoïStage
Figure 20
Heat Pump (Dual Fuel)
AC with TwoïStage Furnace, Humidifier,
Figure 21
and Dehumidification
For Figure 17 ï Figure 22
1. Refer to outdoor equipment Installation Instructions for additional information and setup procedure.
2. Outdoor Air Temperature Sensor must be attached in all dual fuel application.
3. Refer to ICP thermostat Installation Instructions for additional information and setup procedure.
4. When using a Humidity Sensing Thermostat, set DEHUMIDIFY OPTIONS to H DEïENRGZD FOR DEHUM
5. Optional connection for TwoïStage: If wire is connected, SW1ï1(TT) on furnace control should be set to ON position to allow
ICP Thermostat to control the furnace staging.
6. HUM 24VAC terminal is 24 VAC and is energized when the low pressure switch closes during a call for heat.
7. When connecting 115 VAC to humidifier use a separate 115 VAC supply.
8. When using a humidifier on a HP installation, connect humidifier to hot water.
27
Figure 22
Figure 23
Specifications subject to change without notice.
Gas Furnace: (F/G)9MXT
HP with TwoïStage Furnace, Humidifier,
and Dehumidification
TwoïStage Furnace and Humidifier Only
440 04 4321 02