Before connecting the thermostat, check to make sure the wires will be long enough for servicing at a later date. Make sure that thermostat wire is long enough to facilitate future removal of blower for service.
Complete the wiring connections to the equipment. Use the provided unit wiring diagram and the field wiring diagram shown in Figure 33. Use 18 gauge wire or larger that is suitable for Class II rating for thermostat connections.
Electrically ground the unit according to local codes or, in the absence of local codes, according to the current National Electric Code (ANSI/NFPA No. 70). A green ground wire is provided in the field
NOTE: This furnace contains electronic components that are polarity sensitive. Make sure that the furnace is wired correctly and is properly grounded.
Accessory Terminals
One line voltage “EAC” 1/4" spade terminal is provided on the furnace integrated control. See figure 34 for integrated control configuration. This terminal is energized when the indoor blower is operating. Any accessory rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. If an accessory rated at greater than one amp is connected to this terminal, it is necessary to use an external relay.
One line voltage “HUM” 1/4" spade terminal is provided on the furnace integrated control. See Figure 34 for integrated control configuration. This terminal is energized in the heating mode when the combustion air inducer is operating. Any humidifier rated up to one amp can be connected to this terminal with the neutral leg of the circuit being connected to one of the provided neutral terminals. If a humidifier rated at greater than one amp is connected to this terminal, it is necessary to use an external relay relay.
Generator Use - Voltage Requirements
The following requirements must be kept in mind when specifying a generator for use with this equipment:
•The furnace requires 120 volts ± 10% (Range: 108 volts to 132 volts).
•The furnace operates at 60 Hz ± 5% (Range: 57 Hz to 63 Hz).
•The furnace integrated control requires both polarity and proper ground. Both polarity and proper grounding should be checked before attempting to operate the furnace on either permanent or temporary power.
•Generator should have a wave form distortion of less than 5% RHO.
Thermostat
Install the room thermostat according to the instructions provided with the thermostat. See Figure 31 for thermostat designations. If the furnace is being matched with a heat pump, refer to the FM21 installation instruction or appropriate dual fuel thermostat instructions.
Condensing Unit Thermostat Designations
(Refer to Specific Thermostat and Outdoor Unit.)
*Note: “R” Required on some outdoor units.
Figure 31
Indoor Blower Speeds
1.When the thermostat is set to “FAN ON,” the indoor blower will run continuously on the heating speed when there is no cooling or heating demand.
2.When the unit is running in the heating mode, the indoor blower will run on the heating speed.
3.When there is a cooling demand, the indoor blower will run on the cooling speed.
Page 26 of 39 | Issue 1031 |
