tral line is connected to the white wire and the incoming "hot" line is connected to the black wire in the furnace junction box. The furnace will not operate unless polarity and ground are properly connected. See Figure 26.
!CAUTION:
Label all wires prior to disconnection when servicing controls. Wiring errors can cause improper and dangerous operation.
Verify proper operation after servicing.
!ATTENTION:
Lors des opérations d'entretien des commandes, étiqueter tous les files avant des les déconnecter. Toute erreur de câblage peut être une source de danger et de panne.
S'assurer du bon fonctionnement de l'appareil après tout entretien.
Low Voltage Wiring
Install the thermostat per the manufacturer's instructions. The low voltage (24 volt) connec- tions from the thermostat are made at the terminal strip on the control board in the furnace. See Figure 28 for the proper connections for heating only
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| 3 Amp Fuse | Blower Off | 60 90 | 120 | 180 | ||
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| Y |
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Connect | HUM |
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Air Cleaner |
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and/or Humidifier |
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| Humidifier Tap |
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Figure 27. Blower Speed Tap Location
Furnace | Cabinet | Nominal | Maximum | Minimum | Maximum | Minimum | Maximum |
Input | Width | Electrical | Operating | Operating | Furnace | Wire | Fuse or Circuit |
(Btuh) | (in.) | Supply | Voltage | Voltage | Amperes | Gauge | Breaker Amps* |
60,000 | 19.75 |
| 127 | 103 |
| 9.7 | 14 | 15 | |
80,000 | 19.75 |
| 127 | 103 |
| 9.7 | 14 | 15 | |
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| Recommended Thermostat Wire Length | ||||||
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*
Table 10. Electrical Data
Field Supplied | Field Supplied | ||
Fused Service | |||
Panel Connector | |||
Panel | |||
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Black (Hot) | Black | Black | |
White (Neutral) | White | White | |
Green or Bare |
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(Ground) |
| Ground | |
Ground |
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Field Supplied Disconnect
Within Sight of Furnace
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| Field Line Voltage |
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Junction Box (may be internal
or external to the furnace). These connections can be made in the field supplied disconnect at the furnace.
Figure 26. Line Voltage Field Wiring
25
