Subject to change without notice. Published in U.S.A.
6052931-UAI-A-0121
Copyright © 2021 by Johnson Controls. All rights reserved.
Supersedes: 5181703-UAI-C-0818
York International Corp.
5005 York Drive
Norman, OK 73069
Electric heat kits and operating controls
Low-voltage control connections
T
he low-voltage transformer is standard on all models.
The 24-V power supply is provided by an internally wired low-
voltage transformer, which is standard on all air handler and
residential packaged unit models. Field supplied low-voltage
wiring can exit the unit on the top-right corner of the air handler
or the right-side panel of the air handler. See Figure 3 or Figure
4. Residential packaged unit models have provisions for low-
voltage wiring exits in the bottom or right side of the unit. See
Figure 5. Remove the required knockout and pierce the foil
faced insulation to allow the wiring to pass through. Use as
small a hole as possible to minimize air leakage. Install a 7/8-in.
plastic bushing in the selected hole and keep low-voltage wiring
as short as possible inside the control box. To further minimize
air leakage, seal the wiring entry point at the outside of the unit.
Connect the field wiring at the screw terminals of the control
board or on low-voltage wiring leads using twist-on wire con-
nectors.
NOTICE
For blower speed connections, electrical information and wir-
ing diagrams, see indoor unit installation instructions.
NOTICE
The electric heat kits have both auto resettable and fusible
link thermal limit controls.
If failure occurs, this fusible link thermal limit control must be
replaced with a direct replacement.
NOTICE
All wiring must comply with local and national electrical code
requirements. Read and heed all unit caution labels.
