York AVV25B Installation Manual Download

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5292157-UIM-B-0317

Johnson Controls Unitary Products

SECTION VIII: ELECTRIC HEATER

INSTALLATION

If the air handler requires electric heat, install the electric heat kit
according to the installation instructions included with the kit. After
installing the kit, mark the air handler nameplate to designate the heater
kit that was installed. If no heater is installed, mark the name plate
appropriately to indicate that no heat kit is installed.
Use only 6HK Revision C or later heater kits, as listed on air handler
name plate and in these instructions. Use data from Tables 7 through
13 for information on required minimum motor speed tap to be used for
heating operation and maximum over-current protection device
required as listed for combination of air handler and heater kit.

For Upflow, Downflow and Horizontal left-hand applications, the kits can
be installed without modification.

Field modification is required for Horizontal right-hand airflow applica-
tion only. Follow instructions with heater for modification.

SECTION IX: LINE POWER CONNECTIONS

Power may be brought into the unit through the supply air end of the
unit (top left when unit is vertical) or the left side panel. Use the hole
appropriate to the unit’s orientation in each installation to bring conduit
from the disconnect. The power lead conduit should be terminated at
the electrical control box. To determine proper wire sizing, refer to
Tables 6 through 13 and the latest edition of the National Electric Code
or in Canada the Canadian electrical Code and local codes to
determine correct wire sizing. To minimize air leakage, seal the wiring
entry point at the outside of the unit.
All electrical connections to air handlers must be made with copper
conductors.

Direct connection of aluminum wiring to air handlers is

not approved.

If aluminum conductors are present, all applicable local and national
codes must be followed when converting from aluminum to copper
conductors prior to connection to the air handler.
If wire other than uncoated (non-plated), 75°

C ambient, copper wire is

used, consult applicable tables of the National Electric Code (ANSI/
NFPA 70). The chosen conductor and connections all must meet or
exceed the amperage rating of the overcurrent protector (service
disconnect or fuse) in the circuit.

Additionally, existing aluminum wire within the structure must be sized
correctly for the application according to National Electric Code and
local codes. Caution must be used when sizing aluminum rather than
copper conductors, as aluminum conductors are rated for less current
than copper conductors of the same size.

NOTICE

In some horizontal applications, the service disconnects on the elec-
tric heat kits must be rotated 180° so the up position of the discon-
nect is the ON position. This service disconnect orientation change is
required by UL1995, Article 26.19 (in reference to all circuit break-
ers).

CAUTION

This is a fully communicating system. “L1” and “L2” connections
MUST be the same in both indoor and outdoor equipment. Verify “L1”
and “L2” connection locations in the electrical panel that feed the
indoor and outdoor equipment. Failure to wire correctly may introduce
noise onto the RS485 communicating system and cause communica-
tion errors.

FIGURE 11:

Line Power Connections

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