ACCESSORY KIT INSTALLATION MANUAL
ELECTRIC HEATER ACCESSORY - 6HK SERIES
FOR USE WITH THE FOLLOWING AIR HANDLER
MODELS: AHR / AHE
This instruction covers the physical installation of the following
electric heaters with AHR/AHE18-60 single piece air handlers.
Refer to unit instructions for electrical specifications.
GENERAL INFORMATION
These electric heat accessories are used for applications of
cooling with electric heat and heat pump with electric heat.
Each of the air handler unit models are approved for use with
specific electric heat accessories. The Air Handler installation
instructions, or name plate list the possible combinations and
other important electrical data and limitations.
ELECTRICAL SHOCK HAZARD
Installation or repairs made by unqualified persons can result
in hazards to you and others. Installation must conform with
local building codes or, in the absence of local codes, with
National Electrical Code ANSI/NFPA 70-1996 or current edi-
tion.
The information contained in this manual is intended for use
by a qualified service technician familiar with safety proce-
dures and equipped with the proper tools and test instru-
ments.
Shut OFF electric power at unit disconnect and/or service
panel before beginning the following procedures.
Failure to carefully read and follow all instructions in this man-
ual can result in malfunction, property damage, personal
injury, and/or death.
TABLE 1: Models Covered*
6HK06500206
6HK16502506
6HK16500206
6HK06501525
6HK06500506
6HK06501825
6HK16500506
6HK16501825
6HK06500806
6HK16502025
6HK16500806
6HK16502525
6HK06501006
6HK26501306
6HK16501006
6HK26501506
6HK16501306
6HK26501806
6HK16501506
6HK26502006
6HK16501806
6HK26502506
6HK16502006
Verify edges of foil faced insulation are not in contact with any
exposed electrical connections.
* Refer to Page 4 for nomenclature.
3.
REMOVE
DUCT COVER
4. SLIDE HEATER KIT INTO
AIR HANDLER AND ATTACH
WITH 4 DUCT COVER SCREWS
5.
FIELD SUPPLY WIRING
THIS SIDE
1.
IF HEAT KIT TO BE INSTALLED
HAS CIRCUIT BREAKERS,
REMOVE CIRCUIT BREAKER
KNOCKOUTS.
BLOWER
ACCESS PANEL
2.
FIGURE 1: Heater Installation
Johnson Controls Unitary Products
669997-UAI-D-1111
669997-UAI-D-1111
LOW VOLTAGE CONTROL CONNECTIONS
The 24 volt power supply is provided by an internally wired low
voltage transformer which is standard on all air handler models.
Field supplied low voltage wiring can exit the unit on the top
right hand corner or the right hand side panel. Refer to Figure 1.
Remove desired knockout and pierce foil faced insulation to
allow wiring to pass through. Use as small of a hole as possible
to minimize air leakage. Install a 7/8” 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. The field wiring is to
be connected at the screw terminals of the control board.
NOTICE
All wiring must comply with local and national electrical code
requirements. Read and heed all unit caution labels.
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 18 KW)
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
TYPICAL WIRING WITHOUT ELECTRIC HEAT
GND.
LUG
GND. LUG
GND.
LUG
GND. LUG
(2.5 - 25 KW) - 25 KW SHOWN
POWER
SUPPLY
GND. LUG
GND.
LUG
POWER
SUPPLY
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
& BREAKER BAR REMOVED
TERMINAL
BLOCK
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
GND. LUG
POWER
SUPPLY
GND.
LUG
GND.
LUG
GND. LUG
(JUMPER BAR)
POWER
SUPPLY 1
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
POWER
SUPPLY 2
POWER
SUPPLY
POWER
SUPPLY 3
POWER WIRING (208/230-1-60)
TERMINAL
BLOCK
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
CONNECT TRANSFORMER LEADS WITH
WIRE NUTS (TYPICAL ALL HEAT KITS)
FIGURE 3: Line Power Connections for PSC Motors
TYPICAL WIRING WITHOUT ELECTRIC HEAT
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
3 PHASE (10 - 18 KW)
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
AS SHIPPED FROM FACTORY
SINGLE SOURCE
GND.
LUG
GND. LUG
(2.5 - 25 KW) - 25 KW SHOWN
GND.
LUG
GND. LUG
POWER
SUPPLY
GND. LUG
GND.
LUG
POWER
SUPPLY
1 PHASE ELECTRIC HEAT
WITH CIRCUIT BREAKER
TERMINAL
BLOCK
& BREAKER BAR REMOVED
MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
POWER
SUPPLY
GND. LUG
GND.
LUG
(JUMPER BAR)
GND.
LUG
GND. LUG
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
POWER
SUPPLY 1
POWER
SUPPLY 2
POWER
SUPPLY 3
POWER
SUPPLY
TERMINAL
BLOCK
POWER WIRING (208/230-1-60)
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS
FIGURE 4: Line Power Connections for Standard ECM Motors
Johnson Controls Unitary Products
3
NOTICE
For blower speed connections, electrical information and wir-
ing diagrams, see indoor unit installation instructions.
NOTICE
The electric heaters have both auto resettable and one shot
thermal limit controls. If failure occurs, this one shot thermal
limit control must be replaced with a direct replacement.
UPFLOW
HEAT
HORIZONTAL RIGHT
HORIZONTAL LEFT
FIGURE 5: Typical Installed Application
NOMENCLATURE - ELECTRICAL
2 = Electrical Accessory
6 = 3rd Gen. Electrical Accessory
HK = Heater Kit
4 = 2nd Gen Electrical Accessory
Product Cate-
gory
6
HK
Family Identifier
06 = Residential Air Handlers for Heat Pump & Air Conditioner
16 = Electric Heater W / Breaker
06
5
Where Used
26 = With Circuit Breaker and breaker jumper
5 = Electric Heat
005 = 5 KW
7 = General
Class Identifier
008 = 8 KW
010 = 10 KW
013 = 13 KW
018 = 18 KW
025 = 25 KW
25 = 208/230-3-60
46 = 460-3-60
Electric Heat, in
KW
005
015 = 15 KW
020 = 20 KW
06 = 208 / 230-1-60
24 = 240-1-60
06
Voltage Code
Order Code
BK = Bulk Pack (If Applicable)
BK
Subject to change without notice. Published in U.S.A.
669997-UAI-D-1111
Copyright © 2011 by Johnson Controls, Inc. All rights reserved.
Supersedes: 669997-UAI-C-0611
Johnson Controls Unitary Products
5005 York Drive
Norman, OK 73069
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