LOW Voltage Control Connections

669997-UAI-D-1111

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.

TYPICAL WIRING WITHOUT ELECTRIC HEAT

GND. LUG										GND.
										GND.
										LUG

POWER

SUPPLY

1 PHASE ELECTRIC HEAT

WITH CIRCUIT BREAKER

& BREAKER BAR REMOVED

MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN

GND. LUG	GND.
	LUG
POWER
SUPPLY 1
POWER
SUPPLY 2
POWER
SUPPLY 3
MAY BE 1, 2, OR 3
CIRCUIT BREAKERS

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

3 PHASE (10 - 18 KW)

GND. LUG	GND.
	LUG
POWER
SUPPLY	TERMINAL
	TERMINAL
	BLOCK
ELECTRIC HEAT
WITHOUT CIRCUIT BREAKER
SINGLE SOURCE (2.5 - 10 KW)
GND. LUG	GND.
	LUG
POWER
SUPPLY
	TERMINAL
	BLOCK

CONNECT TRANSFORMER LEADS WITH WIRE NUTS (TYPICAL ALL HEAT KITS)

1 PHASE ELECTRIC HEAT WITH CIRCUIT BREAKER AS SHIPPED FROM FACTORY SINGLE SOURCE

(2.5 - 25 KW) - 25 KW SHOWN

GND. LUG									GND.
									LUG
									LUG

POWER

SUPPLY

(JUMPER BAR)

MAY BE 1, 2, OR 3

CIRCUIT BREAKERS

POWER WIRING (208/230-1-60)

FIGURE 3: Line Power Connections for PSC Motors

TYPICAL WIRING WITHOUT ELECTRIC HEAT

GND. LUG

GND.

LUG

POWER

SUPPLY

1 PHASE ELECTRIC HEAT

WITH CIRCUIT BREAKER

& BREAKER BAR REMOVED

MULTI-SOURCE (15 - 25 KW) - 25 KW SHOWN

GND. LUG

GND.

LUG

POWER

SUPPLY 1

POWER

SUPPLY 2

POWER

SUPPLY 3

MAY BE 1, 2, OR 3

CIRCUIT BREAKERS

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

3 PHASE (10 - 18 KW)

GND. LUG	GND.
	LUG
POWER
SUPPLY	TERMINAL
	TERMINAL
	BLOCK
ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

SINGLE SOURCE (2.5 - 10 KW)

GND. LUG	GND.
	LUG
POWER
SUPPLY
	TERMINAL
	BLOCK

1 PHASE ELECTRIC HEAT WITH CIRCUIT BREAKER AS SHIPPED FROM FACTORY SINGLE SOURCE

(2.5 - 25 KW) - 25 KW SHOWN

GND. LUG									GND.
									LUG
									LUG

POWER

SUPPLY

(JUMPER BAR)

MAY BE 1, 2, OR 3

CIRCUIT BREAKERS

POWER WIRING (208/230-1-60)

FIGURE 4: Line Power Connections for Standard ECM Motors

Johnson Controls Unitary Products

AHR, AHE specifications

Johnson Controls is a leader in delivering innovative solutions for the built environment. Among its numerous offerings, the AHR (Air Handling Unit) and AHE (Air Handling Equipment) are exemplary products that showcase the company’s commitment to efficiency, sustainability, and performance.

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