York MA installation manual Section Viii Blower Speed Connections, UIM-A-0806

262675-UIM-A-0806

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 - 15 KW)

GND. LUG	GND.
	LUG

POWER

SUPPLY

TERMINAL BLOCK

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

SINGLE SOURCE (2.5 - 10 KW)

GND. LUG	GND.
	LUG

POWER SUPPLY

TERMINAL BLOCK

CONNECT 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

POWER

SUPPLY

(JUMPER BAR)

MAY BE 1, 2, OR 3

CIRCUIT BREAKERS

POWER WIRING (208/230-1-60)

NOTE: USE ONLY COPPER CONDUCTORS

FIGURE 6: Line Power Connections

3 PHASE ELECTRIC HEAT WITH CIRCUIT BREAKER MULTI-SOURCE - 25 KW

GND. LUG	GND.
	LUG

POWER

SUPPLY 1

POWER

SUPPLY 2

(2)3-PHASE BREAKERS

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

FIGURE 7: 460V - Line Power Connections

SECTION VIII: BLOWER SPEED

CONNECTIONS

All air handlers contain 3-speed blower motors which are prewired to the control board.

Adjust blower motor speed to provide airflow within the minimum and maximum limits approved for evaporator coil, electric heat and outdoor unit. Speed tap adjustments are made at the motor terminal block, See Figure 8 or 9. Airflow data is shown in Tables 19 & 20.

Connect motor wires to motor speed tap receptacle for speed desired. See wiring label for motor wiring details.

ELECTRIC HEAT

WITHOUT CIRCUIT BREAKER

3 PHASE (10 - 15 KW)

GND. LUG	GND.
	LUG

POWER

SUPPLY

TERMINAL

BLOCK

FACTORY WIRED TO			PUR
TRANSFORMER
YEL	CAP
FACTORY WIRED TO		BRN
FAN MOTOR RELAY
TERMINAL ON	HIGH		PUR
CONTROL BOARD
230 VOLT	MED
BLOWER MOTOR	LOW

GND.

FIGURE 8: Blower Speed Connections

ORG TAPE END & CAP

WITH WIRE NUT

ORG

		HIGH	L1
		MED
460 VOLT		LOW			HIGH			ORG
						L1
BLOWER	PUR	BRN			MED
			460 VOLT		LOW
MOTOR
L2			BLOWER	PUR	BRN			HIGH
			MOTOR					MED	L1
		HIGH						LOW
			L2
						460 VOLT	PUR
				MEDIUM				BRN
						BLOWER
						MOTOR
						L2
								LOW

460 VOLT BLOWER MOTOR

FIGURE 9: 460V - Blower Speed Connections

8 Unitary Products Group