Chromalox PF451-3 specifications Maintenance, Wiring Diagrams

MAINTENANCE

WARNING: Hazard of Shock. Disconnect all power to heater before servicing or replacing heaters. Do not attempt to service heater while unit is operat- ing as there is hazard of electric shock, injury from operating fan, and burns from hot heating elements.

1.Before activating for next heating season, vacuum or use com- pressed air to remove accumulated dust or lint, which other- wise may restrict proper air flow.

2.Periodically check all electrical connections and retighten to avoid electrical wiring difficulties.

WIRING DIAGRAMS

480V Motor Hook-Up

Elements

7

10

6

9

7

10

6

8

8

Elements

10

6

8

4 5

11

5

M

M

7

11

4 5

11

208 - 240V Motor Hook-Up

M

9

208 - 240V Motor Hook-Up

4

1

1

2

3

9

3

1

3

2

To Fuses

2

KTK-4

KTK-4

Cutout

Cutout

Transformer Color Code Index

T1 T2

T3

T1

T2

T3

PRI XFMR

120V SEC.

24V SEC.

Contactor

Contactor

C1

C1

L2 L3

VOLT

LEAD CLRS

LEAD CLRS LEAD CLRS

L1 L2 L3

L1

X1

X2

H1

H2

X1

X2

X1

X2

XFMR

208

BLK

RED

BLK

WHT

YEL

BLU

L1 L2

L3 TB1

XFMR

Fusing

240

BLK

ORG

BLK

WHT

YEL

BLU

Optional

277

BLK

BRN

BLK

WHT

YEL

BLU

3ø

H1

H2

L1 L2

L3 TB1

480

BLK

BLK/RED

BLK

WHT

YEL

BLU

TB2

C1 C2

Thermostat

Power

60 HZ

(By Others)

3ø

TB2

C1 C2

Thermostat

Fused Switch

Power

Control Power

(By Others)

(By Others)

60 HZ

(By Others)

Fused Switch

Customer Wiring

Customer Wiring

(By Others)

Factory Wire

Factory Wire

Figure 3

Elements		7	10
		6	8
4	5	M	11
			208 - 240V Motor Hook-Up
1			9
			3
			2
			KTK-4

Cutout

Figure 4

Transformer Color Code Index

208 - 240V

PRI XFMR

120V SEC.

24V SEC. 480V Motor Hook-Up

Motor Hook-Up

7

10

VOLT

LEAD CLRS

LEAD CLRS LEAD CLRS

6

9

Elements

8

6

8

H1

H2

X1

X2

X1

X2

5

10

4 5

11

208

BLK

RED

BLK

WHT

YEL

BLU

M

240

BLK

ORG

BLK

WHT

YEL

BLU

7

11

M

4

9

277

BLK

BLK

WHT

YEL

BRN

BLU 1

2

3

1

3

480

BLK

BLK/RED

BLK

WHT

YEL

BLU

To Fuses

2

KTK-4

Customer Wiring

Factory Wire

TB2

C1 C2

Thermostat (By Others)

T1	T2	T3
C1	L2 L3		Contactor
L1
L1 L2			L3 TB1

3ø Power 60 HZ

Fused Switch

(By Others)

		Cutout					Contactor
Thermostat	XFMR			T1	T2 T3		T1 T2 T3
	X1	X2		C1			C3
(By Others)								L3
				L1 L2		L3	L1 L2
Heat	H1	H2
Fan	C4 TB2 TB2	C1 C2	XFMR	L1 L2 L3 TB1
2 PDT			Fusing				3ø
			Optional
Switch							Power
(By Others)	Optional Heat						60 HZ
				Fused Switch
	Recovery switch

Customer Wiring Factory Wire

(By Others) (By Others)

Figure 5

			Elements				7		10
							6		8
							4 5	M	11
									208 - 240V
									Motor Hook-Up
							1		9
								2	3
	Thermostat
									KTK-4
	(By Others)
			T1	T2 T3		Contactor	T1 T2 T3
		C1					C3		Contactor
			L1 L2		L3		L1 L2		L3
	Heat	Cutout
	Fan	C2 C1 TB2	L1 L2 L3 TB1
	C4
2 PDT
Switch							3ø
(By	Others)						Power
							60 HZ
		Optional Heat				Fused Switch
		Recovery switch				(By Others)
		(By Others)							Customer Wiring
									Factory Wire

Figure 6

Note: All fan motors are totally enclosed and internally thermal overload protected.

MOTOR LUBRICATION

Motors in VUH-C-15 through VUH-C-25 have sleeve bearings which are factory lubricated.

Figure 7