Wiring Diagrams - Chromalox PF451-3 Installation, Operation And Renewal Parts Identification

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.
480V Motor Hook-Up
6 9
8
Elements
5 10
M
7 11
4
1 3
2
To Fuses
Cutout
T1 T2 T3
Contactor
C1
L2 L3
L1
X1 X2
XFMR
Fusing
XFMR
Optional
H1 H2
L1
Thermostat
TB2 C1 C2
(By Others)
Elements
Cutout
T1 T2 T3
C1
L2 L3
L1
L1 L2
TB2 C1 C2 Thermostat
(By Others)
Thermostat
(By Others)
Heat
Cutout
Fan
TB2
C4 C2 C1
2 PDT
Switch
(By Others)
Optional Heat
Recovery switch
(By Others)
MAINTENANCE

WIRING DIAGRAMS

7 10
6 8
11
4
5
M
208 - 240V Motor Hook-Up
9
1 3
2
KTK-4
Transformer Color Code Index
PRI XFMR 120V SEC.
VOLT LEAD CLRS LEAD CLRS
H1 H2 X1 X2
208 BLK RED BLK WHT
240 BLK ORG BLK WHT
277 BLK BRN BLK WHT
480
BLK BLK/RED BLK WHT
TB1
L2 L3
3ø
Power
60 HZ
Fused Switch
Customer Wiring
(By Others)
Factory Wire
Figure 3
7 10
6
8
11
4
5
M
208 - 240V Motor Hook-Up
9
1 3
2
KTK-4
Contactor
L3
TB1
3ø
Power
60 HZ
Fused Switch
(By Others)
Customer Wiring
Factory Wire
Figure 5
7 10
Elements
6
8
11
4
5
M
208 - 240V
Motor Hook-Up
9
1
3
2
KTK-4
T1 T2 T3
T1 T2 T3
Contactor
Contactor
C1
C3
L1 L2 L3
L1 L3
L2
TB1
L1 L2 L3
3ø
Power
60 HZ
Fused Switch
(By Others)
Customer Wiring
Factory Wire
Figure 7
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.
24V SEC.
LEAD CLRS
X1 X2
YEL BLU
YEL BLU
YEL BLU
YEL BLU
TB2 C1 C2 Thermostat
(By Others)
Transformer Color Code Index
PRI XFMR
VOLT LEAD CLRS LEAD CLRS
H1 H2
208 BLK RED
240 BLK ORG
277 BLK BRN
480 BLK BLK/RED
Customer Wiring
Factory Wire
Thermostat
(By Others)
2 PDT
Switch
(By Others)
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.
7 10
Elements
6
8
11
4
5
M
1
2
KTK-4
Cutout
T1 T2 T3
Contactor
C1
L2 L3
L1
L1 L2 L3
TB1
3ø
Power
60 HZ
Fused Switch
(By Others)
Control Power
(By Others)
Figure 4
120V SEC. 24V SEC.
480V Motor Hook-Up
LEAD CLRS
Elements
6
9
8
X1 X2 X1 X2
5 10
BLK WHT YEL BLU M
7
11
BLK WHT YEL BLU
4
BLK WHT YEL BLU 1
3
2
BLK WHT YEL BLU To Fuses
Cutout
XFMR T1 T2 T3
C1
X1 X2
L1
H1 H2
Heat
Fan
XFMR
TB2 TB2 C1 C2
C4
Fusing
Optional
Optional Heat
Recovery switch Fused Switch
(By Others) (By Others)
Figure 6
208 - 240V Motor Hook-Up
9
3
Customer Wiring
Factory Wire
208 - 240V
Motor Hook-Up
7 10
6 8
11
4
5
M
9
1
3
2
KTK-4
Contactor
T1 T2 T3
C3
L2 L3 L1 L3
L2
TB1
L1 L2 L3
3ø
Power
60 HZ