Installation, Operation
4
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PF494-1
MAINTENANCE
161-506173-001
JULY, 2002
CAF-20 Series Architectural Cabinet
Convection Heater
TABLE 1 — Specifications
Model
Volts
Phase
Watts
Amps
BTUH
Length
Weight (Lbs.)
CAF-20215
CAF-20215
CAF-20215
CAF-20215
CAF-20215
CAF-20215
CAF-20215
CAF-20220
CAF-20220
CAF-20220
CAF-20220
CAF-20220
CAF-20220
CAF-20220
CAF-20330
CAF-20330
CAF-20330
CAF-20330
CAF-20330
CAF-20330
CAF-20330
CAF-20430
CAF-20430
CAF-20430
CAF-20430
CAF-20430
CAF-20430
CAF-20430
CAF-20440
CAF-20440
CAF-20440
CAF-20440
CAF-20440
CAF-20440
CAF-20440
CAF-20645
CAF-20645
CAF-20645
CAF-20645
CAF-20645
CAF-20645
CAF-20645
CAF-20550
CAF-20550
CAF-20550
CAF-20550
CAF-20550
CAF-20550
CAF-20550
CAF-20660
CAF-20660
CAF-20660
CAF-20660
CAF-20660
CAF-20660
CAF-20660
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
208
208
240
240
277
480
480
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1
3
1
3
1
1
3
1,500
1,500
1,500
1,500
1,500
1,500
1,500
2,000
2,000
2,000
2,000
2,000
2,000
2,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
3,000
4,000
4,000
4,000
4,000
4,000
4,000
4,000
4,500
4,500
4,500
4,500
4,500
4,500
4,500
5,000
5,000
5,000
5,000
5,000
5,000
5,000
6,000
6,000
6,000
6,000
6,000
6,000
6,000
7.2
4.2
6.3
3.6
5.4
3.1
1.8
9.6
5.6
8.3
4.8
7.2
4.2
2.4
14.4
8.3
12.5
7.2
10.8
6.3
5,118
5,118
5,118
5,118
5,118
5,118
5,118
6,824
6,824
6,824
6,824
6,824
6,824
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
24.3
36.3
36.3
36.3
36.3
36.3
36.3
36.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
48.3
72.3
72.3
72.3
72.3
72.3
72.3
72.3
60.3
60.3
60.3
60.3
60.3
60.3
60.3
72.3
72.3
72.3
72.3
72.3
72.3
72.3
32
32
32
32
32
32
32
32
32
32
32
32
32
Length
6,824
32
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
10,236
13,648
13,648
13,648
13,648
13,648
13,648
13,648
15,354
15,354
15,354
15,354
15,354
15,354
15,354
17,060
17,060
17,060
17,060
17,060
17,060
17,060
20,472
20,472
20,472
20,472
20,472
20,472
20,472
43.5
43.5
43.5
43.5
43.5
43.5
43.5
53
53
53
53
53
53
53
53
53
53
53
53
53
53
74
74
74
74
74
74
74
63.5
63.5
63.5
63.5
63.5
63.5
63.5
74
74
74
74
74
Side View
20
(Less End Cap)
1
1-1/2
2
Back View
1
3.6
14.4
8.3
12.5
7.2
10.8
6.3
5-3/4
Terminal Box
2-3/4
Terminal Box
3.6
Bottom View
(Front Inlet Version Shown)
Figure 1
19.2
11.1
16.7
9.6
14.4
8.3
4.8
21.6
12.5
18.8
10.8
16.2
9.4
5.4
24
13.9
20.8
12
18.1
10.4
6
28.8
16.7
25
14.5
21.7
12.5
7.2
74
74
© 2010 Chromalox, Inc.
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INSTALLATION (Recessed Wall)
1. Unpack the heater from the carton and remove the front panel.
TIP: The bottom trim may be omitted if the heater is to be
Note: The front panel screws are recessed at the bottom of the
front panel at each end of the heater.
installed at floor level.
5. Prepare the wall recess opening to accept the heater.
TIP: Leave approximately 1/2” clearance to insert the heater
cabinet.
2. Remove the desired terminal box covers and wire supply
knockouts from the terminal box area.
3. Use trim frame as a template to drill holes into the top, bottom
and sides of the heater using a 1/8” diameter drill bit.
4. Secure the trim frame using the #8 screws provided with the
trim kit.
6. Secure the back plate into the recess opening using suitable
fasteners (Provided by customer).
7. Proceed to the wiring instructions.
WIRING
Note: All wiring should be done in accordance with local codes
and the National Electrical Code by a qualified person.
Terminal Box Volumes (Cubic Inches)
Heater Style
Left Hand Box
4” Wide
Right Hand Box
5” Wide
1. Run branch circuit wiring of proper voltage and wire size to the
location of the terminal box of the heater.
CAF-20
379.75
474.75
4. Do a final and complete check of all wiring then replace the
terminal box covers.
5. The front panel may now be installed.
TIP: Supply wire entry is commonly made into one heater.
Through wiring (factory furnished) can be used for connection
to adjacent heaters.
WARNING: To prevent the risk of fire, do not oper-
ate the heater without the front cover in place.
Recommended minimum supply wire sizes are listed in the table
below:
Insert the top of the front panel into the top flange of the heater.
Push the bottom flange of the front panel into place and secure
with screws.
Maximum Watts Per Circuit Using 75°C. Wire
Rough In
Wire Size
120V
208V
240V 277V
347V 480V
600V
14
12
10
1440
1920
2880
2496
3328
4992
2880 3324
3840 4432
5760 6648
4164 5760
5552 7680
7200
9600
Copper
Wire
8328 11520 14400
2. Wire all heaters and controls in accordance with the appropri-
ate wiring diagram.
TIP: Sample wiring diagrams are provided on page 4.
3. Wrap the supply ground wire to the green painted ground
screw and tighten.
Note: When heaters are mounted end to end, remove the fin-
ishing end plate, install a chase nipple and locknut in the ter-
minal box to insure grounding continuity, and to protect the
wiring. (Figure 4)
Figure 5
Chase Nipples
Installation Between
Heaters Butted Together
Maintenance
The CAF-20 series heaters contain no moving parts. Occasional
vacuum cleaning of the cabinet interior is the only maintenance
required.
WARNING: Before removing the front cover for
cleaning, make certain supply power is discon-
nected.
Ground Wire Running
Through Chase Nipple
Figure 4
Where heaters are spaced apart, remove the finishing plate and use
rigid conduit (provided by customer) for through wiring and
ground continuity. Do not exceed the allowable number of con-
ductors allowed by the National Electrical Code.
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WIRING DIAGRAMS
Heater LYD Relay – 1-Ph Parallel
Element
Heater No Controls – 1-Ph Parallel
Element
Unit
Control
T2
T1
Unit
Control
L1
L1
L2
2
Return Wire
L2
Return Wire
L1
L2
Heater No Controls – 3-Ph Delta
Heater LVC Relay – 1-Ph Parallel
Element
Element
L1
L2
L1
Unit
Control
Unit
Control
T0
T1
L2
2
Return Wire
L1
L2
Return Wires
L3
L3
Heater 3 Pole Contactor – 3-Ph Delta
Element
T0
T1
Heater 2 Pole Stat – 1-Ph Parallel
Unit
Element
Unit
Control
Control
24V
L1
L2
Stat
L1
L1
L2
L3
L2
Return Wire
Return Wires
Contactor
Heater 3 Pole Stat – 3-Ph Parallel
Heater 3 Pole Contactor/TX – 3-Ph Delta
Element
T0
T1
Element
Unit
Unit
Control
Control
24V
Stat
L1
L2
L3
L1
L2
L3
Return Wires
Return Wires
L1 L2 L3
Contactor
Limited Warranty:
Please refer to the Chromalox limited warranty applicable to this product at
2150 N. RULON WHITE BLVD., OGDEN, UT 84404
Phone: 1-800-368-2493
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