7
Wiring and Wiring Diagrams
ELECTRIC SHOCK HAZARD. Disconnect all power
before installing or servicing heater. Failure to do so
could result in personal injury or property damage.
Heater must be installed by a qualified person in ac-
cordance with the National Electrical Code, NFPA 70.
ELECTRIC SHOCK HAZARD. Any installation involv-
ing electric heaters must be performed by a quali-
fied person and must be effectively grounded in
accordance with the National Electrical Code to
eliminate shock hazard.
1. Loosen and remove bolts securing the main terminal
enclosure cover on side of unit. Connect heater to line
supply wires at the box lugs located on the contactor
according the voltage and frequency specified on the
nameplate (see Figure 9). Refer to the appropriate wiring
diagram which also appears on the inside cover of this
enclosure (see Table B and diagrams on page 6).
EXPLOSION HAZARD. Cover joints must be clean be-
fore replacing cover. Do not use any gasket material
on joint surfaces.
2. Use copper conductors only for supply wires. Refer to
nameplate and Table B for size and rating required.
3. Connect supply line ground conductor to the box lug
provided on the base plate below contactor input lugs.
4. The fan motor is factory wired at the same voltage, and
phase as the heating elements. All motors are thermally
protected and connected to the main supply contactor.
On three phase units,
it is necessary to verify that the
fan rotation is correct. Air stream discharge must be out
front of unit. After connecting unit to line and closing all
covers tightly, energize unit momentarily. If air does not
exit front louvers, reverse any two supply leads at the box
lugs on the contactor or at the supply disconnect.
5. Either of two 1 NPT rigid conduit openings with integral
stops may be used for connection to supply line. (See
Figure 9 and 10 for locations) Use only NEC approval
hazardous locations means of wiring such as mineral in-
sulated cable and fittings or rigid conduit and seal fittings
located as required by installation codes.
EXPLOSION HAZARD. All unused conduit openings
must be fitted with plugs that are U.L. recognized
for use in hazardous locations.
6. Heaters may be provided with a built-in control switch
and/or thermostat. If not, they should be controlled by an
externally mounted disconnect switch and/or separately
mounted thermostat as shown in the appropriate wiring
diagram on page 6. In case of malfunction, the personnel
in the area should be aware of location of heater discon-
nect.
Table B -Supply Wiring Requirements
Model
kW Ph Volts
Supply
Wire 90˚C
Size (ga)
Full
Load
Amps.
Max
Fuse
Amps.
Wiring
Dia.
CXH-C-03S
3
1
208
10
16.9
25
I
CXH-C-03S
3
3
208
12
9.7
15
II
CXH-C-03S
3
1
240
10
14.6
20
I
CXH-C-03S
3
3
240
12
8.4
15
II
CXH-C-03S
3
3
380
12
5.3
15
II
CXH-C-03S
3
3
415
12
4.9
15
II
CXH-C-03S
3
3
480
12
4.2
15
II
CXH-C-03S
3
3
575
12
3.5
15
II
CXH-C-05S
5
1
208
8
27.4
35
I
CXH-C-05S
5
3
208
10
15.9
20
II
CXH-C-05S
5
1
240
8
23.8
30
I
CXH-C-05S
5
3
240
10
13.7
20
II
CXH-C-05S
5
3
380
12
8.7
15
II
CXH-C-05S
5
3
415
12
7.9
15
II
CXH-C-05S
5
3
480
12
6.9
15
II
CXH-C-05S
5
3
575
12
5.7
15
II
CXH-C-07S
7.5
1
208
4
40.6
50
I
CXH-C-07S
7.5
3
208
8
23.5
30
II
CXH-C-07S
7.5
1
240
6
35.2
45
I
CXH-C-07S
7.5
3
240
10
20.4
25
II
CXH-C-07S
7.5
3
380
10
12.9
20
II
CXH-C-07S
7.5
3
415
12
11.8
15
II
CXH-C-07S
7.5
3
480
12
10.2
15
II
CXH-C-07S
7.5
3
575
12
8.5
15
II
CXH-C-10S
10
3
208
6
31.1
40
II
CXH-C-10S
10
1
240
4
46.7
60
I
CXH-C-10S
10
3
240
8
27.0
35
II
CXH-C-10M
10
3
380
10
17.0
25
II
CXH-C-10M
10
3
415
10
15.6
20
II
CXH-C-10S
10
3
480
10
13.5
20
II
CXH-C-10S
10
3
575
12
11.3
15
II
CXH-C-15M
15
3
208
4
46.4
60
II
CXH-C-15M
15
3
240
4
40.2
50
II
CXH-C-15M
15
3
380
8
25.4
35
II
CXH-C-15M
15
3
415
8
23.3
30
II
CXH-C-15M
15
3
480
10
20.1
25
II
CXH-C-15M
15
3
575
10
16.8
20
II
CXH-C-20M
20
3
380
6
33.8
40
II
CXH-C-20M
20
3
415
8
30.9
40
II
CXH-C-20M
20
3
480
8
26.7
35
II
CXH-C-20M
20
3
575
8
22.3
30
II
CXH-C-25L
25
3
380
6
42.1
50
II
CXH-C-25L
25
3
415
6
38.6
50
II
CXH-C-25L
25
3
480
6
33.4
40
II
CXH-C-25L
25
3
575
8
27.9
35
II
CXH-C-30L
30
3
380
4
50.5
60
II
CXH-C-30L
30
3
415
4
46.2
60
II
CXH-C-30L
30
3
480
4
40.0
50
II
CXH-C-30L
30
3
575
6
33.4
40
II
CXH-C-35L
35
3
480
4
46.6
60
II
CXH-C-35L
35
3
575
6
38.9
50
II
CXH-D-05
5
3
690
12
4.8
10
II
CXH-D-30
30
3
690
10
27.8
35
II
