INSTALLATION INSTRUCTIONS
Rough-in Wiring
1. Run branch circuit of proper voltage and wire size to location
of left or right junction box as indicated on heater wiring dia-
gram. Basic heaters are prewired and can be connected to
branch circuit at either end. Heaters with controls are
prewired for connection to branch circuit at one end only
(refer to heater wiring diagram), however, heater can be
wired from opposite end by running wire through heater wire-
way.
2. If it is necessary to run wires through the heater wireway,
use Table B to size the field installed wiring.
3. The factory installed wires in the heater wireway can be
loaded up to 45 amps. Refer to Table C for maximum length
of heater run when the heaters are connected in parallel.
Thermostat
24 amps @ 120-240 VAC
22 amps @ 277 VAC
Pilot duty– 125 VAC (all voltages)
Transformer relay
05A units:
22 amps @ 120-240 VAC
19 amps @ 277 VAC
07A-14A Units:
25 AMPS @ 120-240 VAC
22 AMPS @ 277 VAC
Power relay
25 amps @ 120-277 VAC- see wiring dia-
gram on heater
Disconnect switch
20 amps @ 120-277 VAC
TO REDUCE THE RISK OF FIRE AND ELECTRIC SHOCK
OR INJURY TO PERSONS, OBSERVE THE FOLLOWING:
1.
Before installing this heater, remove and discard shipping
pads located within heater. Check to make sure heater is
not damaged.
2.
Serious injury or death could result from electric shock.
Make sure electrical power supply circuit coming to heater
is disconnected at main disconnect or service panel
before installing this heater.
3.
Wiring procedures and connections must be in accor-
dance with the National Electrical Code (NEC) and local
codes. Refer to Wiring Diagram on heater and Figure 9.
Make sure all electrical connections are tight to prevent
possible overheating. Use Copper Supply Wire Only.
4.
Verify the electrical power supply voltage matches the
voltage rating as printed on the heater nameplate.
CAUTION - Never connect a heater to a voltage greater than
the nameplate voltage as this will damage the heater and
could cause a fire.
5.
Do not install the heater against combustible low-density
cellulose fiberboard surfaces, against or below vinyl wall
coverings, or below any materials that may be damaged
by heat such as vinyl or plastic blinds, curtains, etc. If
heater is intended to be installed against vinyl wall cover-
ings, Stand Off Kits, Cat. No. SO1 or SO2, must be used.
See instructions supplied with kits.
6.
Do not install heater below an electrical convenience
receptacle (outlet).
CAUTION – Heater operates at high temperatures. Keep elec-
trical cords (including telephone and computer cables),
drapes, and other furnishings away from heater. For efficient
and safe operation, we recommend maintaining a minimum of
6 inches (152 mm) clearance above and in front of the heater
at all times.
7.
To reduce the risk of fire, do not store or use gasoline or
other flammable vapors or liquids in the vicinity of the
heater.
8.
Do not install heater upside down or in any position other
than as shown in this manual. Caution label with word
“TOP” must be at the top when heater is installed.
9.
Do not recess heater in wall or install heater inside any
type enclosure as this will cause heater to overheat and
could create a hazard.
10. When mounting heater, use care to secure heater to
building structure and avoid damaging internal heater
components.
11. Do not remove or bypass the safety limit control (thermal
protector) as this could allow heater to become a fire haz-
ard – see heater wiring diagram supplied with heater.
12. The factory installed wires inside wireway are used to
connect the built-in controls. Limit the maximum current
to no more than 45 total amps. Refer to instructions and
current capacity rating as provided with the accessory.
13. Heaters that are not installed end to end must have end
caps installed to cover exposed ends of heater.
14. All field wiring brought in to heater must be rated mini-
mum 75°C.
15 Do not allow objects to be placed on top of heater as they
may be damaged or create a fire hazard.
16. Before energizing, make sure that heater is completely
assembled with grille, front cover, end caps and any
accessories installed.
3
Maximum allowable current
Copper
Maximum no.
wire size
of wires
Up to 3
4 to 6
7 thru 9
75º C
in wireway
Conductors
Conductors
Conductors
No. 12 AWG
9
11.5 amps
9.3 amps
8.1 amps
No. 10 AWG
8
17.4 amps
14.0 amps
12.1 amps
No. 8 AWG
4
24.0 amps
21.0 amps
–
Table B. Sizing Field Installed Wiring
Watts/Ft. of
Maximum allowable length of heater run (feet)
the heaters
120 Volts
208 Volts
240 Volts
277 Volts
125
33
58
67
77
188
22
38
44
51
250
16
29
33
38
Table C. Maximum Length of Heater Run
(CSLAS-1Ø)
Note: For mix of watt densities, calculate amp draw. Do not
exceed values indicated in step 3 above.
125
74
-
86
-
99
188
49
-
57
-
66
250
37
-
43
-
49
376
24
-
28
-
33
500
18
-
21
-
24
564
16
27
19
32
22
625
15
24
17
29
20
750
12
20
14
24
16
Max. allowable length of heater run in feet (meters)
208V
240V
277V
1 Ph
3 Ph
1 Ph
3 Ph
1 Ph
Watts/Ft.
of Heaters
Table D. Maximum Length of Heater Run
(CSLAM and CSLAL)
