Supply Wire Size Recommendations
The table at the right is provided to assist the
licensed electrician in sizing the electric supply
wires required to deliver power to each individual
heater. All branch circuit supply wiring must be
copper, rated 90o C minimum and comply with all
local codes and the NEC.
All recommended wire sizes assume a 50ft.
maximum wire length.
REQUIRED CLEARANCES
DO NOT install heaters closer than 36 inches to a
vertical surface or 24 inches to a ceiling. Heaters
MUST BE SEPARATED by more than 36 inches
and 72 inches from any combustible surface in
direct radiation path (87 inches for FSS-95
Series).
HEATER HANGING ALTERNATIVES
One method of hanging the heaters (shown
below) is with hardware chain and “S” hooks. The
chain and “S” hooks must be either 14 or 16 gauge
for all models. The heaters also can be mounted
“fixed” with angle iron, metal rods or metal straps.
Whatever means is used to mount the heaters,
the terminal box must be EVEN WITH or LOWER
THAN the horizontal plane of the heater housing.
ISSUE DATE 07-2015 REV. DATE ------------ REV. LEVEL: - ECO 1-7090 OIPM P/N 8419 PG 8 OF12
FIRE HAZARD
BURN HAZARD
• Install heaters to comply with
REQUIRED CLEARANCES
listed above at right.
• Do not mount heaters
vertically.
INSTALLATION - HANGING HEATERS
INSTALLATION PLANNING (CON’T.)
Heater Model
kW
Volts
Amps
Recommended
AWG Wire Size
3ph 1ph
3ph 1ph
FSS-1412-1
1.45
120
N/A
12.08
N/A
12
FSS-1420-1
1.45
208
N/A
6.97
N/A
12
FSS-1424-1
1.45
240
N/A
6.04
N/A
12
FSS-1427-1
1.45
277
N/A
5.23
N/A
12
FSS-1448-1
1.45
480
N/A
3.02
N/A
12
FSS-1457-1
1.45
600
N/A
2.52
N/A
12
FSS-3120-1
3.15
208
N/A
15.14
N/A
12
FSS-3124-1
3.15
240
N/A
13.13
N/A
12
FSS-3127-1
3.15
277
N/A
11.37
N/A
12
FSS-3148-1
3.15
480
N/A
6.56
N/A
12
FSS-3157-1
3.15
600
N/A
5.48
N/A
12
FSS-4320-3
4.3
208
11.9
20.67
12
10
FSS-4324-3
4.3
240
10.4
17.9
12
10
FSS-4327-1
4.3
277/480
5.2
15.5
12
12
FSS-4348-3
4.3
480
5.2
9.0
12
12
FSS-4357-3
4.3
600
4.3
7.5
12
12
FSS-9520-3
9.5
208
26.4
45.7
8
8
FSS-9524-3
9.5
240
22.9
39.6
10
8
FSS-9527-1
9.5
277/480
11.4
34.3
12
8
FSS-9548-3
9.5
480
11.4
19.8
12
10
FSS-9557-3
9.5
600
9.5
16.5
12
10
