King Electric FCM Floor Mat - Manual (Page 10)

King Electrical Floor Heating Mat Installation Manual 10
f
t
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8
0
Leng
t
h
m
2
4
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4
2
1
5
Heated area spacing
(ft2)
3 4 Watts Amps
20 25 240 1.0
Fast
Set Ohms
Strapping
2 4 0 . 0 2 0 f t .
3.2 Determine the direction of the cable runs. It is recommended that the cable run parallel to the wall that the
thermostat is mounted. 48 inches. Center straps should be 3 to 4 feet apart.
3.3 On average, a 5 to 10% deduction in heated area will create a 2-4” border. To determine the exact distance to mount the mat
from the wall, take the actual room square footage less the selected mat kit less to
determine the unheated border. Then take the unheated border and divide it by the perimeter. Now multiply by 12 for the number
of inches to mount the mat away from the wall.
A. 10ft x 10ft room = 100 ft 2
B. 4ft x 10ft = 40 ft perimeter
C. Mat kit selected 90 ft
D. 100ft - 90 ft = 10ft unheated border
E. 10ft / 40ft = .25ft
F. .25ft x 12in/ft = 3” from the wall
3.4 It is difficult to predict exactly where the heating cable will end, thus it is important to have a buffer zone.
A buffer zone is an area where heating in not essential and if unheated will go unnoticed. This area is also used for any excess
cable where a higher heated density will also be un-noticed.
STEP 3: Thermostat location
3.1 Mark the location of the thermostat on the drawing. This is where the cold lead will drop from the wall box and
become the starting point for the heating cable as well as where the floor sensor will be installed.
End Splice
2
2
Cold Lead
T
Thermostat