Installation Instructions
Models 8741, 8742 and 8743
Air Duct Monitoring Housings
INTRODUCTION
TECHNICAL DATA
P/N 315-049708FA-4
Models 8741, 8742 and 8743 are air duct monitoring hous-
ings containing sampling tubes. When used with a compat-
ible smoke detector, smoke and combustion products are
detected for shutdown of the duct system and/or operation
of supplementary equipment as provided by the system
control panel. See the following chart for usage.
M
o
d
l e
C
o
m
8
7
4
1
8
8
5
4
8
7
4
2
8
8
5
4
8
7
4
3
8
7
1
0
F F F F F or or or or or compat
compat
compat
compatible control equipment,
ible control equipment,
ible control equipment,
ible control equipment, see c
compat
ible control equipment,
1 1 1 1 1 2 of this manual.
2 of this manual.
2 of this manual.
2 of this manual.
2 of this manual.
AIR DUCT CONDITIONS
Temperature Range:
32
F (0
C) - 100
O
O
O
Altitude Range:
8741, 8742 and 8743 — No altitude limitations
Relative Humidity Range:
10-85% (non-condensing/non-freezing)
Air Duct Velocity Range:
100-4000 ft/min – 8741, 8742 and 8743
Sampling Tube Pressure Range of Differences:
Greater than 0.01 and less than 1.2 inches of water column
These air duct detectors are designed for detection and
control of products of combustion in a duct system. They
are not to be used for open area prot
are not to be used for
are not to be used for
are not to be used for
are not to be used for
DO NOT USE air duct detectors with Alarm Verification.
p
t a
b i
e l
D
e
e t
c
o t
s r
8
7
1
0
8
7
1
3
,
,
8
7
1
3
,
F (38
C) per UL 268/268A
O
open area prot
open area protect
open area prot
open area prot
see c
see char
see c
har
har
harts on the page
ts on the page
ts on the page
ts on the page
see c
har
ts on the page
ect
ection.
ect
ion.
ion.
ion.
ect
ion.
R
e
a l
y
N
o
Y
e
s
Y
e
s
They
They
They
They
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