Product Overview

Effective: March 2020
4 F-12-0-001
HORIZONTAL AND VERTICAL DETECT-A-FIRE
DETECT-A-FIRE MOUNTING
D-A-F detectors are not position sensitive. Horizontal and vertical detectors refer to the most common mounting configuration for that
detector. However each type can be mounted either horizontally or vertically depending on the application and installation requirements.
Table 5: D-A-F Response Time Index (RTI) and Spacing
Model
No.
Configuration
Contact
Operation
Temperature
(Set Point)
Response Time
Index (ft-s)
1/2
RTI
Classification
RTI Rated
Spacing
Old Rated
Spacing
27021-0
Horizontal
Flush Mount
Normally Open
(Close on Rise)
140°F (60°C), 160°F (71°C) 110 Quick
(20 X 20) ft
(6 x 6) m
(25 x 25) ft
(8 x 8) m
27021-1
Horizontal
Surface Mount
27021-0
Horizontal
Flush Mount
Normally Open
(Close on Rise)
190°F (88°C), 210°F (99°C),
225°F (107°C), 275°F (135°C),
325°F (163°C)
140 Fast
(25 x 25) ft
(8 x 8) m
(25 x 25) ft
(8 x 8) m
27021-1
Horizontal
Surface Mount
27121-0
Vertical
Brass Head
Normally Open
(Close on Rise)
140°F (60°C), 160°F (71°C),
190°F (88°C), 210°F (99°C),
225°F (107°C), 275°F (135°C),
325°F (163°C), 360°F (182°C),
450°F (232°C), 500°F (260°C),
600°F (316°C), 725°F (385°C)
99 (140°F, 160°F)
148 (190°F, 210°F,
225°F, 275°F, 325°F,
360°F, 450°F, 500°F,
600°F, 725°F)
V-Fast
(30 X 30) ft
(9 x 9) m
(25 x 25) ft
(8 x 8) m
27121-20
Vertical
Stainless Head
28021-5
Vertical Stainless
Coupling Head
Note: Spaces shown are distances between detectors on smooth ceilings, the distances from partitions or walls would be half that shown.
Authority Having Jurisdiction (AHJ) should be consulted before installation.
Table 6: Mounting and Hazardous Location Class
Model Number
(Vertical Only)
Hazardous
Location
Fitting required
for UL & ULC
Listing and FM
Approval
27120-2
27121-20
28020-3
28021-5
Class I, Groups
A, B, C and D;
Class II, Groups
E, F and G
Mount detector to a
suitable listed fitting
in accordance with
National Electric
Code and/or local
authority having
jurisdiction.
27120-0
27121-0
Class I, Groups
B, C and D;
Class II Groups
E, F and G
Table 7: Derating Factor for Ceiling Height
Heat Detector Spacing Reduction Based on Ceiling Height
Ceiling Height Above Up to and Including
Derating
Factor
m ft m ft
0 0 3.05 10 1.00
3.05 10 3.66 12 0.91
3.66 12 4.27 14 0.84
4.27 14 4.88 16 0.77
4.88 16 5.49 18 0.71
5.49 18 6.10 20 0.64
6.10 20 6.71 22 0.58
6.71 22 7.32 24 0.52
7.32 24 7.93 26 0.46
7.93 26 8.54 28 0.40
8.54 28 9.14 20 0.34
This table outlines the derating factor required depending on ceiling height
based on NFPA 72 guidelines for D-A-F detector installation.
CONSTRUCTION
• Stainless steel shell sensing element. Cold rolled steel mounting facility. Off-White finish.
• #18 AWG Teflon™ insulated wire is used on detectors exposed to temperatures up to 375°F.
• #16 AWG TGGT insulated wire is used on detectors exposed to temperatures above 375°F.
MODIFICATIONS
• Add ULC Label to any temperature setting.
• Add fluorocarbon coating for better corrosion resistance on select models and temperatures.
(Models 27120-22, 27121-20, 28020- 3, 28021-5. Maximum temperature is 500°F.)
• Add extended leadwires on select models and temperatures.