Safety Technology International STI Heated Polycarbonate Enclosures Data Sheet
POLYCARBONATE PROTECTION
STI HE ATED
POLYCARBONATE
ENCLOSURES
STI-7520-HTR
STI-7510F-HTR
NEMA 4X
PRODUCT OVERVIEW
These covers are ideal for protecting a wide range of devices, components and sensitive
units from vandalism and accidental damage as well as weather, dirt, dust and grime.
Covers are designed to keep the enclosure at a temperature above freezing which
allows the protected unit to be installed outdoors, in freezers, unheated warehouses or
storage units. The radiant heat plate prevents LCD displays from becoming sluggish or
freezing and operates on 12, 16.5 or 24 VAC/VDC. The STI-7510-HTR/STI-7511-HTR
enclosures include an external thumb or key lock and have a choice of two enclosed
back boxes. STI-7520-HTR has a key lock and STI-7521-HTR has a thumb lock.
HOW THEY WORK
The radiant heat plate cycles as required when activated by one of the thermostats.
It has three thermostats; a control thermostat, over temperature safety thermostat
and a low temperature warning that can connect to a supervisory panel. This allows
electronics to be protected from extreme temperatures.
KEY FEATURES
General Information
· Protection for large units against
physical damage, dust, grime and
severe environments.
· Allows electronic devices to be
installed outdoors, in freezers,
unheated warehouses or storage
units.
· Three year guarantee against
breakage of polycarbonate in
normal use (one year on electro
mechanical and electronic
components).
Design
· The radiant heat plate prevents LCD
displays from becoming sluggish or
freezing.
Installation
· Mounting hardware and gaskets
included.
· Typical working properties of
polycarbonate are -40° to 250°F
(-40° to 121°C).
Electronics
· Enclosure offers three thermostats;
a control thermostat, over
temperature safety thermostat and
a low temperature warning that can
connect to a supervisory panel.
· Includes 16.5VAC, 40VA Class 2
auto resetting transformer.
Options
· Choice of external thumb or key
lock and two enclosed back boxes.
STI Heated Polycarbonate Enclosures
HEAT
ON
POWER
REMOVE
1.88
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
06298 MOUNTING
TAB (4) PROVIDED
19033 #10-12 PLASTIC
ANCHOR (4) PROVIDED
19013 #10 x 1-1/2 in. PAN
HEAD SCREW (4) PROVIDED
ADDITIONAL STANDOFFS MAY BE
REQUIRED WHEN USING A WATERTIGHT
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
SUB-7520-HTR
ASSEMBLY
6297520 COVER GASKET
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
CONTROL THERMOSTAT
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
6297520 COVER GASKET
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
SUB-7520-HTR
ASSEMBLY
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
ADDITIONAL STANDOFFS MAY BE REQUIRED
WHEN USING A WATERTIGHT
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19013 #10 x 1-1/2 in. PAN
HEAD SCREW (4) PROVIDED
19033 #10-12 PLASTIC
ANCHOR (4) PROVIDED
06298 MOUNTING
TAB (4) PROVIDED
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
CONTROL THERMOSTAT
BACK BOX
HEATER ASSEMBLY
10.09 in.
(256mm)
4.79 in.
(122mm)
4.04
5.59
4.04
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
06298 MOUNTING
TAB (4) PROVIDED
19033 #10-12 PLASTIC
ANCHOR (4) PROVIDED
19013 #10 x 1-1/2 in. PAN
HEAD SCREW (4) PROVIDED
ADDITIONAL STANDOFFS MAY BE
REQUIRED WHEN USING A WATERTIGHT
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
SUB-7520-HTR
ASSEMBLY
6297520 COVER GASKET
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
CONTROL THERMOSTAT
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
6297520 COVER GASKET
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
SUB-7520-HTR
ASSEMBLY
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
ADDITIONAL STANDOFFS MAY BE REQUIRED
WHEN USING A WATERTIGHT
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19013 #10 x 1-1/2 in. PAN
HEAD SCREW (4) PROVIDED
19033 #10-12 PLASTIC
ANCHOR (4) PROVIDED
06298 MOUNTING
TAB (4) PROVIDED
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
CONTROL THERMOSTAT
THUMB LOCK
SUB 7500-HTR ASSEMBLY 1/8 in.
DEVICE WIRING
ACCESS HOLE
@ 50° OPEN @ 70°F
"HEAT ON" RED LED
"POWER ON" GREEN LED
ADDITIONAL EYELET FOR SECONDARY LOCK
19051 (4) #8-32 x
3/8 FLAT HEAD MS
STANDOFF MALE
FEMALE #8-32 x 3/8"
THUMB LOCK
SUB 7500-HTR ASSEMBLY 1/8 in.
DEVICE WIRING
ACCESS HOLE
CONTROL THERMOSTAT CLOSED
@ 50° OPEN @ 70°F
"HEAT ON" RED LED
"POWER ON" GREEN LED
ADDITIONAL EYELET FOR SECONDARY LOCK
19051 (4) #8-32 x
3/8 FLAT HEAD MS
STANDOFF MALE
FEMALE #8-32 x 3/8"
THUMB LOCK
629723 HINGED COVER
06297F-M BACKBOX
SUB-6297B20 3/4”
NPT CONDUIT HUB KIT
(NOT INCLUDED)
629721A FRAME
CONTROL THERMOSTAT CLOSED
@ 50° OPEN @ 70°F
STANDOFF MALE
FEMALE #8-32 x 3/8"
19051 (4) #8-32 x
3/8 FLAT HEAD MS
"HEAT ON" RED LED
DEVICE WIRING
ACCESS HOLE
"POWER ON"
GREEN LED
SUB 7500-HTR
ASSEMBLY 1/8 in.
ADDITIONAL EYELET FOR SECONDARY LOCK
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
SUB-7520-HTR
ASSEMBLY
6297520 COVER GASKET
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
CONTROL THERMOSTAT
07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)
6297520 COVER GASKET
19051 #8-32 x 3/8 in.
FLAT HEAD SCREW
(4) PROVIDED
SUB-7520-HTR
ASSEMBLY
19083 M-F #8-32 x 3/8 in.
STANDOFF (4) PROVIDED
ADDITIONAL STANDOFFS MAY BE REQUIRED
WHEN USING A WATERTIGHT
CONDUIT HUB (NOT INCLUDED)
19083 M-F #8-32 x 3/8 in.
19093 M-F #8-32 x 1-1/2 in.
19056 M-F #8-32 x 3 in.
19013 #10 x 1-1/2 in. PAN
HEAD SCREW (4) PROVIDED
19033 #10-12 PLASTIC
ANCHOR (4) PROVIDED
06298 MOUNTING
TAB (4) PROVIDED
NOTE: HOLE TO BE LOCATED
AND CUT IN BY INSTALLER
18021 3/4 in. NPT
WATERTIGHT CONDUIT
HUB (NOT INCLUDED)
CONTROL THERMOSTAT
HEATER ASSEMBLY
Dimensions and Technical Information
MODELS AVAILABLE
STI-7510A-HTR Cover with heater, external key lock and
STI-7510F-HTR Cover with heater, external key lock and
STI-7511A-HTR Cover with heater, external thumb lock and
STI-7511F-HTR Cover with heater, external thumb lock and
STI-7520-HTR Cover with heater, external key lock and
STI-7521-HTR Cover with heater, external thumb lock and
KIT-H18021 3/4” NEMA 4X Rated ridged conduit hub for “A”
KI T- H18 0 5 4 Additional key #CH751
KI T- 318 Adapter plate used for mounting “A”, “B” or “F”
KIT-6297B20 3/4” conduit hub kit for “F” back box (not
KIT-7500-HTR Replacement heater plate for STI-7510/11-HTR
KIT-7520-HTR Replacement heater plate for STI-7520/21-HTR
STI-7510F-HTR
STI-7511F-HTR
BACK BOX
8.09 in.(206mm)
10.09 in.
(256mm)
10.06 in.(256mm)
12.51 in.
(318mm)
13.17 in.
(335mm)
enclosed deep back box
enclosed back box
enclosed deep back box
enclosed back box
enclosed back box
enclosed back box
back box (not included)
back box to pedestal
included)
series
series
4.79 in.
(122mm)
7.11 in.
(181mm)
12.11 in.
(308mm)
1/4” DIAMETER
HEATER
ASSEMBLY
3.25 in.
(83mm)
STI-7520-HTR
STI-7521-HTR
9.94 in.
(252mm)
8.52 in.
(216mm)
F BACK BOX
8.46 in.
(214mm)
APPROVALS & WARRANTY
TESTING
STI-7520-HTR and STI-7521-HTR have been tested and approved or
listed by:
· NEMA 4X Certified
WARRANTY
Three year guarantee against breakage of polycarbonate in normal
use (one year on electro mechanical and electronic components).
HEATER OUTPUT
12 19
STI-7510A-HTR
STI-7511A-HTR
3.01 in.
(76mm)
1.88 in.
(47mm)
BACK BOX
HEAT
ON
POWER
VOLTS WATTS
16.5 36
24 77
BACK BOX
5.59 in.
(142mm)
7.53 in.
(191mm)
9.91 in.
(252mm)
9.94 in.
(252mm)
A BACK BOX
HEATER ASSEMBLY
HEATER
ASSEMBLY
5.17 in.
(131mm)
4.04 in.
(102mm)
8.41 in.
6.46 in.
(214mm)
(164mm)
Printed in U.S.A., © 1987-2020 Safety Technology International, Inc.
08 /19Subject to change without notice.
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