STI 7520-HTR User Manual

Safety Technology International, Inc.

2

306 Airport Road • Waterford, Michigan 48327-1209
Phone: [phone] • Fax: [phone]
Toll Free: 800-88 8-4784 • E-mai l: info @sti-us a.com
Web: www.sti-usa.com

Safety Technology International (Europe) Ltd.

U

nit 49G Pipers Road • Park Farm Industrial Estate • Redditch

W

orcestershire • B98 0HU • England • Tel: [phone]
Fax: [phone] • Freephone: 0800 085 1678 (UK only)
E-mail: [e-mail] • Web: www.sti-europe.com

7

.11 in.

(181mm)

12.11 in.
(308mm)

8.46 in.

(214mm)

3.25 in.
(83mm)

12.51 in.
(318mm)

13.17 in.
(335mm)

8

.09 in.(206mm)

10.06 in.(256mm)

1/4” DIAMETER

07503 THUMB LOCK (STI-7521-HTR)
18050 KEY LOCK (STI-7520-HTR)

6

297520 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

A

ND CUT IN BY INSTALLER

18021 3/4 in. NPT

WATERTIGHT CONDUIT

H

UB (NOT INCLUDED)

CONTROL THERMOSTAT

1

0.09 in.

(256mm)

4.79 in.

(122mm)

REMOVE

ILLUSTRATION 1

INSTALLATION OF HEATED PROTECTIVE CABINETS STI-7520-HTR, STI-7521-HTR

All specifications and information shown were current as of publication, and are subject to change without notice.

ILLUSTRATION 2

INSTALLATION INSTRUCTIONS

1. Remove heater plate assembly (Illustration 1) from back box by removing 4 flat head
screws and set aside.

2. Mount back box and cover assembly in desired position. With hinges horizontal or
vertical, insert the (4) mounting tabs into the back box slots (see Illustration 2).

Mark and drill (4) 1/4” diameter holes 1 1/4” deep. Insert plastic anchors and screw
back box to wall with (4) #10 x 1 1/2” screws.

3. Route wires for heater and appliance into back box through conduit or small hole
properly sealed.

Electronic warranty form at www.sti-usa.com/wc14

7520-HTR IS JAN 2010

Safety Technology International, Inc.

2

306 Airport Road • Waterford, Michigan 48327-1209
Phone: [phone] • Fax: [phone]
Toll Free: 800-88 8-4784 • E-mai l: info @sti-us a.com
Web: www.sti-usa.com

Safety Technology International (Europe) Ltd.

U

nit 49G Pipers Road • Park Farm Industrial Estate • Redditch

W

orcestershire • B98 0HU • England • Tel: [phone]
Fax: [phone] • Freephone: 0800 085 1678 (UK only)
E-mail: [e-mail] • Web: www.sti-europe.com

“HEAT ON”

RED LED

“POWER ON”

GREEN LED

CONTROL THERMOSTAT

CLOSED @ 50°F

OPEN @ 70°F

#6-32 THREADED HOLES

FOR MOUNTING ELECTRONIC

DEVICE (6 PLACES)

SUB-7520-HTR
(FRONT VIEW)

D

EVICE WIRING

ACCESS HOLE

O

VER TEMP SAFETY

T

HERMOSTAT

OPEN @ 120°F

CLOSED @ 90°F

LOW TEMP WARNING

THERMOSTAT

C

LOSED @ 32°F

OPEN @ 50°F

RESISTOR HEATER

SUB-7520-HTR

(BACK VIEW)

TERMINAL BLOCK
(4 CONNECTION)

1

/8 in. THICK ALUMINUM

M

OUNTING PLATE

LED CONTROL

ILLUSTRATION 3

ILLUSTRATION 4

JAN2010

4. Connect heater power and control wires.

a. Connect low temperature monitor terminals to supervisory panel

if used (see Illustration 3).

b. Connect power terminals to power source. 12-24 volt AC/DC.

• Heating capacity is determined by input voltage. Be sure
the power source has enough capacity to support the load
at the input voltage.

12 Volt, 19 WATTS

16.5 Volt, 36 WATTS

24 Volt, 77 WATTS

• 16.5 VAC adapter included

5. Mount the heater plate assembly to the back box with
control thermostat toward bottom of enclosure (see
Illustration 2). Be sure to route wires for electronic device
through the hole in the center of the heater plate before
attaching heater plate. For vertical mounting (hinges to
right or left side) be sure control thermostat is towards
the bottom of the enclosure.

6. Connect the electronic device and mount to the heater
plate in mounting holes indicated using #6 - 32 x 1/2”
screws (2) provided.

NOTE: If moisture buildup occurs, drill a weep

hole on bottom side of back box.

7520HTR INSTALL