Environmental Technology SST–2 Installation And Operation Manual

®

Freeze Protection Thermostats

MODELS SST–2

Part Number 22744

MANUAL

We Manage Heat

®

Installation and Operation Manual

Environmental Technology, Inc.

1850 N Sheridan Street
South Bend, Indiana 46628
[phone] or [phone]
FAX [phone] or [phone]
http://www.networketi.com/

22804 11/07 [phone] http://www.networketi.com Environmental Technology, Inc.

Model SST–2

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Safety

Make all electrical connections in compliance with the National Electric Code
(NFPA 70) and local electrical code. If you have questions concerning the installation
or application, contact Customer Service.

Additional Information

More information is regularly made available through our website,
www.networketi.com. Please visit us online for datasheets, manuals, white papers,
technical articles and more. The most current and up to date version of this and
every other manual for our products can be found in Acrobat (pdf) format to view
online or to print. This is to assist you in installing and using our products to the best
effect possible. If you have any comments about this or any other material from
Environmental Technology please contact us.

Contacting Environmental Technology

For assistance, contact Customer Service. Offi ce hours are 8:00 AM until 5:00
PM ET.

Voice: [phone] (USA and Canada) or [phone] (elsewhere)

Fax: [phone] (USA and Canada) or [phone] (elsewhere)

E-mail: [e-mail]

Mail: Environmental Technology, Inc.

1850 North Sheridan Street

South Bend, IN 46628

Model SST–2

General

Description

The C-UL-US listed SST–2 Freeze Protection Thermostat replaces
electromechanical thermostats in cost-sensitive applications requiring ground fault
equipment protection (GFEP). The SST is classifi ed to UL and CSA safety standards
by UL for use in temperature-regulation applications. It is the ideal low-cost
thermostat for areas not subject to mechanical abuse.

Specifi cations

General

Area of use Nonhazardous locations
Approvals

Type 873
Temperature Regulating Equipment

109R

Enclosure

Protection NEMA 4x
Cover attachment Polycarbonate cover, machine screws
Entries 1 × 3/4" entry (bottom right) for NEC Class 2 sensor connections

3 × 1-1/16" entries (bottom left and left) for supply, load power and (right) NEC Class

2 alarm relay connections

Material Polycarbonate
Mounting Wall mounted

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Model SST–2

Front Panel Interface

Status indicator SUPPLY (green) power applied

SUPPLY (green, fl ashing) bad thermistor
HEAT (yellow) call for heat
GFEP (red) ground fault condition
GFEP (red, fl ashing) failed GFEP test
GFEP (red, fl ashing, rapid) GFEP test in progress

Remote Interface

Alarm relay Isolated SPDT 1 AMP Class 2 contact
Summary alarms No Power

Ground Fault Condition
GFEP function test failure
Bad or missing Thermistor

Control

Supply voltage 120, 208, 240 or 277 volts, single phase (automatically selected)
Contact type Two Form A DPST
Maximum Ratings Voltage: 277 VAC

Current: 30 amps

Temperature Sensor

Set point 40°F (4.4°C)
Dead band 2°F (1°C)
Sensor type Thermistor network
Circuit type NEC Class 2
Lead Length Up to 2,000' (610m) using 12 AWG 2-wire jacketed cable

Up to 500' (152m) using 18 AWG 2-wire jacketed cable

Ground Fault Equipment Protection (GFEP)

Set point 30 mA
Automatic self test Mode A: Verifi es GFEP function before contactors operate

Mode B: Verifi es GFEP function every 24 hours

Manual test/reset TEST/RESET switch on front panel

Environmental

Operating temperature −40°F to 130°F (−40°C to 55°C)
Storage temperature −67°F to 167°F (−55°C to 75°C)

Installation

Unpacking

Immediately inspect the packing material for damage. Unpack the SST–2,
taking care not to damage the packaging material. Save the packaging material until
normal operation has been established. If the unit must be returned, take care to
ensure that it is repackaged as it was received.

Packing List

22744 SST–2 Freeze Protection Thermostat
19272 Temperature Sensor
22804 SST–2 Installation and

Operation Manual

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Initial Inspection

Inspect the SST for shipping damage. If any of the following problems are

found contact the Customer Service Department.

• Contents incomplete or incorrect

• Internal or external mechanical damage
Customer service is available between 8:00 a.m. and 5:00 p.m. ET at

[phone] or [phone]. In the event of shipping damage, keep the
packing materials for inspection by the carrier. Normally, Environmental Technology,
Inc. will repair or replace the SST without waiting for the claims settlement.

Location

Housed in a NEMA 4X rated enclosure, the SST freeze protection thermostat

can be mounted in either indoor or outdoor environments. The SST was designed to
operate over an ambient temperature range of −40° to 136°F (−40° to 58°C).

Using the integral mounting fl anges, the SST is intended to be installed

on a fi xed, fl at, vertical surface. The mounting fl anges accommodate
fasteners.

The SST freeze protection thermostat nonmetallic enclosure is furnished with

3

/4" (21mm) conduit entries. The lower conduit entries provide for line voltage

two
supply branch circuit conductors. The conduit entry at the top-left of the enclosure
is for heater load branch circuit conductors. The installed weather-tight fi tting is for
the low voltage, NEC Class 2, temperature sensor. The Temperature Sensor may be
located up to 2,000' (610m) from the SST.

1

/4" (6mm)

Model SST–2

Supply Voltage

The SST freeze protection thermostat operates from 120, 208, 240 or 277 VAC

at 50/60 Hz. For line supply and load connections, use 10 AWG or larger wires rated
for at least 75°C (167°F) at 300 VAC.

Contactor Ratings

The heater contactor provides two (2) Form A (DPST) defi nite purpose contacts

rated for up to 30 amp AC heater loads at voltages at or below 277 VAC.

77/16"

(189mm)

11/

16”

(27mm)

41/4"

(108mm)

Conduit Entry

11/

16”

(27mm)

Conduit Entry

3

/8" (10mm) Ø

Temperature Sensor

Figure 1: SST–2 dimensions. See Appendix A.

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17/16"
(37mm)

20' (6m)
Sensor Cable,

3

/16" (5mm) Ø

Model SST–2

CONNECT LINE 2 (OR NEUTRAL) FROM INCOMING POWER TO BOTH LINE
2 RED AND NEUTRAL/WHITE INSIDE SST2 ENCLOSURE.
THIS CONNECTION PROVIDES POWER TO THE CONTROLLER.

FOR REMOTE

ALARM

CONTROL VIA

ISOLATED

SPOT CLASS 2

CONTACT

CONNECT BLACK SENSOR WIRE TO

ONE BLUE WIRE IN SST2

ENCLOSURE, AND CONNECT RED

SENSOR WIRE TO THE OTHER BLUE

WIRE. (PRE-WIRED IN AMBIENT

SST2-AMB MODEL)

208/240VAC

50/60 HZ

SAFETY GROUND

PHASE
PHASE

CONNECT LINE 2 (OR NEUTRAL) FROM INCOMING POWER TO BOTH
LINE 2 RED AND NEUTRAL/WHITE INSIDE SST2 ENCLOSURE.
THIS CONNECTION PROVIDES POWER TO THE CONTROLLER.

120, 277VAC

50/60 HZ

SAFETY GROUND

NEUTRAL

PHASE

SAFETY GROUND

FOR REMOTE ALARM ONLY

CONNECT BLACK SENSOR WIRE TO
ONE BLUE WIRE IN SST2 ENCLOSURE,
AND CONNECT RED SENSOR WIRE TO

THE OTHER BLUE WIRE

IN AMBIENT SENSING SST2-AMB

MODEL, SENSOR IS MOUNTED ON

SIDE OF ENCLOSURE AND PRE-

WIRED. FOR PIPE SENSING

APPLICATIONS INSTALL SENSOR

ON OPPOSITE SIDE OF PIPE

FROM HEATER CABLE. CABLE

CAN BE CUT SHORTER OR

REQUIRED. FOR EXTENSION USE

2C/ #18 JACKETED CABLE.

FOR REMOTE

ALARM CONTROL

VIA ISOLATED

SPOT CLASS 2

CONTACT

EXTENDED UP TO 500' IF

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NEC Class 2 Low Voltage Connections

All low voltage wiring shall use 18 AWG or greater stranded conductors with
thermoplastic insulation rated for at least 75°C (194°F) at 300 VAC. The temperature
sensor is supplied with a 20' (6m) 2-wire jacketed cable lead. The temperature
sensor lead may be up to 500' (152.4m) using 18 AWG 2-wire jacketed cable, or up
to 2,000' (609.6m) using 12 AWG 2-wire jacketed cable.

Temperature Sensor

The Temperature Sensor is required for the operation of the SST. The
Temperature Sensor connects via wire nuts to the two blue wires in the SST
enclosure. It does not matter which sensor wire is connected to which blue wire in
the enclosure. The sensor should be located near the heater being controlled and is
used to monitor its temperature.

Operating Instructions

Power On Startup Test

When power is applied to the SST–2 freeze protection thermostat, the LED
indicator lights in the SST enclosure will cycle for two seconds and then turn off,
except for the green SUPPLY indicator, which will remain lit whenever the SST
senses supply power.

Next, the SST–2 freeze protection thermostat performs a self-test of the
ground fault circuitry. This is the same test automatically performed approximately
every 24 hours. Failure of the ground fault circuitry self-test will disable the SST; call
Customer Service.

Model SST–2

Operation

The SST–2 freeze protection thermostat does not require user attention during
normal operation.

Status indicator SUPPLY (green) power applied

SUPPLY (green, fl ashing) bad thermistor
HEAT (yellow) call for heat
GFEP (red) ground fault condition
GFEP (red, fl ashing) failed GFEP test
GFEP (red, fl ashing, rapid) GFEP test in progress

GFEP Test

To manually verify the operation of the ground fault circuitry, momentarily
press the GFEP TEST/RESET switch on the SST. This should not normally be
necessary as the SST will test the ground fault circuitry when power is applied to
the unit and once approximately every 24 hours as long as power is supplied to the
unit.

GFEP Reset

In the event that a ground fault condition is detected by the SST heaters
will be turned off, if on, and heaters will be prevented from further operation until
the ground fault condition has been reset. The red GFEP Fault indicator will be
continuously on as long as there is power to the SST and a ground fault condition

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Model SST–2

remains. The ground fault condition will be persistent and will be remembered by
the SST even if the unit loses power.

To clear the ground fault condition momentarily press the GFEP TEST/RESET

switch on the SST.

Maintenance

The SST–2 does not require routine maintenance.

For technical help, questions or comments concerning this product or any
Environmental Technology, Inc. prod ucts contact the Customer Service Department
between 8:00am and 5:00pm ET at:

Voice: 800.234.4239 (USA and Canada) or 574.233.1202 (elsewhere)

Fax: [phone] (USA and Canada) or 574.233.2152 (elsewhere)

E-mail: [e-mail]

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Appendix A. SST–2 Dimensions.

41/4"

(108mm)

77/16"

(189mm)

Model SST–2

11/

16”

(27mm)

Conduit Entry

11/

16”

(27mm)

Conduit Entry

3

/8" (10mm) Ø

Temperature Sensor

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17/16"
(37mm)

20' (6m)
Sensor Cable,

3

/16" (5mm) Ø

Model SST–2

Appendix B. SST–2 Wiring Diagram.

CONNECT LINE 2 (OR NEUTRAL) FROM INCOMING POWER TO BOTH LINE
2 RED AND NEUTRAL/WHITE INSIDE SST2 ENCLOSURE.
THIS CONNECTION PROVIDES POWER TO THE CONTROLLER.

FOR REMOTE

ALARM

CONTROL VIA

ISOLATED

SPOT CLASS 2

CONTACT

CONNECT BLACK SENSOR WIRE TO

ONE BLUE WIRE IN SST2

ENCLOSURE, AND CONNECT RED

SENSOR WIRE TO THE OTHER BLUE

WIRE. (PRE-WIRED IN AMBIENT

SST2-AMB MODEL)

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Appendix C. SST–2 Wiring.

Model SST–2

208/240VAC

50/60 HZ

SAFETY GROUND

PHASE
PHASE

CONNECT LINE 2 (OR NEUTRAL) FROM INCOMING POWER TO BOTH
LINE 2 RED AND NEUTRAL/WHITE INSIDE SST2 ENCLOSURE.
THIS CONNECTION PROVIDES POWER TO THE CONTROLLER.

120, 277VAC

50/60 HZ

SAFETY GROUND

NEUTRAL

PHASE

SAFETY GROUND

FOR REMOTE ALARM ONLY

FOR REMOTE

ALARM CONTROL

VIA ISOLATED

SPOT CLASS 2

CONTACT

CONNECT BLACK SENSOR WIRE TO
ONE BLUE WIRE IN SST2 ENCLOSURE,
AND CONNECT RED SENSOR WIRE TO

THE OTHER BLUE WIRE

IN AMBIENT SENSING SST2-AMB

MODEL, SENSOR IS MOUNTED ON

SIDE OF ENCLOSURE AND PRE-

WIRED. FOR PIPE SENSING

APPLICATIONS INSTALL SENSOR

ON OPPOSITE SIDE OF PIPE

FROM HEATER CABLE. CABLE

CAN BE CUT SHORTER OR

EXTENDED UP TO 500' IF

REQUIRED. FOR EXTENSION USE

2C/ #18 JACKETED CABLE.

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Model SST–2

ORDERING INFORMATION

Order Number Description

22744 Model SST–2 Freeze Protection Thermostat
19272 Temperature Sensor (included)

LIMITED WARRANTY

ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Cus tom er Service for complete
warranty information.

DISCLAIMER

Environmental Technology, Inc. makes no representations or warranties, either expressed or implied, with respect to the contents
of this publication or the products that it describes, and specifi cally disclaims any implied warranties of mer chant abil i ty or
fi tness for any particular purpose. En vi ron men tal Technology, Inc. reserves the right to revise this pub li ca tion, and to make
changes and im prove ments to the products described in this publication, with out the ob li ga tion of En vi ron men tal Tech nol o gy,
Inc. to notify any person or or ga ni za tion of such revisions, chang es or improvements.

The ETI logo, Snow Switch, Floorstat, Tracon, We Manage Heat, APS, RCU, CIT, GIT, SIT are reg is tered trademarks of En vi ron men tal Technology, Inc.
Copyright © 2006 Environmental Technology, Inc. All rights reserved.

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