ETI SST-2 User manual

MANUAL
22804 11/07 [phone] http://www.networketi.com Environmental Technology, Inc.
Environmental Technology, Inc.
1850 N Sheridan Street
South Bend, Indiana 46628
[phone] or [phone]
FAX [phone] or [phone]
http://www.networketi.com/
We Manage Heat ®
®
Freeze Protection Thermostats
MODELS SST–2
Part Number 22744
Installation and Operation Manual

Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
2 of 12 Environmental Technology, Inc.

Model SST–2
22804 11/07 [phone] http://www.networketi.com 3 of 12Environmental Technology, Inc.
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. Office 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: [email protected]
Mail: Environmental Technology, Inc.
1850 North Sheridan Street
South Bend, IN 46628
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 classified 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.
Specifications
General
Area of use Nonhazardous locations
Approvals
109R
Type 873
Temperature Regulating Equipment
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

Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
4 of 12 Environmental Technology, Inc.
Front Panel Interface
Status indicator SUPPLY (green) power applied
SUPPLY (green, flashing) bad thermistor
HEAT (yellow) call for heat
GFEP (red) ground fault condition
GFEP (red, flashing) failed GFEP test
GFEP (red, flashing, 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: Verifies GFEP function before contactors operate
Mode B: Verifies 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

Model SST–2
22804 11/07 [phone] http://www.networketi.com 5 of 12Environmental Technology, Inc.
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 flanges, the SST is intended to be installed
on a fixed, flat, vertical surface. The mounting flanges accommodate 1/4" (6mm)
fasteners.
The SST freeze protection thermostat nonmetallic enclosure is furnished with
two 3/4" (21mm) conduit entries. The lower conduit entries provide for line voltage
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 fitting is for
the low voltage, NEC Class 2, temperature sensor. The Temperature Sensor may be
located up to 2,000' (610m) from the SST.
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) definite purpose contacts
rated for up to 30 amp AC heater loads at voltages at or below 277 VAC.
41/4"
(108mm)
11/16”
(27mm)
Conduit Entry
3/8" (10mm) Ø
Temperature Sensor
17/16"
(37mm)
20' (6m)
Sensor Cable,
3/16" (5mm) Ø
77/16"
(189mm)
11/16”
(27mm)
Conduit Entry
Figure 1: SST–2 dimensions. See Appendix A.

Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
6 of 12 Environmental Technology, Inc.


































Figure 2: SST–2 wiring. See Appendix B.





 



















Figure 3: SST–2 dimensions. See Appendix B.

Model SST–2
22804 11/07 [phone] http://www.networketi.com 7 of 12Environmental Technology, Inc.
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.
Operation
The SST–2 freeze protection thermostat does not require user attention during
normal operation.
Status indicator SUPPLY (green) power applied
SUPPLY (green, flashing) bad thermistor
HEAT (yellow) call for heat
GFEP (red) ground fault condition
GFEP (red, flashing) failed GFEP test
GFEP (red, flashing, 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

Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
8 of 12 Environmental Technology, Inc.
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. products 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: [email protected]

Model SST–2
22804 11/07 [phone] http://www.networketi.com 9 of 12Environmental Technology, Inc.
Appendix A. SST–2 Dimensions.
41/4"
(108mm)
11/16”
(27mm)
Conduit Entry
3/8" (10mm) Ø
Temperature Sensor
17/16"
(37mm)
20' (6m)
Sensor Cable,
3/16" (5mm) Ø
77/16"
(189mm)
11/16”
(27mm)
Conduit Entry

Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
10 of 12 Environmental Technology, Inc.
Appendix B. SST–2 Wiring Diagram.





 




















Model SST–2
22804 11/07 [phone] http://www.networketi.com 11 of 12Environmental Technology, Inc.
Appendix C. SST–2 Wiring.



































Model SST–2
11/07 22804(800) 234-4239http://www.networketi.com
12 of 12 Environmental Technology, Inc.
LIMITED WARRANTY
ETI’s two year limited warranty covering defects in workmanship and materials applies. Contact Customer 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 specifically disclaims any implied warranties of merchantability or
fitness for any particular purpose. Environmental Technology, Inc. reserves the right to revise this publication, and to make
changes and improvements to the products described in this publication, without the obligation of Environmental Technology,
Inc. to notify any person or organization of such revisions, changes or improvements.
The ETI logo, Snow Switch, Floorstat, Tracon, We Manage Heat, APS, RCU, CIT, GIT, SIT are registered trademarks of Environmental Technology, Inc.
Copyright © 2006 Environmental Technology, Inc. All rights reserved.
ORDERING INFORMATION
Order Number Description
22744 Model SST–2 Freeze Protection Thermostat
19272 Temperature Sensor (included)