Operating instructions

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, 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