King Electric SST 2 - Manual (Page 5)

Model SST–2
22804A 11/09 (800) 234-4239 http://www.networketi.com 5 of 14 Environmental Technology, Inc.
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
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 P/N 22744: 40°F (4.4°C)
P/N 23708: 175°F (80°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 Enclosure: −40°F to 130°F (−40°C to 55°C)
Std Temp (SST–2 40) Sensor: −40°F to 220°F (−40°C to 104°C)
High Temp (SST–2 175) Sensor: −40°F to 300°F (−40°C to 149°C)
Storage temperature −67°F to 167°F (−55°C to 75°C)