Operating instructions

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 fl anges, the SST is intended to be installed
on a fi xed, fl at, vertical surface. The mounting fl anges 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 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.
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.
4
1
/
4
"
(108mm)
1
1
/
16”
(27mm)
Conduit Entry
3
/
8
" (10mm) Ø
Temperature Sensor
1
7
/
16
"
(37mm)
20' (6m)
Sensor Cable,
3
/
16
" (5mm) Ø
7
7
/
16
"
(189mm)
1
1
/
16”
(27mm)
Conduit Entry
Figure 1: SST–2 dimensions. See Appendix A.