Operating instructions, Nec class 2 low voltage connections, Temperature sensor – King Electric SST 2 User Manual
Page 9: Power on startup test, Operation, Gfep test, Gfep reset
Model SST–2
22804A
11/09
(800) 234-4239
http://www.networketi.com
9 of 14
Environmental 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 fixed set point 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 fixed set point 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 fixed set point 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