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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

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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