King Electric GPT 3 - Manual (Page 10)

Page 10 of 21
Operation
Normal
The GPT–3 requires little or no attention after installation. Although changing the
temperature setting can improve heating system performance, this is seldom necessary. Minimum
energy use occurs when the the temperature is set to the minimum value providing the desired
heating performance.
Normal operation occurs when neither the Fault nor the GFEP indicators operate and the
Alarm relay is off. Otherwise, operation is abnormal.
Abnormal
With one exception, operation of either the Alarm relay or Fault indicator or both means that
a failure has occurred that requires a qualified electrician to correct. The exception is momentary
indication of a self-limiting heater failure as is shown by blinking the Heater indicator when
the GPT–3 is used with self-limiting cable. The GPT–3 detects a self-limiting heater failure by
measuring its temperature at the far end of the cable. Depending upon how long it takes the cable
to reach its operating temperature such that the monitor sensor is less than 5°F (3°C) below the
control sensor temperature, the GPT–3 may momentarily declare a cold heater.
Many indicators display additional information concerning equipment failures through
flashing. Check the Troubleshooting section for additional information since service by qualified
personnel is required.
Installation
First
Inspect the package and its contents for damage. In the event of damage, immediately
contact Environmental Technology, Inc. Customer Service.
Next
Check the contents of the package against the pro forma Packing List shown below. If
discrepancies are found, contact ETI Customer Service before starting the installation.
Pro Forma Packing List
Order Number Quantity Description
19425 1 GPT–3 Freeze Protection Thermostat
19272 2 Temperature Sensor
20656 1 GPT–3 Installation and Operation Manual
18703 4 Wire Nuts, Red