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Please explain the settings of SW1 on the back of the 8870?

April 26, 2017explain settings sw1

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Please explain the settings of SW1 on the back of the 8870?

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The switches are used to control some of the features of the thermostat. SW1-1 Master/Slave should always be in the slave position when used with an automation system, SW1-2 Electric/Fossil will be set to your heating plant type, SW1-3 Single/Multi is set to the number of stages your HVAC has, SW1-4 Ht. Pump/H-C would be set to Ht. Pump for a heat pump application and H/C for and standard heat/cool system. For more clarification on these settings refer to document B2202660.