12
Setting the Heat Pump / Conventional Switch (#1)
Note: The Lightstat TME must be powered Off and On in order to “read” a
change of switch settings. Moving this switch to the ON position will increase the
heating Setback by 5° (F). This will allow a heat pump to stay in a compressor
mode longer and avoid expensive electric resistance heat.
Note: When connecting a Lightstat TME to a heat pump with Thermostat
Reversing Valve Control you will need to install a jumper wire between W1 and
Y1 at the Lightstat TME as shown in the diagram above.
Note: When connecting a Lightstat TME to a heat pump with Unit Reversing
Valve Control no jumper wire is required as the reversing valve is positioned by
the unit internal controls based on whether cooling or heating is being called by
Y1, Y2 or W1, W2.
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