![]() Press the HOLD button again to return the thermostat to the normal program operation. The current set point temperature will be held either permanently or for 24 hours, depending on the setting selection made in section 4. Press the HOLD button to bypass the program schedule. Old Terminal from New Terminal for New Terminal for Existing Thermostat New Thermostat New Thermostat (PSTS21P52) (PSTS11P52)Ĭooling Transformer Heating Transformer 24 VAC Reversing Valve (Heating) Reversing Valve (Cooling) Cooling or Compressor for HP System 1st Stage Heat or Emergency Heat Fan Control 24 VAC Common 2nd Stage Heatġ. Be sure to use the correct column for the new thermostat. Note the chart includes information for Proselect® PSTS11P52 and PSTS21P52 thermostats. As an example, if the old thermostat had a G connection, it goes to G on the new thermostat. Use the chart below to determine the new thermostat connections. Remove the old sub-base from the wall, again being careful that the wires do not slip into the hole in the wall. Secure the wires to prevent them from slipping into the hole in the wall. After labeling the old wires, loosen each connection and remove them from old sub-base. Depending on the brand of the old thermostat, your letters may be different. Label every old wire with the letter of the connection to which the wire is attached. The old sub-base should remain wired and on the wall until steps 4 and 5. Depending on the brand, these parts may pull off or need to be unscrewed. Carefully remove the cover and electronics body from the old thermostat sub-base. ![]() Always turn off power to the air conditioning or heating system prior to removing existing thermostat.
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