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Hello, the thermostats usually can be pried gently off of their wall mounted bases, if you can do that, hold the thermostat in your hand and the model number will be on the back, generally and RTH...... number.
Get that to me and I will see if I can pull the manual on it for you first thing in the morning.
I am a retired mechanical engineer and HVAC/ electrical/ refrigeration and boiler contractor ... with 56 years in this business. The last 20 of those years consulting for major firms nationally.
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