My thermostat temp reading is approximately two degrees lower than the correct reading which I verified by three other thermometers. How can I adjust the temp reading in my Totaline thermostat P274-0100?

Thanks

I found this site which answered my own question!!
For anyone else having questions about the Totaline thermostat P274-0100-C, P274-0200-C, P274-0300-C, here is a website I found:

http://www.xpedio.carrier.com/idc/groups/public/documents/techlit/p274-7si.pdf