Mercury Bulb, heat-anticipator and a cold-anticipator.
A cold anticipator
First check your thermostat to determine if the anticipator is set correctly and is operating properly.
An anticipator is a device in a thermostat which determines when to turn on or shut off the heating or cooling mechanism.
it may blow cold air due to the fact that the heat anticipator on your thermostat may be set to long. you can change useing your owners manual for your thermostat but you should have a service tech do it
Parallel with the cooling contacts
The cast of Anticipation - 2012 includes: Will Deperi as Anticipator
The noun form for the verb to anticipate is anticipator, one who anticipates. Anticipation is another noun form.
True
Is a slider for the "adjustable heat anticipator assembly"
A Heat Anticipator is really a potentiometer connected to (possibly) two resistors. You may see these resistors behind a mechanical thermostat "coil". When the heater is running, current flows and heats up the resistors, making the heater turn off a little early so that it doesn't overshoot the temp you have set. If the pot is set at it maximum resistance, the resistors heat less, it just makes sense. Check your manual on your thermostat for proper settings.
In the instruction manual for the furnace, it will either give you the heat anticipator setting or instruct you how to do it. If its digital, well then follow the thermostat instructions