Final answer:
In a remote bulb thermostat, the diaphragm opens or closes electrical contacts in response to temperature changes, controlling heating or cooling equipment to maintain desired conditions.
Step-by-step explanation:
In a remote bulb thermostat, the pressure exerted by the diaphragm on the mechanical linkage will open and close a set of electrical contacts.
A remote bulb thermostat operates on the principle that a fluid inside the bulb expands and contracts with temperature changes. This expansion and contraction cause a change in pressure that is detected by the diaphragm. When the pressure reaches a certain level, it acts upon the mechanical linkage, which in turn opens or closes electrical contacts to control the operation of heating or cooling equipment.
The actions of the diaphragm and the mechanical linkage in the thermostat are precise and respond to the temperature setpoint, which is user-adjustable. As the room temperature reaches the set temperature, the system either turns on or off to maintain the desired ambient condition.