Chapter 14, Problem 1RQ

Why is a low-voltage thermostat normally more accurate than a high-voltage thermostat?

To determine

The reason for high accuracy of low voltage thermostat then high voltage thermostat.

Explanation of Solution

Thermostat:

Thermostat is an electronic device which used to sense the temperature of physical system.

Thermostat is of two types.

1. Low voltage thermostat
2. High voltage thermostat

Low voltage thermostat:

Low voltage thermostat operating voltage is $5-25$ voltages.

Generally low voltage thermostat is Powered by step down transformer.

It is used in electric furnaces, single stage heat pump and multistage heating and cooling heat pumps.

High voltage thermostat:

High voltage thermostat operating voltage is $130-250$ voltages.

It is used in wall mounted mini split system, baseboard heaters, single zone system, electric space heaters.

The response of high voltage thermostat which contains a large bimetal would be slow to the air temperature changes thus, low voltages controls are more efficient than high voltage thermostat.