What allows the safety relay to operate?
A) heating up the heat exchanger B) increasing the current flow
C) decreasing the current flow D) shutting off the burner
B
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In order to trim a space for a non-flanged valve, _____.
a. the project specifications must allow the insulation to be thinned b. the insulation cannot be flexible foam c. the insulation must be molded fiberglass d. a cover must be fitted over the valve
Briefly describe the changes that occur in the abilities of older drivers (aged 65 and over) that influence their driving capability.
What will be an ideal response?
____________________ are loads found in many systems and wiring diagrams that are responsible for taking electric energy and convert it to heat.
Fill in the blank(s) with the appropriate word(s).
Thermocouples produce voltage because of the action of two dissimilar metals. The voltage produced depends on the type of metals used and the _____ difference between the junction and the open ends.
A. distance B. height C. time D. temperature