In hydronic heating systems, a circulating pump moves hot water from a boiler through the supply piping system to the terminal devices and back to the boiler.

A ___ lamp is a lamp that produces light from an arc tube.

___ detect a low level of current unbalance between a hot/neutral conductor and ground wire and instantaneously open the circuit in response.

Trap seal loss is virtually eliminated when a(n) ___ vent is employed since the plumbing system is relieved of negative and positive pressure at every fixture trap.

The ___ is the “brain” of the fire protection system and is equipped with a user interface to provide operators with system information.

Apparent power is the actual power used in an electrical circuit.

___ diagrams are used to make repairs, troubleshoot problems, or inspect circuits.

Power companies primarily use 3ϕ transformers connected in different combinations to deliver the correct power to customers.

A capillary tube runs from the hot gas discharge line on the ___ to the pilot valve cylinder.

___ is commonly used for water service piping, cold and hot water distribution, and hydronic (radiant) heating systems.