Table of Contents
What happens when the electrical contacts close in the motorized valve? The circulator pump starts.
What materials are most commonly used for hydronic piping?
What two materials are most commonly used for hydronic piping? Copper and cross-linked polyethylene PEX.
What is an open piping system?
Piping systems can be open or closed. An open system is affected by atmospheric pressure. The flow in open condensate return and plumbing drainage systems is gravitational. The pipe sections of an open network system are either all supply or all return. A closed network system includes both supply and return sections.
What is a hydronic terminal unit?
A hydronic piping system is used to circulate chilled or hot water with the connections between the piping and the terminal units made in a series loop. The terminal units are the heat exchangers that transfer the thermal energy between the water and the spaces to be cooled or heated.
What do modern hydronic systems used to circulate the hot water?
Hydronic systems in older homes circulate steam to cast-iron radiators. Modern systems deliver hot water to smaller, baseboard heaters. Other modern systems circulate heated water through radiant heating loops installed under the flooring. These systems keep the floor warm while heating the house.
Why do closed hydronic systems include pressure relief valves?
Why do closed hydronic systems include pressure-relief valves, expansion tanks, and temperature and pressure limiting devices? Because water expands and contracts as its temperature changes. You just studied 37 terms!.
Can I use PEX for hydronic heating?
Yes, PEX pipe is approved for radiant or hydronic heating applications. Since ferrous components are likely to be present in the system, it is important to use oxygen barrier PEX pipe to help prevent ferrous components from rusting.
What’s the difference between an open and closed plumbing system?
Open vs. closed water heater system. Since nothing stops the water from expanding, the pressure in the open system is always equal to the supply pressure. A closed water heater system means that the hot water cannot expand beyond the valves and mix with the municipal water.
How does a motorized zone control valve work?
Each zone valve is controlled by its own zone thermostat. End switches in each zone valve control the central circulator and the burner. When it reaches the fully open position, the end switch “makes” (makes contact), causing the aquastat relay to pull in, starting the circulator and the burner.
What is a closed plumbing system?
A closed plumbing system prevents water from flowing in the reverse direction (i.e., water won’t flow back into city lines once it enters your home’s pipes). Since most new homes are built with a closed plumbing system, chances are, you’ll need an expansion tank.
Why is air detrimental to a hydronic heating system?
Air in a hydronic system is bad news because 1) dissolved air in the water will corrode/rust any piping or equipment made of ferrous materials and 2) free air within the piping will prevent flow, either partially or fully. Air lock within a piping system can stop flow as effectively as a closed valve.
What is the normal charge on a residential diaphragm type of expansion tank?
What is the normal charge on a residential diaphragm type of expansion tank? 12 psig.
How hot is the water in a hydronic heating system?
Radiant-floor heating systems typically use water temperatures of 85-140°F (30-60°C), compared with baseboard hydronic systems that typically operate at 130-160°F (55-70°C).
How does hydronic heating system work?
Hydronic heating works by circulating heated water throughout the home via a sealed pipe network. Unlike other heating systems that use fans or vents to blow warm air around the room, hydronic heating heats objects through radiation, which results in an even distribution of comfortable heat.
Where should the water pressure reducing valve located in a hot water hydronic system?
Where are pressure reducing valves located? They are located on the main water supply line.
What is the disadvantage of mixing domestic hot water with hydronic system hot water?
Certain hydronic heating components are not intended or certified for use with potable water. If non-potable components are installed so that plumbing water flows through them, then this type of installation most likely would violate regulations, may contaminate drinking water, and may void product warranties.
What is a closed hydronic system?
Your hydronic heating system is a closed system. The water in the heating system is separated from your drinking water, and you are protected by a one-way valve from heating water back flowing. Water is not compressible. As your system heats up from room temperature the water expands, increasing the water volume.
What is hydronic pressure?
A hydronic system is a system designed to circulate chilled or hot water with the connections between piping and terminal units (heating and/or cooling devices). Hydronic balancing is the process of optimizing the distribution of water in a building’s heating or cooling system by equalizing the system pressure.
What is orange PEX used for?
Designed for use on hot and cold potable water lines, Orange PEX tubing is commonly used for radiant floor and hydronic heating applications.
What is the difference between blue and red PEX pipe?
PEX Particulars Although there are three types of PEX (see Label Lingo, below), the different colors don’t connote the distinctions; they simply make it easy for the installer to identify which lines carry hot water and which carry cold. Red PEX pipe carries hot water. Blue PEX pipe carries cold water.
Can SharkBite fittings be used on PEX A?
SharkBite brass push-to-connect fittings are compatible with PEX, Copper, CPVC, PE-RT and SDR-9 HDPE pipe. SharkBite fittings come with a PEX stiffener pre-loaded into the fitting for PEX, PE-RT and SDR-9 HDPE. The PEX stiffener does not need to be removed for Copper or CPVC applications.
