HVAC Products Containing Mercury and Proper Disposal

HVAC Products Containing Mercury and Proper Disposal – Mercury is extremely harmful to the environment and cause severe health problems in humans and animals. For many years HVAC and HVAC Controls manufacturers have used mercury in switches. Mercury is a liquid metal and provides a good source used in many switches because of its fluidity and conductivity. From thermostats to boiler controls the liquid metal provides a reliable and efficient switching mechanism to start and stop certain sequences in HVAC applications. (more…)

Boiler Circulator Pump – Hydronic Components

Boiler Circulator PumpBoiler Circulator Pump - The boiler circulator pump induces the flow of hot water through the boiler and the boiler loop. Usually, the boiler circulator pump is controlled by the aquastat. However, there are various levels of control that can be found that control pumps. One way is by the aquastat as mentioned above. Another way is by an end switch in a zone valve. A thermostat in a particular zone will call for heat and the thermostat calls for the zone valve to open. When the zone valve is fully open an end switch closes the circuit to energize the circulator pump. Typically, the circuit is a control circuit so when the end switch closes it closes the circuit for a relay to energize the circulator pump (more…)

Hot Water Boiler Expansion Tanks – HVAC Hydronics

Hot Water Boiler Expansion Tanks – There are two types of expansion tanks used on hot water boiler systems. The steel expansion tank and the bladder type expansion tank. These expansion tanks are used to provide a cushion for the expansion of water when it is heated. Without this cushion of air, the pressure in the boiler system would exceed the setting on the pressure relief valve. This will cause the pressure relief valve to open and discharge water to relieve the pressure. (more…)

Boiler Components and Controls – HVAC Hydronics

Boiler Components and ControlsBoiler Components and Controls - All hot water boilers must have an expansion tank. Water expands when it is heated. There must be a place for it to expand to so that the pressure in the boiler loop remains constant. Without a hot water boiler expansion tank the pressures in the boiler loop system would vary wildly. Most likely, the pressure will exceed the maximum pressures designed for the boiler hot water loop system. This will result in setting off the pressure relief valve. (more…)

Domestic Hot Water Mixing Valve and Domestic Storage Tank

Domestic Hot Water Mixing Valve and Domestic Storage TankDomestic Hot Water Mixing Valve and Domestic Storage Tank

Domestic Hot Water Mixing Valve and Domestic Storage Tank - This domestic hot water mixing valve offers a way to temper the hot water coming from a hot water loop and boiler. It is very important to maintain the appropriate and desirable temperatures of water used for domestic water use. First, you want to maintain a safe temperature so people are scolded by extremely hot water temperatures. Boiler loops generally work on a temperature of 180 degrees Fahrenheit and this temperature is too hot for human contact without scolding or seriously burning the skin. A mixing valve is used in the loop to maintain a safe temperature for human comfort. The hot water is mixed with cold water at the mixing valve and the result is the temperature dialed into the mixing control valve which has a range of 120 degrees to 140 degrees if used for domestic hot water applications. Other mixing valves can be purchased that will give a whole range of temperatures including mixing valves that can be controlled by PLCs or DDC to maintain specific temperature ranges for whatever the desired temperature is for the application. (more…)

Hot Water Boiler Economizer PreHeater | Energy Efficiency

Hot Water Boiler Economizer PreHeaterHot Water Boiler Economizer PreHeater | Energy Efficiency

This is a hot water economizer and is a big preheater for domestic hot water use. This boiler plant serves a large community for heating and domestic hot water use. Domestic hot water is used for showers, washing dishes, laundry, ect, ect, ect…. The cold water supply from the city is routed through the economizer to be pre-heated before it goes through a heat exchanger and then the hot water storage tank. This system saves money because it uses the exhaust gases from the boiler to pre-heat the city water supply which is normally 50 degrees Fahrenheit. The exhaust gases from the boiler would otherwise be vented to the atmosphere and would be considered wasted heat. (more…)

Boiler Systems and Installation | HVAC Heating

Boiler Systems and Installation

Boiler Systems and Boiler Installation - It is very important to get it right the first time!

Boiler Systems and Installation - Purchasing a boiler can be daunting for most people as many people do not understand boilers and do not know what certain components are with boiler systems. Typically they trust the installing contractor to outfit and install the boiler with all the proper boiler components including making recommendations for optional boiler components.  There are resources we can use to try to understand boiler components but overall this research or study will not make one an expert in boiler installation. We simply have to trust the boiler installer and the skills of the contractor.


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