IV. Water Piping and Trim
WARNING
Failure to properly pipe boiler may result in improper operation and damage to boiler or structure.
Oxygen contamination of boiler water will cause corrosion of iron and steel boiler components, and can lead to boiler failure. Burnham’s Standard Warranty does not cover problems caused by oxygen contamination of boiler water or scale (lime)
A.Design and install boiler and system piping to prevent oxygen contamination of boiler water and frequent water additions.
1.There are many possible causes of oxygen contamination such as:
a.Addition of excessive
b.Absorption through open tanks and fittings.
c.Oxygen permeable materials in the distribution system.
2.In order to insure long product life, oxygen sources must be eliminated. This can be accomplished by taking the following measures:
a.Repairing system leaks to eliminate the need for addition of
b.Eliminating open tanks from the system.
c.Eliminating and/or repairing fittings which allow oxygen absorption.
d.Use of
e.Isolating the boiler from the system water by installing a heat exchanger.
f.Use properly designed and operating air elimination devices in water piping.
B.Low Water Cut Off (LWCO) on Hot Water Boilers (Optional)
WARNING
DO NOT ATTEMPT to cut factory wires to install an aftermarket Low Water Cut Off (LWCO). Only use connections specifically identified for Low Water Cut Off.
In all cases, follow the Low Water Cut Off (LWCO) manufacturer’s instructions.
When
A low water cutoff is required to protect a hot water boiler when any connected heat distributor (radiation) is installed below the top of the hot water boiler (i.e. baseboard on the same floor level as the boiler). In addition, some jurisdictions require the use of a LWCO with a hot water boiler.
Where
The universal location for a LWCO on both gas and oil hot water boilers is above the boiler, in either the supply or return piping. The minimum safe water level of a water boiler is at the uppermost top of the boiler; that is, it must be full of water to operate safely.
What Kind
The SCG boiler is designed to accept the wiring of the Safgard Model
How to Pipe
A “tee” is commonly used to connect the probe LWCO to the supply or return piping, as shown below.
LWCO Location
Select the appropriate size tee using the LWCO manufacturer’s instructions. Often, the branch connection must have a minimum diameter to prevent bridging between the probe and the tee. Also, the run of the tee must have a minimum diameter to prevent the end of the probe from touching or being located too close to the inside wall of the run of the tee.
Ideally, manual shutoff valves should be located above the LWCO and the boiler to allow for servicing. This will allow probe removal for inspection without draining the heating system. Many probe LWCO manufacturers recommend an annual inspection of the probe.
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