Справочник Пользователя для Burnham 1100-H4

  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 make-up water as a result 

of system leaks.

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 make-up water.

b.  Eliminating open tanks from the system.
c.  Eliminating and/or repairing fittings which allow 

oxygen absorption.

d.  Use of non-permeable materials in the 

distribution system.

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.

  Low Water Cut Off (LWCO) on Hot Water Boilers 

(Optional)

 

   

 

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.

 

   

 

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.

 

The SCG boiler is designed to accept the wiring of the 

Safgard Model 1100-H4 (P/N 100592-01) LWCO.  This 

is a probe type LWCO.  The factory wiring is designed 

to allow simple “Plug-in” installation of the wiring.

 

   

 

A “tee” is commonly used to connect the probe LWCO 

to the supply or return piping, as shown below.

 

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.