Bryan Boilers & 300 ユーザーズマニュアル

 

Date:  

8-4-2010 

 

Revision: 0 

 

Form:  

2396

 

A clean neutral hot water system should not be 
drained, except for an emergency or when 
unavoidable for servicing of equipment.  See 
Section 3.3 for water treatment required when 
refilling. 

Clean or replace all system piping and 
heating units 

Arrange for chemical or mechanical cleaning of 
the entire system.  A chemical treatment 
company should be consulted for the proper 
means of any chemical cleaning. 
Replace any piping that is deteriorated beyond 
safe or cleanable condition. 
Flush the system clean, being certain to isolate 
the boiler. 
 

For some old systems, there is a reluctance to 
clean the piping because of possible leaks 
occurring in badly corroded lines.  Should the 
customer refuse cleaning, it is necessary to 
install filtration equipment.  Install either a 
fibrous filter or a centrifugal filter in the boiler 
return piping.  This will collect and remove 
sediment from the system.  A booster pump may 
be required to overcome the additional pressure 
drop introduced in the line by the filter.  When 
filling the system, provide chemical treatment as 
outlined in Section 3.3. 
 
Failure to properly clean the system or to install 
mechanical sediment removal equipment can 
result in tube blockage and severe corrosion 
plus damage to pumps, controls, and air 
removal devices. 
                       
Inspect, repair as necessary, or replace system 
air control devices. 
 
Install gauge glasses on air expansion tanks and 
install a tank fitting in the system connection to 

the tank. 
 
Install a strainer in the boiler return piping. 

 

Purpose of water treatment 

Water treatment is required for satisfactory 
operation of the boiler.  It must be devised to 
prevent depositing of scale and corrosion from 
acids, oxygen and other such harmful elements 
that may be in the water supply.  A qualified 
water treatment chemist should be consulted 
and the water systematically treated. 
 

Objectives 

The basic objectives of water treatment are: 
Prevent the accumulation of scale and deposits 
in the boiler. 
Remove dissolved gases from the water. 
Protect the boiler against corrosion. 
Maintain the highest possible boiler fuel 
efficiency. 
Decrease the amount of boiler down time from 
cleaning. 
 

Water softener 

It is highly recommended that a zeolite water 
softener be used for all make-up to the boiler.  It 
is intended that this be used in addition to the 
chemical treatment of the boiler.  Water 
softening removes calcium and magnesium, the 
primary causes of hard boiler scale. 
 

Continuous monitoring required 

Water treatment should be checked and 
maintained whenever the boiler is operating.  
The boiler operator should be sure that the 
boiler is not operating for long periods without 
proper water treatment.  
Water treatment may vary from season to 
season or over a period of time.  Therefore, the 
water treatment procedure should be checked 
not less than four times a year, and possibly 
more frequently as the local water conditions 
may indicate. 
It should be noted that water boilers may well 
need chemical treatment for the first filling plus 
additional periodic chemical treatment, 
depending on system water losses and the 
makeup requirements. 

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Water treatment may vary from season to 
season or over a period of time.  Therefore, the 
water treatment procedure should be checked