Utica Boilers UB90-100 Installationsanweisungen

•  Use only antifreeze products recommended 

•  Continuous addition of make-up water will dilute 

power of antifreeze and change buffers ability to 
maintain pH.

•  Flush old antifreeze from system. Flush boiler and 

system separately.

•  Do not use antifreeze unless required.

•  Antifreeze, if needed, must be of type listed on 

next page due to their operational characteristics 
of : type 356 T6 aluminum at operating 
temperatures between 20°F (-6.7°C) and 250°F 
(121°C). (See Table 8 for allowable products.)

•  Always clean system prior to using antifreeze as 

stated in this supplement.

•  Follow antifreeze manufacturer’s instructions for 

use, safe handling and storage of their products. 
Refer to MSDS (Material Safety Data Sheets) 
provided by antifreeze manufacturer for potential 
hazards and fi rst aid procedures for exposure or 
ingestion.

•  Antifreeze will raise pH of hydronic solution in 

heating system above recommended level due to 
corrosion inhibitors. Solution must be treated to 
maintain a pH within recommended level. Follow 
antifreeze manufacturer’s instructions to adjust 
pH. 

•  If system has leaked, water and antifreeze 

chemistry will need to be adjusted. To avoid 
damage to boiler, check pH and chemistry of boiler 
solution and consult the antifreeze manufacturer 
for recommendations. 

•  Recommend taking pH reading annually, and 

adjusted as necessary. Follow antifreeze/inhibitor 
manufacturer’s instructions for details on how to 
adjust pH. 

•  Antifreeze solutions can break down over time. 

Failure to check antifreeze chemistry on annual 
basis  may result in accelerated corrosion of 
boiler and other system components. Consult with 
antifreeze manufacturer for recommendations.

•  Use of antifreeze in any boiler will reduce 

heating capacity as much as 10-20%. Take 
into consideration when sizing heating system, 
pumps and expansion tank. Consult antifreeze 
manufacturer’s literature for specifi c information 
on reduced capacity. 

•  Using antifreeze manufacturer’s instructions, 

determine freezing temperature needed and use 
correct amount of antifreeze. Never exceed 50% 
antifreeze by volume. 

•  Boiler operating pressure must remain below 15 

psi for antifreeze solutions that specify a maximum 
of 250°F (121°C). Otherwise, increase system 
operating/tank pressure to 20 psig.  Note: Refer 
to expansion tank manufacturer instructions for 
adjusting tank pressure.