Utica Boilers UB90-200 Installationsanweisungen

Water treatment and antifreeze protection must be applied 

to all aluminum series high efficiency gas-fired boilers 

using antifreeze protection.
Clean System First

• Before connecting boiler to heating system, clean 

and flush system thoroughly. Verify system is free of 

sediment, flux and residual boiler water additives.

• Systems having antifreeze not recommended must be 

completely flushed to ensure no old antifreeze remains. 

In older systems obviously discolored, murky or dirty 

water; or pH reading outside acceptable range (between 

7.0 and 8.0) are indications system should be cleaned 

or treated. Thoroughly flush system with clean water to 

remove sediment or contaminants. Sludge and iron oxide 

deposits can cause rapid breakdown of inhibitors.

• Flush with clean water. If chemical cleaners are used, 

use only those recommended for use with aluminum 

boilers. Follow chemical cleaner manufacturer’s 

instructions completely.

• DO NOT mix different manufacturer’s products.

Verify water used to fill system meets these requirements:

• System fluid pH maintained between 7.0 and 8.0. 

• Maintain water hardness below 7 grains hardness. 

• Filling with chlorinated potable water is acceptable. DO 

NOT fill boiler with water containing chlorine in excess 

of 100 ppm.

• DO NOT use inhibitors or other additives that are not listed.

• Consult local water treatment specialist for 

recommendations if any of above requirements is 

outside stated ranges.

• Continuous addition of make-up water will constantly 

add oxygen to system. Eliminate all system leaks. All 

system leaks must be repaired immediately. 

• Verify expansion tank is operational and properly sized. 

Undersized expansion tanks cause relief valve weeping 

and substantial make-up water addition.

• Operation of this boiler in a system containing 

significant amounts of dissolved oxygen can cause 

severe heat exchanger corrosion damage.

• This boiler is not designed for use in systems 

containing regular additions of make-up water. Regular 

additions of make-up water may cause severe heat 

exchanger damage.  System leaks may not always be 

visible. Unseen system leak will become obvious if boiler 

pressure decreases when make-up valve is closed. 

• This boiler is designed for closed loop hydronic heat 

system only.

Boiler is not suitable for natural gravity 

type installations, or any other open type system.

• Use only antifreeze products recommended for use with 

aluminum boilers.  See Table 5 page 14.

• 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 must be of type as listed in this manual due 

to their operational characteristics of : type 356 T6 

aluminum at operating temperatures between 20°F 

(-6.7°C) and 250°F (121°C).

• Always clean system prior to using antifreeze.

• Follow antifreeze manufacturer’s instructions for 

use, safe handling and storage. Refer to MSDS 

(Material Safety Data Sheets) provided by antifreeze 

manufacturer for potential hazards and first 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 

pH within recommended level. Follow antifreeze 

manufacturer’s instructions to adjust pH. 

• If system leaked, adjust water and antifreeze 

chemistry. To avoid damage to boiler, check pH 

and chemistry of boiler solution. Consult antifreeze 

manufacturer for recommendations. 

• Take pH reading annually, and adjust 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 

specific 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 maximum of 

250°F (121°C). Otherwise, increase system operating/

tank pressure to 20 psig. Refer to expansion tank 

manufacturer instructions for adjusting tank 

pressure.

Fire, explosion, asphyxiation hazard. Inadequate 

dielectric isolation, incorrect water treatment or 

antifreeze application may cause damage to boilers 

heat exchanger. Improper installation could result 

in death or serious injury.  Follow these instructions 

completely.