Utica Boilers UB90-200 Installationsanweisungen

• Determine required system fill pressure, design 

temperature, and water content. 

• Boiler contains 2.6 gallons (U.S.). Size expansion tank 

accordingly. Consult expansion tank manufacturer for 

proper sizing information. 

• Connect properly sized expansion tank (not furnished) 

See Figure 3, for diaphragm type expansion tank. 

For diaphragm type expansion tanks, adjust tank air 

pressure to match system fill pressure. 

• Install air vent (furnished) as shown for diaphragm type 

expansion tank system only. 

• Install make-up water connections as shown and per 

local codes. 

• If pressure reducing valve is used, adjust to match 

system fill pressure. Verify clean water supply is 

available when  connecting cold make-up water supply 

to boiler. When water supply is from well or pump, 

install sand strainer at pump.

Burn and scald hazard.  Safety relief valve could       

discharge steam or hot water during operation.       

Install discharge piping per these instructions.

     

Safety Relief Valve / Temperature Pressure Gauge
Boiler is furnished with safety relief valve and temperature 

pressure gauge.

• Install safety relief valve using pipe fittings provided 

with boiler. Figure 2.

• Install safety relief valve with spindle in vertical position.

• Do not install shutoff valve between boiler and safety 

relief valve.

• Install discharge piping from safety relief valve. 

A.  Use ¾” or larger pipe.
B.  Use pipe suitable for temperatures of 375°F 

(191°C) or greater.

C.  Individual boiler discharge piping shall be 

independent of other discharge piping.

D.  Size and arrange discharge piping to avoid 

reducing safety relief valve relieving capacity below 

minimum relief valve capacity stated on rating 

plate.

E.  Run pipe as short and straight as possible to 

location protecting user from scalding and properly 

drain piping.

F.  Install union, if used, close to safety relief valve 

outlet.

G.  Install elbow(s), if used, close to safety relief valve 

outlet and downstream of union (if used).

H.  Terminate pipe with plain end (not threaded).

Check local codes 

for maximum 

distance from 

floor or other 

allowable safe 

point of discharge