Crestron electronic 3 Manuale Utente

        

Installation & Operation Manual

Do not use petroleum-based cleaning or 
sealing compounds in the boiler system.  
Damage to elastomer seals and gaskets 
in the system could occur, resulting in 
substantial property damage.

1.  Consult local water treatment companies for hard water 

areas (above 7 grains hardness).

1.  Do not fill boiler or operate with water containing 

chlorine in excess of 200 ppm.

2.  Filling with chlorinated fresh water should be acceptable 

since drinking water chlorine levels are much lower.

3.  Do not use the boiler to directly heat swimming pool or 

spa water.

1.  For systems using freeze protection fluids, follow fluid 

manufacturer’s instructions.

2.  Freeze protection fluid must be replaced periodically due 

to degradation of inhibitors over time.  Follow all fluid 
manufacturer’s instructions.

1.  Determine freeze protection fluid quantity using 

system water content, following fluid manufacturer’s 
instructions.  Boiler water content is listed on page 6.  
Remember to include expansion tank water content.

2.  Local codes may require a backflow preventer or actual 

disconnect from city water supply.

3.  When using freeze protection fluid with automatic fill, 

install a water meter to monitor water makeup.  Freeze 
protection fluid may leak before the water begins to 
leak, causing concentration to drop, reducing the freeze 
protection level.

1.  Fill system only after ensuring the water meets the 

requirements of this manual.

2.  Close manual and automatic air vents and boiler drain 

valve.

3.  Fill to correct system pressure.  Correct pressure will vary 

with each application.

 

a.  The minimum cold water fill pressure for a 
  

commercial system is 12 psi (82.7 kPa).

 

b.  Pressure will rise when boiler is turned on and 
  

system water temperature increases.  

Eliminate all system leaks. Continual 
fresh makeup water will reduce boiler 
life. Minerals can build up in the heat 
exchanger, reducing heat transfer, 
overheating the heat exchanger, and 
causing heat exchanger failure.

1.  Purge air from system:

2.  Open automatic air vent (diaphragm-type or bladder-

type expansion tank systems only) one turn.

3. Open 

other 

vents:

 

a.  Starting on the lowest floor, open air vents one at a 
  

time until water squirts out.

 

b.  Repeat with remaining vents.

4. Refill 

to 

correct 

pressure.

4.  At initial fill and during boiler startup and testing, check 

system thoroughly for any leaks.  Repair all leaks before 
proceeding further.

 WARNING

 CAUTION