Crown Boiler MWC116ENL - Manual (Page 53)

51
XII Start-up and Checkout
Use the following procedure for initial start-up of the boiler:
If not already done, fl ush the system to remove sediment and debris. 1) This should be done with the boiler
isolated from the system.
Fill the boiler and hydronic system with water and purge the system of air. To do this: 2)
Unscrew the cap on the automatic air vent by one turn and leave open permanently. This air vent is a)
located on top of the circulator (Figure 12.1).
Open the fi ll valve and pressurize the boiler to approximately 15psi
b)
Bleed air out of each manual air vent in the system until a steady stream of water appears. Start with c)
the lowest manual vents in the system and work towards the highest. If a manual fi ll valve is used,
periodically add water to the system so that the pressure at the boiler is maintained at approximately
15 psi.
Remove the shaft cover screw on the front of the circulator (Figure 12.2). Using a screw driver,
d)
manually spin the shaft in the direction of rotation shown on the pump until a small amount of water
appears at the end of the shaft. Replace the shaft cover screw.
At the end of the purging process, make sure that the pressure gauge on the boiler reads between 5
e)
and 19 psi.
Make sure that a manual air vents are closed. If an automatic fi ll valve is used, make sure that it is set
f)
to the automatic position.
Auto Air
Vent Cap
Figure 12.1: Location of Automatic Air Vent Cap
WARNING
Never attempt to fi ll a hot empty boiler
NOTE
Safe lighting and other performance criteria were met with the gas train assembly provided
on the boiler when the boiler underwent the tests specifi ed in Z21.13.