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VIII. System Start-up
A. Safe operation and other performance criteria were
met with gas manifold and control assembly provided
on boiler when boiler underwent tests specifi ed in
American National Standard for Gas-Fired Low-
Pressure Steam and Hot Water Boilers, ANSI Z21.13.
B. FILL ENTIRE HEATING SYSTEM WITH WATER
and vent air from system. Use the following procedure
on a Series Loop System equipped with zone valves.
(See Figure 4).
1. Close isolation valve in boiler supply piping.
2. Isolate all circuits by closing zone valves or
balancing valves.
3. Attach a hose to hose bib located just below
isolation valve in boiler supply piping. (Note -
Terminate hose in fi ve gallon bucket or at a suitable
fl oor drain or outdoor area).
4. Starting with one circuit, open zone valve.
5. Open hose bib.
6. Open manual fi ll valve (Make-up water line should
be located directly above isolation valve in boiler
supply piping).
7. Allow water to overfl ow from bucket until discharge
from hose is bubble free for 30 seconds.
8. Open zone valve to the second zone to be purged,
then close the fi rst. Repeat this step until all zones
have been purged, but always have one zone open.
At completion, open all zone valves.
9. Close hose bib, continue fi lling the system until the
pressure gauge reads between 12 and 15 psi. Close
fi ll valve.

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10. Open isolation valve in boiler supply piping.
11. Remove hose from hose bib.
C. Prepare to check operation.
1. Obtain gas heating value (in BTU per cubic foot)
from gas supplier.
2. Connect manometer to pressure tap on gas valve.
Use 1/8 NPT tapping provided.
3. Temporarily turn off all other gas-fi red appliances.
Figure 21: Sequence of Operation