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Figure 5: Recommended Water Piping for Zone Valve Zoned Heating Systems
D. Install Drain Valve in return piping. See Figure 5.
E. Oil, grease, and other foreign materials which
accumulate in new hot water boilers and a new or
reworked system should be boiled out, and then
thoroughly ushed. A qualied water treatment
chemical specialist should be consulted for
recommendations regarding appropriate chemical
compounds and concentrations which are compatible
with local environmental regulations.
F. After the boiler and system have been cleaned and
ushed, and before relling the entire system add
appropriate water treatment chemicals, if necessary, to
bring the pH between 7 and 11.
G. 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
5).
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 ve gallon bucket at a suitable
oor drain or outdoor area).
4. Starting with one circuit, open zone valve.
5. Open hose bib.
6. Open ll valve (Make-up water line should be
located directly above isolation valve in boiler
supply piping).
7. Allow water to overow 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 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 lling the system until
the pressure gauge reads 12 psi. Close ll valve.
(Note - If make-up water line is equipped with
pressure reducing valve, system will automatically
ll to 12 psi.
10. Open isolation valve in boiler supply piping.
11. Remove hose from hose bib.