Install Instructions

10
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F
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SUPPLYRETURN
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SUPPLYRETURN
1. Turn the Lever Handles on both
Hydro-Core ball valves so that they
are parallel to the  ange. The T-Flow
handle logo indicates the  ow pattern
inside the valve. The logo should
indicate that  ow can go through the
purging valve and both the supply
and return piped assemblies.
2. Remove both purging valve caps
3. Using a hose, connect a water source
to the system return purging valve
(located above the  ange connection).
4. Connect a hose to the system
supply purging valve for drainage.
5. Turn the drain handles on both the
system return & system supply
purging valves into the open position
(drain handles parallel with the  ange).
6. Turn on the water source and
allow water to  ow into the
circulator from the hose.
7. Allow water to run until all excess
air has been purged from the boiler
and the water coming from the
drainage hose appears clear. If
needed, turn on the circulator pump
to force water through the system.
8. Once the air has been purged out
and the drainage runs clear, turn
off the circulator, close the two
purging valves, remove the hoses,
and replace the drain caps.
9. The boiler and NBP loop will now
be  lled with clean fresh water. If a
glycol solution is preferred, see steps
2–14 on the next page and follow
the instructions for “Descaling the
Boiler Heat Exchanger” utilizing glycol
rather than a descaling solution.
10. Return the lever handled ball valves
to their normal operating position
(handles perpendicular to the  ange).
Filling/Power Purging
The Hydro-Core and associated NBP offers several bene cial features for a system’s startup and future maintenance.
At startup the boiler can be isolated from the remaining hydronic system and the trapped air in the boiler and associated
piping can be power purged out.
To Power Purge and/or  ll the boiler the following is needed:
• Two hoses w/ 3⁄4" hose thread connection
• A water source
• Power to the circulator pump in the NBP Loop
• 5 gallon bucket (for glycol  lling only)