Pioneer PHR100-55, Instruction Manual

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5. Install a pressure reducing valve on the cold feed make-up water line, (15 PSI nominal on the system
return). Check temperature and pressure gauge which should read minimum pressure of 12 PSI.
6. Install a circulator as shown in piping details (this section). Make sure the circulator is properly sized for
the system and friction loss.
7. Install an expansion tank on the system supply. Consult manufacturer instructions for specific
information relating to expansion tank installation. Size the expansion tank for the required system
volume and capacity.
8. Install supply air vent to remove air when commissioning the heater.
9. The safety relief valve is supplied with the heater, and must be installed on the top ¾” NPT fitting
marked “T&P”. Pipe the discharge of the safety relief valve to prevent injury in the event of pressure relief.
Discharge 6” above the drain. Provide piping that is the same size as the safety relief valve outlet. Never
block the outlet of safety relief valve.
H. FILL AND PURGE HEATING SYSTEM
•
Attach the hose to either balance or purge hose connector or drain valve and run hose to nearest
drain.
•
Close the other side of the balance and purge valve or the shut off valve after the drain.
•
Open first zone balance and purge or drain valve to let water flow out the hose. If zone valves are
used, open the valves one at a time manually. (NOTE: You should check valve manufacturer
instruction prior to opening valves manually, so as not to damage any valves.)
•
Manually operate fill valve regulator. When water runs out of the hose, while it’s connected to the
balance and purge valve or drain you will see a steady stream of water (without bubbles). Close
balance and purge valve or drain to stop the water from flowing. Disconnect the hose and
connect it to next zone to be purged.
•
Repeat this procedure for additional zones (one at a time).
For installation that incorporates standing iron radiation and systems with manual vents at high points,
follow above section and, starting with the nearest manual air vent, open until water flows out. Then close
vent. Repeat procedure, working your way toward furthest air vent.
NOTE: It may be necessary to install a basket strainer in an older system where larger amounts of
sediment may be present. Annual cleaning of strainer may be necessary.
Upon completion, make sure that the fill valve is in automatic position and each zone balance and purge
or shut off is in an open position and zone valves are set for automatic operation.
Use only inhibited propylene glycol solutions which are FDA RATED AS GRAS and specifically
formulated for hydronic systems. Ethylene glycol is toxic and can attack gaskets and seals used in
hydronic systems.
Glycol in hydronic applications includes inhibitors that prevent it from attacking metallic system
components. Make certain that system fluid is checked for the correct glycol concentration and inhibitor
level.
The glycol solution should be tested at least once a year, or as recommended by the glycol manufacturer.