Installation Manual

Rinnai I-Series Condensing Boiler Solo Manual 51
Listed below are common components in a
Central Heang system. Refer to the
diagram on the next page.
• Expansion Tank — A properly sized
expansion tank charged to 2 PSI (14 kPa)
below the cold system pressure is
required to limit pressure changes in the
heang system. When replacing an
expansion tank, consult the expansion
tank manufacturer for sizing.
• Air Separator — An air separator is
needed on the central heang supply
side of the system to remove any air
that may be present in the piping.
• Pressure/Temperature Gauge — The
current pressure and temperature will
alternately be displayed on the boiler
control panel. A port for an external
gauge is present in the Primary-
Secondary Heang Kit accessory oered
by Rinnai.
• Pressure Relief Valve (PRV) — A PRV
located directly on the supply side of the
boiler is required. The PRV must be 3/4
in. with at least 30 PSI (207 kPa) and a
maximum of 45 PSI (310 kPa). A 30 PSI
(207 kPa) PRV is supplied with the
boiler. A port for the central heang PRV
is present in the Primary-Secondary
Heang Kit accessory oered by Rinnai.
• Oxygen Eliminaon — The boiler may
only be installed in a pressurized closed-
loop heang system, free of air and
other impuries. If using oxygen
permeable tubing in the central heang
system, a plate heat exchanger is
necessary to isolate the tubing and
boiler.
Plumb the heang supply line to the
heang supply connecon on the
boom of the boiler.
Heang Supply Connecon
Hydraulic separaon with primary/secondary
piping is required when connecng the water
supply (see secon “7.5 Hydraulic
Separaon” for more informaon).
IMPORTANT
Primary/Secondary Piping