I Series Solo Installation Manual

51
Rinnai I-Series Condensing Boiler Solo Manual
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.
Plumb the heang supply line to the
heang supply connecon on the
boom of the boiler.
 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.
 Low Water Cut O (LWCO) — This
boiler has a factory-installed pressure
sensor type LWCO. The boiler's internal
LWCO is not serviceable or adjustable.
Check your local codes to determine if
a LWCO is required and if this device
conforms to the local code. If a LWCO is
required to be installed, the probe
must be located higher than the
minimum safe water level. When a
LWCO is installed, it must be wired
back to the appropriate terminal on the
boiler PC Board.
 Water Fill Valve — Maintains proper
water pressure in the central heang
circuit.
 Back Flow Preventer — Use a back
ow preventer in the lling circuit to
the appliance as required by local code.
 Dirt Trap — Protects the boiler from
debris in the plumbing system.
Heang Supply Connecon