Rinnai M060C Installation And Operation Manual page 51

Plumb the heating supply and return
lines to the heating supply connection
on the bottom of the boiler. It is
required to use primary/secondary
piping to the heating system.
Heating Supply and Return Connection
Boiler with Primary Secondary Heating Kit
Listed below are common components in a
Central Heating 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 heating
system. When replacing an expansion tank,
consult the expansion tank manufacturer
for sizing.
•
Air Separator — An air separator is needed
on the central heating supply side of the
system to remove any air that may be
present in the piping.
•
Water Fill Valve — Maintains proper water
pressure in the central heating circuit.
Rinnai M-Series Condensing Boiler Combi Manual
•
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 Heating Kit accessory offered
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 heating PRV is
present in the Primary-Secondary Heating
Kit accessory offered by Rinnai.
•
Oxygen Elimination — The boiler may
only be installed in a pressurized closed-
loop heating system, free of air and other
impurities. If using oxygen permeable
tubing in the central heating system, a
plate heat exchanger is necessary to
isolate the tubing and boiler.
•
Low Water Cut Off (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 an external
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.
•
Back Flow Preventer — Use a back flow
preventer in the filling circuit to the
appliance as required by local code.
•
Dirt Trap — Protects the boiler from
debris in the plumbing system.
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