Installation Manual

52 Rinnai I-Series Condensing Boiler Solo Manual
• 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.
CH System Common Components Diagram
SYSTEM
RETURN
Expansion
tank
Pressure Gauge
Backow
Preventer
Fill valve with
pressure gauge
Ball Valve
SYSTEM
SUPPLY
Air Separator
Pressure Relief Valve
(supplied with boiler)
Low Water
Cut O
(if required by
local code)
Boiler Pump
Dirt
Trap
Primary-Secondary
Heang Kit
Common CH Components Connued