Riverside Hydronics 1000 WBX 125A-IFC, Installation & Maintenance Manual, Page: 9 / 42

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4.6 Clearances To Combustible Surfaces
Minimum 1” clearance must be provided from any vent surface to adjacent combustible material. The minimum
clearances to unprotected combustible material are 24” be provided at the front, 8” be provided at the rear and 8” at
top, left and right sides of the appliance.
5 GENERAL PIPING GUIDELINES
Consult factory for piping of hybrid boiler systems that contain both condensing and non-condensing boilers.
5.1 Inlet and Outlet Connections
The connection to the unit marked “Inlet” on the header connects to the return from the system (water to be heated).
The connection on the header marked “Outlet” connects to the supply side of the system (hot water out of the unit).
5.2 Supply and Return Piping (For Non-hybrid Boiler System)
Note: For motorized isolation valves on each boiler’s inlet piping:

In constant flow building loops, motorized isolation valves must NOT be used.

In buildings with variable flow pumping systems on the boiler loop, motorized isolation valves may be
recommended. Building flow may have to be limited to only the firing boilers during periods of low building heat
demand to prevent temperature from reaching the boiler’s operating limit.

It is recommended that the OnTrac multiple boiler control be used to control these valves. Consult your Riverside
Hydronics representative for design assistance.
5.3 Condensate Drain, Trap & Disposal
The Centauri
®
boiler is designed to produce significant amounts of condensate because of its high efficiency.
Condensate occurs naturally when water vapor in combustion gases is cooled below the dew point. A 3/4” NPT drain
connection is provided. A trap with three inches of standing water below the bottom of the heater (3” above the base
of the I-Beam skids), and no higher than the bottom of the heater must be field installed as part of the condensate
piping.
WARNING: A trap with three inches of standing water as described in these instructions must be included as part
of the condensate piping system. This trap is required to keep hazardous products of combustion from
continually entering the room through the condensate piping. Failure to provide this trap can cause, personal
injury, exposure to hazardous materials or loss of life.