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NOTES:
•
Primary/Secondary piping must be used (closely spaced tees or low loss header).
•
All closely spaced tees shall be within 4 pipe diameters center to center spacing.
•
The minimum boiler piping must be at least 1-1/4 inch. Do not downsize boiler heating loop.
•
It is recommended to use check valve to prevent reverse flow and/or gravity circulation when
pump is in off-cycle.
•
Boiler pump must be properly sized to ensure proper flow rate through the boiler and related
piping (minimum flow rate must be maintained to prevent short cycling)
•
System flow rate should always be greater than boiler primary loop flow rate when the boiler is
in operation to prevent short cycling.
Figure 48
IMPORTANT
When pumps with amperage draw more than 2 Amps are connected to the boiler terminal a
RIB relay must be used.
This is not an engineering drawing; it is intended only as a guide and not as a replacement for professional engineering project drawings.
This drawing is not intended to describe a complete system. It is up to the contractor or engineer to determine the necessary components
and configuration of the particular system to be installed. The drawing does not imply compliance with local building code requirements. It
is the responsibility of the contractor or engineer to ensure the installation is in accordance with all local building codes. Confer with local
building officials before installation.
Rinnai Commercial Boiler Installation and Operation Manual
RIB Relay/SPST
Relay for Pump
> 2A
55
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