Rinnai M Series, Installation And Operation Manual

Page: 50 / 122

50 Rinnai M - Series Condensing Boiler Combi Manual
•
Purge the heating system to remove all
debris and air. Debris and air in the lines
will damage the boiler.
•
When removing the plastic sealing caps
from the boiler connections, water may
come out of the boiler due to live fire
testing during manufacturing.
•
The boiler, when used in connection with
a refrigeration system, must be installed
so the chilled medium is piped in parallel
with the boiler with appropriate valves
to prevent the chilled medium from
entering the boiler.
•
The boiler piping system of a hot water
boiler connected to heating coils located
in air handling units where they may be
exposed to refrigerated air circulation
must be equipped with flow control
valves or other automatic means to
prevent gravity circulation of the boiler
water during the cooling cycle.
•
Some installations with multiple zone
valves may require a differential bypass,
which will prevent excessively high flow
rates through a single zone when the
other zone valves are closed.
To connect the water supply, follow the
instructions below.
For standard installations, refer to the “ Piping
Diagram for Basic Central Heating
Installation
” in this chapter.
Attach the 3/4 in. FNPT x 1 in. MNPT
connection fitting to the supply and
return heating fittings on the bottom of
the boiler.
Topics in this section
•
Guidelines
•
Instructions
•
Common CH Components
•
Piping Diagram for a Basic CH System
(With Hydraulic Separation)
•
Hydraulic Separation
•
Connect the Pressure Relief Valves
(DHW and CH)
•
Connect the Condensate Drain Line
8
The boiler may not be installed directly to
a heating system where polybutylene or
other oxygen permeable piping is used.
Water connections to the boiler should
follow all state and local plumbing codes.
IMPORTANT
•
It is required to include an air separator
on the central heating supply of the
system.
•
System piping should be insulated when
freezing is a potential concern.
•
All piping must comply with local, state,
national or ASME code as appropriate.
CAUTION
Supply and Return Fitting Connections