Connecting The Boiler; Central Heating System - Rinnai E75CN Installation & Servicing Instructions Manual

6

Connecting the boiler

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6.1 Central heating system

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The boiler has the following connection pipes;
- The central heating circuit pipes.
These must connected to the plumbing kit by means of adapter fi ttings.
See further chapter 6.1;
- The gas supply pipe.
It is provided with a 3/4" male thread into which the tail piece of the gas valve can
be screwed. See further chapter 6.4;
Cold and hot water pipes for domestic hot water (DHW).
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These consist of 3/4" (15 mm) copper pipe and can be connected to the installation
by means of 3/4" M-NPT adapter fi ttings. See further chapter 6.5;
- The condensation drain pipe.
It consists of an oval 1" (22 mm) plastic pipe. The drain pipe can be connected to
this by means of an open connection. If the open connection is fi tted in a different
location, then the pipe can be lengthened by means of a 1 1/4" (32 mm) PVC
sleeve. See further chapter 6.6;
- The vent system and air supply system.
It consists of a concentric connection 3"/5" (80/125 mm). The boiler can be converted
to a twin pipe connection that will accept 80mm fl ue and intake air or with the use
of the included adapters 3" PVC/CPVC fl ue and intake. See further chapter 6.7.
The pipes to be connected to the boiler must be cleaned before connecting in
order to prevent dirt from entering and damaging the boiler.
Connect the central heating system according to its instructions.
The boiler pipes can be connected to the installation by means of compression fi ttings.
Reducers should be used for connecting to thick-walled pipe (welded or threaded).
When removing the plastic sealing caps from the pipes, dirty testing water
may drain from the boiler.
A Plumbing Kit must be fi tted to the boiler.
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 fl ow control valves or other automatic
means to prevent gravity circulation of the boiler water during the cooling
cycle.