Installation Guide

Installation & Servicing Instructions Rinnai Q-Series

6 Connecting the boiler

The boiler has the following connection pipes;

- The central heating circuit pipes.

These must be 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;

- The condensation drain pipe.

It consists of an oval 1" (24 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.

- Cold and hot water pipes for domestic hot water (DHW).

Combi boilers only: 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 pipes to be connected to the boiler must be cleaned before connecting in

order to prevent dirt from entering and damaging the boiler.

6.1 Central heating system

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.

NOTICE