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Installation & Servicing Instructions Rinnai Q-Series

6.5 Hot water supply (Combi boiler Q175CN/Q175CP)

Connection of the drinking water installation should be performed according to the

national secondary drinking water regulations.

Do NOT use toxic chemicals, such as are used for boiler treatment in potable

water heating systems used for space heating.

The sanitary water pipes can be connected to the installation by use of adapter

ﬁ ttings. The cold water inlet on the Combi boilers must be equiped with the following

components (counted in the water ﬂ ow direction):

Flow regulator valve (supplied), Safety group, Expansion vessel 87 PSI / 6bar (potable

water, blue).

A ﬂ ow regulator valve is supplied with the boiler. The ﬂ ow regulator valve ensures that

a quantity of water is supplied which has a outlet temperature of 120°F (assuming a

cold water temperature of 45°F). The quantity of water is virtually unaffected by the

water pressure. The 3/4" NPT adapter ﬁ tting with the ﬂ ow reducing valve must be

ﬁ tted in the cold water connection (see Dimensions 5.3, cold water pipe -k).

When there is a water pressure lower than 22PSI / 1.5 bar it is advisable to

remove the inside mechanism of the ﬂ ow reducing valve. Contact Rinnai for

removal instructions.

6.6 Condensate drain pipe

This boiler produces condensate. Condensate must be drained otherwise the boiler

will not function and can cause property damage.

The condensation drain pipe should be connected to a drain in the building by means

of an open connection. By this means the possibility of drain gases effecting the boiler

is prevented. The drain connection should have a minimum diameter of 1.3" / 32mm.

Install the condensation drain pipe according to the applicable rules and regulations.

If the condensate outlet of the boiler is lower than the public sewage system a

condensate pump must be used.

The condensate produced by the boiler has a pH value between 3 and 4.

Install a neutralization unit if required by the local code. It is recommended, but not

required to install a condensate neutralizer.

Do not drain the condensation water to the external rain gutter because of

the danger of freezing and blockage of the drain.

Before putting the boiler into operation ﬁ ll the condensate trap with 1.27

cups / 300 ml of water.

If the boiler will be installed in a high temperature

installation such as baseboard, ﬁ ll the condensate trap with mineral oil

instead of water.

Use materials approved by the authority having jurisdiction. In absence of such

authority, PVC and CPVC pipe must comply with ASTM D1785, F441 or D2665.

Cement and primer must comply with ASTM D2564 or F493.

For Canada, use CSA or ULC certiﬁ ed PVC or CPVC pipe, ﬁ ttings and cement.

Periodic cleaning of the condensate disposal system must be carried out.

See the Rinnai Boiler Applications Manual for further information and a piping

diagram for the condensate.

NOTICE

DANGER

NOTICE