Hot Water Supply; Domestic Water Quality; Domestic Water Treatment Accessory - Rinnai E75CN Installation & Servicing Instructions Manual

6.5
!
DANGER
Identifi cation colors fl ow
regulators:
E75C: White
E110C: Green
i
NOTICE
6.5.1
i
NOTICE
6.5.2
28

Hot water supply

Connection of the drinking water installation should be performed according to the
national secondary drinking water regulations.
Do NOT use toxic chemicals, such as those 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 equipped 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).
The 3/4" NPT adapter fi tting with fl ow reducing valve must be fi tted in the cold water
connection.
A fl ow regulator valve is supplied with the boiler in a 3/4"NPT adapter fi tting. 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.
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.

Domestic Water quality

Appropriate steps must be taken to ensure the brazed plate heat exchanger does
not become plugged by scale caused by hard water or sediment. If the plate heat
exchanger becomes plugged by either scaling from hard water or sediment it is not
the responsibility of Rinnai.
1. Water hardness for DHW
When there is a water hardness of more than 6 to 7 grains hardness for domestic
water, a water softener must be installed on the inlet side of the DHW connection.
2. Sediment in DHW
If there is sediment in your domestic water supply a sediment fi lter or other suitable
device should be used to remove it before the water enters the brazed plate heat
exchanger.
3. Water Chemistry for DHW
The water used for domestic must have a water pH between 6.0 and 8.0, contain less
than 1.7 gpg (20 mg/l) of Sodium, and a concentration of Chlorine less than 5.8 gpg
(100 mg/L).
If problems occur when using sanitary water outside of the above stated
requirements, no recourse can be made to the terms of the limited warranty.

Domestic water treatment Accessory

Rinnai offers a domestic water treatment device that can help reduce scale build up.
This device can be installed on the incoming cold water line for any combi boiler. For
additional information on contact Rinnai.