Rinnai RU98i Installation Manual download pdf (Page 12)

Rinnai CVent 12

Venng Guidelines

DO NOT

 Do not install in separate distribuon systems. All

water heaters common vented must be in the

same hot and cold plumbing manifolds and must

not exceed 8 units.

 Do not use PVC, CPVC, ABS or galvanized material

for the exhaust vent. CVent must be used on the

exhaust.

 Do not combine vent components from dierent

manufacturers.

 Vent diameter must not be reduced.

 Do not connect the venng system with an

exisng vent or chimney.

 Do not common vent with the vent pipe of any

other type of water heater or appliance.

 Do not install the water heater in an area of

negave pressure.

 Do not install the water heater, venng, and vent

terminaon(s) in any areas where the air may

contain corrosive compounds.

MUST DO

• The water heater dip switch seng must always

be set to long vent (#1 in set of tan switches set to

OFF).

 This water heater is a direct vent water heater and

therefore is cered and listed with the vent

system. You must use vent components that are

cered and listed with the water heater model.

 The vent system must vent directly to the outside

of the building and use outside air for combuson.

 Avoid dips or sags in horizontal vent runs by

installing supports per the vent manufacturer’s

instrucons.

 Support horizontal vent runs a minimum of every

four feet and all vercal vent runs a minimum of

every six feet.

 Venng should be as direct as possible with a

minimum number of pipe ngs.

 Vent connecons must be rmly pressed together

so that the gaskets form an air ght seal.

 Install an appliance adapter which contains a

check valve onto each water heater. Use only the

check valve specied in this manual. Do not

aempt to build your own system.

 The air intake appliance adapter connected to the

water heater must be secured with one self-

tapping screw.

 Check and clean the header check valve every 12

months according to the maintenance instrucons

in this manual.

 Set the temperature seng on all water heaters

being common vented to the same temperature.

INFORMATION

 Unless recovering a tank, Rinnai recommends

installing an MSB controller when common

venng and where water heaters are in a manifold

system.

 For assembly details, refer to the Ubbink

Installaon and Assembly Instrucons located in

the appendix of this manual.

 Rinnai recommends replacing the check valve

when replacing the water heater.

The Ubbink Polypropylene CVent can be used on both the combustion air and exhaust.

Field supplied PVC material can only be used on the combustion air side and MUST NOT

be used for the exhaust.

WARNING

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Rinnai RU98i Installation Manual Page 12

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