Biasi Riva Combi Installation & Operation Instructions page 22

Wall hung gas boiler for central heating and domestic hot water supply

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9. Venting Cont.

Alternative separate configuration (Exhaust outside & intake inside)

Air Intake Elbow

Air Intake Pipe

Air Intake Collar

This configuration of the twin pipe kit allows discharging the exhaust gasses outside. The air

supply is obtained with an air intake pipe. This allows taking air from the room where the

boiler is installed.

If either an additional 45° or 90° accessory elbow is used then the maximum permissible

length of either pipe must be reduced by 3.0 ft or 5.4 ft respectively.

Note: When utilizing this option, see page 14 for room ventilation details.

Installation:

• Drill holes B & C (on the wall template) through the outside wall that is less than

thick.

• Cut the pipe as necessary so that no more than 6" protrudes from the house.

• Slide the exhaust pipe through the hole.

• Slide one rubber wall trim piece on the pipe from inside and one from outside.

• Attach each collar to the boiler with the gasket and screws provided.

• Insert each elbow into its corresponding collar.

• Connect each pipe to its corresponding elbow.

Exhaust Pipe End Cap

Rubber Wall Trim (2X)

Figure 9.4 (Twin pipe Φ 3.25 in)

Exhaust Pipe

Exhaust Elbow

Exhaust Collar

Test Ports

RIVA COMBI MANUAL - REV B

18"

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