9. Venting
The Riva is a mechanical draft, side wall vented boiler. There are two flue options available - separate and coaxial. The coaxial option has one configuration shown on the next page. The separate option has two possible configurations shown on the following pages.
9.1 Restrictor Sizing:
Each exhaust option is shipped standard with 3 feet of exhaust pipe, 3 feet of intake air pipe. There is also a restrictor kit in which there are some restrictors that must be placed in exhaust breech of fan on the top of the boiler (Fig. 9.1) according to the flue configuration used.
If additional flue piping is need for a particular application, it can be ordered separately in 3 feet increments. Depending on the final flue pipe length, an alternative restrictor may be required. Refer to the tables 9.1 for proper restrictor ring sizing
Coaxial 2.5/4.0 | Restrictor Size |
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From 1.65 to 3.30 (ft) | 41 |
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From 3.30 to 8.86 (ft) | 44 |
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Separate 3.25/3.25 | Restrictor Size |
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For 1.65 (in) and 1.65 (out) | 38 |
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From 3.30 to 39.40 (in+out) | 41 |
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Figura 9.1 | Table 9.1 |
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| 9.2 Fitting the flue system: |
In general, it has to be taken in consideration that the orizontal sections of the flue pipe must have an horizontal sloping not less than 1.5 degree (0.3 in per ft) towards the boiler.
In the standard horizontal flue kit the flue pipe is angled within the air duct therefore the air duct must be horizontally installed.
If one or more exstensions have to be used they must be adequately supported so that there is no sag in the flue pipe and a minimum fall of 1.5 degree (0.3 in per ft) over the whole lenght towards the boiler is ensured.
RIVA HEAT ONLY MANUAL - REV A | 17 |