Installation & Operation Manual
2 General venting
Common venting
Crest boilers may be common vented; however, the following criteria MUST BE followed:
1.Only Crest boilers may be connected to the common vent. DO NOT mix other manufacturer’s appliances or other Lochinvar models.
2.Crest boilers connected to the common vent must all be of the same size.
3.Each Crest boiler must have a Lochinvar supplied flue damper installed (see Table 2D).
4.Only vertical venting may be used when common venting Crest boilers. Sidewall venting is not allowed.
5.Crest boilers in a common vent must be connected and controlled with the integral Crest SMART TOUCH Cascade.
a.The Leader may be controlled through the Crest SMART TOUCH control through BMS (external 0 - 10V signal), ModBus or its own internally calculated set point.
b.The Cascade (Members) must be controlled by the Crest Leader boiler using the efficiency optimized Cascade.
For approved common vent sizing, contact the factory.
WARNING When Crest boilers are common vented, the criteria above MUST BE followed.
Failure to follow all these requirements will result in severe personal injury, death, or substantial property damage.
Table 2D Flue Damper Kits
Flue Damper Kits
Model | Damper Size | Kit Number |
FB1500 | 7" | DRH30000 |
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FB2000 | 8" | DRH30001 |
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FB2500 | 9" | DRH30002 |
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FB3000 | 10" | DRH30003 |
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FB3500 | 10" | DRH30003 |
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