Installation & Operation Manual
18
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 direct vent, positive pressure, Category
IV or vertical/chimney vent, negative pressure, Category
II 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.
• 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.
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
FB2000 8" DRH30001
FB2500 9" DRH30002
FB3000 10" DRH30003
FB3500 10" DRH30003
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