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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.
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 Lead/Lag Cascade
option.
For approved common vent sizing, contact the factory.
When Crest boilers are common vented,
WARNING
the criteria above MUST BE followed.
Failure to follow all these requirements
will result in severe personal injury, death,
or substantial property damage.
18
Installation & Operation Manual
Table 2D Flue Damper Kits
Flue Damper Kits
Model
Damper Size
FB1500
7"
FB2000
8"
FB2500
9"
FB3000
10"
FB3500
10"
FB4000
12"
FB5000
14"
Kit Number
DRH30000
DRH30001
DRH30002
DRH30003
DRH30003
DRH30004
DRH30005
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