Pvc/Cpvc; Common Venting - Lochinvar FTxl 400 Installation & Operation Manual

3
General venting

Common venting

FTXL boilers may be common vented; however, the following
criteria MUST BE followed:
1. Only FTXL boilers may be connected to the common
vent. DO NOT mix other manufacturer's appliances or
other Lochinvar models.
2. FTXL boilers connected to the common vent must all be
of the same size.
3. Each FTXL boiler must have a Lochinvar supplied fl ue
damper installed (see Table 3D).
4. Only vertical direct vent, positive pressure, Category
IV or vertical/chimney vent, negative pressure, Category
II may be used when common venting FTXL boilers.
Sidewall common venting is not allowed.
5. FTXL boilers in a common vent must be connected and
controlled with the integral FTXL SMART SYSTEM
Cascade.
a. The Leader may be controlled through the FTXL
SMART SYSTEM control through BMS (external
0 - 10V signal), ModBus, BACnet, or its own internally
calculated set point.
b. The Cascade (Members) must be controlled by the
FTXL Leader boiler using the Lead/Lag Cascade
option.
For approved common vent sizing, contact the factory.
When FTXL 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.
When FTXL boilers are common vented,
NOTICE
hot water generators must be piped to the
primary heating loop and tank thermostats
must not be connected to the FTXL.
20
Installation & Operation Manual
Table 3D Flue Damper Kits
Flue Damper Kits
Model Damper Size
400 4"
500 4"
600 4"
725 6"
850 6"

PVC/CPVC

This product has been approved for use with the PVC/CPVC
vent materials listed in Table 3E on page 21.
Installing vent and air piping
WARNING The vent connection to the appliance must
be made with the starter CPVC pipe section
provided with the appliance if PVC/CPVC
vent is to be used. The fi eld provided
vent fi ttings must be cemented to the
CPVC pipe section using an "All Purpose
Cement" suitable for PVC and CPVC pipe.
Use only the vent materials, primer, and
cement specifi ed in Table 3E to make
the vent connections. Failure to follow
this warning could result in fi re, personal
injury, or death.
Use only cleaners, primers, and solvents
NOTICE
that are approved for the materials which
are joined together.
All PVC vent pipes must be glued, properly
NOTICE
supported, and the exhaust must be
pitched a minimum of a 1/4 inch per foot
back to the boiler (to allow drainage of
condensate).
Insulation should not be used on PVC
WARNING
or CPVC venting materials. The use of
insulation will cause increased vent wall
temperatures, which could result in vent
pipe failure.
Kit Number
DRH30006
DRH30006
DRH30006
DRH30007
DRH30007