Part number 550-143-010/1021
46
GV90+
series
2
gas-fired water boiler – boiler manual
Mount concentric termination
1. Mount the termination as shown in
2. Support the concentric vent/air termination at the roof pen-
etration as shown in Figure 57.
• The supports/bracing used must support the termina-
tion assembly to prevent vertical slippage or sideways
movement.
• The clamps used on the outside of the termination pipe
must not cut into the pipe or contain sharp edges that
could cause a crack to form.
The vent and air piping must be securely supported,
and must not rest its weight on the boiler fittings.
DO NOT drill or screw into either the vent pipe
or air pipe. Failure to properly support the vent
and air piping could result in vent piping damage,
resulting in possible severe personal injury, death
or substantial property damage.
When inserting the partially-assembled termina-
tion kit through the roof penetration, wrap plastic
or other protection over the end of the exposed
assembly to prevent debris from entering the pipes.
If the air passages become blocked, the boiler will
not operate. Once the rain cap has been cemented
to the assembly, there is no way to correct the prob-
lem. The assembly would have to be replaced if it
were cut to be removed and cleaned. Altering the
assembly in any way could result in severe personal
injury or death due to toxic flue product emissions.
When using AL294C stainless vent pipe, use the
vent pipe manufacturer’s pipe adapter when con-
necting to the concentric vent attachment.
Do not connect any other appliance to the vent pipe
or multiple boilers to a common vent pipe.
3. After the assembly has been positioned in the roof opening
and all supports have been attached, install a bird screen
(purchased separately if not included with the kit) and rain
cap as follows:
a. Place the bird screen on the end of the inner pipe as in
b. Cement the rain cap in place.
Figure 56
Vertical termination — 3” PVC concentric —
single or multiple boilers
Figure 57
3” PVC concentric termination supports
DIRECT VENT —
Vertical with 3” concentric
(continued)
