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Part number 550-142-054/0411
GV90+ gas-fired water boiler — Boiler Manual
46
DIRECT VENT — Vertical with 3” concentric (continued)
Mount concentric termination
1. Mount the termination as shown in Figure 57, page 46.
2. Support the concentric vent/air termination at the roof penetration
as shown in Figure 57.
• The supports/bracing used must support the termination as-
sembly 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 termination
kit through the roof penetration, wrap plastic or other
protection over the end of the exposed assembly to pre-
vent 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 problem. 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 emis-
sions.
When using AL294C stainless vent pipe, use the vent
pipe manufacturer’s PVC adapter when connecting 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 Fig-
ure 58, page 47.
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