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Part number 550-142-054/0411
GV90+ gas-fired water boiler — Boiler Manual
52
DIRECT EXHAUST — Sidewall (continued)
Figure 62 DIRECT EXHAUST — Sidewall — termination assembly
and termination options — all parts by installer except
where shown otherwise
b. Provide metal cover plates (item 2, Figure 62).
The outer plate MUST provide a stop to prevent
the vent elbow from being pushed inward. (See
NOTICE at right.) Hole diameters in the metal
plates must be 3
5
⁄8” for PVC pipe. For AL29-
4C vent pipe and coupling (or elbow) — size
hole large enough to clear vent pipe, but small
enough to prevent the coupling (or elbow) from
being pushed through.
The Weil-McLain sidewall termination kit
supplied with each boiler includes metal
plates with two openings. These plates can
be trimmed and used for direct exhaust
vent termination cover plates when the
vent diameter used matches the hole size
in the plates provided with the boiler.
c. Insert the galvanized metal thimble (by install-
er) in the vent pipe hole as shown in Figure 62.
2. Follow all local codes for isolation of vent pipe when
passing through floors or walls.
Termination and fittings
1. If using a coupling or elbow for the termina-
tion, prepare the vent termination fitting (Fig-
ure 62, page 52) by inserting a bird screen. Bird
screens are not supplied with the GV90+ boiler.
Purchase separately from Weil-McLain.
2. You can install the vent termination using either
of the configurations shown in Figure 61, page 51.
3. Maintain the required dimensions of the finished
termination piping as shown in Figure 61, page 51.
4. Do not extend exposed vent pipe outside of the
building more than shown in this document. Con-
densate could freeze and block vent pipe.
LEGEND for Figure 62
1 Vent piping
2 Cover plates
3 Galvanized thimble
4 Vent termination elbow
5 Bird screen
6 Extend vent pipe through outside plate enough to attach
termination coupling (or elbow when snorkeled).
7 Snorkel option (to elevate vent termination) — requires bird
screen
8 Coupling option — requires bird screen
9 Weil-McLain termination plate option (plate is supplied with
boiler) — bird screen not required