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Use the following steps to correctly size vent pipe diameter.
Refer to Vent Pipe Size Determination Worksheet on
page 52.
1 − Determine the vent termination and its corresponding
equivalent meter value per table 6.
2 − Determine the number of 90° elbows required for both
indoor and outdoor use. Calculate the corresponding
equivalent meters of vent pipe.
3 − Determine the number of 45° elbows required for both
indoor and outdoor use. Calculate the corresponding
equivalent meters of vent pipe.
4 − Determine the length of straight pipe required.
5 − Add the total equivalent meters calculated in steps 1
through 4 and compare that length to the maximum
values given in table 6 for the proposed vent pipe di-
ameter. If the total equivalent length required exceeds
the maximum equivalent length listed in the appropri-
ate table, evaluate the next larger size pipe.
TABLE 5
MINIMUM VENT PIPE LENGTHS
G61MPVT
MIN. EQUIV.
MODEL
VENT LENGTH
070, 090
110***
4.5m*
135***
*Any approved termination may be added to the minimum equivalent length
listed.
**G61MPVT−60C−110 and G61MPVT−60D−135 must have 90° street ell (sup-
plied) installed directly into unit flue colla and 50mm to 80mm reducer (sup-
plied) must be installed on the 50mm ell.
NOTE − All 90° elbows used in configuration of vent, must be sweep el-
bows.
TABLE 6
MAXIMUM VENT PIPE LENGTHS
G61MPVT
ALTITUDE
MODEL
070
090
0 − 610m
110*
135*
070
090
611 −1372m
110*
135*
n/a −− Not allowed.
*G61MPVT−60C−110 and G61MPVT−60D−135 must have 90° street ell (sup-
plied) installed directly into unit flue colla and 50mm to 80mm reducer (sup-
plied) must be installed on the 50mm ell.
NOTE − All 90° elbows used in configuration of vent, must be sweep el-
bows.
EXAMPLE
1.5m plus 2 elbows of 50mm or
80mm diameter pipe
1.5m plus 2 elbows of 80mm
diameter pipe
1.5m plus 2 elbows of 80mm
diameter pipe
MAXIMUM EQUIVALENT VENT
LENGTH METERS
50mm
80mm
100mm
dia.
dia.
dia.
12.2
16.1
44
4.5
12.2
34.5
n/a
12.2
30
n/a
7.6
20
7.6
10
27.5
n/a
7.6
21.5
n/a
7.6
18.7
n/a
n/a
n/a
IMPORTANT
The G61MPVT unit is not suitable for use at eleva-
tions over 610m.
Joint Cementing Procedure
All cementing of joints should be done according to the
relevant local authority.
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system
check. Allow fumes to dissipate for at least 5 minutes
before placing unit into operation.
1 − Measure and cut vent pipe to desired length.
2 − Debur and chamfer end of pipe, removing any ridges
or rough edges. If end is not chamfered, edge of pipe
may remove cement from fitting socket and result in a
leaking joint.
3 − Clean and dry surfaces to be joined.
4 − Test fit joint and mark depth of fitting on outside of pipe.
5 − Uniformly apply liberal coat of PVC primer for PVC or
ABS cleaner for ABS to inside socket surface of fitting
and male end of pipe to depth of fitting socket.
6 − Promptly apply solvent cement to end of pipe and in-
side socket surface of fitting. Cement should be ap-
plied lightly but uniformly to inside of socket. Take
care to keep excess cement out of socket. Apply sec-
ond coat to end of pipe.
NOTE − Time is critical at this stage. Do not allow prim-
er to dry before applying cement.
7 − Immediately after applying last coat of cement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Turn pipe 1/4 turn during as-
sembly (but not after pipe is fully inserted) to distribute
cement evenly.
NOTE − Assembly should be completed within 20 sec-
onds after last application of cement. Hammer blows
should not be used when inserting pipe.
8 − After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made joint will show a
bead around its entire perimeter. Any gaps may indi-
cate a defective assembly due to insufficient solvent.
9 − Handle joints carefully until completely set.
Page 12
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