Dettson Chinook C15-M-V Instructions D'installation Et Manuel Du Propriétaire page 22

The maximum allowable vent length for the vent and
combustion air pipe (when used) is listed in table 13
and depends on the furnace input. The maximum length
must include straight pipe and any fitting and termination.
Equivalent length of various fitting is list in table 14.
A minimum linear length of 5 ft must be respected.
To properly measure the Equivalent Vent Length :
1. Measure the linear pipe distance from the furnace
to the termination for each pipe.
2. Count the number of elbows for each pipe.
3. For each pipe, multiply the number of elbows by the
equivalent length for the type of elbow used (see
table 14). Record the equivalent length of all the
elbows for each pipe.
4. Record the equivalent length of the termination
used (see table 14 ).
5. Add the equivalent length of the elbows and
termination to the linear distance measured.
6. If the calculated vent length is greater than the
maximum allowed vent length, consider modifying
the termination location or use a greater pipe
diameter.
Table 13 – Maximum equivalent vent length (ft) for
modulating units and altitude up to 4500 ft
Unit size
BTU/hr
15,000
30,000
45,000
60,000
75,000
105,000
120,000
Vent pipe dia.
2" 3"
300 N/A
180 N/A
70 90
70 90
70 90
15 80
10 40
Table 14 – Deduction for fittings
Type of elbow
45° standard
45° long sweap
90° standard
90° long sweap
Tee
7.8 EXHAUST PIPE CONNECTION
TO FURNACE
Never common vent with any other appliance. Do not
install in the same chase or chimney as a metal or high
temperature plastic pipe from another gas or fuel-burning
appliance unless the required minimum clearances to
combustibles are maintained between the approved PVC
pipe and the other pipes. Clean and deburr all pipe cuts.
In the included parts bag, an exhaust venting gasket is
supplied and needs to be installed on the exhaust of the
top panel. (See figure 27)
When 3" pipe is used, connect a 2" to 3" coupling to the
2" pipe.
For proper installation of venting/exhaust pipe:
1. Position the supplied venting gasket on the top
panel exhaust.
2. Slowly slide a 2" diameter pipe throught the venting
gasket. This step will be easier if pipe is chamfered.
3. Position this venting pipe length on the rubber vent
collector and tighten the collar.
4. Install the remaining vent pipes. It is recommended
that all pipes be cut, prepared, and preassembled
before permanently cementing any joint.
5. Working from furnace to outside, cut the pipe to the
required length(s).
6. Deburr the inside and outside of the pipe.
7. Chamfer the outside edge of pipe for better
distribution of primer and cement.
8. Clean and dry all surfaces to be joined.
9. Check dry fit of the pipe and mark insertion depth
on the pipe.
10. After the pipes have been cut and preassembled,
apply a generous layer of cement primer to the pipe
fitting socket and end of the pipe to insertion mark.
Quickly apply approved cement to end of the pipe
21
Equivalent Length (ft)
5
2.5
10
5
1.5