27
Figure 45
Figure 46
Figure 47
Figure 48
extending through the outer casing for
attachment of drain tubing.
3. The drain tubing should include a
water trap of a height at least equal to the
maximum expected operating pressure at
the appliance outlet to avoid allowing flue
gases to vent through the drain. See Figure 48.
4. Drain length should be installed indoors to
prevent freezing.
rELIEF VaLVE (DIS onLy)
relief Valve (rV)
1. The relief valve is intended for use with diesel
engines to provide extra protection to the
chimney in case of a delayed ignition of backfire.
2. The connection of the Relief valve and the
DIS chimney is done with the use of the ANSI
Female Flange Adaptor (FFA).
3. The valve is factory calibrated to open at
27 in. wc.
4. The relief valve must be supported
independently of the rest of the exhaust
system. The best way to accomplish this is to
locate an Anchor Plate (AP) support at the
joint between the ANSI Flange adaptor and
the adjacent fitting. See Figure 49.
5. It is crucial that the support be properly
secured to building structure
so that it can withstand the forces generated
in case of delayed fuel ignition.
6. It must be installed in combination with a
Tee 45° Relief Valve (T45RV).
SECtIon F - tHErmaL EXpanSIon
thermal Expansion :
1. When Model DIS / DAS is in use, thermal
expansion will occur on the inner flue and
outer casing.
2. A good estimation for thermal expansion
is approximately 1” per 100’ chimney length
per 100°F rise. Thermal expansion [inch] =
(length[feet]/100)x(ΔT[°F]/100)
3. Thus, the thermal expansion is dependant
on the inner flue temperature and the length
of the chimney between two (2) fixed points.
4. Good installation requires that expansion
Better Draft
Flip Top
Bird Screen
Trap Height Equal to Max
Appliance Outlet Pressure
Drain Length
Drain
Drain Tubing
(by others)
