Gradient syncFURNACE mOD-200 Installation & Operation Manual page 20

Notes:
1. syncFURNACE OD is supplied with 3" Flue Gas and Combustion Air vent connections. If reducing to
2", make transition as soon as possible.
2. Minimum acceptable equivalent vent length is 5 feet (1.53m) for 2" diameter materials and 8
feet (2.44m) for 3" diameter materials.
3. For elbows, both 2" & 3" diameter, use the following to calculate max equivalent length:
a. 90° elbow long radius – equivalent length = 5 feet (1.53m)
b. 90° elbow short radius – equivalent length = 8 feet (2.44m)
c. 45° elbow – equivalent length = 3 feet (.92m)
4. Equivalent length of elbows must be included when determining total equivalent vent length.
5. Max equivalent vent length is allowable length for each (flue gas or combustion air) vent run.
6. Both Flue Gas and Combustion Air vent piping must use same diameter material for entire system.
7. The equivalent length of the termination does not need to be included when calculating equivalent
length of the venting system. ie, if using two 90° elbows and a 45° elbow (one 90° elbow + one
45° elbow for Flue Gas, one 90° elbow for Combustion Air) as a termination, these elbows do not
need to be included in the equivalent length calculation nor for the max number of elbows
calculation.
8. If a low point is required in the venting system, proper condensation drain pipe(s) must be
installed according to the instructions of the vent material supplier.
9. Condensate inside flue gas venting must drain from the termination point back to the water heater.
Combustion Air vent piping must slope away from water heater towards termination point.
a. Horizontal venting runs, flue gas termination point must slope back towards water heater
and combustion air must slope away from water heater towards termination point at a slope
no less than:
i. For 2" Ø pipe, horizontal runs < (less than) 4 feet (1.22m) = ¼" (6.4mm) per foot
ii. For 2" Ø pipe, horizontal runs > (greater than) 4 feet (1.22m) = ½" (13mm) per foot
iii. For 3" Ø pipe, ¼" (6.4mm) per foot
10. In Canada, the first three (3) feet (.92m) of vent piping must be readily accessible for inspection.
11. DO NOT use ABS or any cellular core pipe for Flue Gas vent piping.
12. Vent Adapters and Termination Kits are acceptable if they are marked and meet the requirements
of the above Required Venting System Standards for the country they are being installed in. Vent
Adapters and Termination Kits can only be used in the above diameters and if provided by the
following manufacturers:
a. IPEX – ULC-S 636 / ANSI/ASTM F441 approved
b. CENTROTHERM Eco Systems – Innoflue SW, Flex & Concentric - ULC-S 636 / UL-1738 app.
c. M&G Duravent
d. NOVAFLEX GROUP – Flexmaster – Z-Vent AL-29-4C approved, Z-Dens polypropylene
e. Ecco Polyproplyne Vent
13. When cutting venting pipe, ensure square cuts are made and remove all burrs from joints and
fittings. DO NOT allow burrs and debris to enter venting system.
14. If using PVC or CPVC gas venting material, all joints must be properly cleaned, primed and
cemented. Only use primers and cements listed in the above table and that are approved for use
with the venting material.
15. Only use approved pipe cement and primers. Consult manufacturer's installations to ensure
correct use of products.
16. Do not use excessive amounts of primers and cements when joining PVC and/or CPVC gas venting
material. Using excessive amounts can lead to pooling inside venting system. Upon completion of
venting system assembly, allow venting system cement to properly cure for a minimum of 8 hours
before turning on the gas and operating the burner on the water heater. Consult the pre-
commission procedure for plastic venting in this manual for further information.
syncFURNACE OD Instruction & Installation Manual – Rev 09 Pg. 20 of 81