Venting Connections - FLOWMAX Technologies FLOWMAX-120 Instruction Manual

3.9 Venting
Improper venting of combination water heater can result in excessive levels of carbon monoxide which
can result in severe personal injury or death. This combination water heater must be vented in
accordance with the "Venting of Equipment" section of the latest edition of the ANSI Z223.1 / NFPA 54
Natural Gas Code and/or the "Venting systems and air supply for appliances" section of the latest
version of the CAN/CSA B149.1 Natural Gas and Propane Installation Code in Canada and in
accordance with all applicable local building codes.
Venting Guidelines
For best results, keep the vent system as short and straight as possible.
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Locate the combination water heater as close as possible to the vent termination.
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The combination water heater vent must not be common vented with any other gas appliance or vent stack.
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Slope vent upwards towards the vent terminal at a rate of 1/8" per foot (1% slope).
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Vent termination must be a minimum of 12" above grade or expected snowfall.
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Vent and air intake pipe must be supported every 4 feet of horizontal run and every 5 feet of vertical run.
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FLOWMAX and Direct Vent
All FLOWMAX Combination Water Heaters are prepared at the factory to be direct vent (sealed
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combustion) units which draw all of their required combustible air directly from outside the building.
All FLOWMAX Combination Water Heaters use 2" or 3" diameter exhaust and 2" or 3" diameter air intake
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pipe. .
The air intake vent materials can be made of ABS, PVC, or CPVC materials and in accordance with all
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applicable local building codes.
Contaminated Make-Up Air Will Damage the Unit
Recommend not to operate the combination water heater in an area that is or will be under construction or
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renovation.
The FLOWMAX warranty will not cover damage and premature wear caused to the unit due to installation in
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a contaminated environment.
All of the exhaust venting connections must be leak checked with a soap solution upon initial start up of the
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water heater. Any leaks must be repaired before continuing operation of the water heater.
Warranty will not be available if the water heater is used for construction heat.
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Exhaust Vent Piping Materials
Use only 2" or 3" solid PVC/CPVC schedule 40 PVC/CPVC or ULC S636 pipe and fittings.
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Venting requirements in USA and Canada are different. Please consult with the most recent edition of the
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National Fuel Gas Code (ANSI Z223.1 / NFPA 54) or CAN/CSA B-149.1 as well as local codes for
applicable venting regulations and restrictions.
For installation in Canada, field supplied plastic vent piping must comply with CAN/CSA B-149.1 (latest
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edition) and be certified to the standard for type BH Gas Venting Systems, ULC S636 components of this
listed system shall not be interchanged with other vent systems or unlisted pipe/fittings.
components and specified primers and glues of the certified vent system must be from a single
manufacturer and not intermixed with other system manufacturer's vent system parts. The supplied vent
adaptors are certified as part of the combination water heater.
For all units installed with vertical exhaust, must have an additional approved condensate drain installed on
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the Horizontal section of the exhaust vent. Fittings must be ULC S636 approved.
PVC/CPVC pipe/fittings have been approved for use on this appliance with zero clearance to combustibles.
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INSTALLATION INSTRUCTIONS
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