Element
Section 7: Venting
L-OMM-0003_A
• 10/8/2021 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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VENTING
All Element models use the positive pressure generated by the burner system blower to push
combustion products out of the vent. Since the vent system is under positive pressure and must
be capable of containing condensate, it must be constructed of schedule 40 solid PVC or CPVC
pipe. Use of cellular core PVC (ASTM F891), cellular core CPVC, or Radel® (polyphenylsulfone)
in nonmetallic venting systems is prohibited. Polypropylene or single or double wall stainless steel
venting listed by ETL, UL, ULC or CSA for Category IV positive pressure gas appliance venting
may be used instead of solid PVC or CPVC plastic pipe venting.
Follow the instructions below for installing solid PVC or CPVC pipe. For other listed vent
materials, follow the vent manufacturer’s instructions for installation, sealing, supporting and
terminating their vent system. Covering non
‐
metallic vent pipe and fittings with thermal insulation
is prohibited.
The stainless-steel vent connection located near the front of the water heater is 6-5/8" O.D., to
accept a 6 inch PVC or CPVC pipe coupling. A reducer coupling may also be used to
accommodate smaller or larger vent pipe. (See Maximum Vent Length tables). Do not use a
barometric damper with the Lync Water Heater positive pressure vent. The Lync Water Heater
can be vented either vertically, through a ceiling or roof, or horizontally through a wall.
The Element includes Category IV positive pressure gas appliance venting and can be routed to
the outdoors in any direction, from the flue outlet of the water heater, except down. The vent must
be installed and supported at least every four feet to slope downward toward the water heater
vent connection with at least ¼ inch drop per linear foot of horizontal vent run, to allow proper
drainage of accumulated condensation. The venting system shall also have a means for collection
and disposal of condensate. All penetrations through walls and roofs must be weather and gas
tight, such that rain and products of combustion cannot pass from outdoors back indoors.
For common venting applications, please call your Lync representative for your specific
installation.
Additional steps required when venting with solid PVC or CPVC pipe:
1.
Read and follow the information, instructions and warnings in “VENTING” section.
2. Do not insulate the plastic vent pipe.
3. Design the vent pipe route so that normal expansion and contraction due to changing
temperatures does not bind or put stress on cemented pipe fittings.
4. A 6
” pipe coupling must always be the first fitting attached to the vent connection when using
a PVC or CPVC vent system. If a listed stainless steel or polypropylene Category IV vent
system is used, the correct adapter for attaching and sealing to the Lync Water Heater 6-5/8
”
O.D. vent connection must be obtained from the manufacturer of the vent system.
5. For PVC or CPVC, dry-fit the 6" pipe coupling onto the vent connector. Then remove the
coupling and apply a liberal coating of room temperature vulcanizing (RTV) adhesive to the
outside of the vent connector and to the inside of the plastic pipe coupling. Before the RTV
sets, slide the coupling over the vent connector while rotating approximately 1/8 of a turn.
Inspect and apply additional RTV to the joints, if needed, to provide a tight seal.
6. Drill a pilot hole through the PVC or CPVC coupling flange and into the center of the stainless-
steel vent connector flange in three equally spaced locations around the pipe. Drive stainless
steel sheet metal screws through the pilot holes to attach and firmly hold the plastic coupling
onto the vent connector flange.