POWER VTX
®
WATER HEATER
19
PV500-68 06/16
8 VENTING
8.1 Venting the POWER VTX
®
:
All POWER VTX
®
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.
If the cold inlet water
temperature is above 100°F, then solid CPVC or ETL, UL, ULC or CSA listed polypropylene or stainless steel
venting is required and the vent limit switch must be adjusted for the higher temperature rating allowed by
these vent materials (Contact factory for instructions).
Utilisez une catégorie IV PVC, CPVC ou ETL, UL, ULC ou CSA acier inoxydable ou inscrits conduit d'évacuation en
polypropylène. Ne sélectionnez pas la taille du tuyau de ventilation basée uniquement sur le diamètre raccord de
l'appareil.
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 back 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 POWER VTX
®
positive pressure vent.
The POWER VTX
®
water heater can be vented either vertically, through a ceiling or roof, or horizontally through a
wall. The POWER VTX
®
is a Category IV positive pressure gas appliance and venting 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. 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.
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 (pipe getting longer) and contraction (pipe getting shorter),
due to on and off temperatures, does not bind or put stress on cemented pipe fittings.
4. A 6-inch pipe coupling must always be the first fitting attached to the POWER VTX
®
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 POWER VTX
®
6-5/8 inch O.D. vent connection must be
obtained from the manufacturer of the vent system to be installed.
5. For PVC or CPVC, dry-fit the 6” pipe coupling onto the POWER VTX
®
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 an air and water 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.
7. Clean and deburr all solid PVC or CPVC pipe ends, then trial assemble the entire vent system vent before
joining with cement. Mark the pipe and fittings to identify their locations, then disassemble. Reassemble the
vent system using fresh PVC cement to connect PVC pipe and fresh CPVC cement to connect CPVC pipe. If
both solid PVC and solid CPVC pipe are used in the same vent system, all joints between the two types of pipe
must be made with fresh cement suitable for both materials. Follow the cement manufacturer’s instructions for
making sound air and water tight joints.
