M3
CONDENSING WATER BOILER
24
34-1115 12/15
8.4 CPVC Vent Installation
Follow the instructions below for installing schedule 40 solid CPVC venting
The stainless steel vent connection located near the rear of the boiler is 5-7/8” O.D., to accept 6 inch I.D. schedule
40 CPVC pipe. After installing a short length of 6 inch CPVC pipe to the vent connection, an increasing or reducing
fitting can be connected to adapt to a larger or smaller vent systems (See Section 8.2.1 Maximum Vent Length
(Equivalent Lengths).
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 length of 6” schedule 40 CPVC pipe must always be the first venting material attached to the M3 when using
CPVC venting. Do not use PVC pipe or other PVC components in a CPVC vent installation.
5. Dry-fit the length of 6” CPVC pipe onto the M3 vent connector. Then remove the pipe 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. Before the RTV sets, slide the pipe 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 sound air and water tight seal.
6. Drill a pilot hole through the CPVC pipe 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 pipe onto the vent connector flange.
7. Clean and deburr all solid 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 CPVC cement to connect the CPVC pipe. Follow the cement manufacturer’s instructions for making
sound air and water tight joints.
8. Vent support – The CPVC vent system must be supported at intervals no greater than four feet, to prevent
sagging, distortion and stress on pipe fittings. Vertical pipe must also be supported to avoid stress on all
cemented pipe fittings and to prevent putting excessive weight on the appliance vent connection.
9. The vent pipe must be sealed at the point where it passes through a wall or roof, to prevent rain, insects or flue
products from entering the living space or interior of the building.
10. For proper vent operation and to protect the gas vent from wind and weather, attach a UL listed vent termination
to the outdoor end of the vent or otherwise provide suitable termination to prevent wind, water, debris or
animals from obstructing or entering the vent. Testing for leaks – Once the vent system is installed, it must be
checked to confirm all joints in the vent system are air and water tight. After the vent is assembled, close the
end of the vent with a taped plastic bag or some other temporary closure. With the gas supply turned off,
energize the M3 combustion blower to apply air pressure to the vent system. Spray each joint and vent
connection with commercially available leak detection liquid to confirm no air is escaping from any point. Repair
any leaks and retest. After testing is complete, de-energize the combustion blower, wipe clean the leak
detection liquid and REMOVE the temporary vent closure.
11. Do not use a barometric damper with the M3 venting system. Barometric dampers are designed for use with
certain Category I negative pressure vent systems. The M3 Category IV vent system operates with positive vent
pressure and will not operate safely with a barometric damper.
8.5 Polypropylene or Stainless Steel Vent Installation
Follow the instructions below for installing an ETL, UL, ULC or CSA listed Category IV Polypropylene or Stainless
Steel venting system.
The stainless steel vent connection located near the rear of the boiler is 5-7/8” O.D., to accept the venting system
adapter available from the manufacturer of the listed Polypropylene or Stainless Steel venting system. After installing
the adapter to the M3 vent connection, the vent size can be increased or reduced using vent system parts available
from the manufacturer of the listed vent system. (See Section 8.2.1 Maximum Vent Length (Equivalent Lengths).
1. Read and follow the information, instructions and warnings in “VENTING” section.
2. Obtain the correct adapter from the manufacturer of the listed Polypropylene or Stainless Steel venting system
being installed to attach and seal their venting system to the M3 5-7/8 inch vent connection outlet. Attach the
adapter to the M3 vent connection following the instructions provided by the adapter’s manufacturer.
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