HeatStation™ CONDENSING WATER BOILER
23
34-1161 05/17
8.2.4 Connecting to an Existing Vent System
Do not connect the HeatStation to an existing vent system, until it has been confirmed the existing vent system
complies with all requirements for a new vent system. A venting system in full compliance with the instructions
provided in this manual is required for safe and reliable operation of the HeatStation
.
Do not connect the HeatStation
to a masonry chimney.
WARNING: Before operating the appliance connected to an existing vent system, confirm the vent system
complies with all guidance and requirements for a new vent system specified in this manual. Failure to
confirm the existing vent system complies can result in unsafe operation and the potential for poisonous
carbon monoxide to enter occupied areas and can cause property damage, personal injury, exposure to
hazardous materials or death.
8.3
PVC Vent Installation
Follow the instructions below for installing schedule 40 solid PVC venting.
The stainless steel vent connection located near the rear of the boiler is 8
"
I.D with an internal gasket and clamp. This
connection will accept most 8 inch stainless or polypropylene venting. The HeatStation is also provided with an
adapter which will reduce the connection to 6 5/8
"
in order to directly couple to a PVC or CPVC vent system. (See
Section 8.2.1 Maximum Vent Length (Equivalent Lengths).
1. Read and follow the information, instruct
ions 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. An adapter, increasing or reducing fitting must always be the first venting material attached to the HeatStation,
when using PVC venting.
5. The adapter must be acceptable for the return temperatures up to 140
°
F and provide a sound air and water tight
seal.
6. Clean and deburr all solid PVC 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 the PVC 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.
F
ollow the cement manufacturer’s instructions for making sound air and water tight joints.
7. Vent support
– The PVC 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.
8. 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.
9. For proper vent operation, terminate the vent to prevent wind, water, debris or animals from obstructing the vent.
This can be done by terminating the vent downward and attaching a ¼
"
mesh to the outlet. 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. With the gas supply turned
off, energize the HeatStation 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.
10. Do not use a barometric damper with the HeatStation venting system. Barometric dampers are designed for use
with certain Category I negative pressure vent systems. The HeatStation Category IV vent system operates with
positive vent pressure and will not operate safely with a barometric damper.
