Armstrong Air Conditioning A97DSMV, Installation Instructions Manual

Page: 14 / 68

507029-03 Page 14 of 68 Issue 1622
Venting Practices
Figure 15
If this gas furnace replaces a furnace which was commonly vented with
another gas appliance, the size of the existing vent pipe for that gas
appliance must be checked. Without the heat of the original furnace
flue products, the existing vent pipe is probably oversized for the single
water heater or other appliance. The vent should be checked for proper
draw with the remaining appliance.
Piping Suspension Guidelines
NOTE: Isolate piping at the point where it exits the outside wall or
roof in order to prevent transmission of vibration to the structure.
Wall Thickness Guidelines
Figure 14
Joint Cementing Procedure
All cementing of joints should be done according to the
specifications outlined in ASTM D2855.
1. Measure and cut vent pipe to desired length.
2. Debur and chamfer end of pipe, removing any ridges
or rough edges. If end is not chamfered, edge of pipe
may remove cement from fitting socket and result in a
leaking joint.
3. Clean and dry surfaces to be joined.
4. Test fit joint and mark depth of fitting on outside of pipe.
5. Uniformly apply a liberal coat of PVC primer for PVC
or use a clean dry cloth for ABS to clean inside socket
surface of fitting and male end of pipe to depth of fitting
socket.
DANGER
DANGER OF EXPLOSION!
Fumes from PVC glue may ignite during system check.
Allow fumes to dissipate for at least 5 minutes before
placing unit into operation.
6. Promptly apply solvent cement to end of pipe and inside
socket surface of fitting. Cement should be applied
lightly but uniformly to inside of socket. Take care to
keep excess cement out of socket. Apply second coat
to end of pipe.
NOTE: Time is critical at this stage. Do not allow primer
to dry before applying cement.
7. Immediately after applying last coat of cement to pipe,
and while both inside socket surface and end of pipe
are wet with cement, forcefully insert end of pipe into
socket until it bottoms out. Turn PVC pipe 1/4 turn
during assembly (but not after pipe is fully inserted) to
distribute cement evenly. DO NOT turn ABS or cellular
core pipe.
NOTE: Assembly should be completed within 20 seconds
after last application of cement. Hammer blows should not
be used when inserting pipe.
8. After assembly, wipe excess cement from pipe at end
of fitting socket. A properly made joint will show a bead
around its entire preimeter. Any gaps may indicate a
defective asembly due to insufficient solvent.
9. Handle joints carefully until completely set.