Diagram For Vertical Venting - Heat Transfer MODCON VWH 300 LP Installation & Maintenance

PART 6: VENTING, COMBUSTION AIR & CONDENSATE REMOVAL
J. DIAGRAM FOR VERTICAL VENTING
Figure 6-9
All vent pipes must be glued, properly supported and the exhaust must be pitched a minimum of a ¼" per
foot back to the heater (to allow drainage of condensate). Exhaust connection insertion depth should be a
minimum of 2½" for models 300/500 and 3" for 850. When placing support brackets on vent piping, the
first bracket must be within 1 foot of the appliance and the balance at 4 foot intervals on the vent pipe.
The boiler venting must be readily accessible for visual inspection for the first three feet from the boiler.
37
GAS-FIRED HOT WATER SUPPLY BOILER
TWO PIPE ROOF VENTING WITH TEE (INTAKE)
AND COUPLING (EXHAUST)
n
WARNING
Boiler Manual
Fig. 6-10 Multiple Concentric Vent
Spacing – Vertical
Fig. 6-11 Multiple Concentric Vent
Spacing – Horizontal
LP-205-G Rev. 6/23/08
(CONTINUED)