Heat Transfer MODCON VWH 300 LP Installation & Maintenance page 39

PART 6: VENTING, COMBUSTION AIR & CONDENSATE REMOVAL
10' 0" MIN.
24" MIN.
ROOF VENTING WITH
STAINLESS STEEL (AL294C)
SUPPORT
BRACKETS
Figure 6-13
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.
GAS-FIRED HOT WATER SUPPLY BOILER
ROOF EXHAUST
RAIN CAP - STAINLESS STEEL
4" Z-FLEX 2SVSRCF04
6" Z-FLEX 2SVSRC06
AIR INTAKE
GALVANIZED/B-VENT
12" OVER MAXIMUM
SNOW LEVEL OR 24"
WHICHEVER IS GREATER
SUPPORT
BRACKETS
NOTE: VENT MUST BE AT LEAST 12" OVER MAXIMUM SNOW
LEVEL OR 24" WHICHEVER IS GREATER - CHECK WITH LOCAL
CODE REQUIREMENTS
n
WARNING
DIAGRAM FOR HORIZONTAL VENTING
RIZONTAL VENTING
A. FOR EVERY 1" OF
OVERHANG THE
EXHAUST VENT
MUST BE
LOCATED 1"
VERTICAL BELOW
OVERHANG
(OVERHANG
MEANS TOP OF
SINGLE BOILER
BUILDING
STRUCTURE AND NOT TWO ADJACENT WALLS [CORNER OF
BUILDING]).
B. 12" SEPARATION BETWEEN BOTTOM OF EXHAUST OUTLET AND TOP
OF AIR INTAKE (TYP.)
C. MAINTAIN 12" MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED
SNOW LEVEL OR GRADE WHICHEVER IS GREATER (TYP.)
D. MINIMUM 12" BETWEEN VENTS WHEN INSTALLING MULTIPLE VENTS
E. 12 " MIN. BEYOND INTAKE
Figure 6-12
SIDEWALL VENTING
WITH STAINLESS STEEL
AIR INTAKE
GALVANIZED
B-VENT
SIDE WALL EXHAUST
TERMINATION
4" Z-FLEX 2SVSRTF04
6" Z-FLEX 2SVSRTX06
12"
12"
7' or 1'
ABOVE MAX.
POTENTIAL
SNOW LEVEL
Boiler Manual
(CONTINUED)
E
A
D
MULTIPLE BOILERS
C
VT-A Rev. 8/28/09
LP-205-Y Rev. 1/30/09
38