Installation Guide

Pomona, CA Clemmons, NC Nashville, TN
Tel: [phone] www.haywardpool.com
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
15
Listed
cap
Listed gas
vent
12
Roof pitch is x/12
Lowest discharge opening
H (minimum)-
Minimum height from roof
to lowest discharge opening
x
VERTICAL VENTING – NEGATIVE PRESSURE
VENT SIZING
Size the vent pipe according to the venting
tables in the National Fuel Gas Code (ANSI
Z223.1/NFPA 54) for a Category I gas appliance
using single-wall or double-wall (Type B) gas
vent. Vent pipe diameter should not be less than
the size of the vent pipe adapter on the heater
(see Table 6). The maximum vent height can-
not exceed 50 ft. The total lateral (horizontal)
length cannot exceed 1/2 of the total vent height.
The system may have up to 3 90-degree elbows
maximum. Single-wall vent may be used in
conditioned spaces only. Clearance to combus-
tible materials for single-wall vent is 9 inches.
Double-wall (Type B) vent must be used in non-
conditioned spaces.
VENT TERMINATION
Vent extending through a roof or wall must be listed double-wall (Type B) vent, and pass through an
approved roof jack, or roof thimble. A listed vent cap must be used. Gas vents that are spaced less than 8 ft
horizontally from a vertical wall or similar obstruction shall terminate not less than 2 ft above any portion
of a building within 10 ft. Gas vents that are spaced 8 ft or more horizontally from a vertical wall or similar
obstruction shall terminate above the roof a distance H based on the roof pitch. Using the roof pitch, nd the
minimum value of H using Figure 5 and Table 7.
Table 6
Vent Pipe Diameters for
Negative-Pressure Indoor Vent Kits
Indoor Vent Kit
Part Number Heater Model
Vent Pipe
Diameter
UHXNEGVT11501 H150FD 6 inch
UHXNEGVT12001 H200FD 6 inch
UHXNEGVT12501 H250FD 6 inch
UHXNEGVT13001 H300FD 8 inch
UHXNEGVT13501 H350FD 8 inch
UHXNEGVT14001 H400FD 8 inch
UHXNEGVT15001 H500FD 6 inch
Figure 5
Minimum Height from Roof for Vent Cap
Table 7
Height Requirements for Vent Caps
(see Figure 5)
Roof Slope
Min. Height H from Roof to
Lowest
Discharge Opening
Flat to 6/12 1.0 ft
Over 6/12 to 7/12 1.25 ft
Over 7/12 to 8/12 1.5 ft
Over 8/12 to 9/12 2.0 ft
Over 9/12 to 10/12 2.5 ft
Over 10/12 to 11/12 3.25 ft
Over 11/12 to 12/12 4.0 ft
Over 12/12 to 14/12 5.0 ft
Over 14/12 to 16/12 6.0 ft
Over 16/12 to 18/12 7.0 ft
Over 18/12 to 20/12 7.5 ft
Over 20/12 to 21/12 8.0 ft