Hayward HDF400 User Manual

18 ONLYUSEGENUINEHAYWARDREPLACEMENTPARTS
51300803801REVB
FLUE GAS VENTING:
For installation outdoors, no additional venting is required for operation. Ensure top of unit remains unobstructed.
INDOOR INSTALLATION WITH NEGATIVE (CATI) OR POSITIVE (CATIII) PRESSURE VENTING SYSTEMS:
The heater is designed such
that it may be vented using either a negative-pressure or a positive-pressure venting system. The appropriate system of venting for a particular
site will depend on many factors such as vent termination needs (horizontal/vertical), clearance of vent termination, length of vent and the cost
of venting system. Table 5 (CATI) and Table 8 (CATIII) list the required indoor venting kits available for each system. Multiple forced- or in-
duced-draft units should never be vented using common venting or vent terminations. Never common vent this heater with other gas-burning
appliances.
NEGATIVE PRESSURE (VERTICAL ONLY, CAT I) VENTING:
NEGATIVE PRESSURE CAT I 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 with the appropriate vent kit adapter installed (see Table 5). Single-wall vent may be used in condi-
tioned spaces only. Clearance to combustible materials for single-wall vent is 9 inches. Double-wall (Type B) vent may be used in conditioned
spaces, but must be used in non-conditioned spaces. Clearance to combustible materials for double-wall vent is 6 inches. Smaller clearances
may be available; consult the National Fuel Gas Code.
CAT I MECHANICAL DRAFT SYSTEMS: Vent systems requiring power venting must use mechanical draft systems listed in accordance with
UL378 Draft Equipment. Selection of power venter and required clearances from combustible materials must follow draft equipment manufac-
ture’s instructions, National Fuel Gas Code, local codes and the information in this manual.
NEGATIVE PRESSURE CAT I VENT TERMINATION: Any 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. Terminations for Gas vents with listed 12 inches or less
diameter size and located not less than 8ft from a vertical wall or similar building feature shall terminate per Figure 10 and Table 6 using the
roof pitch to find the minimum termination height value of H. Terminations for Gas vents with listed 12in or less diameter size located less than
8ft from a vertical wall or similar building feature shall terminate not less than 2ft above the highest point where they pass through the roof and
not less than 2ft above any portion of a building within 10ft horizontally.
Model
Vent Dia
(in) Description Vent Pipe Application
Vent Pipe
Material
Vent
Termination
Requirement
HDF400 8
Vertical Vent-
ing Applica-
tions
Vent pipe to be installed ac-
cording to the venting tables in
the National Fuel Gas Code
(ANSI Z223.1/NFPA 54) for a
Category I gas appliance.
Single or Double
Wall, Galvanized,
Non-Sealed Vent
Pipe
Vertical Only
Table 5: Negative Pressure (CAT I) Indoor Vent Pipe & Terminal Specifications

Hayward HDF400 Specifications

General

Brand	Hayward
Model	HDF400
Category	Gas Heater
Language	English