Paloma PHH-32 part 2 - Manual (Page 8)

44
Vertical Vent Terminal Location
A, B, C, D
12" Min.
(300 mm)
Vent Pipe
Through Roof
Optional
The following chart with diagrams details the minimum dimensional information needed to determine the
proper location of the vertical vent terminal for direct-vent indoor tankless water heaters:
Location
U.S. Installation
Requirements
1
Canadian Installation
Requirements
2
A = Minimum clearance above the roof level. 12 in. (30.5 cm) above roof level. 18 in. (45.7 cm) above roof level.
B = Minimum clearance above anticipated snow
level.
12 in. (30.5 cm) above anticipated
snow level. 12 in. (30.5 cm) above anticipated
snow level.
C = Maximum clearance above roof level (without
additional support for vent pipe).
24 in. (61 cm) above roof level. 24 in. (61 cm) above roof level.
D = Maximum clearance above anticipated snow
level (requires additional vent support).
24 in. (61 cm) above anticipated snow
level. 24 in. (61 cm) above anticipated
snow level.
E = Required vent clearance from any gable,
dormer, or other roof structure with building
interior access (i.e., vent, window). 4 ft. (1.2 m) 4 ft. (1.2 m)
F = Required vent clearance from any forced air
inlet, including dryer and furnace air inlets.
10 ft. (3 m) 6 ft. (1.8 m)
G = Minimum/maximum horizontal distance
between vent terminals
5.5 in. (14 cm)/24 in. (61 cm) 5.5 in. (14 cm)/24 in. (61 cm)
1 In accordance with current ANSI Z223.1/NFPA 54 National Fuel Gas Code.
2 In accordance with current CSA B149.1 Installation Codes.
The vertical intake air termination requires a
return bend or two short or long sweep radius 90°
elbows to keep the inlet downward and prevent
entry of rain. Refer to figure above for the proper
location of the air intake with respect to the
exhaust outlet termination. The vertical exhaust
outlet termination is a 2-inch or 3-inch pipe which
terminates at least 12 inches above the air intake
termination. The air intake and exhaust outlet
terminations must be at least 12 inches above the
roof line or anticipated snow levels.
Venting
INSTALLATION INSTRUCTIONS
Venting for Direct-Vent Water Heater (cont.)