Crown Boiler PHNTM399, Инструкция по установке и эксплуатации

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16
IV. Venting
A. General Guidelines (continued)
a. Use only listed vent/combustion air terminals.
i. Horizontal Sidewall Venting: Use tee
terminals for both vent and combustion air
as shown in Figure 5. Alternate snorkel
terminations are shown in Figure 6A and
Figure 6B.
ii. Vertical Roof Venting: Use straight
coupling on vent and two 90° elbows turned
downwards for combustion air as shown in
Figure 7 and Figure 8.
b. Maintain correct clearance and orientation
between vent and combustion air terminals.
i. Space centerlines of vent and combustion
air terminals minimum 12 in. (300 mm)
apart. More than 12 in. (300 mm) spacing is
recommended.
ii. If possible, locate vent and combustion
air terminals on the same wall to prevent
nuisance shutdowns. If not, boiler may
be installed with roof vent terminal and
sidewall combustion air terminal.
Table 6B: Vent/Combustion Air Equivalent Length Calculation Work Sheet
Combustion Air Vent
90° Elbow(s) (Installer Supplied) 90° Elbow(s) (CPVC Supplied with Boiler)
Nominal Diameter
Quantity
(Pc)
Equivalent
Length, per Pc
Subtotal,
Equivalent
Length (A)
Nominal Diameter Quantity
(Pc)
Equivalent Length,
per Pc
Subtotal,
Equivalent
Length (D)
4 in.
(100 mm or 110 mm)
13 ft. (4.0 m)
4 in.
(100 mm or 110 mm)
1 13 ft. (4.0 m) 13 ft. (4.0 m)
45° Elbow(s) (Installer Supplied) 90° Elbow(s) (Installer Supplied)
Nominal Diameter
Quantity
(Pc)
Equivalent
Length, per Pc
Subtotal,
Equivalent
Length (B)
Nominal Diameter
Quantity
(Pc)
Equivalent Length,
per Pc
Subtotal,
Equivalent
Length (A)
4 in.
(100 mm or 110 mm)
4.5 ft. (1.4 m)
4 in.
(100 mm or 110 mm)
13 ft. (4.0 m)
Straight Pipe, (Installer Supplied) 45° Elbow(s) (Installer Supplied)
Nominal Diameter
Quantity
Length,
ft or m
Equivalent
Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (C)
Nominal Diameter
Quantity
Length,
ft or m
Equivalent Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (B)
4 in.
(100 mm or 110 mm)
1
4 in.
(100 mm or 110 mm)
4.5 ft. (1.4 m)
* Total Equivalent Length (A+B+C) = 2.5 Ft. (760 mm) Straight Pipe, (CPVC Supplied with Boiler)
* Notes:
1. Calculated total equivalent length cannot exceed
maximum equivalent length shown in Table 5.
2. Vent and combustion air terminals do not count towards
total equivalent length.
3. Pressure drop for flexible polypropylene liner is 20%
greater than for rigid pipe. Multiply measured flexible
polypropylene liner length by 1.2 to obtain equivalent
length.
Example
Measure length of flexible polypropylene liner = 35 ft.
Equivalent length of flexible polypropylene liner = 35 ft.
x 1.2 = 42 ft.
4. Maximum equivalent length of flexible polypropylene liner
is 48 ft. (14.6 m).
5. All elbows referenced are short radius.
Nominal Diameter
Quantity
Length,
ft or m
Equivalent Length,
ft/ft or m/m
Subtotal,
Equivalent
Length (E)
4 in.
(100 mm or 110 mm)
2.5 ft.
(0.76 m)
1
2.5 ft.
(0.76 m)
Straight Pipe, (Installer Supplied)
Nominal Diameter
Quantity
Length,
ft
Equivalent Length,
ft/ft
Subtotal,
Equivalent
Length (C)
4 in.
(100 mm or 110 mm)
1
* Total Equivalent Length (A+B+C+D+E) =
Figure 5: Direct Vent - Sidewall Tee Terminations