Vent Installation (Indoor Installation For U.s. Or Outdoor Shelter For Canada); Vertical Venting - Negative Pressure - Pentair MASTERTEMP 125 Guide D'installation Et D'utilisation

Section 3. Installation Instructions
20
VENT INSTALLATION –
(Category I)
Always vent the heater to the outdoors, see Note*.
• Vent it vertically using Type "B" double wall vent connector pipe.
Locate the heater so as to minimize the length of horizontal venting and the number of vent elbows required. Horizontal
vent runs must slope up 1/4" per foot (2cm/M) from the heater to allow exhaust condensate to drain and it is recommended
to have a condensate drain as described in the venting installation instructions.
VERTICAL VENTING
(See Figures 12, 13 and
Vent the heater vertically in a negative pressure (positive draft) system in
accordance with the National Fuel Gas Code, ANSI Z223.1/NFPA 54 and/or CSA
B149.1, Natural Gas and Propane Installation Codes, and local codes. Type "B"
Double-wall vent connector is recommended; however single-wall pipe is allowed
by the National Fuel Gas Code in some circumstances. Consult your local code
official for detailed information. Do not use a draft hood with this heater.
To connect a negative pressure metal gas vent to the heater, order the appropriate
Metal Flue Collar from the chart below:
Metal Flue Collar
4 x 6" 77707-0076
4 x 8" 77707-0077
5, to determine allowable vent sizes for your heater.
1. See Table
Table 7 is for installations in which the total lateral vent length (that is, the horizontal distance from the flue
NOTICE:
collar to the main vertical portion of the vent) is less than 1/2 the total vent height (the vertical distance from the flue collar
to the vent termination) and which have three or less elbows in the system. For venting systems which do not meet these
conditions, consult the National Fuel Gas Code, ANSI Z223.1 (U.S.), or the standards CSA B149.1 and B149.2 (Canada).
Read "VERTICAL VENTING – NEGATIVE PRESSURE" before using this table.
– Permitted Minimum and Maximum Vent Heights By Size and Heater Model
Table 5.
Type "B" Double-Wall Vent with Type "B"
Double-Wall Connector in Feet (Meters)
Vent Size
Height min./max.
6 in. 6 ft. (1.8)/100 ft. (30.5)
7 in. 6 ft. (1.8)/100 ft. (30.5)
8 in. 6 ft. (1.8)/100 ft. (30.5)
9 and 10 in. 6 ft. (1.8)/50 ft. (15.3)
MASTERTEMP 125 Pool and Spa Heater Installation and User's Guide
INDOOR INSTALLATION (U.S.) OR OUTDOOR SHELTER (CANADA)
- NEGATIVE PRESSURE
14)
Part No.
Model 125
NOTE *: Vent must be at least eight (8) feet away from
nearest vertical surface. Vents extending five (5) feet or
Consult your local code officials for detailed information.
Type "B" Double-Wall Vent with
Single-Wall Connector in Feet (Meters)
Model 125
Vent Size
Height min./max.
6 in. 6 ft. (1.8)/15 ft. (4.6)
7 in. 6 ft. (1.8)/8 ft. (2.4)
8 in. Not Rec.
9 in. Not Rec.
10 in. Not Rec.
more above the roof must be braced or guyed.
Clean the Interior Surface
V V Vent Bod y y
Clean and RTV
This Surface
Combustion
Chamber
Flue Collar
Figure 12.
Rev. C 3/2019
4" x 8" Metal
Flue Collar
Vent Pipe