Vent Installation (Indoor Installation Or Outdoor Shelter) - Vertical Venting; Direct Air Intake Duct With 76 Mm (3 In - Uk) Pvc Pipe (Indoor Installation) - Pentair MASTERTEMP MT125HD Installation And User Manual

16 | Section 2. Installation
COMBUSTION AIR SUPPLY
Air Supply Requirements Guide for MasterTemp
Minimum Net Free Open Area for Each Opening*
(Square Inches/Centimeters)
All Air From Inside Building All Air From Outside Building
Model
Combustion Vent
200 sq. in. 200 sq. in.
125
1290 cm 1290 cm
2
*
Area indicated is for one of two openings;
one at floor level and one at the ceiling.
Table 4.
VENT INSTALLATION –
FLUEING MUST BE IN ACCORDANCE WITH EUROPEAN STANDARD CODES OF PRACTICE. Always
vent the heater to the outdoors (see above
Locate the heater so as to minimize the length of horizontal venting and the number of vent elbows required. Horizontal
vent runs must slope to allow exhaust condensate to drain and it is recommended to have a condensate drain as described
in the venting installation instructions.

Direct Air Intake Duct with 76 mm (3 in - UK) PVC Pipe (Indoor Installation)

For indoor heater installations where combustion air supply might be insufficient, the MasterTemp Heater 125 is certified for
a direct air intake duct using a 76 mm (3 in - UK) PVC pipe (Pentair P/N 461031). If outside air is drawn through the PVC duct
directly into the heater, the PVC pipe can be installed in accordance with the following requirements: The air intake opening MUST
be installed at least 30.5 cm (12 in.) above the roof line or normal snow levels for free air flow. The Category I or III exhaust vent
termination cap must have at least 1.8 m (6 ft.) minimum vertical clearance from air intake duct. (See Figure 21 below).
DO NOT USE PVC PIPE FOR FLUE EXHAUST VENT. FLUE EXHAUST VENT TEMPERATURES CAN BE IN EXCESS OF
204° C. FLUE EXHAUST VENT MUST BE CATEGORY I or CATEGORY III METAL VENT.
Figure 21.
MasterTemp 125 Pool and Spa Heater Installation and User's Guide
(CONTINUED)
Combustion Vent
50 sq. in. 50 sq. in.
323 cm . 323 cm
2 2 2
INDOOR INSTALLATION OR OUTDOOR SHELTER
*). Vent the heater vertically using double wall vent connector pipe.
NOTE
914 mm
min. (36")
76 mm (3") PVC pipe
305 mm min. (12")
Heaters
™
Chemicals should not be stored near the
heater installation. Combustion air can be
contaminated by corrosive chemical fumes
which can void the warranty.
NOTE *: Vent must be at least 2.4 m (8 ft) away from
nearest vertical surface. Vents extending 1.5 m (5 ft) or
more above the roof must be braced or guyed. Consult
your local code officials for detailed information.
WARNING!
Combustion PVC Air Intake 76 mm (3") Pipe
(Vertical or Horizontal)
No. of 90° Elbows Maximum Length in Meters (Ft)
0
1
2
3
4
Combustion Air Intake
76 mm (3") PVC pipe
914 mm
min. (36")
305 mm
152 mm
min. (12")
min. (6")
CAUTION
Each 90-degree elbow
reduces the maximum
horizontal PVC air
21 M (70 ft.)
intake duct run by 3.6
18 M (58 ft.)
m (12 ft.) and each
14 M (46 ft.)
10 M (34 ft.) 45-degree elbow in the
7 M (22 ft.)
PVC air intake duct run
reduces the maximum
run by 1.8 m (6 ft.). See
the Table above for
the maximum lengths
u s i n g 9 0 - d e g r e e
elbows.
WARNING
DO NOT USE PVC PIPE FOR FLUE
EXHAUST VENT. FLUE EXHAUST VENT
TEMPERATURES CAN BE IN EXCESS OF
204°C. FLUE EXHAUST VENT MUST BE
CATEGORY I OR CATEGORY III METAL
VENT.
NOTE