MasterTemp Pool and Spa Heater P/N 474131 Rev. M 8/2020
30
NOTE: KEEP A 150 CM (6 IN) MINIMUM CLEARANCE BETWEEN THE VENT PIPE AND
COMBUSTIBLE SURFACES. FOLLOW THE VENT MANUFACTURER’S INSTRUCTIONS
AND CODE REQUIREMENTS.
Each 90° bend reduces the maximum horizontal vent run by 3.6 m (12 feet) and each 45°
bend in the vent run reduces the maximum vent run by 1.8 m (6 feet). See Table 7 (page 29)
for the maximum vent length using one 90° bend.
Area
Likely Contaminants
Chlorinated swimming
pools and spas
Pool or spa cleaning chemicals. Acids, such as hydrochloric or muriatic acid.
New construction and
remodeling areas
Glues and cements, construction adhesives, paints, varnishes, and paint and var-
nish strippers. Waxes and cleaners containing calcium or sodium chloride.
Beauty parlors
Permanent wave solutions, bleaches, aerosol cans containing chlorocarbons or
fluorocarbons.
Refrigeration plants or
various industrial fin-
ishing and processing
plants
Refrigerants, acids, glues and cements, construction adhesives.
Dry cleaning and laundry
areas
Bleaches, detergents, or laundry soaps containing chlorine. Waxes and cleaners
containing chlorine, calcium or sodium chloride.
NOTE
After installation, installer must check for correct and safe operation of the heater.
CAUTION
Chemicals should not be stored near the heater installation. Combustion air can be contaminated by corrosive
chemical fumes which can void the warranty.
Corrosive Vapors and Possible Causes
COMBUSTION AIR SUPPLY
For indoor installation, the heater location
must provide sufficient air supply for proper
combustion and ventilation of the surrounding area
(
in accordance with AS/NZS 5263.1.12:2019.
The minimum requirements for the air supply
specify that the room in which a heater is installed
should be provided with two permanent air
supply openings; one within 30 cm (12 in) of
the ceiling, the other within 30 cm (12in) of the
floor for combustion air, in accordance with the
AS/NZS 5601.1 as applicable, and any local
codes that may apply. These openings shall
directly, or through duct, connect to outdoor air.
Pentair does not recommend indoor
installations that do not provide combustion
air from outside the building.
Air Supply Requirements Guide for MasterTemp Heaters
Table 8.
Minimum Net Free Open Area for Each Opening*
(Square Inches/Centimeters)
Model
All Air From Inside Building
All Air From Outside Building
Combustion
Vent
Combustion
Vent
200
200 sq. in.
1290 sq. cm.
200 sq. in.
1290 sq. cm.
50 sq. in.
323 sq. cm.
50 sq. in.
323 sq. cm.
300
325 sq. in.
2097 sq. cm.
325 sq. in.
2097 sq. cm
80 sq. in.
516 sq. cm.
80 sq. in.
516 sq. cm.
400
400 sq. in.
2580 sq. cm.
400 sq. in.
2580 sq. cm.
100 sq. in.
645 sq. cm.
100 sq. in.
645 sq. cm.
*
Area indicated is for one of two openings; one at floor level and one at the ceiling.
