Pentair MT125 - Combustion Air Supply

460906 Rev. D 8/2020 MASTERTEMP 125 Pool and Spa Heater Installation and User’s Guide
31
Section 1. Installation Instructions
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 sufcient 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 oor 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 the MasterTemp 125 Heater
Table 8.
Minimum Net Free Open Area for Each Opening*
(Square Inches/Centimeters)
Model
All Air From Inside BuildingAll Air From Outside Building
Combustion Vent Combustion Vent
125
200 sq. in.
1290 sq. cm.
200 sq. in.
1290 sq. cm.
50 sq. in.
323 sq. cm.
50 sq. in.
323 sq. cm.
* Area indicated is for one of two openings; one at floor level and one at the ceiling.