Pentair NT Series installation manual Combustion AIR Supply, Vent Adaptors, Fits ALL Models

Section III. Installation 16

COMBUSTION AIR SUPPLY

For indoor installation, the heater location must provide sufficient air supply for proper combustion and ventilation of the surrounding area.

The 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 12 inches of the ceiling, the other within 12 inches of the floor. These openings shall directly, or through duct, connect to outdoor air.

Pentair Water Pool and Spa, Inc. does not recommend indoor installations that do not provide combustion air from outside the building.

Air Supply Requirements Guide

for MiniMax NT Heaters

Net Free open Area for

Each Opening * (Square Inches)

Heater	Ducted from	Direct from
Size	Outside	Outside
200	100	50
250	125	63
300	150	75
400	200	100

*Area indicated is for one of two openings; one at floor level and one at the ceiling.

NOTE: If using louvered type or screen type openings, check with Louver/Screen Manufacturers to correct for the Louver/Screen resistance.

Table 12.

CAUTION

Chemicals should not be stored near the heater installation. Combustion air can be contaminated by corrosive chemical fumes which can void the warranty.

VENT ADAPTORS

(FITS ALL MODELS)

The proper vent adaptor must be installed on the heater as shown below in Figure 9.

Product No.	Vent Dia.
460506	4 in.
460507	5 in.

Vent

Adaptor

1.Remove the six (6) retaining screws from the old exhaust grill and discard the screws, gasket, and exhaust grill as shown in Figure 10.

EXHAUST GRILL

SCREWS (6)

GASKET

Figure 10.

2.Install the Vent Adaptor as shown in Figure 11. Make sure the holes in the gasket, metal flange of the main vent assembly, and heater cover are aligned before securing into place using the six (6) screws provided in the Vent Adaptor Kit.

METAL FLANGE

SCREWS (6)

GASKET

Figure 9. Figure 11.

P/N 472235 Rev. E 4-15-05