Pentair 300, 250 installation manual Indoor Vent Adaptors Fits ALL Models

Installation (Indoor) 17

NOTE

The heater requires two uninterrupted air supply openings; one for ventilation and one to supply oxygen for proper gas combustion. The air supply

b)Construct a non-combustible base from masonry blocks as illustrated, see Figure 14.

openings should be sized according to Table 2.

Air supply requirements below apply to all MiniMax NT Low NOx heaters*.

	REQUIRED AIR SUPPLY
Model	Air for Combustion	Air Ventilation
	Sq. In.	Sq. In.
200	200	200
250	250	250
300	300	300

BASE FOR USE ON COMBUSTIBLE FLOORS

SHEET METAL

BLOCKS

Figure 14.

. Min 6"

. Min 6"

HOLLOW MASONARY BLOCKS, NOT LESS THAN 4" THICK (LAID WITH ENDS UNSEALED AND JOINTS MATCHED FOR AIR CIRCULATION). COVER BLOCKS WITH

24 GA. (MIN.) GALVANIZED SHEET METAL.

400 400 400

Table 2.

*NOTE

The openings listed in Table 2 are free open vent area—if the vents incorporate restrictive louvers, the vent openings must be increased to compensate for the area blocked by the louvers (or grills).

INSTALLATION ON FLOORS CONSTRUCTED OF COMBUSTIBLE MATERIALS

The heater may be placed on a “combustible floor” using either of the two methods listed below:

a)Use Listed Factory Non-combustible Base Kit for use on combustible floors.

Model	Non-Combustible Base Kit
200	471961
250	460509
300	471960
400	460508

CAUTION

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

INDOOR VENT ADAPTORS (FITS ALL MODELS)

The proper draft hood and adapter must be installed on the heater as shown below and on pages 15 and 16:

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

Indoor Vent

Adaptor

Figure 15.

Rev. C 11-1-01 P/N 471593