Jandy Legacy LRZM, Installation And Operation Manual

Page 12

Legacy

™

 Model LRZM Pool/Spa Heater Installation and Operation Manual

and combustion air are essential for the safe and 

ef

fi

 cient operation of the heater (See Section 3).  An 

approved draft hood may be purchased from your local 

Jandy distributor. See Section 11 (Parts List) of this 

manual for the correct part number for your model and 

size heater.

Section 3.  Venting

3.1 Combustion 

Air 

Supply

The heater location must provide suf

fi

 cient 

air supply for proper combustion and ventilation of 

the surrounding area as outlined in the latest edition 

of ANSI standard Z223.1 or in Canada, CAN/

CSA-B149.1, and any local codes that may be appli-

cable.

In general, these requirements specify that the 

room in which a heater is installed should be provided 

with two permanent air supply openings; one within 

12 inches (305mm) of the ceiling, the other within 

12 inches (305mm) of the 

fl

 oor. All indoor installa-

tions must have openings to outside air for combus-

tion, ventilation, and dilution of 

fl

 ue gases from inside 

the building (see Figure 5 and Table 3). Zodiac Pool 

Systems, Inc. does not recommend indoor installations 

that do not provide combustion air from outside the 

building.

All outdoor shelter installations (Canada only) 

must have uninterrupted openings to outside air for 

combustion and ventilation. The installation must 

be in accordance with the latest edition of CAN/

CSA-B149.1. Zodiac Pool Systems, Inc. does not 

recommend outdoor shelter installations that depend 

on internal air for combustion. Combustion air should 

be ducted to the heater from outside the structure.

Outside Air Supply:

 When combustion air 

is supplied directly through an outside wall, each 

opening should have a minimum free area of one 

square inch per 4,000 BTU/h (1.2kW) input of the 

total input rating of all appliances in the enclosed 

area. If air is provided through horizontal ducts, each 

opening and duct must provide one square inch of 

fl

 ow 

area for each 2000 BTU/h (0.6 kW). These require-

ments are summarized in Table 3. Note that the areas 

speci

fi

 ed are net free areas and should be increased by 

50 percent when the openings are covered by screens, 

louvers, grills or other protective covers (see Figure 5 

and Table 3).

NOTE

  In Canada, follow Canadian Standard, CAN/

CSA-B149.1 or local codes.

Exhaust Fans or Vents:

 Any equipment 

which exhausts air from the room where the heater 

is installed can deplete the combustion air supply or 

reverse the natural draft action of the venting system. 

This could cause 

fl

 ue products to accumulate in the 

3)

Notes:

1. Use approved 

roof jack.

Figure 5.  Indoor Installation Venting (USA), or Outdoor Shelter (Canada)

Table 3.  Air Openings to Outside

Required Net Free Open Area*

for Combustion Air Openings

*Area indicated is for one of two openings; one at 

fl

 oor level and 

one at the ceiling, so the total net free area would be double the 

fi

 gures indicated. For special conditions, refer to NFPA54 ANSI 

Z223.1. 

In Canada refer to the National Standard CAN/CSA-

B149.1 which differs from this table.

Note: If using screens and/or metal louvers, compensate by adding 

50% additional area to each opening.  If using wood louvers each open-
ing must be at least four times the area indicated in the table above.

Model

Direct from outside

Duct from outside

in

2

cm

2

in

2

cm

2

125

32

206

64

413

175

44

284

88

568

250

63

406

126

813

325

82

429

164

1058

400

100

645

200

1290