Jandy -Low NOx Installation And Operation Manual - page 11
LX and LT Low NOx Pool/Spa Heater
Page 9
The information in Table 3 is not applicable in
installations where exhaust fans or blowers of any type
are used. Such installations must be designed by
qualified engineers.
The heater must be completely isolated and
protected from any source of corrosive chemical
fumes such as those emitted by trichlorethylene,
perchloroethylene, chlorine, etc.
WARNING
Do not store any chemicals, cleaners, or other
corrosive material near combustion air
openings or in the room. Avoid locating
appliance vents in the vicinity of combustion air
openings. Failure to prevent corrosive materials
from mixing with combustion air can result in
reduced heater life and unsafe heater
operation.
AVERTISSEMENT
Ne pas entreposer ni utiliser d'essence ni
d'autres vapeurs ou liquides inflammables à
proximité de cet appareil ou de tout autre
appareil.
3.2 Exhaust Venting
When converted to indoor and outdoor shelter
venting configuration, the LX and LT Low NOx
heaters have a vent collar fitting. The diameter of the
vent collar and, thus, the minimum diameter of the vent
pipe to be used is determined by the model of heater
installed. The only correct procedure for vent pipe
sizing is to do so in accordance with Table 4 and
the applicable installation code as stated in the
following "Danger" warning.
Table 3. Air Openings to Outside
Required Net Free Open Area*
for Combustion Air Openings
Direct from outside
Duct from outside
Model
in
2
(cm
2
)
in
2
(cm
2
)
250-L
63
(406)
126
(813)
400-L
100
(645)
200
(1290)
*Area indicated is for one of two openings; one at floor level
and one at the ceiling, so the total net free area would be double
the figures 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 opening must be at least four times
the area indicated in the table above.
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 flow area for each 2000
BTU/h (0.6 kW). These requirements are summarized
in Table 3. Note that the areas specified are net free
areas and should be increased when the openings are
covered by screens, louvers, grills or other protective
covers (see Figure 8 and Table 3 notes).
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 flue products to accumulate in the
room. Additional air must be supplied to compensate
for such exhaust.
Notes:
1. Use approved
roof jack.
Figure 8. Indoor Installation Venting (USA), or Outdoor Shelter (Canada)
3)