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Model LG & LD Pool and Spa Heater
Page 3
Notes:
1. An Underwriters' Laboratories listed vent cap is required to prevent downdraft and allow the heater to function properly
and safely.
2. Use approved roof jack.
When a drafthood is used, it must be connected to
a vent pipe which stops at least 2 feet (0.61 meters
[m]) above the highest point of the roof or other object
that is within 10 feet (3.05 m) from the vent termina-
tion. The vent pipe must have a listed vent cap which
allows a full equivalent opening for flue products (see
Figure 2).
2C. Site Location
WARNING
Improper installation or maintenance can
cause nausea or asphyxiation from carbon
monoxide in flue gases which could result in
severe injury, or death.
2C-1. Installation Information
Avoid placing the heater in locations where it can
cause damage by water or condensate leakage. If this is
not possible, provide a suitable drain pan to catch and
divert any leakage. The pan must not block natural
flow of air around the heater.
Locate the heater so the clearances from combus-
tible surfaces shown in Table 2 are met.
Table 2. Minimum Heater Clearances From Combustible Surfaces
Figure 2. Indoor Installation Venting (USA), or Outdoor Shelter (Canada).
Table 1. Air Openings to Outside.
Side of Heater
Indoor (Outdoor Shelter) Installation Outdoors Installation
U.S. Canada U.S. Canada
inch cm inch cm inch cm inch cm
Blank 6 15.2 6 15.2 6 32 6 15.2
Rear 6 15.2 6 15.2 6 32 6 15.2
Piping 12 30.5 18 45.7 12 30.5 18 45.7
Top 44 111.7 44 111.7 Open Unroofed Area
Front 18 45.7 36 91.4 18 45.7 36 91.4
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Required Net Free Open Area
for Combustion Air Openings
Direct from outside Duct from outside
Model 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)
Note: If using screens and/or louvers, compensate by adding 50%
additional area to each opening.