A.O. Smith ProLine XE GPDNL-40 Series Installation And Operating Manual page 33

WATER HEATER
VENT SIZE (INSIDE
HEATER INPUT
MODEL (BTU/HR)
40 gal. 40k
50 gal. 40k (See Figure 44)†
40 gal. 40k
(See Figure 45)
50 gal. 40k
40 gal. 40k
50 gal 40k (See Figure 46)
* see Figure 38 and Table 5.
† Requires 2" kit 100086430.
Notes:
1. A horizontal vent must have a 45° or 90° vent termination elbow to direct the vent pipe downward unless
otherwise specified by local requirements.
2. A vertical vent must have a 90° elbow to direct the vent pipe horizontally followed by a vent termination 45°
elbow to direct the vent pipe downward unless otherwise specified by local requirements.
3. If additional elbows are used in the vent system the allowable vent lengths are reduced.
4. Two 45° elbows are considered the equivalent of one 90° elbow.
5. The pressure switch settings listed are only for installations at altitudes of up to, and includeing, 5,400'. For
operation at elevations above 5,400' but below 10,100', the heater requires a "Hi-Altitude Kit" (P/N 100308933).
HEATER VENT
WATER
INPUT SIZE
HEATER
(BTU/ (INSIDE
MODEL
HR) DIAM.)
40 gal. 40k
3" (See
Figure 45)
50 gal. 40k
* see Figure 38 and Table 5.
Notes:
1. A horizontal vent must have a 45° or 90° vent termination elbow to direct the vent pipe downward unless
otherwise specified by local requirements.
2. A vertical vent must have a 90° elbow to direct the vent pipe horizontally followed by a vent termination 45°
elbow to direct the vent pipe downward unless otherwise specified by local requirements.
3. If additional elbows are used in the vent system the allowable vent lengths are reduced.
4. Two 45° elbows are considered the equivalent of one 90° elbow.
5. The pressure switch settings listed are only for installations at altitudes of up to, and includeing, 5,400'. For
operation at elevations above 5,400' but below 10,100', the heater requires a "Hi-Altitude Kit" (P/N 100308933).
100324051_2000579115 _Rev. 01
PRESSURE
SWITCH
SETTINGS
DIAM.)
(in. W.C.)
N.C. N.O.
-1.8
2"
-0.75
-2
-1.8
3"
-0.75
-2
-1.8
4"
-0.75
-2
PRESSURE
LOW PROFILE
SWITCH
EQUIV. VENT
SETTINGS
LENGTH
(in. W.C.)
N.C. N.O. MAX.
-1.8
75' plus
term. and
restrictive
-0.75 screen*
-2
on both
intake and
exhaust
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2 PIPE
EQUIV. VENT LENGTH
MAX. MIN.
7' plus term. elbow
50' plus term.
and restrictive
elbow and
screen* on both
debris screen*
intake and exhaust
125' plus 7' plus term. elbow
term. elbow and restrictive
and restrictive screen* on both
screen* intake and exhaust
180' plus term. 50' plus term.
elbow and elbow and debris
debris screen* screen*
Table 6.
PYRAMID
EQUIV. VENT LENGTH
MIN. MAX.
7' plus
term. and
7' plus term.
restrictive 50' plus
and restrictive
screen* term. and
on both restrictive
both intake and
intake screen*
and
exhaust
Table 7.
CONC. VENT
EQUIV. VENT LENGTH
MAX.
45' plus term.
and debris
screen*
n/a
n/a
MUSHROOM
EQUIV. VENT LENGTH
MIN. MAX.
7' plus term.
50' plus
and restrictive
term. and
screen* on
restrictive
screen*
exhaust and exhaust
MIN.
7' plus
term. and
restrictive
screen* on
exhaust only
n/a
n/a
MIN.
screen* on
both intake
33