Model LJ Pool and Spa Heater
Page 9
Vent opening should be well away from trees or
other obstructions that would prevent free air flow to
and from vent terminal. Do not terminate the vent
under decks, stairways, or car ports.
Be sure to support all venting so that connections
will not separate and so that the weight of the vent
pipe does not rest on the heater draft hood. All con-
nections should be made with rustproof sheet metal
screws. Do not weld or fasten the vent pipe to the
heater draft hood. The draft hood and heater top must
be easily removable for normal heater service and
inspection.
The draft hood outlet is to be connected to an
unobstructed vent pipe of the same diameter, terminat-
ing outside the building. The vent must terminate at
least two (2) feet (0.6 m) above the highest point of
the roof or other object that is within ten (10) feet (3.0
m) of the vent termination. The vent pipe must have a
listed vent cap which allows a full equivalent opening
for flue products (see Figure 4). The top of the vent
cap must be at least five feet in vertical height above
the draft hood outlet.
Type B double wall or equivalent vent pipe is
recommended. However, single wall metal vent pipe
may be used as specified in the latest edition of the
National Fuel Gas Code ANSI Z223.1 or in Canada
CAN/CGA-B149.1 and B149.2
IMPORTANT NOTE:
Do not use sheet metal
screws at the snap lock joints of Type B gas vents.
When venting multiple appliances through one
common duct, each appliance must have its own
exhaust vent temperature limit switch. All vent
temperature limit switches must be wired in series so
as to prevent all appliances from firing in the event
that any vent opening becomes blocked. Refer to
ANSI Z223.1in the United states or CAN/CGA
B149.1 or .2 for more information on multiple venting.
SECTION 4.
Gas Connections
4.1 Gas Supply and Piping
Review the following general instructions before
continuing the installation.
WARNING
Do not convert this heater from natural gas to
propane gas, or propane to natural without
manufacturer's approval. Unauthorized field
conversion could create carbon monoxide gas
which can cause property damage, serious
injury, or death.
1.
Gas piping installation must be in accordance
with the latest edition of ANSI Z223.1 and all
local codes. In Canada, the installation must be in
accordance with CAN- B149.1 or .2 and all local
codes that apply.
2.
Check the rating plate to make sure the heater is
fitted for the type of gas being used. Jandy
heaters, as shipped from the factory for use in
the United States and Canada, are certified to
operate at altitudes shown in Table 3.
Table 4. Natural Gas Pipe Size Requirements
Distance from Gas Meter
0-50 feet
50-100 feet
100-200 feet
Heater
(0-15 m)
(15-30 m)
(30-60 m)
Size
in. (mm)
in.
(mm)
in.
(mm)
125
3/4
(19)
1
(25)
1
(25)
175
1
(25)
1
(25)
1-1/4
(32)
250
1
(25)
1-1/4
(32)
1-1/4
(32)
325
1-1/4 (32)
1-1/4
(32)
1-1/2
(38)
400
1-1/4 (32)
1-1/2
(38)
1-1/2
(38)
Notes:
1. These numbers are for natural gas (0.65 Sp. Gr.) and are
based on 1/2 inch (13mm) water column pressure drop.
Check supply pressure with a manometer, and local code
requirements for variations. For liquefied petroleum gas,
reduce pipe diameter one size, but maintain a 3/4 inch
(19mm) minimum diameter.
2. Check supply pressure and local code requirements
before proceeding with work.
3. Pipe fittings must be considered when determining gas
pipe sizing.
S
A
G
L
A
R
U
T
A
N
E
D
U
T
I
T
L
A
N
O
I
T
A
N
G
I
S
E
D
D
E
T
I
N
U
S
E
T
A
T
S
A
D
A
N
A
C
E
D
U
T
I
T
L
A
W
O
L
T
F
0
0
0
3
-
0
T
F
0
0
0
2
-
0
)
m
0
1
6
-
0
(
E
D
U
T
I
T
L
A
D
I
M
)
H
(
T
F
0
0
0
6
-
1
0
0
3
T
F
0
0
5
4
-
1
0
0
2
)
m
0
7
3
1
-
1
1
6
(
E
D
U
T
I
T
L
A
H
G
I
H
)
J
(
T
F
0
0
0
,
0
1
-
1
0
0
6
T
O
N
E
L
B
A
C
I
L
P
P
A
P
L
E
D
U
T
I
T
L
A
W
O
L
T
F
0
0
0
5
-
0
T
F
0
0
5
4
-
0
)
m
0
7
3
1
-
0
(
E
D
U
T
I
T
L
A
H
G
I
H
)
H
(
T
F
0
0
0
,
0
1
-
1
0
0
5
T
O
N
E
L
B
A
C
I
L
P
P
A
Table 3. Altitude Designations for the LJ Pool Heater
Caution
Permanent damage to the gas valve will occur
if the following procedures are not followed.
4.
Use the figures in Table 4 to size the gas inlet
piping from the gas meter to the heater. Check
all local codes for compliance before installing
the heater.
