DIMENSION, inches
Main Gas " A " fpt flanged
pressure tap 1 / 4 " NPT Gas
½ " NPT for Flame Rod or UV cell, interchangeable with Ob- servation Port opening
Low Fire Gas ½ " NPT
pressure tap ¼ " NPT Air
5' spark igniter cable
U
K
5' spark igniter cable
2" Obs. Port
¾ " fpt for UV inside burner housing
Y
+ –
4988- 9000-L only
H
U
adj. port cock
½ " Obs. Port
" B " number of holes, " C " dia. on " D " bolt circle S
J
Low Fire Gas ½ " NPT
T
Main Gas " A " NPT
pressure tap ¼ " NPT Gas
pressure taps ¼ " NPT Air
K
E F §
4988-1000 thru -6000
X
R
H
pressure tap ¼ " NPT Air
N
L
P
M
J
S
G Z
3.0"
4988- -R Burner Size 1000 = 4" (4.50" O.D.) 2500 = 6" (6.63" O.D.) 4000 = 8" (8.63" O.D.) 6000 = 10" (10.75" O.D.) 9000 = 12" (12.75" O.D.)
Zephyr
dimensions in inches
F
G L †
G H‡
H L †
H H‡
J L †
J H‡
K
L
M
N
designation A B
C
D
E §
1 ¼
11⁄32 13⁄32 13⁄32 13⁄32
9 ½
10 5⁄8 15 3⁄16 19 ¾ 19 ¾ 27 3⁄8
24 3⁄16 32 3⁄8 42 ¼ 42 ¼ 54 ¾
25 13⁄16 36 5⁄16 42 ¼ 49 7⁄8
7 ½
8 7⁄8 12 1⁄8 12 1⁄8 17 1⁄8
9 13⁄16 11 9⁄16 12 13⁄16 13 9⁄16
9 7⁄8 12 3⁄8 14 9⁄16 16 1⁄8
6 ½ 8 5⁄8 10 7⁄8 10 7⁄8 17 1⁄8
5 5⁄8
2 ¼ 4 1⁄8 4 ¼ 4 ¼
8
8 1⁄16 12 1⁄8 16 1⁄8 16 1⁄8 22 ¼
5
4988-1000 4988-2500 4988-4000 4988-6000 4988-9000
8 13⁄16
6 ½
2 3 3 4
12 16 16 12
13 13⁄16 18 1⁄8 18 1⁄8 25 ½
10 3⁄16 11 ¼ 11 ¼ 15 ½
12 1⁄8 12 1⁄8 17 1⁄8
10 10
5⁄8
16 1⁄8
—
—
—
10 5⁄16
—
4988- -R
Obs. Port
weight, lb
SW style connection pipe size (inches)
Zephyr
For -L Only
S H‡
T
U
X
Y
Z
4988-L 4988-H 4988-R
designation P
R
S L †
4988-1000 10 ¾ 4988-2500 15 13⁄16 4988-4000 18 1⁄8 4988-6000 18 1⁄8 4988-9000 22 11⁄16
¾
1⁄8
3 ¼ 3 7⁄8
3 ¾ 15 1⁄16 4 ¾ 20 7⁄8
5 13⁄16 6 1⁄16 8 9⁄16 8 9⁄16
5 9⁄16 7 5⁄16 7 9⁄16 9 ¼
7
8790-0 8790-0
45 88 137 142
52
24 57 96 96
4 A round
1 1⁄8 1 ¼ 1 ¼
9 ¼ 11 ¼ 11 ¼
117 181 221
6 SW connection,
3⁄16 3⁄16 3⁄16 3⁄8
5 9⁄16 6 5⁄8 24 13⁄16 8790-0 5 9⁄16 6 5⁄8 24 13⁄16 8790-0
8 suitable for
10 flexible sleeve or 12 welded connection
— 9 ¼
13 7⁄8 6 9⁄16 9
33 ½
—
8790-4-A 300
—
180
§ Allow at least 6" on each side to withdraw flame supervisory device or spark igniter. † 4988- -L only.
Bulletin 4988 Page 4
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