Zephyr
dimensions in inches
designation A B C D
E
§
F G
L†
G
H‡
H
L†
H
H‡
J
L†
J
H‡
K L M N
4988-1000
1
¼
8
11⁄32
9
½
10
5⁄8
8
1⁄16
24
3⁄16
25
13⁄16
7
½
8
7⁄8
9
13⁄16
9
7⁄8
6
½
5
5⁄8
5 2
¼
4988-2500
2 12
13⁄32
13
13⁄16
15
3⁄16
12
1⁄8
32
3⁄8
36
5⁄16
8
13⁄16
12
1⁄8
11
9⁄16
12
3⁄8
8
5⁄8
10
3⁄16
6
½
4
1⁄8
4988-4000
3 16
13⁄32
18
1⁄8
19
¾
16
1⁄8
42
¼
42
¼
12
1⁄8
12
1⁄8
12
13⁄16
14
9⁄16
10
7⁄8
11
¼
10 4
¼
4988-6000
3 16
13⁄32
18
1⁄8
19
¾
16
1⁄8
42
¼
49
7⁄8
12
1⁄8
17
1⁄8
13
9⁄16
16
1⁄8
10
7⁄8
11
¼
10 4
¼
4988-9000
4 12
5⁄8
25
½
27
3⁄8
22
¼
54
¾
— 17
1⁄8
— 16
1⁄8
— 17
1⁄8
15
½
10
5⁄16
—
4988- -R
Zephyr
For -L Only
Obs.
weight, lb
SW style connection
designation P R S
L†
S
H‡
T
U
X
Y
Z
Port
4988-L 4988-H 4988-R
pipe size (inches)
4988-1000
10
¾
¾
5
13⁄16
5
9⁄16
1⁄8
7
3
¼
3
¾
15
1⁄16
8790-0
45
52
24
4 A round
4988-2500
15
13⁄16
1
1⁄8
6
1⁄16
7
5⁄16
3⁄16
9
¼
3
7⁄8
4
¾
20
7⁄8
8790-0
88
117
57
6 SW connection,
4988-4000
18
1⁄8
1
¼
8
9⁄16
7
9⁄16
3⁄16
11
¼
5
9⁄16
6
5⁄8
24
13⁄16
8790-0
137
181
96
8 suitable for
4988-6000
18
1⁄8
1
¼
8
9⁄16
9
¼
3⁄16
11
¼
5
9⁄16
6
5⁄8
24
13⁄16
8790-0
142
221
96
10
fl exible sleeve or
4988-9000
22
11⁄16
— 9
¼
—
3⁄8
13
7⁄8
6
9⁄16
9 33
½
8790-4-A
300
—
180
12 welded connection
§ Allow at least 6" on each side to withdraw fl ame supervisory device or spark igniter.
† 4988- -L only.
½
" NPT for Flame Rod or UV
cell, interchangeable with Ob-
servation Port opening
5 spark
igniter cable
½
" Obs. Port
adj. port
cock
Low Fire Gas
½
" NPT
T
F
E
§
M
N
L
P
G
pressure
tap
¼
" NPT Air
pressure taps
¼
" NPT Air
S
J
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.)
H
K
pressure tap
¼
" NPT Gas
4988-1000
thru -6000
R
"
B
" number of holes, "
C
" dia.
on "
D
" bolt circle
S
J
H
4988-
9000-L
only
¾
" fpt for
UV inside
burner
housing
5 spark
igniter
cable
pressure tap
¼
" NPT Air
pressure tap
1
/
4
" NPT Gas
Main Gas
"
A
" fpt fl anged
U
Low Fire Gas
½
" NPT
2" Obs.
Port
K
U
Main Gas
"
A
" NPT
Z
3.0"
Y
X
Bulletin 4988
Page 4
+
–
DIMENSION, inches
