F
0.6"-1"
1.3"
19.5"
28.2"
8.5"
45"
40.1"
8.7"
8.5"
24.2"
3.9"
AA
VK
GAS
RK
ST
B
AL
RK
XRK
XAA
YAA
AKO
55.1"
59.7"
A
TM
Front View
Side View
Rear View
Top View
GB312 Series
Model
GB312/90
GB312/120
GB312/160
GB312/200
GB312/240
GB312/280
Performance Data
Gas Input (MBH)
328.3
440.5
588.3
732.6
880.7
1,028.8
Gross IBR Output (MBH)
305
409
544
676
810
944
Input at Minimum Capacity
132
132
176
220
264
309
Output at Minimum Capacity
131
131
173
217
261
306
Net IBR Rating (MBH)
265
356
473
588
705
821
Thermal Efficiency
93.1%
92.8%
92.5%
92.3%
92.0%
91.7%
Combustion Efficiency
93.4%
93.1%
92.8%
92.5%
92.2%
92.0%
Boiler Horse Power
9.1
12.2
16.2
20.2
24.2
28.2
Fireside Pressure Drop (Inch WC)
0.49
0.63
0.89
0.97
1.22
1.44
MAWP (PSI)
50
50
50
50
50
50
Minimum Gas Pressure (Inch WC)
3½
3½
3½
3½
3½
3½
Maximum Gas Pressure (Inch WC)
10½
10½
10½
10½
10
10½
Operating Temperature
180˚F
180˚F
180˚F
180˚F
180˚F
180˚F
Maximum Temperature Limit
200˚F
200˚F
200˚F
200˚F
200˚F
200˚F
Piping Connections
Flue Pipe Diameter (
AA
)
6"
6"
6"
8"
8"
8"
Dimension (
YAA
)
18½"
18½"
18½"
19½"
19½"
19½"
Dimension (
ZAA
)
5¾"
5¾"
5¾"
12¼"
12¼"
12¼"
Combustion Air Pipe Diameter (
AL
)
4"
4"
4"
4"
4"
4"
Connections (
VK
and
RK
)
2½" NPT
2½" NPT
2½" NPT
2½" NPT
2½" NPT
2½" NPT
Connection (
ST
) (B-kit)
¾" NPT
¾" NPT
¾" NPT
¾" NPT
¾" NPT
1" NPT
GAS
Connection Size
1" NPT
1" NPT
1" NPT
1¼" NPT
1¼" NPT
1¼" NPT
Physical Dimensions
# of Heat Exchanger Sections
4
4
5
6
7
8
Dimension (
XAA
)
13
1
/
8
"
13
1
/
8
"
15
1
/
8
"
17¼"
19¼"
21¼"
Dimension (
XRK
(=
XAL
=
GAS
)
10
5
/
8
"
10
5
/
8
"
14¾"
10
5
/
8
"
14¾"
10
5
/
8
"
Dimension (
A
)
51½"
51½"
51¼"
51¼"
51¼"
51¼"
Height
59¾"
59¾"
59¾"
59¾"
59¾"
59¾"
Width (
B
)
39
1
/
8
"
39
1
/
8
"
47
3
/
8
"
47
3
/
8
"
55½"
55½"
Boiler Feet Spacing (
F
)
31½"
31½"
39¾"
39¾"
48"
48"
Dry Weight (lbs.)
455
455
530
585
665
730
Approx. Water Content (gal.)
4.2
4.2
5.3
6.3
7.1
7.9
ØAA
- Flue Connection
GAS
- Gas Connection
ST
- Safety Valve Connection
AL
- Combustion Air Pipe
VK
- Boiler Supply
TM
- Pressure / Temperature Gauge
AKO
- Condensate Drain
RK
- Boiler Return