Buderus GB312/200 User manual

GB312/200 Gas Condensing Boiler
Engineering
Submittal
Sheet
GB312/200 Performance Data
Gas Input (MBH) 732.6
Gross IBR Output (MBH) 676
Input at Minimum Capacity (MBH) 220
Output at Minimum Capacity (MBH) 217
Net IBR Rating (MBH) 588
Thermal Efciency 92.3%
Combustion Efciency 92.5%
Boiler Horse Power 20.2
GB312/200 Operational Data
Number of Heat Exchanger Sections 6
Dry Weight (lbs.) 585
Approx. Water Content (gal.) 6.3
Min Inlet Gas Pressure NG ("WC) 3.5
Max Inlet Gas Pressure NG ("WC) 10.5
Max High Limit Temperature (°F) 200°F
Fireside Pressure Drop (Inch WC) 0.97
Flow Rate at 18°F ∆T (GPM) 75
Flow Rate at 36°F ∆T (GPM) 37
Max Working Pressure (psi) 50
Relief Valve Rating (MBH) 1,418
Relief Valve Pressure Rating (psi) 50
Max Flow Temp Heating/DHW (°F) 172/180
Max equivalent exhaust vent length (ft) 100
Max equivalent combustion air vent length (ft) 100
Venting Category IV
Approved Venting Materials CPVC¹ ²,
AL29-4C
¹The following system is approved for use in U.S.A and may be
used with this boiler:
Spears - CVPC pipe to Schedule 80 ASTM D1784
² The following system is approved for use in Canada and may
be used with this boiler:
IPEX - System 636 CPVC (available in 4" only)
GB312/200 Electrical Specifications
Electrical Voltage Mains 120V/60Hz
Electrical Voltage Controls 24V
Power Consumption Max Load (A) 1.91
Power Consumption Min Load (A) 0.41
Max Permissible Fuse Rating (A) 10
GB312/200 Clearances
Minimum Clearance
to Combustibles
(Inch)
Wall Clearance
Recommended (Inch)
Front 20 28
Rear 22 28
Side 20 28
Flue pipe to wall 6 14
Additional Information
• Outdoor reset AM10 standard with outdoor sensor
• DHW priority MC10/BC10 standard (DHW sensor not
included)
• Modulating premix burner
• Direct-vent sealed combustion
• Direct ignition by hot surface igniter
• Adjustable leveling legs
• 50 psi relief valve
Options
• CSD-1 kit (high gas pressure switch / low gas pressure
switch)
• Condensate neutralization tank (NE–0.1)
• Logamatic 4323 Control
- Sequencing up to 8 boilers
- System and zoning control for pumps and valves
- solar integration
- plate and frame heat exchanger control
• CM10 two boiler module
• EM10 BMS integration 0-10V input stand alone control
• Low water cutoff
• High temperature manual reset
• DHW sensor
Note: Refer to applications manual for specific information on venting,
piping, electrical connections and pump sizing.

|GB312/200 Gas Condensing Boiler | Engineering Submittal Sheet
Data subject to change without notice | GB312/200-SS-RevA 03/2008 Buderus
Bosch Thermotechnology Corp.
50 Wentworth Ave
Londonderry, NH 03053
Tel: [phone]
Fax: [phone]
www.buderus.net
GB312/200 Piping Connections/Specifications
ØAA Flue Connection Diameter 8"
AL Combustion Air Pipe Diameter 4"
AG GAS Connection Size 1¼" NPT
RK/VK Boiler Return & Supply Connections 2½" NPT
ST Relief Valve Connection (B-kit) ¾" NPT
GB312 B-Kit Assembly with Flow Check Valve
ITEM DESCRIPTION QTY
1 2½" Flange to boiler 2
2 ½" Female NPT 1
3 ¾" Female NPT 3
4 ¾" Female NPT 1
5 1" Female NPT 1
6 2½" - Check Valve 1
7 2½" - Female NPT Mating Flange to system 1
GB312 B-Kit Assembly with Flow Check Valve
8⅛"
1'− 6"
1'− 2½"
6½"
4⅛"
5⅛"
7½"
Far
Side
Far
Side
1 1
3
2
3
3
4
6
5
7
View A–A
GB312/200 Top View
VK
8½''
17¼''
47⅜''
VK -Boiler Supply
ST -Safety Valve Connection RK -Boiler Return
AG -Gas Connection
10⅝''
TM -Pressure/Temperature Gauge
TM
RKAG
8¾''
4''
24¼''
40⅛''
45''
59¾''
55⅛''
19½''
VK -Boiler Flow AL -Combustion Air Pipe
ØAA -Flue Connection RK -Boiler Return
AKO -Condensate Drain Knock Out
AG -Gas Connection
8¾''
¾
4''
24
¼
'
'
40
⅛
''
45''
59
¾'
'
55
⅛
'
'
19
½
''
VK -Boiler Flow AL -Combustion Air Pi
pe
Ø
AA -Flue Connection RK -Boiler Retur
n
A
KO -Condensate Drain Knock Ou
t
AG
-
G
as
C
onnection
GB312/200 Rear View
39¾'' ½- 1''
TM
28¼''
19½''
1¼''
51¼''
TM
28¼''
19½''
19½
19½'
1
¼''
5
1
¼''
GB312/200 Side View
TM -Pressure/Temperature Gauge
A-A -B-Kit Assembly with Flow Check Valve
18''
A-A