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 Efficiency
92.3%
Combustion Efficiency
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
¹
The 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.
