Natural Gas - ECR International CCB-150 Manuel D'installation, D'utilisation Et D'entretien

9.6 Check Combustion and Input Rate

Natural Gas

1.
Measure input rate. Turn off gas to all other
appliances.
• Activate some heating zones to dissipate heat.
• Set boiler on high fire. Wait 10 minutes for boiler
to stabilize.
• Use ½, 1 or 2 cu ft dial on gas meter. Measure
time required for one or more complete
revolutions. Measure time for 1-2 minutes.
• Calculate input.
Input (MBH) =
Example: Gas flow from
Meter = 2 cu ft
Measured time = 72 seconds
Rate (MBH) =
Two sampling test ports are available at top of the boiler, one
for venting and the other for combustion air. See Figure 18
To sample:
• Open the air/vent outlet plug.
• Insert probes all the way in.
• Turn on TEST mode, wait 10 minutes for boiler to
stabilize;
• Take measurement. See Table 6.
Figure 19 - Gas Valve
A Pressure point upstream
B Pressure point downstream
C Modureg electrical connection
D Protection cap
E Minimum pressure adjustment
F Modureg
G Maximum pressure adjustment
I Gas valve electrical connection
N Compensation tube
9 - START UP PROCEDURE
3600 x cu ft
seconds
3600 x 2 cu ft
= 100 MBH
72 seconds
E
G
Figure 18 - Test Ports
Vent Gases
Test Port
Combustion Air Test
Table 6 - Combustion Table
Combustion Minimum/Maximum
High Fire - CO
2
Low Fire - CO
2
N
F
C
D
25 25
Port
Natural Gas
at 100 (%) 7.3 - 7.8
at 33 (%) 3.0 - 5.0
N
C
D
I
A
B
EN
EN