Harsco Industrial MACH C1500GG Installation & Owner's Manual page 35

3.11.1 Combustion Setup and Adjustment
Boiler Test Mode for High and Low fire:
Set the combustion using the Service Menu BNR ON TEST HI & BNR ON TEST LOW modes. These test modes
should be used when checking and setting the gas safety shut off / control valves on the MACH® boiler. In this mode
a heat request is required. Once the boiler cycles on, use the arrow keys to access the Service Menu and select the
BNR ON TEST HI/LOW mode and push enter. Then select BNR ON TEST HI or the BNR ON TEST LOW mode and
push enter. The boiler will ramp to high or low fire.
NOTICE! There must be sufficient load to operate the boiler at high fire to perform the following adjustments. Start
the boiler and observe proper operating parameters for the system.
3.11.2 Gas Valve Adjustment
Open front door on the right side of the boiler. The two gas valves are located inside the cabinet on the left. Each
valve is labeled and adjusted for a specific fuel. The gas valve in the rear is for NATURAL GAS ( NG). The gas valve
in the front is for PROPANE GAS (LP). Check the combustion using a combustion analyzer and adjust the fuel/air
ratio of the valve being used according to the procedures below. For initial startup, both Natural Gas and then
Propane should be fired and the combustion of each should be adjusted individually.
NATURAL GAS (NG)
VALVE
LED indicators
MACH® C1500GG/C2000GG
Automatic Gas Valves
Required Tools: TORX® T40 or 5 mm hex wrench, 3 mm or 7/64
in hex wrench, Combustion analyzer
Start the boiler and observe proper operating parameters for the
system. The combustion analyzer probe should be placed in the
stack outlet to measure the combustion parameters. The MACH
boilers are equipped with a combined gas/air control and gas safety shut off control valves. The valve functions with
the variable speed combustion blower to supply the correct gas air ratio for optimum performance and efficiency.
PROPANE (LP) VALVE
LED indicators
Page 35
C1500/C2000 Adjusting Screws for
Low and High Fire
Low fire adjustment
®
MACH® Gas-Fired Boiler
High fire adjustment