Midco International Inc.
11
8471 34
Installation
___________________________________
Burner operation depends on the unit control setup in which the HMA-2 & 2A burner is used. A
typical setup should consist of a Flame Safety Control with appropriate air
fl
ow proving system and
a Modulating Gas Control System.
1. Verify the pressure across the burner. The pressure across the burner can be measured by
placing two static pressure probes, one downstream and one upstream of the pro
fi
le opening
and measure the di
ff
erential pressure. The pressure should be within burner operating
speci
fi
cations and within the expected calculated pressure. See Chart 2
2. With the burner o
ff
check the Flame Safety Air Proving System
a. Check the operation of the air proving system for low and high air
fl
ow setting. Refer to
the
Speci
fi
cations of the Flame Safety Control for setup instructions and air switch
operational
characteristics.
Burner Setup
Typical Gas Train Assembly
Continued
Figure 5b
- Direct Spark Gas Train Assemblies
Main Manual
Gas Valve
Combination Gas
Valve with Main
& Pilot Regulator
Modulating Valve
Manual Firing Valve
Union
*
Burner
Pilot
Flame Rod
Spark Rod
Direct Spark Ignition Typical
Gas Train Assembly 400,000 BTU/Hr
and Under
Main Manual Gas Valve
Main
Regulator
Main Operating
Valves
Safety Shut-off
Valve
Manual Pilot Valve
Pilot Regulator
Pilot Gas Pressure Tap
Modulating Valve
Main Gas
Pressure Tap
Manual Firing Valve
Union
*
Burner
Pilot
Flame Rod
Spark Rod
Direct Spark Ignition
Typical
Gas Train Assembly
