Step 2: Blower Option Selection; Step 3: Control Methodology - Eclipse AH-MA DualBlock Design Manual

Air Flow Switch
The air flow switch provides a signal to the monitoring
system when there is not enough air pressure from the
blower. If a switch is selected, it will be factory mounted.
■ Eclipse supports the NFPA regulation requiring, as
a minimum standard for main gas shut-off
systems, the use of an air pressure switch in
conjunction with other system components.

Step 2: Blower Option Selection

NOTE: Standard blower options are listed in List 163,
additional blower options are available through Eclipse,
and leadtime may vary.
Power Supply Frequency
Select 50Hz or 60Hz. Blower Motors are 50Hz IEC
compliant and CE marked. 60 Hz motors have NEMA
frames and are marked UL/CSA.
Blower Motor Type
Motor types include various options: voltages, single or
three phase.
If the chamber pressure is very negative, a three phase
motor ensures a smooth start
Blower Inlet
When selecting an inlet, consider the following:
• Amount and size of particles in the air
• Sound level requirements
• Space limitations
• Cleanliness requirements of the process
Motor Orientation
Left-hand blower motor orientation is considered
standard. If you need to install right-hand blower motor
orientation, please contact Eclipse.
Remote Blower Sizing
For remote blower applications, the blower should be
sized to supply sufficient flow and pressure to the burner
to ensure proper burner performance.
Datasheet 163 shows the blower input required for each
burner model.
Air Filter
AH-MA DualBlock burners can be supplied with the
following air filter options:
• Air inlet with adjustment and protection grid.
• Air filter with internal flow adjustment.
8
WARNING

Step 3: Control Methodology

Input is normally controlled by a motorized butterfly valve
in the gas line to the burner.
Gas Flow
Air Combustion Blower
(Left-hand Configuration)
Figure 3.1 Burner Basic Components.
A control signal is sent from a process temperature
controller (bought separately) to the control motor. (Refer
to Bulletin 163 or contact Eclipse Combustion for further
information on temperature controllers.)
Process
Set Point
Controller
Process
Figure 3.2 Basic Control Loop.
The control motor modulates the gas butterfly valve (BV)
which controls the fuel flow to the burner.
Air pressure and flow in the burner body remain fixed
throughout the operating range.
Modulation of fuel flow only, provides turndowns of 40:1.
■ Do not use other control methods without prior
approval from Eclipse.
Eclipse AH-MA DualBlock Burner, V2, Design Guide 163, 6/19/2012
Control Motor
Gas Flow
BV Valve
Air Flow Internal
Adjustment Filter
Control
Control
Motor
Signal
Gas Flow
WARNING
Gas
BV