HT# 059299-00 A
• Standby stages are used as back stages in extreme load conditions
• Standby stages can only be activated after all stages in Auto have been
at 100% modulation for the Standby Delay
• A Standby stage can never be a lead stage
• This mode should only be used to test the stage Manual overrides the
System Prove input The exact percent of modulation for a stage can
be set with the Manual mode Once selected, the unit will immediately
turn on and modulate to the selected percentage The stage status will
indicate m50% for the manually set stage
• Any stage without a relay or not connected to a physical unit should be
set to Off
• The Off Mode is also used to disable stages that are in service
• The On mode should only be used when testing a stage This mode
overrides the System Prove input Stages set to On will immediately
modulated to 100%
Manual and On Stage Modes
activate the stages regardless
of the Prove input signal
Do not use the Manual or
On options unless all safety
controls are checked and
adjusted to avoid hazard
situations
- STAGE A MANUAL -
50%
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STAGE MENU/Ignition %
• The Ignition % is the minimum modulation percent for the stage to be
activated See "Modulation Concept" on page 4
• The Ignition % is maintained during the Purge Delay, Soft-Off Delay, and
Last-Stage-Hold
• For most modern power draft units, the Ignition % can be set to 1%
Other units or atmospheric units may require their modulating to be
from 20-50% before the stage can be active Check with the equipment
manufacturer for the minimum ring rate required
------- STAGE A -------
Ignition Point
1%
[
]
STAGE MENU/Mod Start %
• The Modulation Start is the modulation percent at which the lag stage can
be activated See "Modulation Concept" on page 4
• For example, if the Modulation Start for Stage "B" is set to 75%, then
when Stage "A" reaches 75% modulation, Stage "B" is turned on
• When modulation is decreasing, the lag unit will remain at the Ignition %
until the lead stage reaches 40% of its Modulation Start, or 2% above the
Ignition Point, whichever is higher
------- STAGE A -------
Modulation Start
80%
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]
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