Anti-Cycling Controls - Watts AERCO Edge [ii] Operation Manual

Edge [ii] Controller Operation Manual
SECTION 6 – ADVANCED SETUP
Skip Range Cntr, Skip Range Span, Skip Speed: Together, these three
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parameters can be used to define a Fire Rate "skip zone" the Controller will avoid (Skip
Range Cntr = the center of the range). These can be used in the rare instance when a
unit emits an objectionable noise at a certain Fire Rate and no other remedy resolves the
problem. The Controller will then skip-over the "skip" Fire Rate.

Anti-Cycling Controls

The Anti-Cycling Controls screen provides parameters that can be used to reduce
unnecessary cycling on this unit only.
Main Menu → Advanced Setup → Performance → Fire Control → Anti-Cycling
1. Go to:
Controls.
Figure 6.6.3.4: Fire Control: Standalone Anti-Cycling Controls
2. The following anti-cycling parameters are available, which can be used to delay the
shutdown of a boiler in order to reduce excessive cycling:
On Delay: Specifies the minimum length of time a unit must stay off after shutting
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down or going into standby. (Range: 0 to 600 sec.)
Slow Shutdown: Enable/Disable the slowdown of unit shut down when Off Delay
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threshold is achieved. If Enabled, the following additional parameters appear:
o Off Delay: Defines a Shutoff delay, during which the unit remains at minimum
fire rate after the unit has sequenced to shutoff. It is activated only when Off
Delay Threshold is reached. (Range: 0 to 9999 secs, Default = 1 min.)
o Off Delay Threshold: Fire rate that activates Off Delay function
(Range: 40 to 100 %, default = 60%).
Shutoff Delay Temp: Specifies the number of degree above setpoint which the
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outlet temperature can rise without triggering a unit shut down (Range: 0 to 25°F).
Demand Offset: This parameter reduces excessive ON/OFF cycling in AUTO
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mode. When this entry ≠ 0, the unit will not turn on again until Valve Position In
reaches the Start Level value AND the outlet temperature goes below Demand
Offset. In addition, the boiler will fire at the ignition Valve Position level or below for a
period of one minute. When this entry is set to zero, the unit will turn on again as soon
as the Valve Position In reaches the Start Level value. There will not be a one-
minute delay when firing at the 29% valve position level.
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OMM-139_E 8/25/2020
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