Temperature Control - Watts AERCO Edge [ii] Operation Manual

Edge [ii] Controller Operation Manual
SECTION 6 – ADVANCED SETUP
2. The following parameters are available:
On Delay: Minimum length of time a unit must stay off after shutting down or going
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into standby. (Range: 30 to 300 sec.)
Slow Shutdown: Enable/Disable the Slow Shutdown feature. Once enabled on a
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unit, if the unit is run at a fire rate above Off Delay Threshold and then shut down,
the fire rate will be reduced to the Stop Level for a period of time defined in Off
Delay. This feature prevents units running at high fire rates from being quickly turned
off and flushed with cold water, thereby possibly damaging the heat exchanger. Once
enabled, the following additional parameters appear:
o Off Delay: Specifies the amount of time the full shut down will be delayed when
Slow Shutdown is enabled. (Range: 0 to 9999 sec.)
o Off Delay Threshold: The threshold fire rate above which the Slow
Shutdown feature will take effect. (Range: 40 to 100%)
Shutoff Delay Temp: Specifies the temperature above setpoint the unit may rise to
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during delay shutdown. (Range: 0°F to 25°F)
Demand Offset: Offset temperature from setpoint before a unit may come online.
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(Range: 0°F to 25°F)

Temperature Control

The Temperature Control screen provides parameters that can be used to fine-tune the
temperature responsiveness and limitations under which the plant operates.
NOTE:
This screen is available only after BST Cascade functionality has been enabled (see the
Unit Mode parameter in
a BST Manager, the parameters apply to this unit and all BST Client units. If the unit is
configured as a BST Client, the parameters configured on the BST Manager will take
precedence.
Main Menu → Advanced Setup → BST Cascade → Operating Controls →
1. Go to:
Temperature Control.
Figure 6.3.4.3 Operating Controls: Cascade Temperature Control Screens
2. The following parameters appear (SH = Space Heating, DHW = Domestic Hot Water):
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OMM-139_E 8/25/2020
Section 6.3.1: Cascade
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Configuration). If the unit is configured as
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