Edge [ii] Controller Operation Manual
SECTION 6
– ADVANCED SETUP
OMM-139_E
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2. The following parameters are available:
•
On Delay
: Minimum length of time a unit must stay off after shutting down or going
into standby. (Range: 30 to 300 sec.)
•
Slow Shutdown
: Enable/Disable the Slow Shutdown feature. Once enabled on a
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
during delay shutdown. (Range: 0°F to 25°F)
•
Demand Offset
: Offset temperature from setpoint before a unit may come online.
(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
). If the unit is configured as
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.
1. Go to:
Main Menu
→
Advanced Setup
→
BST Cascade
→
Operating Controls
→
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):