Edge [ii] Controller Operation Manual
SECTION 6
– ADVANCED SETUP
OMM-139_E
• 8/25/2020 Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST Page
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of
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Figure 6.3.4.5: Operating Controls: Reserve Unit Control Screen
2. To enable a Reserve Unit, set
Reserve Unit Control
to
Enabled
.
3. If
Reserve Unit Control
=
Enabled
, the following additional parameters are available:
•
Reserve Relay Unit Addr
: The address of the Edge unit that the reserve boiler is
connected to via its reserve unit relay. (Range: 0 to 16 or max address in the plant)
•
Enable System Threshold
: The plant fire rate that activates (closes) the Reserve
Unit to fire. (Range: 20% to 100%)
•
Disable System Threshold
: The plant fire rate that deactivates (opens) Reserve
Unit; should be at least 20% below
Enable System Threshold
.
(Range: 20% to 90%)
NOTE:
In the event of a power outage, the BST Manager will not be able to tell the Reserve Unit to
turn on. In the case where the Reserve Unit is also acting as a backup unit, a separate,
normally open relay should be installed so that when a generator is operating the Reserve Unit
will be active as well.
Setpoint Range
The
Setpoint Range
screen includes all Setpoint Limiting and Setpoint Setback parameters for
all units in the cascade.
NOTES
:
•
This screen is available only after BST Cascade functionality has been enabled (
Unit
Mode
=
BST Client
or
BST Manager
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.
•
Some of the parameters below also appear in
, which is
available only to standalone units. This section is available when that section is
unavailable (see previous bullet).