Watts AERCO Edge [ii] Operation Manual page 131

Edge [ii] Controller Operation Manual
SECTION 6 – ADVANCED SETUP
Manager or BST Client in
appear only when the unit is configured as a BST Manager:
BST Max Boilers: The maximum number of boilers that will fire. For example: if
•
there are 5 boilers, but this setting is set to 3, the plant will not fire more than 3 boilers.
(Range: 1 to 16)
SH Valve Close Delay: The time an open Isolation Valve will remain open once a
•
boiler has been cycled off. When an ignited boiler is cycled off, its Isolation Valve will
remain open for the specified time to dissipate residual heat. (Range: 0 to 15)
3. The remaining parameters are available on both BST Manager and BST Client units. They
are available depending on the Application chosen in
Configuration, as shown in the table below:
TABLE 6.12: Sequencing Control Parameters
Available Parameters
Low Flow Mode
Low Flow Threshold
SH Next On Valve Pos
SH Next Off Valve Pos
SH BST Fire Rate Up
SH High-Fire Fire Rate
SH Low-Fire Fire Rate
DHW High-Fire Fire Rate
High Fire Threshold Timer
DWH Pump Off Time
DHW BST Fire Rate Up
Low Flow Mode: Choose Off, On - Outlet Temp or On - Avg Temp. If either "On"
•
option is chosen, BST monitors the multi-boiler system to detect if a "low-flow"
condition exists. If it does exists, BST slowly shuts down one boiler at a time in an
attempt to raise the Fire Rate of the remaining boilers. If the low-flow condition
persists, and only a single boiler remains ignited, BST will use the "Outlet Temperature
Sensor" of the remaining ignited boiler to control the temperature. The Outlet
Temperature Sensor is mounted in the individual boiler and drastically increases the
response time to precisely control temperature.
Low Flow Threshold: For low flow applications, this parameter allows the boiler to
•
operate without excessive cycling. This parameter specifies the valve position below
which the boiler plant will enter this mode (Range: 10% to 35%, default = 25%).
SH Next On Valve Pos: Determines the valve position that triggers the next SH
•
(Space Heating) unit to come on line. (Range: 16% to 100%)
SH Next Off Valve Pos: Determines the valve position that triggers the next SH
•
(Space Heating) unit to come off line. (Range: 16% to 100%)
•
OMM-139_E 8/25/2020
Section 6.3.1: Cascade
Current BST Application
SH+DH
SH DHW Other
W-2-Vlv
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓
✓
✓ ✓ ✓
✓
Technical Support • (800) 526-0288 • Mon-Fri, 8 am - 5 pm EST
Configuration. The following parameters
Section 6.3.3: BST Application
SH+DH
SH+DH
W-Stpt
W-1-Vlv
Prty
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
✓ ✓ ✓
Other+SH- Other+DHW
Stpt Prty -Stpt Prty
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓ ✓
✓
✓
✓ ✓
✓
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