Boiler Control Instruction & Operation Manual, Rev 1
Page
31
of 64
Setup & Tuning
Parameter Adjustment
From the CONFIGURE menu select the following buttons to view and adjust parameters.
Press SYSTEM IDENTIFICATION & ACCESS to adjust the following parameters.
Factory
Setting
Range /
Choices
Parameter and Description
76
9 Character
Maximum
Installer Password
Allows for custom password to be set. Must be 9 characters or less. Only allows
adjustment of supervisor password (supervisor default: 76). Cannot change Factory
password.
•
Must enter current installer password.
•
Must enter new password and press enter.
•
Must re-enter new password and press enter.
NOTE
:
Can be reset to supervisor default 76 if accessed with the Factory level password (86).
None
1 to 8
MB2 Modbus Address
Each boiler must be given a unique address. When
“Normal” slave selection order is
used, the
boiler address is used by the Sequence Master as the boiler start order.
Press CENTRAL HEAT CONFIGURATION to adjust the following parameters
.
Factory
Setting
Range /
Choices
Parameter and Description
180
50 to 190 (ºF)
Central Heat Setpoint
Target temperature for the central heat priority. Value also used by the outdoor air reset
function.
170 (ºF)
50 to 190 (ºF)
Central Heat Time of Day (TOD) Setback Setpoint
The TOD setpoint is used when a time of day timer relay is wired to the Time Of Day
Controller Input. When setback i
s “on” the time of day setback setpoint shifts the reset
curve to save energy while building is in a reduced room temperature mode. The reset curve
is shifted by the difference between the High Boiler Water Temperature and the TOD
Setback Setpoint. Any time of day timer may be used to provide the input to the control
TOD input. When connected, it allows boiler water setback cost savings.
10 (ºF)
3 to 29 (ºF)
Central Heat Off Hysteresis
The boiler stops when the water temperature rises
‘Difference Above’ degrees above the
setpoint.
5 (ºF)
3 to 29 (ºF)
Central Heat On Hysteresis
The boiler starts when the water temperature drops
‘Difference Below’ degrees below the
setpoint.
Local
Local,
4-20mA,
Modbus
Central Heat Setpoint Source
The setpoint may be based on local (customer entered value or outdoor reset) or remote
(4-20mA or Modbus) signals. Setpoint Source has the following selections:
Local
User entered CH Setpoint or Reset Curve provides the setpoint.
4-20mA
Input wired to J8 terminals 6 and 7 is used as setpoint.
Modbus
Modbus signal is used as setpoint.
STAT
terminal
STAT terminal,
Modbus
CH Demand Switch
The Central Heat demand (Central Heat Enable/Disable) can be directly wired to the Control
or provide by the Modbus interface.
STAT terminal Central Heat demand is present when a contact closure is received
between J8 terminals 1 and 3.
Modbus STAT Modbus signal provides demand.
