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107750-01 - 9/17
Factory
Setting
Range /
Choices
Parameter and Description
Local
Local,
4-20mA
Central Heat Modulation Source
This parameter enables the 4-20mA input to control firing rate and the thermostat input to control
boiler on/off demand directly without using the internal setpoint. The 4-20mA selection is used to
enable a remote multiple boiler controller:
Local: 4-20mA Input on Control Terminals J8-6 and J10-8 is ignored.
4-20mA 4-20mA Input on Control Terminals J8-6 and J10-8 is used to control firing Rate %
directly.
Modbus Modbus input used to control firing Rate % directly.
Local
Local,
4-20mA
Central Heat Setpoint Source
Sets the remote (Energy Management System) control mode as follows:
Local: Local setpoint and modulation rate is used. 4-20mA input on Control Terminals J8-6 and
J10-8 is ignored.
4-20mA 4-20mA Input on Control Terminals J8-6 and J10-8 is used as the temperature setpoint.
The following two parameters may be used to adjust the signal range.
Modbus Modbus is used as the temperature setpoint.
130°F
(54.4°C)
80°F (26.7°C) -
Central Heat
Setpoint
Central Heat 4-20mAdc Setup, 4 mA Water Temperature*
Sets the Central Heat Temperature Setpoint corresponding to 4mA for signal input on Control
Terminals J8-6 and J10-8. Current below 4mA is considered invalid, (failed or incorrect wired input).
180°F
(82.2°C)
80°F (26.7°C) -
Central Heat
Setpoint
Central Heat 4-20mAdc Setup, 20 mA Water Temperature*
Sets the Central Heat Temperature Setpoint corresponding to 20mA for signal input on Control
Terminals J8-6 and J10-8. Current above 20mA is considered invalid, (failed or incorrect wired input).
Local
Local,
Modbus
Central Heat Demand Source
This parameter enables a Modbus input to be take the place of the Heating Thermostat Input:
Local
Local Heating Thermostat input is used for Central Heat demand.
Modbus Modbus input is used for Central Heat demand.
* Only visible when Central Heat Setpoint Source is set to 4-20mA.
“Press”
button to access the following parameters:
XII. Operation
F. Changing Adjustable Parameters (continued)
Summary of Contents for ASPEN ASPN-320
Page 88: ...88 107750 01 9 17 Figure 10 4 Proper Installation of Header Sensor X Wiring continued ...
Page 89: ...89 107750 01 9 17 Figure 10 5 Internal Wiring Ladder Diagram X Wiring continued ...
Page 90: ...90 107750 01 9 17 X Wiring continued CONDENSATE FLOAT SWITCH ...
Page 91: ...91 107750 01 9 17 X Wiring continued Figure 10 6 Internal Wiring Connections Diagram ...
Page 100: ...100 107750 01 9 17 Operating Instructions XI Start Up and Checkout continued ...
Page 145: ...145 107750 01 9 17 XV Service Parts continued ...
Page 147: ...147 107750 01 9 17 XV Service Parts continued All Models ...
Page 149: ...149 107750 01 9 17 XV Service Parts continued All Models ...
Page 151: ...151 107750 01 9 17 XV Service Parts continued All models ...
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