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SECTION 6 STANDALONE MODES OF OPERATION
Unit Application = SH
4. Set the following parameters to define the total outside air temperature span which will be used for
Setpoint control.
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OAR Min Outside Temp: The minimum outside temperature the system can read; it is tied to
the OAR Max Setpoint. For example, if OAR Min Outside Temp is -5°F and OAR Max Setpoint is
180°F, when the outside temperature is -5°F or below, the system will supply 180°F.
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OAR Max Outside Temp: Outdoor Air Reset Maximum Outside Temperature that the system
will operate to. For example: if set to 60°F, the boiler will operate between 60°F outside
temperature and OAR Min Outside Temp setting.
5. Set the following parameters to define the Setpoint curve, which will be used to yield a desired
setpoint for a given outside temperature:
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OAR Max Setpoint: The maximum allowable setpoint (range = Min Setpoint up to 190°F).
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OAR Min Setpoint: The minimum allowable setpoint (range = 140°F up to the Max Setpoint).
Set the Warm Weather Shutdown parameter to the threshold outside temperature above which the
unit shuts down. For example, if set to 65°F, when the outside temperature goes above 65°F, the unit
goes into standby. The unit will then restart when below 60°F.
6.2 Constant Setpoint Mode
The Constant Setpoint mode (the default) is used when a fixed header temperature is desired. Common
uses of this mode of operation include water source heat pump loops, and indirect heat exchangers for
potable hot water systems or processes.
No external sensors are required to operate in this mode. While it is necessary to set the desired
setpoint temperature, it is not necessary to change any other temperature-related functions. The unit is
factory preset with settings that work well in most applications. Prior to changing any temperature-
related parameters, other than the setpoint, it is suggested that an AERCO representative be contacted.
The setpoint temperature of the unit is adjustable from 140°F to 190°F.
To set the unit to Constant Setpoint mode:
Main Menu → Advanced Setup → Unit →Application
1.
Go to:
2. Press SH Operating Mode and choose Constant Setpt.
3. Press SH Setpoint and choose the desired setpoint.
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Figure 6-1: Application Configuration Screen
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Unit Application = Outdoor Reset
Configuration.
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