Lochinvar Shield SWR125 Installation & Service Manual page 62

Installation & Service Manual
10
Operating information
Set Point at Maximum Volts
When programmed for BMS control through ModBus/
BACnet and the BMS type is programmed as SETPOINT, the
setpoint represented by the Volts at Maximum parameter
is set by the Setpoint at Maximum Volts parameter. The
minimum value is the Setpoint at Minimum Volts setting
and the maximum is 180°F (88°C). The default value is
180°F (82°C).
Volts at Minimum
When programmed for BMS control through ModBus/
BACnet, the Volts at Minimum parameter should be set
to the minimum voltage signal sent to the water heater
control. The range of this parameter is 0.0V to the Volts at
Maximum value. The default setting is 2.0V.
Volts at Maximum
When programmed for BMS control through ModBus/
BACnet, the Volts at Maximum parameter should be set
to the maximum voltage signal sent to the water heater
control. The range of this parameter is the Volts at
Minimum value to 10.0V. The default value is 10.0V.
Off Differential Volts
When programmed for BMS control through ModBus/
BACnet and the BMS Thermostat Input is set to INACTIVE,
the Off Differential Volts parameter determines how far
below the On Volts setting the 0 - 10 VDC BMS input
voltage must be in order to disable the water heater. The
minimum value is 0.2V and the maximum is the On Volts
setting. The default value is 1.0V.
ModBus/BACnet
When BMS is set to ACTIVE (see BMS Active / Inactive)
and the water heater is being controlled through
BACnet or ModBus, set ModBus/BACnet parameter to
ACTIVE. Otherwise, set the ModBus/BACnet parameter
to INACTIVE. Note that the water heater can still be
monitored by ModBus or BACnet with this parameter set
to INACTIVE. The default value is INACTIVE.
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