Knight 100 Series Service Manual Download Page 28

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BMS Thermostat Input

When controlling the boiler through the 0 - 10V BMS input,
BACnet, or ModBus, the boiler can be enabled one of two
ways. With the

BMS Thermostat Input parameter

set to

ACTIVE, the boiler will be enabled by closing the Heat/
Loop Demand 1 input. When set to INACTIVE, the boiler
will be enabled by the voltage level on the 0 - 10V input (in
the case of 0 - 10V BMS control), or the 0 - 10V input value
received through BACnet or ModBus. The default value is
INACTIVE.

On Volts

When programmed for BMS control through the 0 -
10V BMS input or through ModBus/BACnet and the
BMS Thermostat Input is set to INACTIVE, the

On Volts

parameter determines the 0 - 10V BMS input voltage at
which the boiler is enabled. The minimum value is 0.5V and
the maximum is 10.0V. The default value is 2.0V.

Off Differential Volts

When programmed for BMS control through the 0 - 10V
BMS input or 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 - 10V BMS input voltage must be in order
to disable the boiler. 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 boiler is being controlled through BACnet or ModBus,
set

ModBus/BACnet

parameter to ACTIVE. Otherwise, set

the

ModBus/BACnet

parameter to INACTIVE. Note that

the boiler can still be monitored by ModBus or BACnet
with this parameter set to INACTIVE. The default value is
INACTIVE.

BAS T/O

This is the amount of time the unit controls will wait to
receive a communication string from the BMS controller
before reverting back to its own internal parameters. This
parameter is adjustable by the installer by accessing the

BAS

T/O

parameter

The adjustment range of this parameter is 5

seconds to 2 minutes.

The default value is 10 seconds.

Service

Rate at Minimum Volts

When programmed for BMS control through the 0 - 10V
BMS input or through ModBus/BACnet and the BMS Type
is programmed as POWER, the modulation percentage
represented by the

Volts at Minimum

parameter is set by the

Rate at Minimum Volts

parameter. The minimum value is 0%

and the maximum is the

Rate at Maximum Volts

setting. The

default value is model dependant.

Rate at Maximum Volts

When programmed for BMS control through the 0 - 10V
BMS input or through ModBus/BACnet and the BMS Type
is programmed as POWER, the modulation percentage
represented by the

Volts at Maximum

parameter is set by the

Rate at Maximum Volts

parameter. The minimum value is the

Rate at Minimum Volts

setting and the maximum is 100%. The

default value is 100%.

Set Point at Minimum Volts

When programmed for BMS control through the 0 - 10V
BMS input or through ModBus/BACnet and the BMS Type
is programmed as SETPOINT, the set point represented by
the

Volts at Minimum

parameter is set by the

Set Point at

Minimum Volts

parameter. The minimum value is 32°F (0°C)

and the maximum is the

Set Point at Maximum Volts

setting.

The default value is 70°F (21°C).

Set Point at Maximum Volts

When programmed for BMS control through the 0 - 10V
BMS input or through ModBus/BACnet and the BMS Type
is programmed as SETPOINT, the set point represented by
the

Volts at Maximum

parameter is set by the

Set Point at

Maximum Volts

parameter. The minimum value is the

Set

Point at Minimum Volts

setting and the maximum is 190°F

(88°C). The default value is 180°F (82°C).

Volts at Minimum

When programmed for BMS control through the 0 - 10V BMS
input or through ModBus/BACnet, the

Volts at Minimum