NTI TFTN - Page 87

TFTN 085-199 Installation and Operation Manual
87
Table 16-10 Pump Control Settings (…Continued)
Setting
Parameter
Range/Description
Factory Setting
Auxiliary
Pump 1
Selection
24.7.0
Sets the functionality of output AUX1 PUMP.
System Pump – powers during CH demands. Will also power during
Downstream IWH demands if System Pump Activation Logic, in the
Advanced Settings screen of the DHW Setup menu, is set as Always
Active.
DHW Recirc – powers during DHW Recirc demands; see setting
Auxiliary Sensor 2 in the Sensor Configuration menu for setup of a
DHW Recirc sensor.
Buffer Tank – powers during Buffer Tank demands; see settings
Auxiliary Sensor 1 and Auxiliary Sensor 2 in the Sensor Configuration
menu for setup of a Buffer Tank sensor.
None
Boiler Pump
Speed Control
Signal
24.3.4
Sets the type of signal that the boiler will output to drive the speed of
a variable speed boiler pump to achieve a delta-T equal to the Delta-T
Target - Pump Speed Control setting.
0-10V – connect to VAR. PUMP terminals "+" and "return" (in arrow).
PWM – connect to VAR. PUMP terminals "-", "return" and "out" (out
arrow).
PWM
Delta-T Target
– Pump Speed
Control
24.3.5
Sets the delta-T target for the boiler when using Boiler Pump Speed
Control Signal to control the speed of a variable speed boiler pump.
(Range = 5-45°F)
25°F
Maximum
Pump Speed
24.3.0
Sets the maximum control signal to the boiler pump when using Boiler
Pump Speed Control Signal to control the speed of a variable speed
boiler pump. (Range = MinimumPumpSpeed-100%)
100%
Minimum
Pump Speed
24.3.1
Sets the minimum control signal to the boiler pump when using Boiler
Pump Speed Control Signal to control the speed of a variable speed
boiler pump. (Range = 20-MaximumPumpSpeed)
50%
Auxiliary
Pump 2
Selection
24.7.1
Sets the functionality of output AUX2 PUMP.
System Pump – powers during CH demands. Will also power during
Downstream IWH demands if System Pump Activation Logic, in the
Advanced Settings screen of the DHW Setup menu, is set as Always
Active.
DHW Recirc – powers during DHW Recirc demands; see setting
Auxiliary Sensor 2 in the Sensor Configuration menu for setup of a
DHW Recirc sensor.
Buffer Tank – powers during Buffer Tank demands; see settings
Auxiliary Sensor 1 and Auxiliary Sensor 2 in the Sensor Configuration
menu for setup of a Buffer Tank sensor.
System Pump
16.3.2.5 BMS Control
Access the BMS Control screen to configure the boiler to accept a 0-10V signal to control the burner firing rate or
temperature setting from an external device.
Note: BMS Control is only applicable for CH demands – not DHW demands. For cascade systems, the external 0-10V is
applied to the Manager boiler for control of the complete cascade for CH demands.