Boiler Management System (Bms) Connection - Primera 400B Installation & Maintenance Manual

BOILER MANAGEMENT SYSTEM (BMS) CONNECTION

Connections for BMS control are made to the terminal strip located on rear of PRIMERA control box.
The terminal strip is accessed by removing the PRIMERA top pan.
Refer to above picture for all applications
If BMS is to provide remote on/off control only:
1. Remove the jumper connecting terminals R1 and R2
2. Connect the BMS output leads for the enable/disable function to terminals R1 and R2
3. Leave all other wires in their initial positions
If BMS provides STAGE-FIRING control: (Models 400B)
1. Remove the jumper connecting terminals R1 and R2
2. Connect the BMS first stage leads to terminals R1 and R2 (no polarity)
3. Connect the BMS second stage leads to terminals T1 and T2 (no polarity)
4. On the TempTrac Control, move parameter St1 up to its maximum setting of 180°F. This setting
effectively takes the TempTrac out of the way and allows complete control by the BMS system
5. Leave all other wires in their initial positions
NOTE: BMS must call for both first and second stage operation before firing cycle will be initiated. Afterward,
BMS can cycle between low and high fire.
If BMS provides MODULATION control through a 4 to 20 milliamp or 0 to 10 volt signal:
1. Remove the jumper connecting terminals R1 and R2
2. Connect the BMS output leads for the enable/disable function to terminals R1 and R2 (no polarity)
3. Remove blue wire from terminal T1 and cap the end with a wire nut. Secure the loose wire
4. Connect the BMS variable signal output leads to terminals T1 and T2 (T1 is positive, T2 is negative)
5. On the TempTrac Control, move parameter St1 up to its maximum setting of 180°F. This setting
effectively takes the TempTrac out of the way and allows complete control by the BMS system
6. If the BMS supplies a 0 to 10 volt signal, the resistor connecting terminals 1 and 3. For milliamp signal,
resistor must remain in place
7. Leave all other wires in their initial positions
In all cases, the BMS must sense temperature on the building's hydronic distribution loop upstream of the
PRIMERA boilers. No attempt should be made to control the PRIMERA boilers by sensing temperature
downstream of the boilers.
18 34-50 04/02/2010