15.4 FIELD WIRING
All wires being placed into the terminal block should be horizontal for at least an inch to ensure sufficient electrical conductivity.
15.4.1 System Sensor
The temperature of the primary return can be controlled by installing a system sensor. The system sensor must be used in all
Cascade modes, and must be enabled through the DynaMax controller or through LabVision.
15.4.2 Cascade Setup
To setup a cascade system a Master boiler must be chosen, and the other boilers connected to it in this system are designated
as Slaves.
Connect the system sensor and outdoor sensor (if equipped) to the Master boiler. The Master boiler will use the water
temperature in the primary loop to control the operation of the cascade setup. The location of the system sensor should be
installed downstream of all the zones in the primary loop. The system sensor is wired into the DynaMax Terminal board as
shown in the diagram below.
If outdoor reset is desired, the outdoor sensor needs to be connected to the Outdoor Sensor location on the DynaMax Terminal
Board. When the outdoor sensor is connected to the Master boiler, the DynaMax Controller will recognize this automatically and
the Master will calculate the water temperature set point based on the Ch_Setpoint Curve. If the outdoor sensor is not
connected to the Master boiler the DynaMax Controller will maintain a fixed water temperature that is programmed into the
control.
If a Zone Thermostat is available, it needs to be connected to the Room Thermostat terminals on the DynaMax Terminal Board.
If the boiler is required to run continuously a jumper cable can be placed between the ‘5’ and ‘6‘ contacts, this will then force a
call for heat on the cascade setup.
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