Operation:

This panel is designed to separate the secondary system fluid from the primary system fluid by utilizing a plate heat exchanger. It is recommended for applications that use an open loop system as the heat source or in applications where a water/glycol mixture is used in the secondary heating loop. The secondary system is filled during installation and operates as a closed loop circuit. The panel includes an expansion tank and relief valve for the secondary side of the system. There is no supply water temperature control provided.
The panel is operated as a single zone system by using a thermostat to activate the primary circulator. The secondary circulator operates continuously providing even heat distribution during the heat up and cool down cycles. The balancing valves on the supply manifold with the flow indicators on the return manifold allow the user to adjust and visually monitor the flow rates of each loop. Valves on the supply and return manifolds also allow each loop to be isolated when necessary.

The operation is controlled by closure of an external dry contact. An example of devices that can provide this are: two and three wire room thermostats, programmable thermostats, set point controls, indoor/outdoor reset controls, integrated building controls, etc. A control module contains a 24V transformer, a circulator relay, a dry contact enable, and an adjustable high limit which prevents the supply fluid from exceeding the desired temperature.

The panel can also be operated as a multiple zone system. The valves located on the return manifold can be fitted with optional electrical valve actuators to control the floor loops in the system. In this application, every actuator is connected to a thermostat located in the area served by the loop. When the thermostat calls for heat, the actuator opens the loop allowing flow. When all loops are satisfied, the primary and secondary circulators are shut down.

The control panel includes:

• Supply manifold with shut off valves
• Return manifold with shut off valves and provision for valve actuators
• Flow rate indicators on return
• Control module
• Primary circulator (stainless steel)
• Secondary circulator
• Plate heat exchanger
• Pressure and temperature gauges
• Fill/drain valves
• Isolating valves
• Automatic air vent
• Manual air vent for primary loop
• Pressure relief valve for secondary loop
• Steel cabinet