IMC Eagle 2 DTC for PV Direct

The advanced electronic control for today’s sophisticated solar hot water systems.

This Differential Temperature Control is designed to provide maximum operating and flexibility to effectively manage today’s innovative solar energy systems. The Eagle D2 is capable of handling most differential temperature control functions for operation of domestic water heating and sophisticated space heating and cooling. It is especially well suited for Antifreeze, Drainback and Recirculating type solar heating systems.

Note: 0 V minimum to 22 VDC maximum - Warranty is VOID if voltage exceeds 22 VDC

BENEFITS

• PV POWERED from 0 VDC to 22 VDC with SMART power management at very low PV power levels. A "must" for soft pump starts and smooth controller operation.
• Microprocessor accuracy and dependability with ambient operation from -10 to 120° F.
• Large easy-to-read 40 character (20x2) backlit LCD display showing every parameter measured and controlled by the microprocessor.
• PC DATA PORT with built-in transmitter allows optional adapter and up to 500 ft. cable to interface with computers for ease in startup and remote diagnostics. Or, for adding an optional large 80 character (4x20) backlit LCD display. Remote-mount up to 150 ft. distances with a CAT-5 cable.
• Long-term diagnostics and data logging is possible using communications software that is included in Windows OS.
• Fault LED indicators for quick servicing and diagnostics
• Features for fast installation and wiring
• Electrostatic discharge protected
• One HP or 20 AMP high reliability relay
• Polyester coated 16 gage rugged steel enclosure with 1/2” conduit holes for permanent wiring
• Two industrial 400°F (204°C) rated 10K thermistors with +/- 1°F accuracy are included.
• Two auxiliary thermistor inputs for optional sensors that can be located up to 1000’ away.
• Selectable overrides for low temperature shut down or freeze protection modes for safe operation.

TEMPERATURE DIFFERENCE CONTROL
When the temperature difference between the sensor on the solar collector and the sensor in the storage tank exceeds the dialed temperature difference setting (ON DIF), the pump relay will actuate after a 30 second delay. The blue LED indicator will also turn ON. When the temperature difference decreases and falls below 4 F (2.2 C), the pump relay and the blue LED indicator will turn off without delay.

HIGH LIMIT CONTROL- When the temperature in the storage tank exceeds the HI-LIMIT dialed setting, the PUMP relay will be turned OFF without delay regardless of the status of the temperature difference that exists between the storage tank and the solar collector. The blue LED indicator will also turn OFF. When the storage tank temperature falls 4 degrees below the setting in the HI-LIMT, the controller will then resume normal operation. The pump relay will always have a 30 second delay before switching ON and the blue LED will always show its STATUS condition.

LOW TEMPERATURE SHUT DOWN
This feature is available to prevent the system from operating at low outdoor temperatures. If this feature is enabled normal operation will stop when the collector temperature falls below 50 degrees F. The pump relay will then be turned off. Normal control operation will not resume until the collector temperature returns to 70 degrees or above. To enable this feature, a jumper must be placed onto the jumper pins marked "LO" on the circuit board. Only ONE of these two override features can be enabled.

FREEZE PROTECTION OVERRIDE
This feature is available to prevent a non-drain back "water only" system from freezing when the outdoor temperature drops too low. If this feature is enabled normal operation will stop when the collector temperature falls below 37 F. The pump relay will then be turned ON until the collector temperature reaches 52 F. Normal control operation will resume above this temperature. To enable this feature, a jumper must be placed onto the jumper pins marked “FZ’ on the circuit board. Only ONE of these two override features can be enabled.

STATUS INDICATION LEDS
There are four status indication LEDS. The GREEN LED indicates that the microprocessor is powered and the solar controller is running. The BLUE LED indicates pump operation. When ON, the pump is operating and solar energy is being stored in the storage tank. The AMBER LED indicates if the UPPER LIMIT temperature in the storage has been exceeded. The RED LED indicates when there is a fault condition. The conditions that can cause the fault LED to turn ON are as follows: OPEN or SHORTED or OUT of RANGE temperature sensors, pump relay switch not set to “AUT” (automatic) position and internal component malfunctions. The RED LED will always be flashing when the FAULT indication is ON.

SENSORS
Industrial 400°F (204°C) rated 10K IMC thermistors have +/- 1°F accuracy. When installed, they will not exceed ONE degree of additional error for cable distances up to 1000 feet of 18ga., 700 feet of 20ga. or 500 feet of 22ga.

SENSOR SCREW TERMINALS
There are 9 screws on a GREEN block located at the top edge of the board. These terminals accept solid or stranded wire from 18ga. to 22ga. They are NEC class 2 circuit connections.

POWER AND RELAY TERMINALS
This model operates from 4.75 Vdc to 22 Vdc@ 250 milliwatts Operation below 4.75 Vdc is prevented by the smart power manager including initial pump start ups untill there is sufficient PV power for proper pump operation. Operation above 22 Vdc could damage the controller and will void the Warranty. The solid state relay is rated for 5 amps continuous load and has only normally open contacts. Its low side contacts are internally grounded. The pump is connected between the PV plus and the open relay terminal.

See more technical information and installation instructions about this differential temperature control in the Product Documentation section above!