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Components
7.0 COMPONENTS & CONTROLS
7.5 EcoNet
™
Variable Speed Outdoor Control (VSODC)
7.5.1 Board Features and
Connections
(-)P20 heat pumps are equipped with a Variable
Speed Outdoor Control (VSODC) that interfaces
with the inverter, EcoNet
TM
Control Center, and
EcoNet
TM
enabled air-handler or gas furnace using
the EcoNet
TM
serial communication protocol. The
VSODC provides a low voltage terminal block
for control wiring and connections for various
sensors, controls, outdoor fan motor and inverter.
It also has a dual 7-segment LED for displaying
status and fault codes. Buttons are provided
for navigating the control menu and to initiate
and terminate various test modes. A plug-in
memory card provides model specific information
(model data) necessary for proper unit operation
and parameters for the correct indoor air-flow.
Dip switches are provided to allow adjustment
of the defrost termination temperature, outdoor
superheat setting, and number of EXV steps.
Colored LED’s are provided to indicate if the EXV
is in the process of opening or closing.
The following is a list of features on the VSODC
and location of each.
1. Thermostat Terminals
2. Communication wire terminals
3. Modbus unitary inverter communication
connection
4. Outdoor PSC Fan relay connections
5. Outdoor ambient thermistor connection
6. Coil sensor (EVAPIN) and suction thermistor
(OST) connections
7. Liquid line thermistor (OLT) connection
8. Outdoor ECM fan PWM output connection
9. Suction pressure transducer (SPT) connection
10. Liquid pressure transducer (LPT) connection
11. Electronic expansion valve connection
12. Reversing Valve Connections
13. 3 Amp fuse
14. Test and SW2 Button
15. Communications LEDs (ET – EcoNet™
communication is transmitting; RT –
EcoNet™communication is receiving)
16. Memory card connection
17. Dual seven segment LED – Displays status,
diagnostic codes, fault recall, compressor
speed, superheat, and defrost menus
18. Dip Switches – Defrost Termination
Temperature (DF1, DF2)
19. Dip Switches – EXV SH Offset (SH1, SH2)
20. EXV Operational Lights (Green – EXV is
opening; Amber - EXV is closing)
CAUTION: UNIT MAY START
SUDDENLY AND WITHOUT WARNING.
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