Table A1 - Control Board Connector Descriptions (Top); Table A2 - Control Board Connector Descriptions (Left Side) - Maritime Geothermal Nordic PC Series Installation And Service Manual

The tables describe the connections starting with the top of the board and working around the board counter clock-wise.

TABLE A1 - Control Board Connector Descriptions (Top)

Signal Description
HPS1 High Pressure Sensor 1
LPS1 Low Pressure Sensor 1
EEV1 Local EEV
TS1 Suction Line Temperature 1
EEV2 Remote EEV
TS2 Suction Line Temperature 2
HPS2 High Pressure Sensor 2
LPS2 Low Pressure Sensor 2
HTS Outdoor Temperature
CTS Auto Calibration
I_IN Indoor Loop IN
I_OUT Indoor Loop OUT
O_IN Outdoor Loop IN
O_OUT Outdoor Loop OUT

TABLE A2 - Control Board Connector Descriptions (Left Side)

Name Description
PWM_IN Signal for PWM IN
IN_SPARE Spare digital input
COM_IN Common for PWM IN
PWM4 PWM / 0-10VDC output
PWM3 PWM / 0-10VDC output
PWM2 PWM / 0-10VDC output
PWM1 PWM / 0-10VDC output
GND Ground
HZC Hot Zone Circulator
CZC Cold Zone Circulator
ICR Internal Circulator Relay
DO_3 Digital output
DO_2 Digital output
DO_1 Digital output
DO_0 Digital output
LC Loop common (ground)
L6 Loop6
L5 Loop5
L4 Loop4
L3 Loop3
L2 Loop2
L1 Loop1
C(SH) Soaker Hose common
SH Soaker Hose
ISSUE 03: 1-Oct-2021
Measures compressor discharge pressure.
Measures compressor suction pressure.
EEV
Mounted to suction line.
Not used.
Not used.
Not used.
Not used.
Not used.
Resistor in connector for auto-calibration reference (32°F—0°C).
Not used.
Mounted in dry well on pool water IN pipe inside unit.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Control signal for fan in optional outdoor unit.
Not used.
Not used.
Not used.
Signal for dry contact pool pump control (CP1 And CP2).
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
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