Table A4 - Control Board Connector Descriptions (Right Side) - Maritime Geothermal Nordic PC Series Installation And Service Manual

TABLE A4 - Control Board Connector Descriptions (Right Side)

Signal Description
DI_1 Digital Input1
DI_0 Digital Input0
PM2 Phase Monitor2
PM1 Phase Monitor1
Y2A* Aquastat Stage2
RA* Aquastat Power (24VAC)
Y1A* Aquastat Stage1
CA* Aquastat Power (Ground)
2 Plenum Heat Stage2
1 Plenum Heat Stage1
C Plenum Heat Common
AR Airflow Reductions
24VAC Power
ODFLO Outdoor Flow Switch
IDFLO Indoor Flow Switch
L Thermostat Lockout Indicator
E Thermostat Emergency Heat
O Thermostat Heat/Cool
W2 Thermostat Auxiliary Heat
Y2 Thermostat Stage2
Y1 Thermostat Stage1
G Thermostat Fan
R Thermostat Power (24VAC)
C Thermostat Power (Ground)
*NOTE: There is no need for an external aquastat for most systems, since the Setpoint Control Method provides built-in aquastat
functionality.
ISSUE 03: 1-Oct-2021
24vac input for detection of optional outdoor unit.
Not used.
Not used.
Not used.
Not used.
Used only for external aquastat control *.
Used only for external aquastat control *.
Used only for external aquastat control *.
Electric auxiliary heat stage 1 (turns on or off).
Electric auxiliary heat stage 2 (turns on or off).
Ground for electric auxiliary heat control.
24vac input for reduction of airflow by the AR percent factor.
24vac output for AR above.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Connect to R through dry contact to enable fan recirculation mode.
Not used.
Not used.
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