8
Table 3 — Discrete or Digital Inputs
INPUT
PIN
CONNECTION
POINT
TERMINAL
CONNECTION
POINT
COMMENT
Compressor
Current Sensor A1
J9 — 10,11,12 (MBB) —
Part No. = HK50AA035
Compressor
Current Sensor B1
J9 — 7,8,9 (MBB) —
Compressor
Current Sensor C1
J9 — 4,5,6 (MBB) —
Filter Status
J9 — 2,3 (MBB) TB3 — 14,16 Part No. = HK06WC029
Fan Status
J8 — 15,16 (MBB) TB3 — 11,12 Part No. = HK06WC028
Y1
J7 — 10 (MBB) TB4 — 2 Thermostat Y1 (1
st
Stage Cooling)
Y2
J7 — 8 (MBB) TB4 — 3 Thermostat Y2 (2
nd
Stage Cooling)
W1
J7 — 6 (MBB) TB4 — 4 Thermostat W1 (1
st
Stage Heating)
W2
J7 — 4 (MBB) TB4 — 5 Thermostat W2 (2
nd
Stage Heating)
G
J7 — 2 (MBB) TB4 — 6 Thermostat G (Fan)
Fan Feedback
J7 — 4 (MBB) —
Senses when the indoor fan contactor coil is
being energized
Shutdown
J6 — 5, 6 (MBB) TB3 — 5,6 Request Unit Shutdown via smoke detector, etc.
Enthalpy
J5 — 4 (ECB) TB5 — 1,4 Part No. = HH57AC077
Fig. 6 — Economizer Control Board
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