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A – Alarm
C – 24 VAC common
DH – Dehumidification
G – Low speed fan
G2 – High speed fan
RC, RH – 24 VAC hot
SC, S1 – Remote sensor or outdoor sensor
DH
DH
I/O Exp
TB1-1
6
Terminal Designator Descriptions
G
W3 W2 W1 Y3
G
W3 W2 W1 Y3
Microtech III unit controller TB2
W1 – 1st stage heat
W2 – 2nd stage heat
W3 – 3rd stage heat
Y1 – 1st stage cool
Y2 – 2nd stage cool
Y3 – 3rd stage cool
Thermostat
Y2
Y1
C
Y2
Y1
C
Note 1: Not all terminals are used
in every model.
Note 2: A connection to 24VAC
common (C) is required.
RC RH
A
SC
RC RH
A
SC
Remote
Sensor
S1
S1
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