Controls
www.DaikinApplied.com 38 Vertical Stack WSHP • IM 986-11
Table 12: MicroTech III unit controller terminals &
descriptions
H1 – 1 24
24 VAC Power Input
H1 – 2 C 24 VAC common
H2 – 1 SL1 Fan Main Required Output – Switched L1
H2 – 2 Blank Terminal
H2 – 3 N Fan Main Required Output – Neutral
H3 – 1 HP1-1 Comp High Pressure Switch (HP1) Input Terminal 1
H3 – 2 HP1-2 Comp High Pressure Switch (HP1) Input Terminal 2
H4 – 1 1 Discharge Air Temp Sensor – Common
H4 – 2 Discharge Air Temp Sensor – Signal
H4 – 3 Leaving Water Temp Sensor – Common
H4 – 4 Leaving Water Temp Sensor – Signal
H5 – 1 1
Connections to I/O Expansion Board
H5 – 2
H5 – 3
H5 – 4
H5 – 5
H5 – 6
H5 – 7
H5 – 8
H5 – 9
H5 – 10
H5 – 11
H5 – 12
H6 – 1 1 Condensate Overow Signal Input
H6 – 2 Compressor Suction Temp Sensor (LT1) – Common
H6 – 3 Compressor Suction Temp Sensor (LT1) – Signal
H6 – 4 Compressor Low Pressure Switch (LP1) – Source Voltage
H6 – 5 Compressor Low Pressure Switch (LP1) – Signal
H6 – 6 Reversing Valve – Common
H6 – 7 Reversing Valve – Output
H7 – 1 1 No Connection
H7 – 2 No Connection
H7 – 3 Red LED Output
H7 – 4 Green LED Output
H7 – 5 Yellow LED Output
H7 – 6 Red-Green-Yellow LED Common
H8 – 1 1 Isolation Valve/Pump Request Relay N/O
H8 – 2
Isolation Valve/Pump Request Relay N/C
H8 – 3 24 VAC Common
H9 – 1 1 Room Temp Sensor & Tenant Override – Signal
H9 – 2 Room Temp Sensor & Tenant Override – Common
TB1 – 1 1 Room Sensor – Status LED Output
TB1 – 2 2 Room Sensor – Fan Mode & Unit Mode Switches
TB1 – 3 3
Room Sensor – Setpoint Adjust Potentiometer
TB1 – 4 4 Room Sensor – Room Temp Sensor & Tenant Override
TB1 – 5 5 Room Sensor – DC Signal Common
TB2 – 1 R 24 VAC
TB2 – 2 A Thermostat – Alarm Output
TB2 – 3 W2 Thermostat – Heat Stage #2 (W2) Input
TB2 – 4 W1 Thermostat – Heat Stage #1 (W1) Input
TB2 – 5 Y2 Thermostat – Cool Stage #2 (Y2) Input
TB2 – 6 Y1 Thermostat – Cool Stage #1 (Y1) Input
TB2 – 7 G Thermostat – Fan Input
TB2 – 8 O Thermostat – Heat Stage #3 (W3) Input
TB2 – 9 C 24 VAC Common
TB3 – 1 E Emergency Shutdown Input
TB3 – 2 U Unoccupied Input
L1 – 1 L1 - 1 Line Voltage Terminal 1
L1 – 2 L1 - 2 Line Voltage Terminal 2
L1 – 3 L1 - 3 Line Voltage Terminal 3
N1 N1 Neutral Terminal 1
N2 N2 Neutral Terminal 2
N3 N3
Neutral Terminal 3
Table 13: I/O expansion module connectors/terminals
H1 – 1 1
Connections to Main Board
H1 – 2
H1 – 3
H1 – 4
H1 – 5
H1 – 6
H1 – 7
H1 – 8
H1 – 9
H1 – 10
H1 – 11
H1 – 12
H2 – 1 1 Auxiliary Heat Stage #2 Output – N/O
H2 – 2 No Connection
H2 – 3 24 VAC Common
H3 – 1 1 Ext. 24 VAC In
H3 – 2 Ext. 24 VAC Common In
H3 – 3 HGR / Waterside Economizer Output – N/O
H3 – 4 Ext. 24 VAC Common
H3 – 5 EC Fan Motor Variable Speed Signal Output
H3 – 6 EC Fan Motor Variable Speed Signal – Common
H4 – 1 1 Entering Water Temp Sensor – Signal
H4 – 2 Entering Water Temp Sensor – Common
H5 – 1 1 No Connection
H5 – 2 No Connection
H5 – 3 Red LED Output
H5 – 4 Green LED Output
H5 – 5 Yellow LED Output
H5 – 6 Red-Green-Yellow LED Common
H6 – 1 HP2-1 Comp High Capacity High Press Sw (HP2) Input Terminal 1
H6 – 2 HP2-2 Comp High Capacity High Press Sw (HP2) Input Terminal 2
H7 – 1 Fan Speed Table Row Select – Signal
H7 – 2 Fan Speed Table Row Select – Common
H7 – 3 Thermostat – Heat Stage #4 (W4) Input – Signal
H7 – 4 Auxiliary 24 VAC Out
H8 – 1 1 Compressor – High Capacity Output – N/O
H8 – 2 24 VAC Common
H8 – 3 No Connection
H8 – 4 Auxiliary Heat Stage #1 / Hydronic Heat Output N/O (24 VAC)
H8 – 5 24 VAC Common
TB1 – 1 1 Humidistat Signal Input
TB1 – 2 2
Thermostat - Heat Stage #4 (W4) Input – Signal
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