OM 931-6 • MicroTech III Unit Controller for WSHP
2
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Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
MicroTech III Unit Controller . . . . . . . . . . . . . . . . . . . . 4
Control Boards Terminals and Connectors
Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4
MicroTech III Unit Controller Connections. . . . . . . . . .
5
Replacing A MicroTech III Circuit Board: . . . . . . . . . . 6
Initial Power-Up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Pre start check list: . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
General Use and Information . . . . . . . . . . . . . . . . . . . 7
Occupied Operation . . . . . . . . . . . . . . . . . . . . . . . . . .
7
Thermostat Inputs (G, Y1, Y2, W1 and W2) . . . . . . . .
7
Control Inputs (HP, LP, SLTS, COF, U, E, O) . . . . . . .
7
Control Outputs {A and IV/PR (H8)} . . . . . . . . . . . . . . 8
Fan Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Unoccupied Operation – Stand Alone Thermostat
Control. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
9
Thermostat Inputs (G, Y1, Y2, W1, and W2). . . . . . . .
9
Additional Operating Modes . . . . . . . . . . . . . . . . . . . .
9
Remote Shutdown Mode. . . . . . . . . . . . . . . . . . . . . . .
9
High / Low Pressure Faults (HP/LP) . . . . . . . . . . . . .
10
Condensate Overflow . . . . . . . . . . . . . . . . . . . . . . . .
11
Fan Operation during most Modes, Faults and
Shutdowns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Troubleshooting the MicroTech III Unit Controller . . .
13
Troubleshooting the Water Source Heat Pump Unit
14
Microtech
®
III Unit Controller Interface to External
Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Appendix A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Operation and Maintenance of I/O
Expansion Module. . . . . . . . . . . . . . . . . . . . . . . . . . .
15
Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Initial Power up . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
16
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Electric Heat Controls . . . . . . . . . . . . . . . . . . . . . . . . 17
Multiple Speed Fan Control. . . . . . . . . . . . . . . . . . . .
17
Circuit Two, Additional Operating Modes . . . . . . . . .
17
Second Circuit Faults . . . . . . . . . . . . . . . . . . . . . . . . 18
Appendix B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
MicroTech III Unit Controller with
L
on
W
orks
®
Communication Module . . . . . . . . . . . . . . . . . . . . . .
19
MicroTech III Controller with BACnet
®
Communication
Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Appendix C – Typical Wiring Diagrams . . . . . . . . . . 21
MicroTech III Unit Controller (Standalone) –
208/230/460/575/60Hz/3-Phase . . . . . . . . . . . . . . . . 21
MicroTech III Unit Controller with Optional ECM
Motor, Desuperheater and I/O Expansion Module –
208/230/265/277/60 Hz/1-Phase . . . . . . . . . . . . . . . 22
MicroTech III Unit Controller with Optional ECM Motor,
Desuperheater, Electric Heat Coil and I/O Expansion
Module – 208/230/460/60 Hz/3-Phase . . . . . . . . . . . 23
MicroTech III Unit Controller with Optional ECM
Motor, Desuperheater, and I/O Expansion Module
208/230/460/60/3-Phase. . . . . . . . . . . . . . . . . . . . . . 24
MicroTech III Unit Controller with PSC Motor,
Desuperheater and I/O Expansion Module for
Hot Gas Reheat Control (Unit Sizes 019-070)
208/230/60/1-Phase . . . . . . . . . . . . . . . . . . . . . . . . . 25
Controller Comparison . . . . . . . . . . . . . . . . . . . . . . . 26
Controller Comparison Table. . . . . . . . . . . . . . . . . . . 26
C
ontents
