Typical Wiring Diagrams - McQuay MicroTech II Installation And Maintenance Manual

Typical Wiring Diagrams

The following vertical self-contained unit wiring diagrams
are typical. They are included here to show common factory
and field wiring schemes. For exact wiring information
pertaining to a particular unit, refer to the wiring diagrams
supplied with the unit.
Table 22: Electrical schematic legend
Designation Description
ACT1 Actuator,variable Inlet Vanes
ACT2 Actuator,bypass Valve
ACT3 Actuator,waterside Economizer
AFD10 Adjust.frequency Drive--supply Fan
CCB1,2 Compr Control Boards--refrig. Circuits
COMPR#1-6 Compressors #1--6
DAT Discharge Air Temp. Sensor
DHL Duct Hi-limit
DS1 Disconnect--total Unit Or Cond/heat
DS2 Disconnect--saf/raf/controls
EWT Ent. Cond. Water Sensor
F1 Fuse--control Circuit
FB10 Fuseblock--supply Fan
FB11,12 Fuseblocks--electric Heat
FB1--6 Fuseblocks--compressor #1-6
FB8 Fuseblock--main Transformer
FP1-6 Frost Protection--refrig. Circuits
FS1 Freezestat Control
GRD Ground
HL13-14 Hi-limits, Pwr, Elec Heaters
HP1-6 Hi-pressure Controls, Refrig
HTR-11,12 Electric Heaters
HTR-15,16 Electric Heaters
HTR1-6 Crankcase Heaters
HUM1 Humidstat Sensor
LP1-6 Lo-pressure Controls, Refrig
LWT Leaving Cond. Water Sensor
M10 Contactor--supply Fan
M11,12 Contactors--electric Heat Control
M13,14 Contactors--electric Heat Safety
M15,16 Contactors--electric Heat Control
M1-6 Contactors--compr#1-6
M17,18 Contactors--electric Heat Safety
M30 Contactor--inverter Bypass
MAT Mixed Air Temp Sensor
MCB1 Microprocessor Circuit Board #1
MJ Mechanical Jumpers
MP1-6 Motor Protector--compr#1-6
NB1 Neutral Blocks
McQuay IM 710-1
Note: Some of the component designations depend on unit
Standard Location Designation
Supply Fan Section OAE
Condenser Valve OAT
Waterside Econo Valve OL10
Main Control PB1
Main Control PB2
Compressor Section PC5
Near Fan Inlet PC7
Fan Section PM1
Main Control PSR1,2
Main Control PVM1
Cond. Water Inlet PVM2
Main Control R11
Main Control R12
Main Control R1-6
Main Control R18
Main Control R67
Evap. Coil RAE
Bt/dt Coil RAT
All Control Box S1
Electric Heat Jct.box S4,5
On Compressors #1-6 S7
Dx Coil S8
Dx Coil S9
On Compressors #1-6 SD1
External SD2
On Compressors #1-6 SPS1,2
Cond. Water Outlet T1
Main Control T2
Main Control T3
Main Control TB10
Main Control TB2
Main Control TB3
Main Control TB4
Main Control TB5
Behind Filters TB6
Main Control TB8
On Teminal Blocks VM1
On Compressors #1-6 VM5
Main Control WF1
ZNT1
sizes. The abridged legend shown in Table 22 applies
to Figures 14 through 20. For complete, exact
component designations and locations, refer to the
legend supplied with the unit.
Description
Outside Air Enthalpy
Outside Air Temp. Sensor
Overload Relay--supply Fan
Power Block--total Unit Or Compr/heat
Power Block--saf/raf/controls
Pressure Control--clogged Filter
Pressure Control--proof Airflow
Phone Modem
Pressure Sensor,refrigerant
Phase Voltage Monitor
Phase Voltage Monitor
Relay--electric Heat Stage 1 Hw/s Close Main Control
Relay--electric Heat Stage 2 Hw/s Open Main Control
Relays--hi-pressure
Relay--cool Enable
Relay--enable Supply Fan
Return Air Enthalpy
Return Air Temp. Sensor
Switch--system On/off
Switches--inverter Bypass
Switch--local On/off To Controller
Switch--cool Enable
Switch--heat
Smoke Detector--supply Fan
Smoke Detector--return Fan
Static Pressure Sensors--duct/bldg
Transformer--main Control (Line/115v)
Transformer--control Input 24v
Transformer--control Output 24v
Terminal Block--
Terminal Block--24v-factory/field
Terminal Block--24v-
Terminal Block--24v-compressor
Terminal Block--115v-factory/field
Terminal Block--115v/24v Factory
Terminal Block--
Valve Motor #1--heating
Valve Motor #5--cooling
Condenser Water Flow Switch
Zone Temp. Sensor--setback
Standard Location
External
External
Main Control
Main Control
Main Control
Fan Section
Fan Section
Main Control
Liq. Shutoff Valves
Main Control
Main Control
Main Control
Main Control
Main Control
External
External
Main Control
Main Control
Main Control
Main Control
Main Control
External
External
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Main Control
Near Hot Water Inlet
Near Chilled Water
Near Condenser
Field Installed
27