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Designation
Description
ACT1...................Actuator Motor, Supply Fan Vanes...............................Supply Air Sect.
ACT2...................Actuator Motor, Return Fan Vanes ...............................Return Air Sect.
ACT3, 4...............Actuator Motors, Economizer Dampers .......................Economizer Sect.
ACT5...................Actuator Motor, Discharge Isolation Damper
ACT6...................Actuator Motor, Return Air Isolation Damper................Return Air Sect.
ACT 10, 11.... .... Actuator Motors, Exhaust Dampers ..............................Return Air Sect.
ADI......................ADI Board.....................................................................Main Control Box
AS .......................Blower Air Switch .........................................................Furnace Sect.
BM ......................Burner Blower Motor ....................................................Furnace Sect.
Cl, 5 ....................Power Factor Capacitors. Compressor #1 ...................Condenser Sect.
C2, 6 ...................Power Factor Capacitors, Compressor #2 ...................Condenser Sect.
C9, 10 .................Power Factor Capacitors, Supply Fan .........................Supply Air Sect.
C11 .....................Capacitor, Speed Trol (Circuit #1) ................................Cond. Bulkhead
C19. 20 ...............Power Factor Capacitors, Return Fan..........................Return Air Fan
C21 .....................Capacitor, SpeedTrol (Circuit #2) .................................Cond. Bulkhead
COMPR.#1, 2 .... Compressors 1 & 2 ......................................................Condenser Sect.
CS1, 2.................Control Switches, Refrigerant Circuits..........................Cond. Control Box
DHL.....................Duct High Limit .............................................................Main Control Box
DS1.....................Disconnect, Total Unit or Condenser/Heat ...................Main Control Box
DS2.....................Disconnect, SAF/RAF/Controls ....................................Main Control Box
DS3.....................Disconnect, Electric Heat .............................................Electric Heat Sect.
DS4.....................Disconnect, Condenser ................................................Cond. Control Box
Fl.........................Fuse, Control Circuit ....................................................Main Control Box
F2........................Fuse, Control Circuit ....................................................Cond. Control Box
F3........................Fuse, Burner Motor ......................................................Main Control Box
FBi, 2 ..................Fuseblocks, Compressor #1 & #2 ................................Cond./Fuse Ctrl Box
FB8 .....................Fuseblock, Main Transformer.......................................Main Control Box
FB9, 10 ...............Fuseblocks, Supply Fan ...............................................Main Control Box
FB11-18 ..............Fuseblocks, Condenser Fans ......................................Cond. Control Box
FB19, 20 .............Fuseblocks, Return Fan ...............................................Main Control Box
FB31-40 ..............Fuseblocks, Electric Heat (Top Bank) ..........................Electric Heat Sect.
FB41-50 ..............Fuseblocks, Electric Heat (Bottom Bank).....................Electric Heat Sect.
FD .......................Flame Detector.............................................................Furnace Sect.
FLC .....................Fan Limit Control ..........................................................Furnace Sect.
FS1 .....................Freezestat Control........................................................Heat Sect.
FSG ....................Flame Safeguard..........................................................Furnace Sect.
GFS1/GFR1....... Ground Fault Sensor/Relay, RPS Unit .........................Main Control Box
GFS3/GFR2... ... Ground Fault Sensor/Relay, RCS Unit .........................Cond. Control Box
GRD....................Ground .........................................................................All Control Boxes
GV1.....................Gas Valve, Pilot ............................................................Furnace Sect.
GV2, 3.................Gas Valves, Main .........................................................Furnace Sect.
HL1-10 ................High Limits, Elec. Heaters, Power (Top Bank) .............Electric Heat Sect.
HL11-20 .............. High Limits, Elec. Heaters, Power (Bottom Bank) .... .. Electric Heat Sect.
HL22 ...................High Limit, Gas Heat (Prefilters)...................................Supply Air Sect.
HL23 ...................High Limit, Gas Heat (Final Filter) ................................Final Filter Sect.
HL31-40 ..............High Limits, Elec. Heaters, Control (Top Bank) ....... .... Electric Heat Sect.
HL41-50 ..............High Limits, Elec. Heaters, Control (Bottom Bank) ......Electric Heat Sect.
HP1, 2.................High Pressure Controls, Refrigerant ............................On Compr. #1, #2
HP5.....................High Pressure Control. Gas .........................................Furnace Sect.
HS1.....................Heat Switch, Electric, Shutdown ..................................Main Control Box
HTR1, 2 ..............Crankcase Heaters ......................................................On Compr. #1. #2
IT.........................Ignition Transformer .....................................................Furnace Sect.
LP1, 2 .................Low Pressure Controls, Refrigerant .............................On Compr.
LP5 .....................Low Pressure Control, Gas ..........................................Furnace Sect.
LT2......................Light, Furnace On ........................................................Furnace Sect.
LT3......................Light, Pilot Gas Valve On .............................................Furnace Sect.
LT4......................Light, Main Gas Valve On.............................................Furnace Sect.
LT10....................Light, Supply Fan .........................................................Supply Air Sect.
LT11 ....................Light, Return Fan .........................................................Return Air Sect.
LT12....................Light, Heat Section .......................................................Heat Sect.
LT13....................Light, Filter Section ......................................................Filter Sect.
LT14....................Light, Final Filter Section..............................................Final Filter Sect.
LTI 5....................Light, Discharge Section ..............................................Discharge Sect.
LT16....................Light, Blow-through Coil Section ..................................Blow-thru Coil Sect.
LT17....................Light, Evaporator Coil Section......................................Evaporator Coil Sect
LT18....................Light, Preheat Section ..................................................Preheat Sect.
LT19....................Light, Blank Section .....................................................Blank Sect.
LT20....................Light, Blank Compartment............................................Blank Compartment
LT22....................Light, Condenser Section .............................................Condenser Sect.
M1, 5...................Contactors, Compressor #1 .........................................Cond. Control Box
M2, 6...................Contactors, Compressor #2 .........................................Cond. Control Box
Mg, 10.................Contactors, Supply Fan................................................Main Control Box
M11-18................Contactors, Condenser Fans, Circuit #1 ......................Cond. Control Box
M19, 20...............Contactors, Return Fan ................................................Main Control Box
M21-28................Contactors, Condenser Fans, Circuit #2 ......................Cond. Control Box
M29.....................Contactor, Burner Motor ...............................................Furnace Sect.
M31-39................Contactors, Elec. Heaters (Top Bank) ..........................Electric Heat Sect.
M41-50................Contactors, EIec. Heaters (Bottom Bank) ....................Electric Heat Sect.
MAT ....................Mixed Air Temperature Sensor.....................................Supply Air Sect.
MCB1..................Microprocessor Control Board #1 ................................Main Control Box
MJ .......................Mechanical Jumpers ....................................................Terminal Blocks
MP1, 2 ................Motor Protectors, Compressor #1, #2 ..........................On Compr. #1, #2
NB1, 2.................Neutral Blocks ..............................................................Main Control Box
NB3.....................Neutral Block................................................................Cond. Control Box
OAE ....................Outside Air Enthalpy Control ........................................Economizer Sect.
OAT..................... Outside Air Temperature Sensor .................................Discharge Bulkhead
OBA ................... Output Board A, Standard ............................................Main Control Box
OBB ................... Output Board B, Cooling...............................................Main Control Box
OBC ................... Output Board C, Heating ..............................................Main Control Box
OL9, 10 .............. Overload Relays, Supply Fan .......................................Main Control Box
OL19, 20 ............ Overload Relays, Return Fan .......................................Main Control Box
OP1, 2................ Oil Pressure Controls, Compr. #1, #2 ...........................Cond. Control Box
Page 54
Wiring Diagrams
Legend
Std. Location
DesignatIon
PB1 .................... Powerblock. Total Unit or Cond/Heat ............................Main Control Box
PB2 .................... Powerblock, SAF/RAF/Controls....................................Main Control Box
PB3 .................... Powerblock, Electric Heat .............................................Electric Heat Sect.
Discharge Sect.
PB4 .................... Powerblock, Condenser................................................Cond. Control Box
PB9, 10 .............. Powerblocks, Supply Fan .............................................Unit Split Jct. Box
PB19, 20 ............ Powerblocks, Return Fan .............................................Unit Split Jct. Box
PC5 .................... Pressure Control, Clogged Filter...................................Filter Sect.
PC6 .................... Pressure Control. Clogged Final Filter..........................Final Filter Sect.
PC7 .................... Pressure Control, Proof of Airflow.................................Supply Air Filter
PC8 .................... Pressure Control, Minimum Airflow...............................Evaporator Coil Sect
PC12, 22 ............ Pressure Control, FanTrol.............................................Cond. Bulkhead
PM1.................... Phone Modem ..............................................................Main Control Box
PS1, 2 ................ Pumpdown Switches, Refrigerant Circuits....................Cond. Control Box
PS3 .................... Pumpdown Switch, Unit ................................................Main Control Box
PVM1 ................. Phase Voltage Monitor, RPS Unit .................................Main Control Box
PVM2 ................. Phase Voltage Monitor, RCS Unit .................................Cond./Fuse Ctrl Box
R1, 2 .................. Relays, High Pressure Reset........................................Cond. Control Box
R5, 6 .................. Relays, Compressor #1, #2 Safety/Cool Fall ................Cond. Control Box
R9, 10 ................ Relays, Compressor Lockout........................................Cond. Control Box
R11, 12............... Relays, Low Ambient ....................................................Cond. Control Box
R20 .................... Relay, Gas, Steam, Hot Water Heat .............................Main Control Box
R21, 22 .............. Relays, Gas Heat, 100% OA ........................................Furnace Sect.
R23 .................... Relay, Gas Heat, Modulating Valve ..............................Furnace Sect.
R24 .................... Relay, Gas Heat Alarm .................................................Main Control Box
R26 .................... Relay, Occupied/Unoccupied........................................Main Control Box
R27 .................... Relay, Exhaust Dampers ..............................................Main Control Box
R28 .................... Relay, Isolation Dampers ..............................................Main Control Box
R60-69 ............... Relays, Special .............................................................Main Control Box
RAE.................... Return Air Enthalpy Sensor ..........................................Return Air Sect.
RAT .................... Return Air Temperature Sensor ....................................Return Air Sect.
REC1 ................. Receptacle, Main Box ...................................................Main Control Box
REC2 ................. Receptacle, Condenser Box .........................................Cond. Control Box
REC3 ................. Receptacle, Field Power, 115V .....................................Discharge Bulkhead
REC10-22 .......... Receptacles, Cabinet Section.......................................Cabinet Sections
S1....................... Switch, System On/Off, RPS Unit .................................Main Control Box
S2....................... Switch, System On/Off, RCS Unit.................................Cond. Control Box
S3....................... Switch, Furnace On/Off.................................................Furnace Sect.
S6....................... Switch, Return Fan Vanes Adjustment .........................Main Control Box
S10-22 ............... Switches, Cabinet Section Lights .................................Cabinet Sections
SAT .................... Supply Air Temperature Sensor ....................................Discharge Sect.
SB1 .................... Staging Board #1, Cooling ............................................Main Control Box
SB2 .................... Staging Board #2, Heating............................................Main Control Box
SC11 .................. Speed Control, Circuit #1..............................................Cond. Bulkhead
SC21 .................. Speed Control, Circuit #2..............................................Cond. Bulkhead
SD1 .................... Smoke Detector, Supply Air ..........................................Discharge Sect.
SD2 .................... Smoke Detector, Return Air ..........................................Return Air Sect.
SPS1, 2.............. Static Pressure Sensors, Duct or Building ....................Main Control Box
SPS5.................. Static Pressure Sensor, Clogged Filter .........................Filter Sect.
SPS6.................. Static Pressure Sensor, Clogged Final Filter ................Final Filter Sect.
SR1-3................. Sequence Relays, Electric Heat ...................................Electric Heat Sect.
SV1, 2 ................ Solenoid Valves, Liquid.................................................Discharge Bulkhead
SV5-6 ................. Solenoid Valves, Hot Gas .............................................Discharge Bulkhead
T1....................... Transformer, Main Control ............................................Main Control Box
T2....................... Transformer. Unit 24V...................................................Main Control Box
T3....................... Transformer, Controller, 18V.........................................Main Control Box
T4....................... Transformer, Exhaust Dampers ....................................Main Control Box
T5....................... Transformer, Electric Heat ............................................Electric Heat Sect.
17 ....................... Transformer, Gas Pilot Valve ........................................Furnace Sect.
T8....................... Transformer. Gas Main Valve........................................Furnace Sect.
T10..................... Transformer, SpeedTrol, 24V........................................Cond. Control Box
T11 ..................... Transformer, SpeedTrol, 230V......................................Cond. Control Sect.
TB1 .................... Terminal Block, 115V, Field ...........................................Main/Cond. Ctrl Box
TB2 .................... Terminal Block, 24V, Field.............................................Main/Cond. Ctrl Box
TB3, 4 ................ Terminal Blocks, Condenser .........................................Cond. Control Box
TB5 .................... Terminal Block, 115V, Factory.......................................Main Control Box
TB6 .................... Terminal Block, 115V/24V. Factory ...............................Main Control Box
TB7, 8 ................ Terminal Block, 24V, Factory ........................................Main Control Box
TB10 .................. Terminal Block, Heating ................................................Main Control Box
TB11................... Terminal Block, Heating ................................................Electric Heat Sect.
TB12, 13 ............ Terminal Blocks, Electric Heat, Power ..........................Electric Heat Sect.
TB25 .................. Terminal Block, 11 5V, Factory......................................Unit Split, Jct. Box
TB27, 28 ............ Terminal Blocks, 24V, Factory.......................................Unit Split. Jct. Box
TC1, 2 ................ Temperature Controls, FanTrol .....................................Cond. Control Box
TD1, 2 ................ Time Delays. Compr. #1, #2, Lockout...........................Cond. Control Box
TD5, 6 ................ Time Delays, Compr. #1, #2, Part Winding...................Cond. Control Box
TD9 .................... Time Delay, Supply Fan Part Winding ..........................Main Control Box
TD11, 12 ............ Time Delays, Low Ambient ...........................................Cond. Control Box
TD19 .................. Time Delays, Return Fan Part Winding ........................Main Control Box
U1, 2 .................. Unloaders, Compressors ..............................................On Compressors
VM1.................... Valve Motor #1, Heating................................................Heating Sect.
ZNT1 .................. Zone Temperature Sensor, Control...............................Field Installed
ZNT2-5............... Zone Temperature Sensors, Special.............................Field Installed
Description
Std. Location
IM-738
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