Page 34 / IM 178
Wiring Diagrams
Wiring Diagrams
Legend
Designation
Description
Std. Location
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 ........... Discharge Sect.
ACT6 .................. Actuator Motor, Return Air Isolation Damper ........... Return Air Sect.
ACT7, 8 .............. Actuator Motors, Face & Bypass Dampers .............. Coil Sect.
ACT 10, 11 ........ Actuator Motors, Exhaust Dampers .......................... Return Air Sect.
ADI ..................... ADI Board ................................................................... Main Control Box
AFD10 ................ Adj. Freq. Drive, SupplyFan ....................................... AFD Access Sect.
AFD20 ................ Adj. Freq. Drive, Return Fan ...................................... AFD Access Sect.
AS ...................... Blower Air Switch ....................................................... Furnace Sect.
BM ..................... Burner Blower Motor ................................................. Furnace Sect.
C9, 10 ................ Power Factor Capacitors, Supply Fan ...................... Supply Air Sect.
C19, 20 .............. Power Factor Capacitors, Return Fan ...................... Return Air Fan
DHL .................... Duct High Limit .......................................................... Main Control Box
DS1 .................... Disconnect, Total Unit or Heat .................................. Main Control Box
DS2 .................... Disconnect, SAF/RAF/Controls ................................. Main Control Box
DS3 .................... Disconnect, Electric Heat .......................................... Electric Heat Sect.
F1 ....................... Fuse, Control Circuit .................................................. Main Control Box
F3 ....................... Fuse, Burner Motor .................................................... Main Control Box
FB8 .................... Fuseblock, Main Transformer .................................... Main Control Box
FB9, 10 .............. Fuseblocks, Supply Fan ............................................ Main 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
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.
HP5 .................... High Pressure Control, Gas ....................................... Furnace Sect.
HS1 .................... Heat Switch, Electric, Shutdown ............................... Main Control Box
IT ........................ Ignition Transformer ................................................... Furnace Sect.
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.
LT15 ................... 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
LT21 ................... Light, Draw-through Coil Section .............................. Draw-thru Coil Sect.
M9, 10 ................ Contactors, Supply Fan ............................................. Main Control Box
M19, 20 ............. Contactors, Return Fan ............................................. Main Control Box
M29 .................... Contactor, Burner Motor ............................................ Furnace Sect.
M30 .................... Contactor, Supply AFD Bypass ................................. AFD Access Sect.
M31-39 .............. Contactors, Elec. Heaters (Top Bank) ....................... Electric Heat Sect.
M40 .................... Contactor, Return AFD Bypass ................................. AFD Access Sect.
M41-50 .............. Contactors, Elec. 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
NB1, 2 ................ Neutral Blocks ............................................................ Main Control Box
Designation
Description
Std. Location
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
PB1 .................... Powerblock, Total Unit or Heat .................................. Main Control Box
PB2 .................... Powerblock, SAF/RAF/Controls ................................ Main Control Box
PB3 .................... Powerblock, Electric Heat ......................................... Electric Heat Sect.
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.
PM1 ................... Phone Modem ............................................................ Main Control Box
PVM1 ................. Phase Voltage Monitor, RPS Unit .............................. Main 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
REC3 ................. Receptacle, Field Power, 115V .................................. Discharge Bulkhead
REC10-22 .......... Receptacles, Cabinet Section ................................... Cabinet Sections
S1 ....................... Switch, System On/Off, RPS Unit ............................. Main Control Box
S3 ....................... Switch, Furnace On/Off ............................................. Furnace Sect.
S4, 5 .................. Switches, AFD Bypasses ........................................... Main Control Box
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
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.
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.
T7 ....................... Transformer, Gas Pilot Valve ...................................... Furnace Sect.
T8 ....................... Transformer, Gas Main Valve ..................................... Furnace Sect.
TB1 .................... Terminal Block, 115V, Field ........................................ Main/Cond. Ctrl Box
TB2 .................... Terminal Block, 24V, Field .......................................... Main/Cond. Ctrl 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, 115V, Factory ................................... Unit Split, Jct. Box
TB27, 28 ............ Terminal Blocks, 24V, Factory ................................... Unit Split, Jct. Box
TD9 .................... Time Delay, Supply Fan Part Winding ....................... Main Control Box
TD19 .................. Time Delays, Return Fan Part Winding ..................... Main Control Box
VM1 ................... Valve Motor #1, Heating ............................................ Heating Sect.
VM5 ................... Valve Motor #1, Cooling ............................................ Cooling Sect.
VV1 .................... Vent Valve, Gas Heat ................................................. Furnace Sect.
ZNT1 .................. Zone Temperature Sensor, Control ........................... Field Installed
ZNT2-5 .............. Zone Temperature Sensors, Special ......................... Field Installed
GENERAL NOTES
1.
2.
3.
4.
5.
6.
Field Wiring
Wiring in Remote Unit
Wiring Between Boxes
Shielded Wire Cable
Main Control Box
(Terminals)
Cond/Heat Control Box
(Terminals)
7.
8.
9.
10.
11.
12.
200
Field Wiring Terminal
Remote Panel Terminal
Wire Connector
Plug-in Connector
Wire Number
Option Block
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