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Table 10: Electrical Legend
ID
Description
Standard location
ACT3
Actuator motor, economizer
Coil section
ACT4
Actuator motor, water
regulating/bypass valve
Coil section
CB10
Circuit breaker, supply fan,
electric heat, compressors 1-8
Main control box
DAT
Discharge air
temperature sensor
Discharge section
DHL
Duct hi-limit
Main control box
DS1
Disconnect, total unit or
electric heat/compressor
Main control box
DS2
Disconnect, SAF/controls
Main control box
EXP A, B, C
MTIII expansion modules
Main control box
EWT
Entering water temp . sensor
Coil section
F1A, B
Fuse, control circuit transformer
(T1), primary
Main control box
F1C
Fuse, control circuit transformer
(T1), secondary
Main control box
FB31-34
Fuseblock, electric heat
Main control box
FS1, FS2
Freezestat control
Coil section, heat/cool
FE
Functional earth ground
Main control box
GRD/PE
Ground
Main control box
HL31-34
Hi-limits, ctl . elect . heaters
Coil section
HP1-8
Hi-pressure controls, refrig .
On compressors
HTR1-8
Crankcase heaters
On compressors
HUM1
Humidistat sensor
Field installed
LP1–8
Low-pressure controls,
refrigeration
On compressors
LR10
Line reactor, supply fan
Main control box
M1–8
Contactor, compressors 1-8
Main control box
M10
Contactor, supply fan
Main control box
M20
Contactor, supply fan,
dual contactor start
Main control box
M21-28
Contactor, compressor,
dual contactor start
Main control box
M30B
(bypass)
Contactor, reversing bypass
SA fan
Main control box
M30I
(inverter)
Contactor, reversing inverter
SA fan
Main control box
M31-34
Contactor, electric heat
Main control box
MAT
Mixed air temp . sensor
Filter section
MCB
Microtech III control board
Main control box
MJ
Mechanical jumper
Main control box
MMP1–8
Manual motor protector,
compressors 1-8
Main control box
MMP10
Manual motor protector,
supply fan
Main control box
MMP20
Motor protector, supply fan, dual
contactor start
Main control box
MMP21-28
Motor protector, compressor,
dual contactor start
Main control box
MMP30
Manual motor protector, inverter
bypass, supply fan
Main control box
MP1–8
Motor protector,
compressors 1–8
On compressors
OAE
Outside air enthalpy sensor
Field installed in outside
duct
OAT
Outside air temperature sensor Field installed in outside
duct
PB1
Power block, total unit or comp/
electric heat
Main control box
PB2
Power block, SAF/controls
Main control box
PB10
Power block, field installed
VFD Main control box
PC5
Pressure control, clogged filter
Main control box
PC7
Pressure control or inductive
relay, proof airflow
Main control box
PVM1, 2
Phase voltage monitor
Main control box
R3–8
Relay, hi-pressure
Main control box
R45
Relay, UV lights
Main control box
ID
Description
Standard location
RAT
Return air temperature sensor
Field installed in return
duct
S1
Controls power
Main control box
S4
Inverter/off/bypass
Main control box
S7
Controls/on/auto
Main control box
S21
Fan interlock door switch
Fan section
S40-45
Switches, door interlock,
UV lights
Coil/access section
SD1
Smoke detector, supply
Supply fan section
SHS1
Space humidity sensor
Field installed
SPS1, 2
Static pressure sensors,
duct/building
Main control box
SV1, 2
Solenoid valves, liquid
Comp/cond section
SV5, 6
Solenoid valves, HGBP
Coil/access section
T1
Transformer, main control and
UV lights (line/115 VAC)
Main control box
T2
Transformer, control input
(115/24 VAC)
Main control box
T3
Transformer, control output
(115/24 VAC)
Main control box
TB1
Terminal block, internal
Main control box
TB2
Terminal block, field, class 2
Main control box
TB3
Terminal blocks, factory
Main control box
TB4
Terminal block, field, 115 VAC
Main control box
UV
Ultra-violet light(s)
Coil/access section
VFD10
Adjustable freq . drive,
supply fan
Main control box
VM1
Valve motor #1, heating
Field provided and
installed
VM5
Valve motor #5, cooling
Coil/access section
ZNT1
Zone temp . sensor, setback
Field installed in zone
General Notes
1 .
Field wiring
2 .
Factory wiring
3 .
Shielded wire/cable
4 .
Main control box terminals
5 .
Auxiliary box terminals
6 .
Field terminals
7 .
Plug connector
8 .
Wire/harness number
9 .
Wire nut/ID
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IM 1032-2 • Self-Contained Air Conditioning Systems