123
LEGEND AND NOTES FOR FIG. 20-29
LEGEND
NOTES:
1. Factory wiring is in accordance with the National Electrical Codes.
Any field modifications or additions must be in compliance with all
applicable codes.
2. Use 75° C min wire for field power supply, use copper wires for all
units.
3. All circuit breakers “Must Trip Amps” are equal to or less than
156% RLA.
4. Compressor and fan motors are thermally protected — three phase
motors protected against primary single phase conditions.
5. Red jumper wire must be added between R, W1, and W2 for space
temperature sensor and all VAV units with heat and temporarily
during Service Test mode when the heaters need to operate.
A
—
Circuit A
AUX
—
Auxiliary Contact
B
—
Circuit B
BP
—
Building Pressure Transducer
C
—
Contactor, Compressor
CAP
—
Capacitor
CB
—
Circuit Breaker
CCB
—
Control Circuit Breaker
CCH
—
Crankcase Heater
CCN
—
Carrier Comfort Network
®
CCT
—
Cooling Coil Thermistor
CEM
—
Controls Expansion Module
CMR
—
Compressor Modulation Relay
COMP
—
Compressor Motor
CR
—
Control Relay
CS
—
Compressor Safety
CSB
—
Compressor Current Sensing Board
DP
—
Duct Pressure Sensor
DPT
—
Discharge Pressure Transducer
DS
—
Disconnect Switch
DTT
—
Digital Scroll Discharge Temperature
Thermistor
DUS
—
Digital Unloader Solenoid
ECB-1
—
Economizer Control Board
ECB-2
—
Building and Supplier Air Control Board
EDT
—
Evaporator Discharge Air Temperature
EXV
—
Expansion Valve Control Board
FIOP
—
Factory-Installed Option
FS
—
Flame Sensor
FU
—
Fuse
GND
—
Ground
GSF
—
Greenspeed Fuse Block
GST
—
Greenspeed Terminal Block
GSV
—
Greenspeed VFD
HC
—
Heat Contactor
HGBP
—
Hot Gas Bypass
HIR
—
Heat Interlock Relay
HMV
—
Humidi-MiZer Valve
HPS
—
High Pressure Switch
HR
—
Heat Relay
HS
—
Hall Effect Induced Draft Motor Switch
HVS
—
Humidi-MiZer Valve Solenoid
IAQ
—
Indoor Air Quality
IDF
—
Induced Draft Fan
IDM
—
Induced Draft Motor
IFC
—
Indoor Fan Contactor
IFCB
—
Indoor Fan Circuit Breaker
IFM
—
Indoor Fan Motor
IGC
—
Integrated Gas Control Board
IP
—
Internal Compressor Protector
LAT
—
Staged Gas Temperature Sensor
LEN
—
Local Equipment Network
LS
—
Limit Switch
MBB
—
Main Base Board
MCHX
—
Microchannel Heat Exchanger
MGV
—
Main Gas Valve
NEC
—
National Electrical Code
OARH
—
Outdoor Air Relative Humidity
OAT
—
Outdoor Air Temperature Sensor
OFC
—
Outdoor Fan Contactor
OFM
—
Outdoor Fan Motor
PEC
—
Power Exhaust Contactor
PEM
—
Power Exhaust Motor
PL
—
Plug
PLP
—
Phase Loss Protection
RARH —
Return Air Relative Humidity
RAT
—
Return Air Temperature Sensor
RLA
—
Rated Load Amps
RLY
—
Relay
RS
—
Rollout Switch
RTPF —
Round Tube, Plate Fin
RXB
—
Rooftop Control Board
SAT
—
Supply Air Temperature Sensor
SCB
—
Staged Gas Heat Control Board
SCB2 —
Low Ambient Motormaster Board
SCT
—
Saturated Condensing Temperature Sensor
SDU
—
Scrolling Marquee Display
SPT
—
Space Temperature
SST
—
Saturated Suction Temperature Sensor
T-55
—
Room Temperature Sensor
T-56
—
Room Temperature Sensor with Setpoint
TB
—
Terminal Block
TRAN —
Transformer
UPC
—
UPC Open Controller
VAV
—
Variable Air Volume
VFD
—
Variable Frequency Drive
Terminal Block
Terminal (Unmarked)
Terminal (Marked)
Splice
Factory Wiring
Field Wiring
To indicate common potential only.
Not to represent wiring.
To Indicate FIOP or Accessory
THERMOSTAT MARKINGS
BM
—
Blower Motor
C
—
Common
CM
—
Inducer Motor
CS
—
Centrifugal Switch
G
—
Fan
IFO
—
Indoor Fan On
L1
—
Line 1
R
—
Thermostat Power
RT
—
Power Supply
SS
—
Speed Sensor
W1
—
Thermostat Heat Stage 1
W2
—
Thermostat Heat Stage 2
X
—
Alarm Output
Y1
—
Thermostat Cooling Stage 1
Y2
—
Thermostat Cooling Stage 2
Summary of Contents for WEATHERMAKER 48A2020
Page 112: ...112 Fig 20 Typical Main Control Box Wiring Schematic 48 50A Units ...
Page 113: ...113 Fig 21 Typical Auxiliary Control Box Wiring Schematic ...
Page 114: ...114 Fig 22 Typical 2 Stage Gas Heat Wiring Schematic Size 060 Units Shown ...
Page 115: ...115 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown TO NEXT PAGE ...
Page 116: ...116 Fig 23 Typical Staged Gas Heat Wiring Schematic Size 060 Units Shown cont ...
Page 117: ...117 Fig 24 Typical Electric Heat Control Schematic 50 Series Size 060 Units Shown ...
Page 118: ...118 Fig 25 Typical Controls Option Wiring Schematic SW1 SW2 OR DEHUMIDIFY SWITCH ...
Page 119: ...119 Fig 26 Typical Power Schematic 48 50A2 A3 A4 A5 060 Unit Shown ...
Page 120: ...120 Fig 27 Typical Power Schematic of Greenspeed Low Ambient Option 48 50A 060 Unit Shown ...
Page 121: ...121 Fig 28 Typical Small Chassis Component Location Size 020 035 Units ...
Page 122: ...122 Fig 29 Typical Large Chassis Component Locations Size 040 060 Units ...
Page 185: ...185 APPENDIX C VFD INFORMATION cont Fig F Internal Enclosure Fan Replacement A48 7716 ...