Carrier 50PG20 Installation Instructions Manual page 11

LEGEND
EQUIP - Equipment
GND - Ground
NEC - National Electrical Code
TB - Terminal Board
NOTE: The maximum wire size for TB1 is 2/0
Fig. 12 --- Field Power Wiring Connections
Field wiring must conform to temperature limitations for type "T"
wire. All field wiring must comply with NEC and local
requirements.
Operating voltage to compressor must be within voltage range
indicated on unit nameplate. On 3-phase units, voltages between
phases must be balanced within 2%.
Unit failure as a result of operation on improper line voltage or
excessive phase imbalance constitutes abuse and may cause
damage to electrical components.
Field Control Wiring (Units Without Optional
Humidi- - MiZert Adaptive Dehumidification System)
Unit can be controlled with either a Carrier-approved accessory
thermostat or a Carrier-approved space temperature sensor. Install
thermostat according to the installation instructions included with
accessory. Locate thermostat assembly or space temperature sensor
on a solid interior wall in the conditioned space to sense average
temperature.
Route thermostat or space temperature sensor cable or equivalent
single leads of colored wire from subbase terminals through
conduit into unit to low-voltage connections as shown on unit label
wiring diagram and in Fig. 13 or 14.
NOTE: For wire runs up to 50 ft, use no. 18 AWG (American
Wire Gauge) insulated wire (35_C minimum). For 50 to 75 ft, use
no. 16 AWG insulated wire (35_C minimum). For over 75 ft, use
no. 14 AWG insulated wire (35_C minimum). All wire larger than
no. 18 AWG cannot be directly connected at the thermostat and
will require a junction box and splice at the thermostat.
REMOV ABLE JUMPER
RH RC
TB2-
R
J11
1
Fig. 13 --- Field Control Thermostat Wiring
T -55 SPT
C06293
T1
TB2-J12
1
ROOFTOP UNIT
Fig. 14 --- Field Control Space Temperature Sensor Wiring
11
THERMOST A T ASSEMBL Y
Y1 Y2 W1 W2 G
Y1 Y2 W1 W2 G
2 3 4 5 6
ROOFTOP UNIT
T -56 SPT
T2 TH COM
2 3
L
C X
C X
7 8
C06298
SN
C06294