Trane 4TCC4024A1000A Installer's Manual page 19

Table 10. Field Wiring Diagram
C C o o n n t t r r o o l l W W i i r r i i n n g g ( ( C C l l a a s s s s I I I I ) )
Low voltage control wiring should not be run in conduit
with power wiring unless Class 1 wire of proper voltage
rating is used. Route the thermostat cable or equivalent
single leads of No. 18 AWG colored wire from the
thermostat subbase terminals through the rubber
grommet on the unit. See Figures 1–6 for the control
entry (24V Entry) location. Make connections as shown
on Table 10, p. 19
18-EB30D1-1G-EN
GROUND
WIRE
1 PH 1 PH
POWER POWER
TYPICAL THERMOSTAT
3 PH
3 PH
POWER POWER
UNIT HEATER
NOTE 1,8
UNIT HEATER AREA
UNIT CONTROL
BOX
FIELD PROVIDED
FIELD CONNECTED
WIRED
TO COMPR.
CONTACTOR
SPE
ACCESSORY
KIT
UNIT LOW
VOLTAGE AREA
GROUND
SEE SPEK INSTALLER'S GUIDE
WIRE
FOR ALL OTHER EXAMPLES
1 PH
POWER
SINGLE POWER
3 PH
ENTRY
POWER
UNIT LOW
VOLTAGE AREA
FIELD
INSTALLED
JUMPERS
TYPICAL THERMOSTAT
Do not short thermostat wires since this will damage
the control transformer.
Refer to the table below for recommended wire sizes
and lengths for installing the unit thermostat. The total
resistance of these low voltage wires must not exceed
one (1) ohm. Any resistance in excess of 1 ohm may
cause the control to malfunction because of the
excessive voltage drop.
S S t t e e p p 4 4 — — U U n n i i t t I I n n s s t t a a l l l l a a t t i i o o n n
UNIT CONTROL BOX
POLARIZED
PLUG
COMMON
B
(GR)
G FAN
COMPRESSOR
Y
W1 HEAT FIRST STAGE
HEAT SECOND STAGE
W2
24V
R
FIELD PROVIDED
JUMPER
NOTE 6
TO ECONOMIZER
FACTORY PROVIDED
FIELD INSTALLED WIRES
ELECTRIC
HEATER
CONTROL
BOX
HEATER
UNIT
FUSES
FUSES
UNIT LOW
VOLTAGE AREA
TYPICAL 2-STAGE
THERMOSTAT
B
G
UNIT LOW
Y
VOLTAGE AREA
W1
W2
R
BAY24X042
TYPICAL THERMOSTAT
UNIT HEATER AREA
ELECTRIC
HEATER
CONTROL
BOX
(WH)
(WH)
B
G
Y
W1
W2
R
FIELD
INSTALLED
JUMPERS
NOTE 10
(WH) W1
(WH) W2
FIELD
INSTALLED
JUMPERS
756977i2
19