18-HB20D4-1E-EN
7
Field Wiring – Air Conditioners
Notes:
1.
Fused disconnect size,
power wiring and grounding
of equipment must comply
with codes..
2.
Be sure power supply agrees
with equipment and heater
nameplate.
3.
Low voltage wiring to be 18
AWG minimum conductor.
4.
See heater nameplate for
current rating of heater
used.
5.
See unit and heater
diagram for electrical
connection details.
6.
Jumper must be connected
between 1 and 2 for fan to
operate in heating.
7.
Some thermostats provide
the ‘G’ signal in the cooling
mode only. To provide the ‘G’
signal in the heating mode
an accessory relay is
required. See fig. 3 for
proper connections.
8.
For cooling only omit the
electric heater, associated
power wires and the ‘W’
signal thermostat wire.
9.
Fig. 4 demonstrates
connection of the two stage
electric heat thermostat
accessory only. For further
unit connection details refer
to the other figures.
10. The 41A (BR) wire is first
stage electric heat. If the
electric heater accessory has
two heating stages the 41C
(BR) wire is second stage
electric heat.
Figure 2. Field Wiring
B
G
Y
W1
W2
R
COMMON
FAN
COMPRESSOR
HEAT FIRST STAGE
HEAT SECOND STAGE
24V
(GR)
(WH)
(WH)
B
G
Y
W1
W2
R
B
G
Y
W1
W2
R
3 PH
POWER
UNIT
NOTE 1,8
3 PH
POWER
HEATER
1 PH
POWER
1 PH
POWER
FIELD PROVIDED
JUMPER
NOTE 6
TO ECONOMIZER
FACTORY PROVIDED
FIELD INSTALLED WIRES
FIELD
INSTALLED
JUMPERS
FIELD
INSTALLED
JUMPERS
FIELD
INSTALLED
JUMPERS
756977i2
FIELD PROVIDED
FIELD CONNECTED
WIRED
UNIT HEATER AREA
UNIT CONTROL
BOX
ELECTRIC
HEATER
CONTROL
BOX
HEATER
FUSES
UNIT
FUSES
GROUND
WIRE
UNIT LOW
VOLTAGE AREA
UNIT LOW
VOLTAGE AREA
SINGLE POWER
ENTRY
UNIT LOW
VOLTAGE AREA
3 PH
POWER
1 PH
POWER
BAY24X042
TYPICAL THERMOSTAT
TYPICAL THERMOSTAT
TYPICAL 2-STAGE
THERMOSTAT
UNIT LOW
VOLTAGE AREA
NOTE 10
ELECTRIC
HEATER
CONTROL
BOX
UNIT CONTROL BOX
UNIT HEATER AREA
TYPICAL THERMOSTAT
TO COMPR.
CONTACTOR
SPE
ACCESSORY
KIT
GROUND
WIRE
POLARIZED
PLUG
W1
W2
(WH)
(WH)
SEE SPEK INSTALLER'S GUIDE
FOR ALL OTHER EXAMPLES
