035-15266-003Rev.A(0804)
CAUTION
When using separate thermostats, a thermostat
interlock system must be provided to prevent simul-
taneous operation of the furnace and air conditioner.
Simultaneous operation can result in coach over-
heating, equipment damage and energy waste. (See
Figures 15 and 16.)
Do not connect Yellow wire to thermostat until an
outdoor unit is instafled.
COOLING HEATING
THERMOSTAT THERMOSTAT
DOUB %L o% ,TCH
TO TO
AiR CONDITIONER FURNACE
FIGURE 15 : THERMOSTATWIRING
The EB*B* Furnaces are A/C ready.
All furnaces installations should include a minimum of four conductor thermostat
wiring to accommodate future air conditioning installations,
THERMOSTAT WiRiNG SCHEMATIC FOR: BLEND AIR AND FURNACE
RED
NOT FACTORY
INSTALLED
Z
uJ
uJ
©
WIRES FROM FURNACE
STANDARD OR DELUXE
BLEND AIR CONTROL BOX
Four-conductor wire is required for thermostat connection,
Attach the 4 low voltage wires extending from the control box as follows:
1. RED wire from Furnace to thermostat RED wire.
2. WHITE wire from Furnace to thermostat WHITE wire.
3. GREEN wire from Furnace to thermostat GREEN wire.
4. BLACK wire from Furnace to condensing unit contactor.
5. Thermostat YELLOW wire to condensing unit contactor.
FIGURE 16 : THERMOSTATWIRING
OPTIONAL AIR CONDITIONING
ACCESSORIES
Failure to install this insulation and coil shelf kit
could result in damage to equipment and/or per-
sonal injury. Liability and warranty from the manu-
facturer could also be void.
This furnace is already equipped with a blower and control
system to add-on air conditioning up to 4 tons and heat pump
up to 3-1t2 tons. Insulation and coil shelf kit (3500-8941" for
downflow or 3500-8961" for upflow) must be installed when
adding on such remote air conditioning systems.
10 Unitary Products Group
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