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APRILAIRE MODEL 8344
OR 8363 THERMOSTAT
FAN
RELAY
1ST
STAGE
HEAT
R
FURNACE
C
G
Y1
W1
1ST STAGE COOL
L1
L2
120
VAC
24
VAC
1ST
STG
COOL
COOLING EQUIPMENT
Y1
C
LO
HI
W
Y
G
RC
RH
HI opens at 100°F±9°F
LO closes at 41°F±9°F
AUTO
ON
GAS
ELEC
Step 5. Wire the thermostat
IMPORTANT! ENSURE THE POWER AT THE HVAC EQUIPMENT IS OFF.
1. Make sure the fan switch is set to Auto and the Mode switch is set to Off.
2. Strip 2” of cable insulation.
3. Strip 1/4” of insulation from each wire. Do not cut into the wire when
stripping insulation, as this can lead to eventual control failure.
4. Secure the wires to the thermostat terminal strip according to the wiring
diagram for the model being installed (See Diagrams 1, 2 & 3). Use a slotted
screw driver with a 1/8” tip (terminal screw driver). Use color coding
where possible (i.e. red wire to R terminal, white wire to W terminal, etc.).
5. Slide excess cable back into the wire entry wall opening and fill the hole
with insulation. Failure to seal the hole can cause drafts to enter the
thermostat and effect temperature sensing accuracy.
6
Diagram 1 – Model 8344 or 8363 Thermostat Wiring