Hamilton
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Canal
Winchester,
OH
76106
61MH0028A
Page
16
Typical Heat Pump - Heating/Cooling Thermostat Wiring
Connections
1.
Remove the lower access panel.
2.
Remove the control box cover.
3.
Install a grommet in the 3/8” dia hole on the right side of
the air handler casing to protect the thermostat wire cable.
4.
Strip ½” of the insulation on the end of each wire.
5.
Insert the wire cable from the thermostat through the
grommet in the right side of the casing, thru the 3/8”
grommet in the control box and place the thermostat wire
cable next to the low voltage terminal block.
6.
Connect the Red (24 VAC) supply wire from the
thermostat to the red pigtail wire and secure with a wire
nut.
7.
Connect the White (first stage heating) wire from the
thermostat to the white pigtail wire and secure with a wire
nut.
8.
Connect the Green (indoor fan) wire from the thermostat
to the green pigtail wire and secure with a wire nut.
9.
Connect the Brown (24 VAC Common) wire from the
thermostat, the brown pigtail wire and the common wire
from the compressor contactor together and secure all
three wires with a wire nut
10.
Connect the Orange (Reversing Valve Solenoid) wire
from the thermostat with the Orange wire from the “O”
terminal on the condenser unit. Fasten the two wires
together securely with a wire nut.
11.
For 2
nd
stage operation, connect the Black thermostat wire
to the black wire and secure with a wire nut.
12.
If a two-stage outdoor unit is used then connect the “W2”
wire from the outdoor unit to the black wires discussed in
step 12 and secure with a wire nut. Refer to Figure 22.
NOTE:
If single stage thermostat is used on a two-stage air
handler connect the black and the white air handler
pigtail wires and the white thermostat wire together;
then, secure all three wires with a wire nut.
RC
RH
G
Thermostat
R
G
W
C
Air Handler
24 VAC
Transformer
Transformer
Common
Condenser
Outdoor Unit
W/E
C
W2
Y
O
Y
G
W/E
C
T
W2
Y
O
Add Jumper if Outdoor Stat is not used
Optional Outdoor
Temperature Switch
W2
Ju
m
p
er
Figure 22: Typical Heat Pump / 2 Stage Heating /
Cooling Connections
SECTION X: MOTOR, BLOWER AND
FURNACE START UP
Selecting the Constant Torque Blower Speed
This furnace uses the constant torque high efficiency motor.
This motor operates on 240 VAC. The motor speed tap is 24
VAC, 60 Hz, 1 PH. High speed can be changed by removing
the black wire from the “Y” terminal on the low voltage
terminal block (LVTB) and connecting either the blue, orange,
or purple wire to the terminal. The heat speed can also be
changed by removing the blue wire from the “W” terminal on
the LVTB and replacing it with rather the purple or orange
wire. Table 14 shows the constant torque motor lead
connection labeling and the connection definitions. The motor
has two plugs that the wires connect to the motor. One plug
has C, L, G and N. The other plug has the speed taps 1, 2, 3, 4,
and 5. The speed wires must be changed at the LVTB
Terminal
Connection
Color
Wire Gauge
C
Motor Common - 24 VAC Common
Green
22
L
Supply Voltage to the Motor - 240 VAC L1
Black
18
G
Ground Connection
Green
18
N
Supply Voltage to the Motor - 240 VAC L2
White
18
1
Low Voltage Speed Tap - 24 VAC
Red
22
2
Med-Low Voltage Speed Tap - 24 VAC
Orange
22
3
Medium Voltage Speed Tap - 24 VAC
White
22
4
Med-High Voltage Speed Tap - 24 VAC
Blue
22
5
High Voltage Speed Tap - 24 VAC
Black
22
Table 14: Constant Torque Motor Terminal
Connections
Total 24 VAC circuit amps are 0.14 amps.
Change Motor Speeds
1.
Turn off
all
electrical supply circuits to the furnace at
the main circuit panel (House Circuit Breaker) panel.
2.
Remove furnace front door and switch furnace circuit
breaker(s) to “OFF”.
3.
Remove control box cover.
4.
Disconnect the wire from the low voltage terminal
block and reconnect the desired wire to the terminal.
Refer to
Figure 23 and Table 14 for
motor
connections.
Note: Low speed is reserved for constant circulation. This
speed is around 150 CFM. The furnace will not operate at
this speed tap.
5.
Turn the circuit breakers on and reinstall furnace
front door.
To avoid personal injury or property damage, make
certain that the motor leads cannot come into
contact with non-insulated metal components of
the unit.
