C.
Ground Connections
WARNING: According to NEC, ANSI/NFPA 70, and local codes, the cabinet must have an uninterrupted or unbroken
ground to minimize personal injury if an electrical fault should occur. The ground may consist of electrical wire or metal
conduit when installed in accordance with existing electrical codes. If conduit connection uses reducing washers, a separate
ground wire must be used. Failure to follow this warning could result in electrical shock, fire, or death.
NOTE:
Use UL-listed conduit and conduit connector for connecting supply wire(s) to unit to obtain proper grounding. Grounding may also be
accomplished by using grounding lugs provided in control box.
D.
Minimum CFM and Motor Speed Selection
Units with or without electric heaters require a minimum CFM. Refer to the unit wiring label to ensure that the fan speed selected is not lower
than the minimum fan speed indicated.
Fan speed selection is done at the fan relay on the printed-circuit board. To change motor speeds, disconnect the fan lead used on the relay terminal
(SPT) and replace with the motor speed tap desired. (See Fig. 14.) Save the insulating cap and place on the motor lead removed from the relay.
NOTE:
In low static applications, lower motor speed tap should be used to reduce possibility of water being blown off coil.
Fig. 12—Wiring Layout Heat Pump Unit (Cooling and 2-Stage Heat with 2 Outdoor Thermostats)
A94062
R
G
C
L
E
O
C
1
4
7
C
9
6
3
Y
THERMOSTAT
R
R
C
O
Y
G
C
W
2
W
2
W
2
W
3
E
FAN COIL
(CONTROL)
EMERGENCY HEAT RELAY
HEAT PUMP
(CONTROL)
ODTS1
ODTS2
RED
GRY
BRN
WHT
BLU
VIO
Fig. 13—Transformer Connections
A94067
230
C
208
BRN
RED
YEL
BLK
SECONDARY
PRIMARY
—8—
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