Lennox MHA Series Installation Instructions Manual page 15

This unit must be properly grounded and protected by a circuit breaker. The ground wire for the unit must not be
connected to a gas or water pipe, a lightning conductor or a telephone ground wire.
Do not connect power wires to the outdoor unit until all other wiring and piping connections have been completed.
Do not install the unit near a lighting appliance that includes a ballast. The ballast may affect remote control operation.
Table 9. Single Zone Installation Wiring Requirements
Systems and Terminal
Designations
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power
L, N and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power
L, N and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power
L1, L2 and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power
L1, L2 and GND
Indoor to Outdoor Wiring
(Communication/Power)
1, 2, 3 and GND
Outdoor to Main Power
L1, L2 and GND
MCA = Minimum Circuit Amps
IMPORTANT
System Capacity System Voltage
09K 115VAC
09K 115VAC
12K 115VAC
12K 115VAC
09K 208/230VAC
09K 208/230VAC
12K 208/230VAC
12K 208/230VAC
18K 208/230VAC
18K 208/230VAC
24K 208/230VAC
24K 208/230VAC
Number of
Wire Type
Conductors
4
3
4
3
4
4
Stranded and
unshielded
4
3
4
3
4
3
15
Wire Gauge /
Minimum Circuit Max Fuse
Ampacity
16AWG / 16A
20A
16AWG / 16A
16AWG / 15A
20A
16AWG / 15A
16AWG / 10A
15A
16AWG / 10A
16AWG / 15A
15A
16AWG / 15A
16AWG / 15A
20A
16AWG / 15A
16AWG / 20A
25A
16AWG / 20A