Lennox MCA Series Service Manual

7
4. Power and Communication Wiring for
Systems
CAUTION
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 un-
til all other wiring and piping connections have been
completed.
Install all wiring at least 3 feet (1 m) away from televi-
sions, radios or other electronic devices in order to
avoid the possibility of interference with the unit op-
eration.
Do not install the unit near a lighting appliance that in-
cludes a ballast. The ballast may affect remote control
operation.
WARNING
Isolate the power supply before accessing unit electri-
cal terminals.
Install unit so that unit disconnect is accessible.
Follow all local and national codes, as well as this
installation instruction, during installation. Do NOT
overload electrical circuit, as this may lead to failure
andpossiblere.
Usespeciedwiringandcabletomakeelectricalcon-
nections. Clamp cables securely and make sure that
connections are tight to avoid strain on wiring. Inse-
cure wiring connections may result in equipment fail-
ureandriskofre.Wiringmustbeinstalledsothatall
cover plates can be securely closed.
IntheU.S.A.,wiringmustconformwithcurrentlocalcodes
and the current National Electric Code (NEC). In Canada,
wiringmustconformwithcurrentlocalcodesandthecurrent
CanadianElectricalCode(CEC).
4.1. Overview
Refer to unit nameplate for minimum circuit ampacity and
maximumover-currentprotectionsize.
• Allindoorunitsarepoweredbytheoutdoorunit.
• Makeallelectricalpowerwiringconnectionsatthe
outdoor unit.
• Sizeoutdoorunitpowerperlocalcodeandpower
requirements.
• Connectwiringbetweenindoorandoutdoorterminals.
• Refertounitnameplateforratedvoltage.
• Besuretoreattachallelectricalboxcoversafter
connectionsarecomplete.
• FollowNEC/CECstandardsandalllocalandstate
codesduringwiringinstallation.
See“Table1.SingleZoneInstallationWiringRequirements”
and “Table 2. Specications” on page 10 for wiring
requirements.
4.2. Wire Gauge
Table 1. Single Zone Installation Wiring Requirements
Systems
and Terminal
Designations
System Capacity
System Voltage
Number of
Conductors
Wire Type
Wire Gauge / MCA
Indoor to
OutdoorWiring
(Communication/
Power)
1,2,3andGND
12K 115VAC 4
Strandedandshieldedorunshielded
16AWG
OutdoortoMain
Power
L,NandGND
12K 115VAC 3
14AWG /
15A
Indoor to Outdoor
Wiring
(Communication/
Power)
1,2,3andGND
09K 208/230VAC 4
16AWG /
10A
Indoor to Outdoor
Wiring
(Communication/
Power)
1,2,3andGND
12K 208/230VAC 4
16AWG /
11A
OutdoortoMain
Power
L1,L2andGND
09Kand
12K
208/230VAC 3
16AWG
/ 9A
Indoor to Outdoor
Wiring
(Communication/
Power)
1,2,3andGND
18Kand
24K
208/230VAC 4 16AWG
OutdoortoMain
Power
L1,L2andGND
18Kand
24K
208/230VAC 3
14AWG /
18A
MCA=MinimumCircuitAmps

Lennox MCA Series Specifications

General

Brand	Lennox
Model	MCA Series
Category	Air Conditioner
Language	English