Install Instructions

12
12.2 Wire Sizing
Wire size is import ant to the operation of your equipment.
Use the follow ing check list when selecting the appropriat e
wire size for your unit .
• W ire used must carry the M inimum Circuit Ampacity
(M CA) listed on the unit’s Series and Rating Plate.
• Refer to the NEC (USA) or CSA (Canada) for wire sizing. The
unit M CA for the air handler and the optional electric heat
kit can be found on the unit Series and Rat ing Plate.
• W ire must be sized to allow no more than a 2% voltage
drop from the building breaker/ fuse panel to the unit.
• Wires wit h different insulat ion temperat ure rat ing have
varying ampacities - be sure to check the temperat ure rat-
ing used.
Refer to the lat est edit ion of the National Electric Code or
in Canada the Canadian Electric Code when det ermining
the correct wire size.
12.3 M aximum Overcurrent Protection (M OP)
Every inst allat ion must include an NEC (USA) or CEC
(Canada) approved overcurrent prot ection device. Also,
check wit h local or state codes for any special regional re-
quirements.
Prot ection can be in the form of fusing or HACR st yle cir-
cuit breakers. The Series and Rat ing Plat e provides t he
maximum overcurrent device permissible.
NOTE: Fuses or circuit breakers are to be sized larger than
the equipment M CA but not to exceed the M OP.
12.4 Electrical Connections – Supply Voltage
IM PORTANT NOTE: USE COPPER CONDUCTORS ONLY.
Knockouts are provided on t he air handler top panel and sides of the cabi-
net to allow for the entry of the supply voltage conductors, as show n in
Figure 13. If the knockout s on the cabinet sides are used for elect rical con-
duit , an adapter ring must be used in order to meet UL1995 safety require-
ments. An NEC or CEC approved strain relief is to be used at this entry
point . Some codes/ municipalities require the supply wire to be enclosed in
conduit . Consult your local codes.
12.4.1 Air Handler Only (Non-Heat Kit M odels)
The building supply connects to the stripped black and red wires contained
in the air handler electrical compartment cavity. A ground screw is also con-
tained in t his area. Attach the Supply wires to the air handler conductors as shown in the unit wiring diagram using appropri-
ately sized solderless connectors or ot her NEC or CEC approved means.
12.4.2 Air Handler - Non-Circuit Breaker Heat Kits
A terminal block is provided with the HKS kit to att ach the power supply and air handler connections. Follow the HKS Installation
M anual and wiring diagram for complet e wiring details.
12.4.3 Air Handler W ith Circuit Breaker Heat Kit
The air handler has a plastic cover on the upper access panel that will require eit her one or both sections to be removed to allow
the heat kit circuit breaker(s) to be inst alled. The circuit breakers have lugs for power supply connection. See the HKS Inst alla-
tion Inst ructions for furt her det ails.
FIRE HAZARD!
To avoid the risk of property damage, personal injury
or fire, use only copper conductors.
HIGH VOLTAGE!
Failure to do so may cause property damage,
personal injury or death.
Disconnect ALL power before servicing.
Multiple power sources may be present.
HIGH VOLTAGE!
To avoid property damage, personal injury or death
due to electrical shock, this unit MUST have an
electrical ground. The
electrical ground circuit may consist of an
appropriately sized electrical wire connecting the
ground lug in the unit control box to the building
electrical service panel.
Other methods of grounding are permitted if performed
in accordance with the National Electric Code
(NEC)/American National Standards Institute
(ANSI)/National Fire Protection Association (NFPA) 70
and local/state codes. In Canada, electrical grounding
is to be in accordance with the Canadian Electric Code
(CSA) C22.1.
uninterrupted, unbroken
Side of
Cabinet
Top of
Cabinet
KNOCK-OUT FOR ELECTRICAL CONNECTIONS
Figure 13