Electrical Supply Wire And Mop; Building Electrical Service Inspection; Wire Sizing; Maximum Overcurrent Protection (Mop) - Whirlpool WAHMS Installation Instructions Manual

WARNING
Goodman 22
To avoid the risk of fire or equipment damage, use
copper conductors.
WARNING
HIGH VOLTAGE!
Disconnect ALL power before servicing.
Multiple power sources may be present.
Failure to do so may cause property damage,
personal injury or death.
WARNING
To avoid property damage, personal injury or death due to
electrical shock, this unit MUST have an uninterrupted,
unbroken 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.

Building Electrical Service Inspection

This unit is designed for single-phase electrical supply.
NOTE: Do not operate on a 3-phase power supply.
Measure the power supply to the unit. The supply voltage must
be in agreement with the unit nameplate power requirements and
within the range shown in the following table.
Nominal Input Minimum Voltage Maximum Voltage
208/240 187

Wire Sizing

Wire size is important to the operation of your equipment. Use
the following check list when selecting the appropriate wire size
for your unit.
Wire size must carry the Minimum Circuit Ampacity (MCA).
Refer to the NEC (USA) or CSA (Canada) for wire sizing. The
unit MCA for the air handler and the optional electric heat kit
can be found on the unit Series and Rating Plate.
Wire size allows for no more than a 2% voltage drop from the
building breaker/fuse panel to the unit.
Refer to the latest edition of the National Electric Code, or in
Canada, the Canadian Electric Code when determining the
correct wire size. The following table shows the current
carrying capabilities for copper conductors rated at 75ºC with
a 2% voltage drop. Use the following table to determine the
voltage drop per foot of various conductors.

ELECTRICAL SUPPLY WIRE AND MOP

Goodman 6
Goodman 34
253
Maximum Allowable Length in Feet to
Limit Voltage Drop to 2%*
Wire Minimum Circuit Ampacity (MCA)
Size
10 15 20
(AWG)
14 75 50 37
12 118 79 59
10 188 125 95
8 301 201 150
6 471 314 235
*Based on NEC 1996.

Maximum Overcurrent Protection (MOP)

Every installation must include an NEC (USA) or CEC (Canada)
approved overcurrent protection device. Also, check with local or
state codes for any special regional requirements.
Protection can be in the form of fusing or HACR-style circuit
breakers. The Series and Rating Plate can be used as a guide for
selecting the MAXIMUM overcurrent device.
NOTE: Fuses or circuit breakers are to be sized larger than the
equipment MCA but not to exceed the MOP.
Electrical Connections—Supply Voltage
IMPORTANT: Use copper conductors only.
A knockout is provided on the air handler top panel or side to
allow for the entry of the supply voltage conductors. If the
knockouts on the cabinet sides are used for electrical conduit, an
adapter ring must be used in order to meet UL1995 safety
requirements. An NEC or CEC approved strain relief is to be used
at this entry point. The wire is to be sized in accordance with the
"Electrical Wire and MOP" section of this manual. Some areas
require the supply wire to be enclosed in conduit. Consult your
local codes.
Air Handler Only—Nonheat Kit Models
The building supply connects to the stripped black and red wires
contained in the air handler electrical compartment cavity. A
ground screw is also contained in this area. Attach the supply
wires to the air handler conductors as shown in the unit wiring
diagram using appropriately sized solderless connectors or other
NEC or CEC approved means.

Air Handler With Noncircuit Breaker Heat Kits

A terminal block is provided with the HKR kit to attach the power
supply and air handler connections. Follow the HKR Installation
Manual and wiring diagram for complete wiring details.
Air Handler With Heat Kits Containing
a Circuit Breaker
HKR models with a "C" suffix contain a circuit breaker(s). The air
handler has a plastic cover on the access panel that will require
either one or both sections to be removed to allow the heat kit
circuit breaker(s) to be installed. See the HKR Installation
Instructions for further details. The air handler wires and supply
wires are installed directly onto the HKR circuit breaker(s) as
shown in the HKR Installation Manual and wiring diagram.
25 30 35 40
NR NR NR NR
47 NR NR NR
75 63 54 NR
120 100 86 75
188 157 134 118
45
NR
NR
NR
68
110
5