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INSTALLATION - ELECTRICAL CONNECTIONS
Electrical Connections
WARNING
1. Disconnect power supply before making wiring connections
or working on this equipment. Follow all applicable safety
procedures to prevent accidental power up. Failure to
do so can result in injury or death from electrical shock or
moving parts and may cause equipment damage.
2. All appliances must be wired strictly in accordance with
wiring diagram furnished with the appliance. Any wiring
different from the wiring diagram could result in a hazard to
persons and property.
3. Any original factory wiring that requires replacement must
be replaced with wiring material having a temperature
rating of at least 105°C.
4. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% greater than rated
voltage.
CAUTION
1. Ensure that the supply voltage to the appliance, as
indicated on the serial plate, is not 5% less than the rated
voltage.
2. Do not reuse any mechanical or electrical component
which has been wet. Such components must be replaced.
1.
Installation of wiring must conform with local building codes,
or in the absence of local codes, with the National Electric
Code ANSI/NFPA 70 - Latest Edition. Unit must be
electri cally grounded in conformance to this code. In
Canada, wiring must comply with CSA C22.1, Part 1,
Electrical Code.
2.
Two copies of the job specific wiring diagram are provided
with each unit, one located in the duct furnace electrical
junction box and one in the electrical section of the unit.
Refer to this diagram for all wiring connections.
3.
External electrical connections to be installed include:
•
Supply power (120, 208, 240, 480, or 600 volts).
•
Thermostats, remote monitoring panels, building
pressure sensors, time clocks, or any other accessory
control devices that may be supplied (24 volts).
4.
All supply power electrical connections are made in the
electrical section of the unit. The low voltage (thermostat
and accessory control devices) can be wired to either the
electrical section or the duct furnace electrical junction box.
Refer to the wiring diagram for the terminal location of all
low voltage wiring.
5.
Refer to the unit dimensional drawings in this document
for the location of the drill locator dimples in the side and
bottom of the unit for field drilling the hold for the electrical
conduit entry.
6.
Control wiring consists of both 24V analog control wiring and
for models with Model Digit 12=9, low current digital control
signal wiring. To avoid signal interference, the two types
should be run in conduit separate from power wiring. The
analog control wiring should be shielded at one end of the
wiring run. Wiring should be stranded, twisted, and shielded
communication wire.
7.
The wire gauge must be sized according to the National
Electric Code or CSA code based on the power supply
voltage, amp draw, and length of run. Refer to the Table 15.1
for maximum wire lengths.
Table 15.1 - 24V and Digital Control Wire Lengths
Minimum
Recommended
Wire Gauge
22
20
18
16
14
8.
FOR UNITS WITH MODEL DIGIT 12=9 (MODINE
CONTROL SYSTEM OPTION): For field wiring to the
factory terminal strip, the terminal strip connections are
designed to clamp down on the wires. To properly connect
the wires to the terminal strip:
• Push a small flat-head screwdriver into the square hole on
the terminal. Press firmly until the screwdriver hits the
back stop and opens the terminal (see Figure 15.1).
• Remove approximately 3/8" of insulation from the end of
the wire and push the stripped wire into the oval hole in
the terminal.
• Remove the screwdriver. Pull on the wire to make sure
that it is securely clamped in the terminal.
• Make sure that the terminal clamp is in contact with bare
wire (insulation removed).
Figure 15.1 - Terminal Strip Wiring (Model Digit 12=9)
Oval Holes
for Wiring
(two rows each)
Square Holes
for Wire Release
(two rows each)
Terminal
Numbers
Test Probe
Points
(continued next page)
5-594.10
Maximum Distance (feet) from
Control Device to Unit
24V Control Wiring
Digital Control Wiring
n/a
n/a
75
125
175
120
200
300
500
n/a
15
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