11
5-572.10
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 electrically 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
located in the blower compartment. 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) may 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 hole 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.
UNIT INSTALLATION
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.
Electrical Connections
7. The wire gauge must be sized according to the National
Electric Code or CSA code based on amp draw and length
of run. Refer to Table 11.1 for maximum wire lengths that
can be wired between components and the terminal block
on the unit based on the wire gauge being used.
Minimum
Recommended
Wire Gauge
Maximum Distance (feet) from
Control Device to Unit
24V Control Wiring
Digital Control Wiring
22
n/a
120
20
n/a
200
18
75
300
16
125
500
14
175
n/a
Table 11.1 - 24V and Digital Control Wire Lengths
Test Probe
Points
Terminal
Numbers
Oval Holes
for Wiring
(two rows each)
Square Holes
for Wire Release
(two rows each)
Figure 11.1 - Terminal Strip Wiring (Model Digit 12=9)
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 11.1).
• 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).
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