IM 962-2 15
Installation
Table 10: Field Wire Size for 24 Volt Thermostat
Thermostat Load
Amps
Solid Copper Wire –AWG
3.0 16 12 10 10 10
2.5 16 12 12 10 10
2.0 18 14 12 12 10
Length of Run, ft
(1)
50 150 200 250 300
(1) Wire length equals twice the run distance.
Grounding
A grounding lug is provided in control box for a ground wire.
Grounding also may be accomplished by grounding the power
line conduit to the unit.
WARNING
This unit must be permanently grounded. A ground lug is
provided near the contactor for a ground wire. Failure to do
so can cause a re or electrical shock resulting in property
damage, severe personal injury or death.
Thermostat
An appropriate thermostat should be mounted on an inside
wall in a location where it will not be affected by the sun
or drafts, from open doors or other sources. Install, level,
and after installation check the thermostat calibration and
recalibrate if necessary. Refer to thermostat manufacturer’s
information for additional installation, checkout and operation
instructions.
Table 11: Copper Wire Size (1% Voltage Drop)
Circuit
Ampacity
Copper Wire Gauge (75°C Insulation)
Distance In Feet
100 150 200 250 300
40 6 4 3 2 1
45 4 3 2 1 1/0
50 4 3 2 1 1/0
60 4 2 1 1/0 2/0
70 3 2 1/0 2/0 3/0
80 3 1 1/0 2/0 3/0
90 2 1/0 2/0 3/0 4/0
100 2 1/0 2/0 3/0 4/0
110 1 2/0 3/0 4/0 250
125 1 2/0 3/0 4/0 250
Figure 16: Typical Field Wiring Connections
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