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Installation
Electric Heat Units (SEH_)
Proper Field Wiring and Grounding Required!
All field wiring MUST be performed by qualified personnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST
follow requirements for field wiring installation and grounding as described in NEC and your
local/state electrical codes. Failure to follow code could result in death or serious injury.
SEHL (20 through 89 Ton) electric heat units operating on 200/230 volts require two power supplies
as illustrated in
fused disconnect switches, two field-supplied disconnect switches must be installed. The power
wires for the electric heat is routed into the electric heat control panel using the thru-the-base
access provided in the heating section. Refer to the appropriate illustration in
Base layout and Electrical Entrance diagram), for dimensional data.
On 20-130 ton units operating on 460/575 volts, only one power entry is required, as illustrated in
Figure
Use the information provided in
Equations" , to determine the appropriate wire size and Maximum Over current Protection for the
heaters/unit.
Note: Each power supply must be protected from short circuit and ground fault conditions. To
Provide grounding for the supply power circuit in the electric heat control box.
Main Unit Power Wiring
Proper Field Wiring and Grounding Required!
All field wiring MUST be performed by qualified personnel. Improperly installed and grounded
field wiring poses FIRE and ELECTROCUTION hazards. To avoid these hazards, you MUST
follow requirements for field wiring installation and grounding as described in NEC and your
local/state electrical codes. Failure to follow code could result in death or serious injury.
Figure 37, p. 84
and the optional main power disconnect switch 1S14.
data for 20 through 130 ton units. The electrical service must be protected from over current and
short circuit conditions in accordance with NEC requirements. Protection devices must be sized
according to the electrical data on the nameplate. Refer to the "Power Wire Sizing & Protection
Device Equations" , for determining;
1. If the unit is not equipped with an optional factory installed non-fused disconnect switch, a field
2. Location for the electrical service entrance is illustrated in
68
Figure
34. Unless the unit was ordered with the optional factory mounted non-
34.
comply with NEC, protection devices must be sized according to the "Maximum Over
current Protection" (MOP) or "Recommended Dual Element" (RDE) fuse size data on the
unit nameplate.
lists the field connection wire ranges for both the main power terminal block 1TB1
a. the appropriate electrical service wire size based on "Minimum Circuit Ampacity" (MCA),
b. the "Maximum Over current Protection" (MOP) device,
c. the "Recommended Dual Element fuse size" (RDE).
supplied disconnect switch must be installed at or near the unit in accordance with the National
Electrical Code (NEC latest edition). Refer to the "Power Wire Sizing & Protection Device
Equations" (DSS calculation), for determining the correct size.
power wiring connections onto either the main terminal block 1TB1, or the factory mounted
WARNING
Table 21, p. 71
and the "Power Wire Sizing & Protection Device
WARNING
Table 21, p. 71
Figure 10, p.
lists the component electrical
Figure 10, p.
36. Complete the unit's
RT-SVX36G-EN
36, (Unit
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