DLSC-IOM-10.0
Installation - Electrical
Unit Wiring Diagrams
Specific unit wiring diagrams, based on unit options
ordered, are provided inside each unit and can be easily
removed for reference. Use these diagrams for
connections or trouble analysis. Wiring diagrams are
attached on the inside of the Control enclosure
Supply Power Wiring
Refer to the unit nameplate to obtain the minimum circuit
ampacity (MCA) and maximum fuse size (MFS) or
maximum circuit breaker (MCB) to properly size field
supply wiring and fuses or circuit breakers.
Refer to the unit operating voltage listed on the unit wiring
schematic, submittal, or nameplate. Reference the wiring
schematic for specific wiring connections.
Note:
All field wiring should conform to NEC and all
applicable state and local code requirements. The control
enclosure is always on the end opposite the piping
connections. Access the control box by removing the two
screws that secure the front cover. This will allow the panel
to be removed, to provide access to the electrical
components.
If the unit does not have a disconnect switch, the power
leads and ground terminal are situated inside the high
voltage compartment in the control enclosure. If the unit
has a disconnect switch, power connections are done
directly to the disconnect switch located in the control
enclosure.
Recommendation: Do not bundle or run interconnection
wiring in parallel with or in the same conduit with any high-
voltage wires (110 V or greater). Exposure of
interconnection wiring to high voltage wiring, inductive
loads, or RF transmitters may cause radio frequency
interference (RFI). In addition, improper separation may
cause electrical noise problems. Therefore, use shielded
wire (Belden 83559/83562 or equivalent) in applications
that require a high degree of noise immunity. Connect the
shield to the chassis ground and tape at the other end.
Note:
Do not connect any sensor or input circuit to an
external ground connection.
Table 4. Electrically commutated motors Full Load
Amps
Unit
Size
Motor
hp
277/1/60
FLA
240/1/60
FLA
208/1/60
FLA
120/1/60
FLA
1
1
/
3
2.6
2.8
3.3
5.0
2
1
/
3
2.6
2.8
3.3
5.0
3
1
/
2
4.1
4.3
5.0
7.7
5
3
/
4
5.5
6.8
7.9
9.6
All fan motors are single phase, same voltage as electric
coil (when supplied), with exception that 277 V motors are
used with 480V, 3 phase coils (4 wire wye).
FLA = Full Load Amperage, as tested in accordance with
UL 1995
Minimum Circuit Ampacity (MCA) and Maximum Fuse
Size (MFS) Calculations for Fan-Coils with Single
Phase Electric Heat
Heater amps = (heater kW x 1000)/heater voltage
MCA = 1.25 x (heater amps + all motor FLAs)
MFS type circuit breaker = (2.25 x largest motor FLA) +
second motor FLA + heater amps (if applicable)
Select a standard fuse size or circuit breaker equal to the
MCA. Use the next larger standard size if the MCA does
not equal a standard size.
Standard fuse sizes are: 15, 20, 25, 30, 35, 40, 45, 50, 60
amps.
DLSC Unit electric heat MBh = (heater kW)*(3.413)
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors may result in
equipment damage.
NOTICE
Equipment Damage!
Unit transformer provides power to the LSC unit only. Field
connections directly to the transformer may create
immediate or premature unit component failure.
NOTICE
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