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VAV-SVN01E-EN 47
Wiring
Diagrams
Figure 19 – Single-Duct Units (Electronic or DDC/UCM)
1.
3. Load carrying P.E. Switches or Contactors
are supplied depending upon amp drawn.
and Manual Reset Cutout are provided as standard.
4. Air Flow Switch, Auto Reset Thermal Cutout
5. Heater Line Fuses, Transformers, and Door
SINGLE DUCT UNITS - ELECTRONIC OR DDC/UCM -
HEATER TERMINALS - TYPICAL OF SINGLE PHASE VOLTAGES
HEATER TERMINALS - TYPICAL OF THREE PHASE VOLTAGES
SINGLE DUCT UNITS - ELECTRONIC OR DDC/UCM -
BLU
YEL
BRN
ORG
PUR
RED
L1
(See Nameplate)
Line Voltage
L1
TB4
G
N
N
G
L1
N
Disconnect
Switch
Door
Optional
Cutout
Manual Reset
Contactor
1st Stage
Switch
Air Flow
Thermal Cutout
Auto Reset
Optional
Transformer
24V Input from
Controller
Controller
24V Output to
BRN
ORG
BLU
YEL
RED
PUR
Manual Reset
Cutout
Air Flow
Switch
Auto Reset
Thermal Cutout
Switch
Optional
Disconnect
Door
Controller
24V Output to
Controller
24V Input from
L1 L2 L3
G
L1 L2 L3
L2L1 L3
G
Optional
Transformer
6. If transformer is not ordered, a separate 24-volt
power supply is required for operation of unit controls.
with each unit (3-stage shown).
2. Actual heater wiring diagrams are supplied
FIELD INSTALLED
OPTIONAL
FACTORY INSTALLED
Optional
Fuse
2nd Stage
Contactor
3rd Stage
Contactor
(See Nameplate)
Line Voltage
Fuse
Optional
208
480
575
VOLTAGES
LINE
2
240
Mercury Contactors (MERC)
Magnetic Contactors (MAGN)
277
HEATER
CONTACTORS
3
STAGES
VOLTAGES
208
LINE
1
347
480
Mercury Contactors (MERC)
Magnetic Contactors (MAGN)
CONTACTORS
HEATER
STAGES
1
2
3
Notes:
THREE
PHASE
Interlocking Disconnect are optional.
Contactor
2nd Stage
3rd Stage
Contactor
1st Stage
Contactor
TB4
PHASE
SINGLE
Optional
Fuse
(208, 240, and 480)
L1 L2 L3 - 208,480,600
L1 N - 277, 347
L1 L2 - 208, 240
L1 L2 N - 480