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