Trane VariTrane VAV Series Installation & Operator's Manual page 48

Figure 20 – Single-Duct Units (Pneumatic Controls)
SINGLE DUCT UNITS - PNEUMATIC CONTROL -
HEATER TERMINAL - TYPICAL OF SINGLE PHASE VOLTAGES
SINGLE
PHASE
LINE
VOLTAGES
STAGES
208
240
277
347
480
HEATER
CONTACTORS
P.E. with Magnetic Contactors (PEMA)
P.E. with Mercury Contactors (PEME)
SINGLE DUCT UNITS - PNEUMATIC CONTROL -
HEATER TERMINAL - TYPICAL OF THREE PHASE VOLTAGES
THREE
PHASE
STAGES
LINE
VOLTAGES
208
480
575
HEATER
CONTACTORS
P.E. with Magnetic Contactors (PEMA)
P.E. with Mercury Contactors (PEME)
NOTE:
FACTORY INSTALLED
1.
FIELD INSTALLED
OPTIONAL
2. Actual heater wiring diagram is 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 provided as standard.
Heater Line Fuses and Door Interlocking
5.
Disconnect are optional.
48
Wiring
Diagrams
1
2
3
1
2
3
Contactors
PE Switch
1st Stage
Thermal Cutout
P.E. Switch
2nd Stage
P.E. Switch
3rd Stage
Contactors
PE Switch
1st Stage
Thermal Cutout
P.E. Switch
2nd Stage
P.E. Switch
3rd Stage
Line Voltage
L1 L2 N - 480
(See Nameplate)
TB4
Manual Reset
Optional
Cutout
Fuse
Auto Reset Air Flow
Switch
L1 N
Optional
Door
Disconnect
Switch
L1 L2 L3 - 208, 600
Line Voltage
L1 L2 L3 N - 480
(See Nameplate)
L1
Manual Reset Optional
Cutout
Fuse
L1 L2 L3
Air Flow
Auto Reset
Switch
L1 L2 L3
Optional
Door
Disconnect
Switch
L1 L2 - 208, 240
L1 N - 277, 347
L1 N
G
L1 N
G
L2 L3
G
TB4
N
G
N
VAV-SVN01E-EN