JOHNSON CONTROLS
9
SECTION 1 - INSTALLATION
FORM 145.13-NO1
ISSUE DATE: 10/06/2016
1
Supply Fan VFD Sequence for 208/230-460 VAC units
(Discrete 2 Speed Fan Control):
Speed 1
•
Supply fan only
OR
•
Supply fan and compressor #1 running
•
Factory set at 35 Hz (do not set lower than 35 Hz)
•
Set at parameter 1202
•
24 VDC applied to terminal 12 of VFD
Speed 2
•
Supply fan and compressors #1 and #2 are running
•
Factory set at 60hz
•
Set at parameter 1204
•
24 VDC applied to terminal 12 and 13 of VFD
Supply Fan VFD Sequence for 575 VAC units (only
Discrete 2 Speed Fan Control is used):
Speed 1
•
Supply fan only
OR
•
Supply fan and compressor #1 running
•
Factory set at 35 Hz (do not set lower than 35 Hz)
•
Set at parameter 1202
•
24 VDC applied to terminal 4 of VFD
Speed 2
•
Supply fan and compressors #1 and #2 are running
•
Factory set at 60hz
•
Set at parameter 1204
•
24 VDC applied to terminal 4 and 6 of VFD
VFD KEYPAD
VFD requires a keypad to program the VFD. Once the
VFD is programmed, the keypad is not required in or-
der to operate the unit. Each unit comes with factory
installed and programmed remote keypad and short
Ethernet clip-on connector. An Ethernet communica-
tion cable is not factory supplied. A single keypad can
be used to program multiple units. If needed, consult
with local Johnson Controls sales office to order ad-
ditional keypads.
LD20860
FIGURE 3 -
VFD KEYPAD
LD20861 LD20862
FIGURE 4 -
VFD KEYPAD AND ETHERNET
CONNECTOR
INSTALLATION
Install a field supplied 1/4-inch push-on tube to the
return air side of the unit. Pass the tube through the
opening on the side of the corner post adjacent to the
VFD controls, and connect to the negative (LOW) side
fitting.
Install a field supplied Pitot tube in the supply duct as
required, run 1/4-inch push-on tube to the corner post
opening, and connect to the positive (HIGH) side fit-
ting.
