JOHNSON CONTROLS
8
FORM 145.13-NO1
ISSUE DATE: 10/06/2016
SECTION 1 - INSTALLATION
CSV MODELS
CSV units that are 10–20 tons are factory wired; no
field wiring is required. The 25-ton CSV unit ships
split, and field wiring of evaporator fan motor con-
ductors to terminal block in electrical box is required.
Connect low voltage wiring from VFD unit (10VDC)
to the evaporator fan VFD relay RVFD (red wire to
“C”; yellow wire to “NO”). The RVFD relay acts as
a switch to turn on the VFD. The VFD switch runs on
10VDC. See
VFD Option Schematics on page 14
.
Do not cross 24VAC and 10VDC wiring.
VAV UNITS
Differential Pressure Transducer
FOR TECHNICAL SUPPORT, CALL: 877-329-7430
STK-VFD
VFD FACTORY PROGRAMMED
SET PARAMETER 4009 & 4011 PRIOR TO START-UP
JOHNSON CONTROLS, AJAX, CANADA
VFD PART #:
VFD APPLICATION:
DATE PROGRAMMED:
VFD-PTD-236HE-2
05/10/16
DRIVE FACTORY PROGRAMMED
VAV w/ PRESSURE TRANSDUCER
LD20871
FIGURE 1 -
WARNING LABEL ON UNIT/VFD FOR
VAV WITH PRESSURE TRANSDUCER
Units with a VAV option have a factory-wired differ-
ential pressure transducer mounted inside the VFD
control box. The transducer senses gage pressure (stat-
ic) and converts this pressure difference to an analog
signal. The unit is wired for 4-20mA output from the
transducer.
Transducer comes with two 1/4-inch OD pressure fit-
tings and accepts field provided 1/4-inch push-on tub-
ing for lengths of up to 300 feet. The positive (HIGH)
and negative (LOW) pressure ports are indicated on
the transducer. Connect unit RETURN AIR tubing to
negative (LOW) fitting and SUPPLY AIR tubing to
positive (HIGH) fitting.
•
Only on 208/230-460 VAC units; not on 575 VAC
•
Parameters 4009 and 4011 are factory set at
0.5 ”WC. These are field adjusted points that need
to be adjusted at start-up. These setpoints are
based upon system requirements.
Example:
If the Supply Duct Static Pressure was
designed for 1.0 "WC, both Parameters 4009 and
4011 need set to 1. Adjust Parameters 4009 and
4011 up or down accordingly until the required
setpoint is achieved. Once the setpoint is adjusted,
please document Parameters 4009 and 4011 for
future reference.
The VFD setpoint should never be ad-
justed to be greater than the duct system's
or unit's maximum design pressures.
•
The differential pressure transducer will provide a
signal to the VFD, and the VFD will control to the
setpoint parameters 4009 and 4011
•
Only use the 24VDC from the VFD (Term. 9) to
the differential pressure transducer (Term. Exc.)
•
Term. 2 from the VFD will be wired to the differ-
ential pressure transducer (Term. COM)
•
The Term. OUT on the differential pressure trans-
ducer is not wired
•
The jumper on the VFD, AI1, needs to be set to
4-20Ma
•
The VFD is enabled by the Evaporator Fan VFD
Relay (RVFD)
•
If the VAV option is not selected, the unit will
have Discrete 2 Speed Fan Control by default for
all units 10 tons or larger
DISCRETE 2 SPEED FAN CONTROL
FOR TECHNICAL SUPPORT, CALL: 877-329-7430
STK-VFD
VFD FACTORY PROGRAMMED
NO FIELD PROGRAMMING REQUIRED
JOHNSON CONTROLS, AJAX, CANADA
VFD PART #:
VFD APPLICATION:
DATE PROGRAMMED:
VFD-2DS-236HE-2
05/10/16
DRIVE FACTORY PROGRAMMED
2 DISCRETE SPEED
LD20872
FIGURE 2 -
WARNING LABEL ON UNIT/VFD FOR
DISCRETE 2 SPEED FAN CONTROL
The Discrete 2 Speed Fan Control is available on all
DSV and CSV units 10 tons or larger. For DSH units, it
is only available on the 10-ton units.
