8
FORM 145.13-NO2
ISSUE DATE: 1/22/2020
SECTION 1 - INSTALLATION
DSH MODELS
The VFD controller on DSH units is factory wired. The
evaporator fan power conductors are factory wired to
the distribution block. The control wiring for field split
applications needs to be field provided and routed from
condenser to evaporator.
VAV UNITS
Differential Pressure Transducer
FOR TECHNICAL SUPPORT, CALL: 877-329-7430
STK-VFD
VFD FACTORY PROGRAMMED
PARAMETERS ARE SET IN THE SE CONTROLLER
AJAX, CANADA
VFD PART #:
VFD APPLICATION:
DATE PROGRAMMED:
VFD-SEC-XXXHE-X
05/10/16
DRIVE FACTORY PROGRAMMED
VAV w/ PRESSURE TRANSDUCER
LD20871
FIGURE 1 -
LABEL ON UNIT/VFD FOR VAV WITH
PRESSURE TRANSDUCER
For VAV option units, the differential pressure trans-
ducer is factory wired and 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 0–5VDC output for DSV/
DSH C-gen units.
The transducer is supplied with two 1/4-inch OD pres-
sure fittings and accepts field provided 1/4-inch push-
on tubing for lengths of up to 300 feet. The positive
(HIGH) and negative (LOW) pressure ports are indi-
cated 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
• 4009 and 4011 are parameters within the
ABB VFD drive and are factory set at
0.5 ”WC. These field adjusted points are adjusted
at start-up. These setpoints are based on system
requirements.
Example:
If the Supply Duct Static Pressure is
designed for 1.0 "WC, set both Parameters 4009
and 4011 to 1. Adjust Parameters 4009 and 4011
up or down accordingly until the required setpoint
is achieved. Once the setpoint is adjusted, docu-
ment Parameters 4009 and 4011 for future refer-
ence.
Do not adjust the VFD setpoint to greater
than the maximum design pressures of the
duct system or the unit.
• Only use 24VAC from SE controller to the differ-
ential pressure transducer (Term. Exc.)
• Set S1 jumper on VFD, AI1, to Volts
• The VFD is enabled by the Evaporator Fan VFD
Relay (RVFD)
