28
If alternative airflows are desired, use board-mounted pots to ad
-
just the airflow associated with each input. Each output can be ad
-
justed from 0 to 100% of the motor’s factory programmed operat
-
ing range. Use voltmeter and airflow chart (on control box cover)
to set values. Refer to Appendix B on page 35 for adjustment pro
-
cedure on the legacy board. Refer to Appendix C on page 36 for
the 85 board and Appendix D for 4-Speed solid state field adjust
-
ment. See Fig. 39-41.
Fig. 39 — 3-Speed Potentiometer Adjustment
(Legacy)
Fig. 40 — 3-Speed Potentiometer Adjustment
(85 Board)
4-Discrete Speed Potentiometer Field Adjustment, Solid State
The unit has been factory configured to produce PSC equivalent
airflow on high speed, with medium and low speed set at 80% and
60% of high, respectively. If these settings are acceptable, then no
further configuring is required.
Board mounted pots are provided to adjust the airflow pertaining
to each output. Each output can be adjusted from 0 to 100% of the
motor’s factory programmed operating range. Use voltmeter and
airflow chart (on the control box cover) to set values. Refer to
Appendix D on page 41 for adjustment procedure. See Fig. 41.
Variable Airflow for 0-10 vdc Input
If a factory provided thermostat or DDC controller is utilized, then
the unit is already correctly configured. Carrier recommends using
the specified thermostat or DDC controller to commission the unit
whenever possible. However, the blower can be started and oper
-
ated without the thermostat. Consult factory for further instruction.
ECM Variable Airflow for 0-10 vdc
No control board is required and no field adjustments are possible.
Motor uses 0-10 vdc signal directly. See control box label. Fan en
-
able at 1.5 vdc.
Fig. 41 — 4-Speed Potentiometer Field Adjustment
(Solid State)
START-UP
Before beginning any start-up operation, the start-up personnel
should familiarize themselves with the unit, options and accesso
-
ries, and control sequence to understand the proper system opera
-
tion. All personnel should have a good working knowledge of
general start-up procedures and have the appropriate start-up and
balancing guides available for consultation.
The building must be completely finished including doors, win
-
dows, and insulation. All internal walls and doors should be in
place and in the normal position. In some cases the interior deco
-
rations and furniture may influence overall system performance.
The entire building should be as complete as possible before be
-
ginning any system balancing.
The initial step in any start-up operation should be a final visual
inspection. All equipment, plenums, ductwork, and piping should
be inspected to verify that all systems are complete and properly
installed and mounted, and that no debris or foreign articles such
as paper or drink cans are left in the units or other areas.
Each unit should be checked for loose wires, free blower wheel
operation, and loose or missing access panels or doors. Except as
required during start-up and balancing operations, no fan coil units
should be operated without all the proper ductwork attached, sup
-
ply and return grilles in place, and all access doors and panels in
place and secure. A clean filter of the proper size and type must
also be installed. Failure to do so could result in damage to the
equipment or building and furnishings and/or void all manufac
-
ture’s warranties.
Maximum operating altitude for units is 13,400 ft (4 km). All units
are IPX0 rated.
L2
LOW
MED
HIGH
VR1
VR2
VR3
K1
K2
K3
LOW
MED
HIGH
COM
C1
C2
C3
CR1
L1
POTS
Potentiometers
CAUTION
Both of the start-up and servicing procedures described below
require the control box to be powered while adjustments are
made. Line voltage components are concealed behind a sec
-
ondary cover. However, installer should still take all reason
-
able precautions.
Flo 1, 2, and 3
Terminals
Flo 0 and 4 Terminals
Com
Pot Adjustment
Flo 1, 2, and 3
(in the field)
Pot Adjustment
Flo 0 and 4
(Contact Factory)