E3 UNDERFLOOR PRODUCTS
KBF | Booster Fan Unit
KBF Control Information
EQUENCE OF OPERATION
S
The standard KBF sequence of operations has the fan operating
when the space is calling for cooling or heating, providing a
constant volume of induced plenum air to the space. When the
ECM motor option is included, the unit controls can vary the fan
speed, and resultant airflow rate to the space.
COOLING MODE
When the space is hot and cooling demand is at maximum, the
fan operates continuously. As the cooling demand is satisfied,
the unit may cycle off. If the ECM motor option is installed, the
controller can vary the airflow rate in response to the level of
cooling demand.
EATING MODE
H
When the space is cold and heating demand is at maximum,
electric or water heat, if supplied, are set to maximum. As
heating demand is satisfied, electric or water heat, if supplied,
is cycled off, or modulated to a reduced setting. As the heating
demand is satisfied, the unit may cycle off. If ECM motor option
is installed, the controller can vary the airflow rate in response
to the level of heating demand.
ONTROL OPTIONS
C
• Direct Digital Controls*: Control packages are field
supplied for factory mounting, piping and wiring. All control
arrangements include a control enclosure, SCR fan speed
controller, transformer to 24 volts, and fan relay
• No Controls: Units are factory supplied without controls,
assuming that the unit is being used for field mounting of
direct digital control equipment. This arrangement includes
a control enclosure, SCR fan speed controller, transformer
to 24 volts, and fan relay.
UNDERFLOOR PRODUCTS
* Contact your local Krueger representative for a complete list of direct digital control arrangements.
KBF Suggested Specification & Configuration
KBF UNIT
Furnish and install Krueger model KBF fan powered terminal
units of the sizes and capacities shown on the plans. Unit size
limitations shall be as follows to ensure that all terminal units
will fit the available space. The terminal, including all control
enclosures, shall be designed to fit in the plenum space below
a raised floor. The unit shall fit within a 24” x 24” pedestal grid
system without modifications to the grid.
Terminal units should be tested by use of AHRI Standard 880.
The terminal shall be designed, built, and tested as a single
unit including motor and fan assembly, water or electric heating
coils, and accessories as shipped. Unit shall ship as a complete
assembly requiring no field assembly (including accessories).
All electrical components shall be UL listed and installed in
accordance with UL Standard 1995. Electrical connection shall
be single point. All electrical components, including low voltage
controls, shall be mounted in sheet metal control enclosures.
The entire terminal shall be ETL listed as a complete assembly.
The terminal casing shall be minimum 20 gage galvanized
steel. The terminal shall have top access to high and low
voltage controls and components and allow removal of fan and
servicing of terminal without disturbing duct connections.
K
B The terminal units shall utilize a manual SCR or a remote
F signal, which allows continuously adjustable fan speed from
E3-44
Unit labels shall be adhered to each unit including model, size,
airflow (CFM), electrical information, and tagging data.
The radiated and discharge attenuation factors for the
specified NC levels shall be based on attenuation factors from
AHRI Standard 885-08, Appendix E modified for underfloor
applications.
ELECTRIC HEATING COILS
Electric coils shall be supplied by the terminal unit manufacturer
and shall be ETL listed in accordance with UL standards.
Construct coil casing with minimum of 20 gage galvanized
steel. Elements shall be 80/20 Ni-Cr and supported by ceramic
insulators. The integral control panel shall be housed in a NEMA
2 enclosure with hinged access door for access to all controls
and safety devices.
Electric coils shall contain a primary automatic reset thermal
cutout and differential pressure airflow switch for proving of
airflow.
• (Optional) Electric coils shall include fused or non-fused
door interlocking disconnect switch, AC solid state relay
contactors, fuse block, manual reset cutout, and/or dust tight
enclosure construction.
www.krueger-hvac.com | Excellence in Air Distribution
© KRUEGER 2012
Fan shall be of the forward curve, centrifugal type. The fan
motor shall be [120, 208/240, or 277 Volt, Single-Speed,
Single-Phase, 60-Cycle], energy efficient design, permanently
lubricated, using permanent split capacitor for starting and be
specifically designed for use with an SCR fan speed controller.
Motor must have thermal overload protection. The fan motor
shaft shall be connected directly to the fan, and fan motor shall
be isolated from the unit casing to prevent transmission of
vibration.
maximum to minimum, as a means of setting fan airflow. Setting
fan airflow with any device that raises the pressure across the
fan to reduce airflow is not acceptable. The speed control shall
incorporate a minimum voltage stop to ensure that the motor
cannot operate in a stall mode.
• (Optional) ECM Fan Motor: The fan motor shall be [120,
208/240, or 277 Volt, Single-Phase] ECM (electronically
commutated motor) fan motor including either a VCU or ACU
speed controller. The VCU fan speed control can be manually
set at the Krueger factory and/or is manually field set and is
field adjustable with digital display, alternating between RPM
and percentage full airflow. The ACU control shall provide a
means to remotely set and/or adjust the fan speed.
UNDERFLOOR PRODUCTS E3
KBF | Booster Fan Unit
KBF Suggested Specification & Configuration
• (Optional) LineaHeat solid state electronic proportional
control of electric heat shall meet the requirements of
ASHRAE Standard 62, Addenda N.
• (Optional) LineaHeat solid state electronic controlled heater
with control of the leaving air temperature limiting the unit
discharge temperature to a set value.
HOT WATER COILS
Hot water coil casing shall be constructed with minimum 20
gage galvanized steel with flanged discharge for attachment to
downstream duct work. Coils shall be factory installed on the
terminal unit. Fins shall be rippled and corrugated heavy gage
1. SERIES: (XXX)
KBF - Underfloor Booster Fan Terminal Unit
2. LINER TYPE: (X)
0 - No Liner
4. UNIT SIZE: (XX)
10 -10” Terminal Unit Height
14 -14” Terminal Unit Height
16 -16” Terminal Unit Height
5.INLET PANEL (X)
N - Non-Ducted Inlet Panel
D - Ducted Inlet Panel
6.MOTOR VOLTAGE: (X)
1 - 120V, Single-Phase
2 - 208/240V, Single-Phase
3 - 277V, Single-Phase
4 - ECM Motor, 120V, Single-Phase*
5 - ECM Motor, 208/240V, Single-Phase*
6 -ECM Motor, 277V, Single-Phase*
7. CONTROL TYPE: (X)
0 - None
D-Digital Controls **
© KRUEGER 2012
8.UNIT ACCESSORIES: (X)(X)(X)(X)
0 - None
A- Motor Toggle Disconnect ***
F- Fan Motor Fuse
R- Induction Inlet Filter
Z- Induction Inlet Sensor
9. WATER HEAT: (XXX)
(ROWS/CONNECTION HAND)
000 -N/A / None
W11 -1 Row/Right/Unit Discharge
W12 -2 Row/Right/Unit Discharge
W21 -1 Row/Left/Unit Discharge
W22 -2 Row/Left/Unit Discharge
10. ELECTRIC HEAT: (XX) LINEAHEAT: (XX)
00 - None
00 - None
E2 - 208V/1-Phase
L2 - 208v/1-Phase
E3 - 240V/1-Phase
L3 - 240v/1-Phase
E4 - 277V/1-Phase
L4 - 277v/1-Phase
E6 - 208V/3-Phase/3-Wire L6 - 208v/3-Phase/3-Wire
E9 - 480V/3-Phase/4-Wire L9 - 480v/3-Phase/4-Wire
11.ELECTRIC HEAT STEPS: (X)
0 - None
1-S
ingle-Stage
2-T
wo-Stage
3-T
hree-Stage
UNDERFLOOR PRODUCTS
3.UNIT CASING CONTROL: (XX)
1L - Left Hand, 20 Gage
aluminum, mechanically bonded to tubes. Tubes shall be copper
with minimum wall thickness of 0.016” and with male solder
header connections. Coils shall be leak tested to 400 PSIG.
Number of coil rows and circuits shall be selected to provide
performance as required by the plans. Coil performance data
shall be based on tests run in accordance with AHRI Standard
410.
12.HEAT COIL ACCESSORIES: (X)(X)(X)(X)
0 -None
B-Mercury Contactors for Electronic Controls
C-Fuse Block
F -Manual Reset Cutout
G-Dust-tight Construction
K-Door-interlocking Fused Disconnect
L -Door-interlocking Non-fused Disconnect
* VCU or ACU controller for ECM motor option is available.
** Digital controls are supplied by others; mounted by Krueger.
*** Motor Toggle Disconnect not available with electric heat.
K
B
F
SAMPLE CONFIGURATION: KBF - 0 - 1L - 16 - D - 3 - D - FZ00 - W11
Providing You With Air Distribution Solutions
E3-45