KRUEGER CRFF-E Owner's manual

INSTALLATION,
OPERATION &
MAINTENANCE
Fan Filter Units
CRFF-E, CRFF-E-ARS,
& CRFF-E-ARSM
ECM Motors
Revision: 02.01.17

Installation, Operation, & Maintenance for CRFF-E Series
Page: 2 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Table of Contents
Installation ....................................................................................................................................................................4
Unit Control Box ..........................................................................................................................................................5
Universal Control Card Set Up...................................................................................................................................6
Troubleshooting ........................................................................................................................................................11
Infrared Speed Controller .........................................................................................................................................12
Pre-filter Cleaning (foam) ..........................................................................................................................................13
Service: Removal and Replacement of CRFF-E filters...........................................................................................14
Service: Removal and Replacement of Roomside Replaceable Filters.................................................................15
Service: CRFF-E & CRFF-E-ARS Motor Removal and Installation........................................................................16
Service: CRFF-E-ARSM Motor Removal and Installation.......................................................................................17
Technical Note: TN1004 Changing Motors in the Field..........................................................................................18
Unit Wiring Diagrams.................................................................................................................................................20
Drawing - CRFF-E Filter..............................................................................................................................................24
Critical Operations of the Fan Filter Unit...................................................................................................................3
Warnings.......................................................................................................................................................................3
Technical Note: TN1002 Design with VAV Boxes....................................................................................................18
Unit Replacement Parts List.......................................................................................................................................23
Drawing - CRFF-E-ARS & CRFF-E-ARSM Filter........................................................................................................25
Testing.........................................................................................................................................................................26

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 3 of 26
Critical Operation Conditions of the CRFF-E, CRFF-E-ARS and CRFF-E-ARSM
1. Touching of the HEPA filter could damage it, voiding the warranty on the filter. The screen is only to protect
against an accidental ‘touch’ of the filter. Never place a hand or tool on the filter. Never lay the filter face flat
down on a surface always have filter on its side or back to protect from damage
2. Prior to powering the unit, verify that the unit has been plugged into the correct voltage. The serial number label
on the top of the CRFF-E, CRFF-E-ARS and CRFF-E-ARSM unit has the required voltage.
3. For reorder purposes the CRFF-E, CRFF-E-ARS and CRFF-E-ARSM model number, configuration code and
serial number should be recorded. This information is located on the product and serial number labels, located
adjacent to the electrical box. If you cannot locate the FO# please contact Krueger for this information.
Read and Save These Instructions
To reduce the riskkof fire, electrical shock, or injury to persons, observe the following
1. Installation work and electrical wiring must be done by qualified person(s) in accordance with all applicable code
and standards, including fire-rated construction
2. When cutting or drilling into wall or ceiling, do not damage electrical wiring and other hidden utilities.
3. If this unit is to be installed over a tub or shower, it must be marked as appropriate for the application.
4. Use this unit only in the manner intended by the manufacturer. If you have any questions, contact the
manufacturer:
5. Before servicing or cleaning unit, switch power off at service panel and lock service panel to prevent power from
being switched on accidentally.
!
Note: Units come set in manual mode from
the factory. Please review installation
requirements and set up with your end user
(See page 7 for complete set up instructions).

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 4 of 26
Installation
The CRFF-E Series Critical Room Fan Filter Units are completely assembled at the factory with the exception of the
optional ¼” (0.64 cm)-20 eyebolts, which can be used when hanging the unit from an overhead structure.
1. Carefully remove the unit from the shipping carton and inspect for any damage that may have occurred during
transportation. (See Figure 1)
Note: When ordering CRFF-ARS and CRFF-ARSM units, the HEPA filters may be shipped separately to be
installed into units after the fan box has been installed.
Recommendation: Review mode settings at this time as specified for installation (see page 7 for controls).
2. If using rigidly supported grid (usually 2” or wider), raise unit through ceiling and lower onto the gasketed grid. If
using a flexible grid (typically supported with wires) the unit must be secured to an overhead structure with
eyebolts, s-hooks and chain. Screw the four eyebolts into the nutserts on the lid assembly before lifting into an
overhead position (see Figure 2)
3. Have an electrician wire the unit to the appropriate voltage (115V, 220V, 277V AC), according to the wiring
diagram and all national and local electric codes. All units are equipped with a three position terminal block for
field connection. Verify correct single phase power, before energizing units.
4. Turn on the power using the two position rocker switch (ON/OFF) located on the electrical box. For the CRFF-
ARS and CRFF-ARSM units, let the unit fur for a few hours to purge off particulate (if filters are shipped loose)
that may adhere to the inside of the unit before installing the filters. Do not run fan at full speed as this may cause
overload condition.
Note: Your fan filter may have been shipped separate. Controls have been shipped separately.
EYEBOLT
FAN FILTER
UNIT
FIGURE 1 - UNBOXING FIGURE 2 - HANGAR SUPPORTS

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 5 of 26
ON/OFF Switch - Speed/Airflow Adjustment
All CRFF-E series units are equipped with a two-position rocker switch (ON/OFF), which is located on the side of the
electrical box, on top of the unit. Unless otherwise specified, units are furnished with a Universal Control Card to
enable adjustment of airflow or set to preferred communication mode.
Note: The CAT5e/RJ45 network ports are non-directional (in or out). Be sure to examine your cabling to insure that
there is no cross-over wired cables.
CAT 5e
Network Cable Connection
(RJ45 Connector)
ON/OFF Switch RPM Test Probe Jack Comm.
Filter Indicator Light
Pressure Switch Adjuster Manual Speed Potentiometer
Filter Indicator Light Option
The pressure switch for the filter indicator light option is set at 0.60 in wc from the factory. The set point for the
pressure switch can be adjusted between 0.50 in wc and 3.00 in wc by turning the set screw, accessible for the front of
the control enclosure. Counterclockwise rotation will increase the set point differential for switching; clockwise rotation
will reduce the set point.
The process to adjust this for a specific application is detailed below:
1. Adjust fan to highest setting
2. Measure and note initial pressure differential between ceiling plenum and unit plenum (downstream of the fan
and upstream of the filter)
3. Restrict discharge airflow incrementally to increase differential pressure until measured value matches filter
loading requirements for the project
a. If no specific filter loading requirements are specified a general recommendation is to use twice the
pressure differential measured in step 2
4. With the unit discharge blocked, adjust the set point of the pressure switch
a. If the indicator light is illuminated, increase the set point of the pressure switch (CCW rotation) until the
light dims
b. If the indicator light is still dim, slowly decrease the set point of the pressure switch (CW rotation) until the
light illuminates
5. Remove obstruction(s) from the unit discharge
6. Adjust fan speed to operational set point

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 6 of 26
Universal Control Card Set Up (ENV1028)
CON4 UNIVERSAL CONTROL CARD - OVERVIEW
Krueger's ENV1028 Universal Control Card
provides MODBUS network and analog control
capabilities to a Krueger Fan Filter Unit equipped
with an electrically commutated motor. Three different
control modes provide installation versatility by allowing
the FFU to be controlled via MODBUS RTU network,
analog 0-10 VDC control signal, or by adjusting the
on-board potentiometer. The ENV1028 Universal
Control Card is fully compatible with all of Krueger’s
plug & play System Control Consoles using MODBUS
RTU. Additional details of the controls modes
are provided on page 7.
FEATURES
+Networkable Via MODBUS RTU
+ 0-10 VDC Analog Control
+ Manual Control Via Onboard Potentiometer
+ Simple Connections
- RJ45 For Networking Connection
- Screw Terminals For Analog Control
- Test Probe Jacks For DC mV Signal Output Of The Following:
- RPM
- Motor Control Set Point
+ LED Diagnostics
- Support for external LED (10mA) remote status notification via
2 Pin MTA connector
- On-board green LED for Board Status notification
- On-board red LED for Network Traffic
+ Powered from Network or Local Supply
COMMON INCOMING
POWER
24VAC
LED
CONNECTOR
CONTROL HARNESS
CONNECTOR
CONTROL
DIP SWITCH
ADDRESSING
DIP SWITCH
ANALOG INPUT “COM”
ANALOG INPUT “SIGNAL”
RPM TEST PROBE JACK “COM”RPM TEST PROBE JACK “SIGNAL”
GREEN LED FOR SYSTEM/RPM STATUS
RED LED FOR NET ACTIVITY
DUAL RJ-45 JACKS
FOR CAT5 CABLE
MANUAL SPEED POT
FIGURE 7: UNIVERSAL CARD OVERVIEW

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 7 of 26
Control Modes
The ENV1028 operates in one of three selectable modes.
The Mode is selected using the control DIP switch; MANUAL
control (on-board potentiometer), ANALOG control
(Remote 0-10 VDC), NETWORK control (MODBUS RTU).
The ENV1028 is shipped from the factory in NETWORK
control mode.
Manual Control Mode
In Manual control mode, the motor speed is set using the
onboard potentiometer. Onboard potentiometer rotation is
CW to increase the motor output.
Analog Control Mode
In ANALOG control mode, the motor output is set using an
external 0-10 VDC demand signal.
Network Control Mode
In NETWORK control mode, the motor output is set using
MODBUS Register 2. Motor output is specified as a value
from 0 to 100 representing a percentage of motor torque
output. Each ENV1028 in a MODBUS network must be
set to a unique address. The address value is set in
binary using the eight DIP switches of switch band (S2).
A maximum of 200 ENV1028 devices is recommended
per local area network (LAN).
NetworkkControl Mode (cont)
If a Krueger ACC Control Console is the MODBUS
master, then addresses should be assigned within the
address range supported by the Control Console.
Address zero should not be used as it is reserved for
global commands. Address switch settings are only
checked by the ENV1028 at power-up. Power must be
cycled (OFF/ON) before any changes take effect.
Registers relevant to this mode:
1
ON ADE02 21 3 4 5 6 7 8
O
N
2
1
ON ADE02 21 3 4 5 6 7 8
O
N
2
Manual Mode = 1 OFF 2 OFF
Analog Mode = 1 ON 2 OFF
Note: Network mode can be configured using either DIP switch setting shown
above. DIP switch pictorials are for reference and may be labeled differently by
the manufacturer.
1
ON ADE02 21 3 4 5 6 7 8
O
N
2
Network Mode = 1 OFF 2 ON
1
ON ADE02 21 3 4 5 6 7 8
O
N
2
Network Mode = 1 ON 2 ON
•Register 1 “Start/Stop” (R/W)
–To enable motor, write a value of 1; To disable
motor, write a value of 0
•Register 2 “Motor Set Speed” (R/W)
–Motor Target speed value. Values may be written
from 0 to 100
•Register 6 “RPM” (R)
–Motor RPM. Read from the motor
•Register 12 “Actual Motor Speed Instruction” (R)
–Speed control signal applied to the motor by the
ENV1028. (R/W) = Read/Write, (R) = Read Only

Installation, Operation, & Maintenance for CRFF-E Series
Page: 8 of 26
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Control Modes (continued)
Example of binary S2 switch settings
5 61 2 3 4 87
ON DIP
1
1 2 3 4 5 6 7 8
ON
DIP
11
1 2 43 5 6 87
ON
DIP
21
31 2 4 5 6 7 8
ON DIP
2
1 2 3 4 5 6 7 8
ON
DIP
12
21 3 4 5 6 7 8
ON
DIP
22
1 2 3 4 5 6 7 8
ON DIP
3
1 2 3 4 5 6 7 8
ON
DIP
13
1 2 3 4 5 6 7 8
ON
DIP
23

Installation, Operation, & Maintenance for CRFF-E Series
Page: 9 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Electrical Specification
Control and Interface Signals
External Speed 0-10V Input
•Input impedance 20k0hms.
•MIN ON-to-OFF threshold: 190mV*
•MAX OFF-to-ON threshold: 240mV*
•ON (-215mV) to 9.89V linearly scales 1 to 99% speed.
•9.89V or more deadbands to 100% speed.
External LED Output
•10mA regulated.
•LED forward voltages up to 5V.
RPM Signal
•Signal Value: mVDC = RPM
•Ex: 900mV = 900RPM
•RPM Output Range: - 0, 5 to 2000 RPM (0, 5mV to 2000 mV DC)
•RPM Output Resolution: 5RPM (zero, 400 steps from 5 to 2000 RPM inclusive)
Specificatio Min Typical Max Units
Input Voltage 22 24 42 VAC
Supply Frequency 50 50 / 60 60 Hz
Input Power Consumption n/a n/a 0.5 VA
Ambient Operating Temperature 0 25 50 C
RJ45 Network Cable Connections
12345678
Bus Power
Pass Through 0V (GND) RS-485 0V (GND) Bus Power
Pass Through
+ NC NC -
Net LED Status Definitio
Green LED OFF Power lost or no communications.
LED Flickering Network data traffic in progress
Green LED ON A/B network cables are swapped.
RED NETWORK LED GREEN STATUS LED
FIGURE 9: LED LIGHT LOCATIONS
Test Probe Jack Points
The test probe jacks may be used to measure the motor
rpm or the PWM signal that is being output to the motor.
•In Manual or Analog Control Mode with an Address
setting of 1 or greater, the test probe jacks output
0-2000 mVDC representing motor RPM. By changing
the address DIP switches to 0, the test probe jacks will
output 0-1000 mVDC representing 0-100% demand
signal to the motor. The address may be changed
without interrupting power to the control card.
•In Network Control Mode, 0-2000 mVDC always
represents RPM.
LED Indicators
•Onboard Status LED:
The Onboard Status LED is software controlled
by the unit microcontroller. The Status LED is solid
ON when RPM reported by the motor is greater than
zero and OFF when RPM reported by the motor is
zero.
•External Status LED:
Support for an external Status LED (10mA current-
controlled driver), via a 2-pin MTA connector, for
remote system status notification. The external Status
LED operates in the same manner as the Onboard
Status LED.
•Onboard Net LED:
The Onboard Net LED is driven directly by the receive
data signal. The NET LED shows all network traffic on
a 2-wire network. The NET LED is intended to
confirm low-level network connectivity,
independent of microcontroller or firmware
functionality. If A/B network wires are swapped, the
NET LED will be normally on, providing quick
diagnostics of this common condition.

Installation, Operation, & Maintenance for CRFF-E Series
Page: 10 of 26
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Communication Specification
Overview
• MODBUS RTU protocol over RS485 (serial).
• 9600 baud rate, word length is 8, parity is none(n), stop bits=1.
• 255 unique address values selectable by DIP switch settings. (Recommended network node capacity 200 nodes.)
• Slew rate limited transceivers for improved network performance.
• Do not use crossover cables. This may damage the control card or render it non-operational.
To reset non-volatile registers to factory default values, write 170 (AA hex) to Register 14, then cycle power.
Note: Register 24 may be read in network mode to determine the value of 0-10VDC signal that may be
connected. For example, a pressure transducer may be conected to indicate unit static pressure
MODBUS REGISTER SUMMARY TABLE
1
2
6
9
10
12
14
1
1
RUN/STOP
DEMAND
SPEED
STATUS
DEFAULT SPEED
CURRENT SPEED
DEFAULT RUN/STOP
RW
RW
RW
RW
R
R
R
0-100
0-100
0-100
0,1
0,1
0,5-2000
see detail
%
RPM
50
-
-
RAM
RAM
LIVE
LIVE
LIVE
EEPROM
EEPROM
power up from REG 14
power up from REG 10
applies to network only
applies in network mode only
Register Name R/W Values & Defaults Units Origin Comments
24
70-1000 LIVE
-
ANA1 Onboard Pot 0-1000=0-100%
0-1000 LIVE
-
ANA2 0-10V input 0-1000=0-10VDC
R
R

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 11 of 26
1. Check pre-filter media; replace or clean as
necessary.
2. Adjust visual speed control for higher blower output.
3. Check power supply for proper voltage, amperage
and distribution frequency.
4. Replace HEPA filter if the air velocity remains low.
1. Ensure that no large obstructions are upstream of
airflow pattern
2. Determine that no other air-moving devices are
operating in or around clean room which disrupt
room’s airflow pattern
3. Check air velocity and if low, conduct the “Low Air
Velocity” procedure outlined above.
4. Conduct smoke and photometer test on HEPA filte .
Seal or replace HEPA filter as necessar .
High Air Velocity
1. Adjust visual speed control for lower blower output.
Non-Laminar Flow and/or Excessive Contamination
Warranty
Please reference the Krueger website for Warranty
information located in the Terms and Conditions of Sales
document or click on the following link,
http://www.krueger-hvac.com/pdf/terms.pdf
Troubleshooting
Mode Choice
Verify mode setting choice to DIP switch S1 (Control
Mode), which is manual mode and then retry.
Motor Issues in Manual Mode
(If you are in a network or analog mode, contact your
controls contractor for troubleshooting assistance; if you
continue to need assistance, contact the factory.)
Unit is Not Adjustable
Verify that rotation of the knob does not change the
RPM or Flow Index display on the unit. If rotating does
nothing, remove the electrical box cover and remove the
4-pin connector from the Visual Speed control and install
in 180 degrees rotated. Again adjust the knob. The 4 pin
connector is on the 1/8” white conductor.
Low Air Velocity
CRFF Series Replacement Parts
Replacement parts are available through your authorized
Krueger representative.
Please visit the Krueger website at www.krueger-hvac.
com to find your local Krueger representative

Infrared Speed Control (Optional)
The Flow-Set is a handheld infrared remote control
configured to adjust the Krueger CRFF-E and CRFF-E-
ARS units.
An EVO/ECM-IRC control sends the ECM motors a
FLOW INDEX and a GO signal. The motor sends back
a status signal that is connected to a red lamp. The
control includes an infrared remote receiver.
The Flow-Set handheld remote sends infrared remote
commands to the EVO/ECM-IRC control, allowing remote
adjustment of the ECM motor. Using the Flow-Set, you
can turn the motor ON/OFF, adjust the flow index from
1-100 and read the current settings.
Point the Flow-Set at the Flow-Set target (red lamp if the
motor is on) on the equipment. Operate the ON/OFF
button or any of the four ↑↓ buttons. The green lamp near
the Flow-Set target lights, indicating you are in an
adjustment session. Continue to operate the on/off button
or any of the four ↑↓ buttons to achieve the desired
settings.
Press the Enter button to save your new settings and exit
the adjustment session. Press the Clear button to delete
your new settings, revert to the ECM settings and exit
the adjustment session. If you enter an adjustment
session and do not make any adjustments for 15
minutes, the adjustment session automatically clears.
Use the Clear button to read the current settings. Point
the Flow-Set at the Flow-Set target and press the Clear
button. A green lamp begins to flash indicating the signal
was received. The flash sequence indicates the current
flow index. The sequence occurs in two sets. The tens
(1st) set uses long flashes to indicate the tens digit. The
units (2nd) set uses short flashes to indicate the unit’s
digit. An extra long flash in the tens set or the units set
indicates the value of the corresponding digit is zero.
• A flow index of 24 flashes two longs, then 4 short
• A flow index of 89 flashes 8 longs, then 9 short
• A flow index of 30 flashes 3 longs, then an extra lon
• A flow index of 04 flashes an extra long, then 4 shor
• A flow index of 100 flashes 10 longs, then an extra lon
Use the ON/OFF button to turn the motor on or off. Point
the Flow-Set at the Flow-Set target on the equipment and
press the ON/OFF button. If you press Enter while the
mo-tor is off, the motor stays off, even through a power
ON/OFF cycle.
Adjust the flow index using the ↑↓ buttons. The ↑↓ button
pair on the left adjusts the index ↑↓ 10. The ↑↓ button pair
on the right adjusts the flow index ↑↓ 1. Using the ↑↓ 10
pair, you can quickly move the index up and down. Using
the ↑↓ 1 pair, you can precisely set the index to achieve
the desired flo . During an adjustment session, the green
lamp blinks each time you make a valid entry. If the flow
index is already 100, and you try to increase the flow
index, the green lamp does not blink, and the increase
does not occur. If the flow index is at 91 and you press
the ↑10 buttons, the green lamp does not blink and the
increase does not occur because your entry would take
the index above 100. When the flow index is greater than
90, use the ↑1 button to increase the index. The ↓1 and
↓10 keys respond in a like manner when you try to set
the flow index below 1. (Zero is not a valid flow index)
Batteries
Two AA batteries power the EVO/IRC-Masters. Remove
the sliding door on the back of the unit to expose the
battery compartment. Remove the old batteries. Insert
the new batteries in the position indicated by the battery
pictures molded into the bottom of the battery
compartment. The battery spring clips are difficult, so you
may need to use a small screwdriver to “shoehorn” the
batteries into place.
For maximum battery life, store the EVO/IRC-Masters so
the buttons are not pressed. While current drain is
minimum when the unit is not sending infrared signals,
some battery current is drawn to sense the pressed key.
Installation, Operation, & Maintenance for CRFF-E Series
Page: 12 of 26
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INFRARED REMOTE

Installation, Operation, & Maintenance for CRFF-E Series
Page: 13 of 26
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Cleaning the CRFF-E Prefilter
Disconnect the unit from the electrical
power source before attempting any
service.
Tools Required: None
Filter Dimensions: 23.25”x16”
1.
2.
3.
4.
To gain access to the prefilte , remove the ceiling
panel next to the unit, if applicable.
Switch the ON/OFF switch to the OFF position.
Remove the prefilter from the snap-in frame
(See Figure 1)
Clean the prefilter by hand washing in water with
mild detergent or by using a vacuum cleaner. Allow
prefilter to dry completely before replacing
5. Reassemble by reversing the above steps.
Note: To keep the lter in top operating condition, washing the
foam prelter is recommended every three to six months.
!
PREFILTER SURFACE ON TOP SIDE
SUPPORT SCREEN ON BOTTOM SIDE
FIGURE 1: BASIC UNIT ASSEMBLY
ON/OFF SWITCH

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Installation, Operation, & Maintenance for CRFF-E Series
Page: 14 of 26
Removal and Replacement of the
HEPA/ULPA Filter (CRFF-E Type Units)
Disconnect the unit from the electrical power source before attempting any service. The
standard filter is protected with an expanded metal face screen. This is never to be used
to handle the filter. It is only for protection against an accidental touch of the filter. Only
handle the filter by the frame
Tools Required: Phillips Head Driver, Battery Operated Drill with 5/32 drill bit, Rivet Hand Tool, 5/32 aluminum grip
range .126-.187
1. Remove unit from ceiling.
2. Remove the 10 screws holding the HEPA/ULPA filter to the lid assembly.
3. Lift the lid assembly off the HEPA/ULPA filter. (See Figure 1) Remove filter deflectors using 5/32 drill bit. Keep filter
deflectors to install in new filter. Discard the used filter as per requirements of the applicable
regulations. Carefully install the filter deflectors into the new filter using the 5/32 rivets. Do not touch or place the
filter deflectors on the HEPA/ULPA media pack. This could cause tears in the filter pack.
4. Before replacing with the new filter, carefully inspect the new filter for any visible damage. Also inspect the gasket
and the T-Bar to insure a tight seal. Replace if necessary.
5. To replace a filter, raise the filter and rotate into position in the ceiling grid (with power off), then lower the plenum
housing into place. Reconnect wiring and hardware from previous steps that have
been removed.
6. Restore power and verify proper operation of CRFF-E.
!
Figure 1: Standard Filter Change
On/Off Switch
Lid Assembly
#8 Screws
(10x)
Ø5/32 Rivet
(6x)
HEPA/ULPA
filter
Filter Deflector
Electrical Knock-Out

Installation, Operation, & Maintenance for CRFF-E Series
Page: 15 of 26
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Removal and Installation of the Access Room Side Gel Seal Filter –
Extruded Aluminum Housing (CRFF-E-ARS Type Units)
Disconnect the unit from the electrical power source before attempting any service.
The ARS filter is protected with an expanded metal face screen. This is never to be used to
handle the filter. It is only for protection against an accidental touch of the filter. Only handle
the filter by the frame
Tools Required: Phillips Head Driver, Battery Operated Drill, 3/16” hex head ball driver (2ea)
Manpower Required: 2
1. With the power off, remove the diffuser screen by removing the 6 each 10-32x1/2 screws, then carefully place in
a safe location.
2. Loosen the six 1/4x12 socket head screws far enough to rotate the eight filter clips 90°. The filter may be loose
enough to drop during this operation. If not, slowly pull the filter away from the knife-edge seal, taking care not to
touch the filter face during this operation. It is important to pull the filter slowly away from the seal, so that the gel
remains in the filter gel track.
3. Carefully clean plenum assembly knife edge surface of residual gel material.
4. Inspect filter for visible damage, if damaged set aside for replacement or repair.
5. Inspect the gel seal, if reinstalling the removed filter. Determine if the gel has lost its ability to seal (i.e. the gel
should reform to cover the track without voids or openings), if so repair the gel material or consider replacement
of filter.
6. Place the filter evenly against the filter-sealing surface of the unit. Reposition filter clips and screws. The clips
should be rotated and angled into place. It is recommended that four workers work on each corner of the filter
simultaneously, holding the filter seated into the track. Hand tighten clips from opposite corners evenly until all
clamps are tightened.
7. Reinstall diffuser screen by hand-tightening the screws.
8. Determine if recertification or testing of replacement is required.
9. Restore power to FFU and verify proper operation of FFU.
!
RSR/E Sheet Metal Filter Replacement
Filter
Filter Clip
¼ -20
Cap
Screw
10-32
PHP
Screws
Knife- Edge
Seal
Gel Track
Diffuser
Screen
CRFF-E-ARS & CRFF-E-ARSM Filter Change
Fan Filter Unit
Filter
2-Piece Welded
Plenum Housing
Filter Clip and
Screw (typ 6)
Diffuser Screen
Screws (typ 6)

Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Installation, Operation, & Maintenance for CRFF-E Series
Page: 16 of 26
Removal and Installation of the Motor (CRFF-E and CRFF-E-ARS Models)
Disconnect the unit from the electrical power source before attempting any service.
Electrical service should be performed by licensed electricians or authorized KRUEGER
service technicians.
Tools Required: Phillips Head Driver, Battery Operated Drill, (2) 8" adjustable wrenches, 3/8” (10mm) Hex Head Wrench,
Pliers, and #2 Screwdriver
1. To gain access to the motor, remove the ceiling panel next to the unit, if applicable.
2. Switch the ON-OFF switch to the off position.
3. Remove the prefilter o f the prefilter frame. (See Figure 4)
4. Loosen the electrical box cover screws (2), and slide/lift off cover. (See Figure 4)
5. Make note of all wire locations for re-installation later.
6. Disconnect 5-pin and 16-pin wire harnesses from the electrical box housing and remove tubing for test port, if
installed.
7. Remove the eight mounting screws to free the motor/blower assembly from the lid assembly. If using power
drivers, set the unit to a low torque setting to avoid stripping the sheet metal screws. Carefully remove housing
assembly, paying attention to wire routing. (See Figure 4)
8. Using an adjustable wrench loosen the two set screws that attach the blower wheel to the motor shaft.
9. Mark the location of the motor support bracket (belly band), then loosen the bolt just enough to allow the motor
support bracket to slid off the motor.
10. Using the removed motor, mark the new motor with the location of the motor support bracket.
11. Replace with the new motor and reassemble by reversing the above steps 1-8. Set the spacing at 0.25” (6.35
mm) clearance between the blower and the upper motor plate/prefilter frame. This will give a 0.11” overlap
between the venturi ring and the blower.
!
FIGURE 4: MOTOR REPLACEMENT
PREFILTER
ON/OFF SWITCH
VENTURI RING
MOTOR
BLOWER WHEEL
Power Entrance

Installation, Operation, & Maintenance for CRFF-E Series
Page: 17 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Removal and Installation of the CRFF-E-ARSM with Access Room Side Motor
Disconnect the unit from the electrical power source before attempting any service.
Electrical service should be performed by licensed electricians or authorized KRUEGER
service technicians.
1. To gain access to the motor, remove the gel seal filter (See Figure 5)
2. Prior to removing motor/blower assembly, remove blower wheel to expose motor connectors on motor. Using an
adjustable wrench loosen the two set screws that attach the blower wheel to the motor shaft. Disconnect the two
brown wires from the capacitor, using a pair of pliers. Disconnect 5-pin and 16-pin wire harnesses from the
electrical box housing and remove the tubing for test port, if installed.
3. While supporting the motor/blower assembly from below, remove the six machine screws that secure the venturi
ring to the bottom face of the lid.
4. Using a 5/32” (0.40 cm) Allen wrench, remove the blower wheel from the motor shaft. Remove motor from the
venturi ring by removing the three # 10 bolts.
5. Before removal of the motor mount bracket, measure the precise location of the bracket on the motor. Remove
the bracket.
6. Replace with the new motor and reassemble by reversing the above steps. Set the location of the motor mount
bracket as measured (see above Step 6). Set the spacing at 0.25” (6.35 mm) clearance between the blower and
the upper motor plate/prefilter frame creating a 0.11” (2.80 mm) overlap between the wheel and the venturi ring.
When reinstalling the assembly, align the plate to insure that the leads will reach the electrical box.
GROMMET
MACHINE
SCREW
AND WASHER
WELLNUT
VENTURI
RING
BLOWER
WHEEL
MOTOR
!
FIGURE 5: CRFF-ARSM WITH ROOM SIDE ACCESSIBLE MOTOR REPLACEMENT
SCREEN
GEL SEAL
FILTER
BAFFLE
ASSEMBLY
MOTOR / BLOWER
ASSEMBLY
ELECTRICAL
CONNECTORS
LOCATED IN
THE INNER
PREFILTER WALL
PLENUM
Tools Required: 3/16""Ball Driver, Phillips screw bit, Head Driver, Battery Operated Drill, (2) 8” adjustable
wrenches, 3/8" (10 mm) hex head wrench, #2 standard screwdriver, and pliers.

Installation, Operation, & Maintenance for CRFF-E Series
Page: 18 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Old Cable Style
Old Cable Style
New Cable Style
Technical Notes
Changing out from GE 2.3 to Nidec PerfectSpeed DC
Motors in the field The Krueger family of Fan
Filter Units has previously used the GE 2.3 motor
that was purchased by Regal Beloit. The older models
have GE 2.3 motors that have become obsolete
and are replaced with the new Regal Beloit model
EON. The EON motor is currently being evaluated and
you will be receiving a new manufactured motor
named Nidec PerfectSpeed.
When you order a replacement motor they will be a
form and fit replacement, except for the cable that
connects to the control board and the motor. The new Nidec
motor will require you to replace the cable. The old
cable was a sixteen pin connector while the new motor
cable will have a four pin connector as shown in the photo to
the right.
Please use the new cable with the new four pin connector
to connect your new motor. The cable number will be
determined by the build style of your unit.
Nidec Part References
63751-015
63751-016
•18 in Standard Build
•12 in FFDERA Build
•15 ft Whip 63751-017
Old Cable References
The power cable, has remained the same for the new
motor and will be reused. The rest of the fit and function will
be a direct replacement. Follow the procedure in the IOM for
motor swap for your particular FFU.

Installation, Operation, & Maintenance for CRFF-E Series
Page: 19 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Technical Notes (continued)
Designs with Duct Collar, VAV or constant air box and fan coils
For applications requiring powered fan filter units and a ducted connection
our recommendation would be to use FFD, FFDR, or FFDRA units equipped
with PSC motors.
Caution
FFDE, FFDER, and FFDERA units are not recommend for use with ducted
systems, and cannot operate with inlet static pressure exceeding 0.30
in wg.
For applications when you use a VAV box or Constant Airflow Terminal,
Duct Collars or Fan coils. The design engineer must advise the contractor or
air balancer that the air supply needs to be balanced. If you do not balance
the air supply properly you have the potential to starve or over feed the
fan with air causing the motor to stall which can damage the fan motor.
This also can be minimized by notifying Titus beforehand for assistance.
The ECM motors used in the FFDE, FFDER, and FFDERA designs are a
Microprocessor controlled motor and are designed to maintain a constant
air volume. When two controllers are compensating the air volume at the
same time, the motor microprocessor is unable to stabilize the airflow and
will shut itself down if it cannot find a stable operating point.
In addition to properly balancing the airflow to the Fan, you should
prepare a sequence of operations turning on FFU’s prior to energizing the
Air Handler to prevent potential backward rotation of the blower wheel
which can prevent motor rotating in the proper direction and will reduce
airflow and cause eventual shutdown. The drive components inside the
ECM motors are self-testing and sized for the motor being used inside the
unit they can’t compete with the airflows from a duct blower motor.

Installation, Operation, & Maintenance for CRFF-E Series
Page: 20 of 26
Krueger | 1401 N Plano Rd | Richardson, TX 75081 | 972.680.9136 | [email protected] | www.krueger-hvac.com
Universal Card Wiring Diagram
4 pin
Control
Cable
5 pin
Power
Cable
4 Pin MTA
Motor Connector
Remote Run
Indicator LED
Wiring Diagrams
This manual suits for next models
2
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