4Front Engineered Solutions HVLS Series User manual


Installation, Operations,
Maintenance and Parts
Part No. 6015653B
Do not install, operate or service this product unless you
have read and understand the Safety Practices, Warnings,
and Installation and Operating Instructions contained in
this User’s Manual. Failure to do so could result in death
or serious injury.
This manual applies to fans
manufactured beginning May
2014 with serial numbers
F61111180 and higher.


©2014 4Front® Engineered Solutions, Inc.
2 6015653B — HVLS Fans May 2014
You may nd safety signal words such as DANGER, WARNING, CAUTION or NOTICE throughout this User’s
Manual. Their use is explained below:
Indicates an imminently hazardous situation which,
if not avoided, will result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided, could result in death or serious injury.
Indicates a potentially hazardous situation which, if
not avoided may result in minor or moderate injury.
Notice is used to address practices not related to
personal injury.
This is the safety alert symbol. It is used
to alert you to potential personal injury
hazards. Obey all safety messages that
follow this symbol to avoid possible death or injury.

Introduction .................................................................2
Safety Signal Words ..................................................2
Safety Practices..........................................................3
Owner’s Responsibilities ............................................4
Hardware ....................................................................5
Fan Kit ........................................................................6
Installation Considerations .........................................7
Installation ..................................................................9
Components and Specications ...............................16

Operating Instructions ..............................................17
Planned Maintenance ...............................................21
Troubleshooting Guide .............................................22
VFD Fault Codes ......................................................24
Fire Control System Option ......................................25
Electrical Schematics ...............................................26
Parts List...................................................................31
Warranty Information ................................................43
Distributor Information ..............................................44

Welcome and thank you for choosing this industrial fan from 4Front® Engineered Solutions, Inc.
This User’s Manual contains information that you need to safely install, operate and maintain the fan. It also
contains a complete parts list and information about ordering replacement parts. Please keep and read this User’s
Manual before using your new fan.

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 3

Read these safety practices before installing, operating
or servicing the fan. Failure to follow these safety
practices could result in death or serious injury.
READ AND FOLLOW THE OPERATING INSTRUCTIONS
IN THIS MANUAL BEFORE OPERATING THE FAN. If you
do not understand the instructions, ask your supervisor
to teach you how to use the fan.
Be certain to follow the instructions in this manual.
If you do not understand the instructions, ask your supervisor
to explain them to you or call your authorized local distributor.

Do not use this industrial fan until you have received proper
training. Improper use could result in property damage,
bodily injury and/or death. Read and follow the complete
OPERATING INSTRUCTIONS on pages 17-20 before use.
If you do not understand the instructions, ask your supervisor
to explain them to you or call your local distributor.
DO NOT USE THE FAN IF IT APPEARS DAMAGED OR
DOES NOT OPERATE PROPERLY. Inform your supervisor
immediately.
Do not operate the fan until all personnel, building structure
and moveable equipment are clear of all moving parts. Install
guards as required.
Do not install the fan unit onto structure of insufcient
strength. Consult a professional engineer or registered
architect. Improper installation of the fan could result in
death or serious injury.

Before service, inspection, or cleaning make certain
that the power is disconnected and properly locked out.
If the fan does not operate properly using the procedures
in this manual, BE CERTAIN TO REMOVE POWER FROM
THE UNIT AND LOCK-OUT THE DISCONNECT ON THE
POWER CIRCUIT. Call your local distributor for service.
Keep your body clear of moving parts at all times.
All electrical troubleshooting and repair must be done by a
qualied technician and meet all applicable codes.
If it is necessary to make troubleshooting checks inside the
VFD box with the power on, USE EXTREME CAUTION. Do
not place ngers or un-insulated tools inside the enclosure.
Touching wires or other parts inside the enclosure could
result in electrical shock, death or serious injury.
Variable Frequency Drive (VFD) fan controllers contain
high voltage capacitors. Before working on the fan
controller, ensure isolation of the main voltage supply
and verify voltage has bled off prior to beginning work.
Failure to do so may result in death or serious injury.
If you have problems or questions, contact your local
distributor for assistance.

©2014 4Front® Engineered Solutions, Inc.
4 6015653B — HVLS Fans May 2014
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The owner’s responsibilities include the following:
The owner should recognize the inherent danger of the
interface between the industrial fan and shop worker. The
owner should, therefore, train and instruct operators in the
safe use of the industrial fan.
Nameplates, cautions, instructions and posted warnings shall
not be obscured from the view of operating or maintenance
personnel for whom such warnings are intended. Warnings
which are worn or non-legible should be replaced.
Manufacturer’s recommended periodic maintenance and
inspection procedures in effect at date of shipment shall be
followed, and written records of the performance of these
procedures should be kept.
Industrial fans that are structurally damaged or have
experienced impacts from external sources, shall be removed
from service, inspected by the manufacturer’s authorized
representative, and repaired as needed before being placed
back in service.
The owner shall see that all nameplates and caution and
instruction markings or labels are in place and that the
appropriate operating and maintenance manuals are provided
to users.
Modications or alterations of industrial fans shall be made
only with written permission of the original manufacturer.

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 5

(x4) 1/2-13UNC x 2-1/2
Mount ─ Building
(x4) 1/2-13UNC lock nut
(x2) 1/2-13UNC x 4-1/2 bolt
(x2) 1/2 dia. washer
(x2) 1/2-13UNC nyloc lock nut
(x12) 3/8-16UNC lock nut
(x8) #12 14 x 3/4 TEKS
Guy wire assembly
Safety cable
Mount ─ Assembly
Mount ─ Blade
Mount ─ Fan cover
Identification labels
Fan diameter
Fan diameter
Voltage
Voltage
Fastener torque requirements
Description Torque Wrench size
1/2 dia mount hardware 44-48 ft-lbs. 3/4 hex
3/8 dia blade mount hardware 24-28 ft-lbs. 9/16 hex
3/8 dia safety bracket hardware 24-28 ft-lbs. 9/16 hex
1-3/4 dia hub retaining nut 125 ft-lbs. 1-3/4 hex
1/2 dia hub cover fastener 44-48 ft-lbs. 3/4 hex
Cable clamp, guy wire Secure tight 1/4 nut driver
Cable clamp, safety cable Secure tight 5/16 nut driver
5/16 nut driver
Motor cover fastener Secure tight
(x4) 1/2-13UNC x 1-1/4 bolt
(x4) 1/2-13UNC lock nut
Mount ─ Motor frame

©2014 4Front® Engineered Solutions, Inc.
6 6015653B — HVLS Fans May 2014

1. Blade Box – 5 each
2. Fan Motor Box
a. Motor/gearbox assembly with covers.
b. Remote control panel with junction box.
c. Category 5e cable set – 100 ft (one blue, one gray)
d. Mounting hardware. See page 5.
e. VFD box.

See iFAN user's manual 6015948.

• Wrenches: 7/16, 9/16, 3/4 (x2), 1/2
• Sockets: 7/16, 1/2, 9/16, 3/4, 1-3/4
• Nut drivers: 1/4, 5/16
• Torque wrench: 15-60 Ft-lbs (for use with sockets)
• Wire strippers
• 1/4" cable cutter
• Tape measure
• Spirit level, short
• Gloves
• For laminated wood beam installs, a drill and 1/2" dia.
drill bit are required.

1. Ensure that the supplied voltage matches the fan voltage.
A label containing voltage information specic to the
individual fan is located on top of the VFD box.
2. Ensure blade length matches fan model size. See Fig.
1. Consult fan model designation located on the side of
the fan powerhead frame.
3. Ensure all mounting hardware shown on page 5 is present.

Ensure fan number matches network layout. Consult the
round, network ID number label on shipping box.


In accordance with NFPA 13 Standard from the National Fire
Prevention Association as referenced in sections 12.1.4 and
11.1.7: High Volume Low Speed (HVLS) Fans: The installation
of HVLS fans in buildings equipped with sprinklers, including
ESFR sprinklers, shall comply with the following:
• The maximum fan diameter shall be 24 feet (7.3 m).
• The fan shall be approximately centered between four
adjacent sprinklers.
• The vertical clearance from the fan to sprinkler deector
shall be a minimum of 3 feet (0.9 m).
• All fans shall be interlocked to shut down immediately
upon receiving a water ow signal from the alarm system
in accordance with the requirements of NFPA 72- National
Fire Alarm and Signaling Code.

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 7
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


For roof angles in excess of 20°, consult factory. The extension lengths shown are minimum recommendations only, based
solely of roof pitch and fan diameter. Other considerations must be evaluated when determining extension requirements,
such as placement of lights, sprinkler systems, HVAC systems, etc. In addition, OSHA requirements state that fan blades
must be a minimum of 10' above the oor.
*Consult your local distributor for assistance with fan placement and extension selection.
Roof slope = rise
run rise
run
Angled roof beam
Exclusion zone
Extension (optional)
Pendant
light
Length
(ft.)
12" (std. with fan)
Blade length
24"
radius
Fig. 1
300
300
300
300
300
300
300
300
300
Roof Slope*
2/12 4/12
Roof Angle* 9.5° 18.4°
Fan Diameter (Ft)
Recommended Extension Length (Ft)
Exclusion Zone
Radius (In.)
8
6
N/A N/A
8 N/A N/A 1 1 2
10 N/A 2
12 N/A 2
1
1
14 2 3
16 2 4
18 3 4
20 3 5
24 4 6
Hanging
Weight
(Lb)
Maximum
Torque
(Ft. Lb)
160
140
181
190
194
208
203
220
258
N/A
3/12
14.0°
N/A
3
4
4
5
N/A N/A
Extension Length (Ft.)
15
15
15
15
15
30
30
30
30
Blade length (In.)
27.5
25.0
39.5
51.5
63.5
75.5
87.5
99.5
123.5
2

©2014 4Front® Engineered Solutions, Inc.
8 6015653B — HVLS Fans May 2014
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
For open structure roof designs, the fan should only be hung
from either I-beam or angle iron. Do not hang from purlins,
joists or truss structure.
For solid beam or laminated wood beam mounting, use the
laminated wood beam mounting kit available from 4Front.
Consult a professional engineer or registered architect for
specic mounting concerns.
Ensure fan blade clearance meets the requirements. See
Fig. 1.

Consult your local distributor to help you plan the most
efcient installation of your fans.
Ensure fan placement is such that the fans blades are a
minimum of 10' from any manned working suface (oor or
mezzanine)
Ensure fan blade does not extend into exclusion zone.
Extensions are available if required. See Fig. 1.
Avoid mounting fans directly under lights or skylights to
avoid visual strobing affect.

If the fan is part of a networked system, ensure placement is in
accordance with the building layout. Fan network identication
number is located on the front panel of the VFD box.

Be certain to comply with all local and national codes during
installation.
Fig. 2
1/2-13UNC x 4-1/2 (x2)
1/2 dia washer (x2)
Pivot bracket
Mount tube

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 9

Fig. 4
Building structure
Clamp plate
Shim
Fig. 3
Pivot bolt
Shim (x2)
(as req’d)
1/2-13UNC x 2-1/2 bolts (x4)
1/2-13UNC
lock nut (x4) Angle
adjustment
bolt

1. Fasten pivot brackets to the extension tube with ears
outboard. Leave the 1/2" dia. x 4-1/2" bolts and nylock
nuts nger tight. See Fig. 2.


1. Locate fan mount assembly on bottom of building support
beam. Align mount assembly so that it is centered and
square to the beam. Orient mount such that the pivoting
axis is aligned with the building slope if required. See Fig.
3.
2. Install clamps. For thick ange I-beams add shims as
required. Fasten using the supplied 1/2" dia x 2-1/2"
screws, lock nuts and washers. Torque to 44-48 ft-lbs.
See Fig. 4.

©2014 4Front® Engineered Solutions, Inc.
10 6015653B — HVLS Fans May 2014
If building support beam is not level, ensure proper
fan clearance using the mounting information shown
on page 7 or add mounting extensions as required to
ensure clearance. See Fig. 1.


1. Attach laminated wood beam brackets to the wooden
beam using a minimum of four 1/2" dia. grade 5 thru bolts
(not supplied). Ensure brackets are square to the bottom
of the beam.
2. Attach mount assembly to the laminated wood beam
brackets using the supplied 1/2" dia x 2-1/2" screws,
nylock lock nuts and washers. Torque to 44-48 ft-lbs. See
Fig. 5.

1. Using a powered lift, orient the powerhead with the blade
hub down. Block motor as required for installation using
the bottom of the frame assembly. Do not support using
the hub or hub cap.

Fan powerhead may be oriented as required for aesthetics
or commonality.
2. Raise the powerhead up until it contacts the bottom of
the fan mount assembly. See Fig. 6.
3. Immediately attach safety cable. See Fig. 8.
a. Slide two of the supplied 1/4" dia cable clamps over
each end of the cable spaced 6" apart.
b. Slide the ends through the cable clamps.
c. Make sure that the cable goes through the motor
frame.
e. Securely tighten the clamp fasteners. Make sure the
u-bolts are over the free ends of the cable.
f. Ensure assembly does not interfere with fan motor
housing.
4. Fasten the powerhead to the mount assembly using the
supplied 1/2" dia x 1-1/4" bolts, nylock lock nuts and
washers. Torque to 44-48 ft-lbs. See Fig. 7.
If a mounting extension has been used, it may be necessary
to obtain a longer cable from a local supplier.
Fig. 5
Fig. 6
Fig. 7
 continued
Laminated wood
beam bracket
Laminated wood beam
Mount tube
Powerhead
1/2-13UNC x 1-1/4
bolt (x4)
1/2-13UNC
lock nut (x4)

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 11

Guy wires are designed to constrain lateral movement of the
fan in operation. This movement may be due to impacts on
the fan or winds impinging on the blades that would cause
the fan to sway.
Failure to attach guy wires may result in loss of warranty.
If a mounting extension has been used, ensure that the
longer guy wires accompanying the extension are used.
Ensure that the angle formed by the guy wire with the
roof structure is less than 45º. See Fig. 10. Avoid any
sharp edges or corners to reduce fatiguing and fraying
of the guy wires. Failure to attach guy wires may result
in severe injury or death.
1. Adjust turnbuckles to their longest position.
2. Attach the quick link with attached turnbuckle to the fan
as shown. Repeat for all four quick links.
3. Attach one end of the guy wire to the building structure.
Ensure the structure has sufcient strength to withstand
the wire tension. Repeat for all four guy wires.
a. Slide two of the supplied 1/8" dia cable clamps over
one end of the wire.
b. Feed that end of the wire though the building structure
and back through the clamp fasteners.
c. Securely tighten the clamp fasteners so that it cannot
slip. Make sure the u-bolts are over the free end of
the cable.
4. Individually tighten the turn buckle on each cable until
each cable is taut and the powerhead unit hangs plumb.
Use a spirit level to verify powerhead unit hangs plumb.
5. Tighten pivot and angle adjustment bolts on fan mount.
Torque to 44-48 ft-lbs. See Fig. 3.
<45º
Angle
adjustment bolt
Pivot bolt
<45º
Fig. 8
Fig. 10
Fig. 9
 continued
Safety cable
Space cable
clamps 6" apart
Guy wires
Quick link
Turnbuckle

©2014 4Front® Engineered Solutions, Inc.
12 6015653B — HVLS Fans May 2014
 continued
Fig. 11
Fig. 13
Fig. 14
Fig. 12


Blade assemblies come pre-assembled from the factory. Do
not attempt to disassemble.
1. The hub assembly has special blade retention lock nuts
pre-assembled to it. Remove them now and use them to
mount the blade assemblies in the steps below. Use only
the factory supplied lock nuts provided for blade mounting.
2. With the blade oriented such that the blade retention
lanyard is on top, support the blade assembly from below,
orient and guide the assembly onto the top attachment
studs on the hub assembly. Spread the strut arms slightly
using the provided spreader tool to facilitate installation
onto the upper studs as shown. Angle the blade upward
as needed to slide blade onto studs. See Fig. 11.
3. Still supporting the blade assembly, rotate the blade
assembly down as shown and allow the bottom blade
strut to ride up and over the bottom attachment studs on
the hub assembly. See Fig. 12.
Do not lean on blade. Damage to strut may occur.
4. Install blade retention lock nuts. Ensure blade lanyard
is assembled onto trailing edge stud. Hand tighten nuts
ensuring strut arms are rmly pressing against hub. Torque
blade retention nuts to 24-28 ft-lbs. See Fig. 13.
5. Repeat for each blade assembly.

1. Locate ventilation plug on gearbox. See Fig. 14.
2. Pull and remove plastic shipping brace and discard.
3. Remove orange brace removal note and discard.
Blade lanyard
Blade retention lock nuts
Brace removal note
Plastic
shipping
brace
Ventillation
plug

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 13
 continued

1. Ensure that the motor SO cable has been routed to VFD
box and is secured. See electrical installation instructions.
2. Locate each motor cover and install the cover fasteners.
Do not overtighten. See Fig. 15.

1. Rotate fan by hand and observe clearance of each blade
with closest obstruction. If necessary, reposition fan.
Blade tips droop when not in operation and rise when in
operation. Reference chart on page 7 for min. clearance.
2. Verify guy wire tension by attempting to move powerhead
in any horizontal direction. If movement is detected, re-
tension guy wires.
3. Lock the individual turnbuckles using the stop nut on each
and secure it with the turnbuckle strap. See Fig. 16.

Before doing any electrical work, make certain the power
is disconnected and properly locked or tagged off. Failure
to do so may result in death or serious injury. All electrical
troubleshooting and repair must be done by a qualied
technician and meet all applicable codes. Do not route
control wiring for any other device through the control
box. Ensure that the voltage and phase of the incoming
power agrees with the label located on top of the VFD
box and fan. Be certain power is off when wiring to the
control box. Failure to do so could result in electrical
shock, death or serious injury.


Reference wiring diagrams on pages 26-30 for all eld
connections.
Do not over-torque mounting screws. Damage to display
screen may occur if mounting screws are over-torqued.
It is the installer’s responsibility to torque properly.
Fig. 15
Fig. 16
Turbuckle strap

©2014 4Front® Engineered Solutions, Inc.
14 6015653B — HVLS Fans May 2014
 continued
Fig. 17
Touch screen
1/2 NPT port
60"
Touch screen
(back view)
6015651
To blue label
bulkhead
connector
Blue label
bulkhead
connector
WHT/BRN
BRN
WHT/GRN
GRN
Gray
diagnostic
connector
Power from
building
source
S.O. cable
from fan
VFD box
(top view) Voltage
label
See Fig. 37

The VFD box must be installed outside and a safe distance
from the blade diameter for service purposes.
1. Verify voltage and phase before mounting. Ensure voltage
shown on VFD box is correct.
2. Mount VFD box outside the fan blade arc. Orient box
such that front panel is accessible and visible with the
connectors on top of the panel.
3. Route the fan S.O. cable from the fan to the VFD box.
Ensure the cable is supported throughout its routing. See
Fig 17.
4. Route supply power from the building source to the VFD
box.
5. Wire VFD box in accordance with electrical schematics
located on pages 26-30.
6. Attach remote signal (blue) and diagnostic (gray) CAT5e
cables.

1. Mount touch screen remote to factory supplied junction
box inside building 60" above the oor as close to the fan
assembly as practical. Direct line of sight is preferred. See
Fig 17.

Blue CAT5e cable has terminated ferrules at the remote end.
PROTECT these ferrules during cable routing.
2. Route the factory supplied blue cable 6015651 and the
gray cable (6011643) from the top of the VFD box, through
the hole in the factory supplied junction box shown in the
upper view of Fig. 17 and wire the 4 leads of the blue cable
to the orange connector of the touch screen remote control
as shown in the lower view of Fig 17. Coil approximately
6' of the gray cable in the junction box and secure. Excess
blue and gray cable length should be neatly coiled and
secured near VFD box.

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 15
 continued
3. Mount the touch screen to the junction box using the
fasteners provided.

DO NOT over-torque the mounting screws. Damage to the
display screen is possible. It is the installer’s responsibility to
torque properly.

For cable runs exceeding 1000', consult your local distributor.

Once installation is complete, the initial view of the touchscreen
control will prompt the installer to set and conrm the fan size.
Use the  arrows to select the size of the fan and
press the  button. Ensure selected size matches the size
specied on the label on the front of the VFD box. If it matches
select the button on the following conrmation screen,
if it differs, select the button and try again. See Fig. 18.
Operate the industrial fan following the operating instructions
beginning on page 17. Check for proper rotation direction,
stability and noise level.
Train authorized personnel how to use the industrial fan
using the operating procedures located on pages 17-20 of
this manual.

     

Fan size
UP/DOWN
arrows
SET
button
SET
24 FT
Use the UP/DOWN arrows to
select the size of the fan and
press the SET button.
Fan size
YES NO
24 FT
Is the size displayed
above correct?
Fig. 18

©2014 4Front® Engineered Solutions, Inc.
16 6015653B — HVLS Fans May 2014

– NEMA 1, Solid State VFD (Variable Frequency
Drive), 120VAC 1PH, 208-240VAC 1PH, 208 – 480 VAC, 3PH,
line reactor (where required), Class CC fuses, UL and UL-C
listed panel and components. Power disconnect.

NEMA standard T.E.F.C., 1-2 HP, continuous duty single or
three phase

Double helical gear reduced, sealed lubrication.
VFD box
VFD unit
Blade
Winglet
Motor cover
Powerhead
Safety cable
Clamp
Universal mount
Guy wires
Fig. 19

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 17

Fig. 20
Start/Stop
RPM increase
Reverse
Communication status
(Green - Comm)
(Black - No Comm)
Forward
Diagnostic
screen
RPM decrease
24
Software version Fan diameter


©2014 4Front® Engineered Solutions, Inc.
18 6015653B — HVLS Fans May 2014
 continued
Before operating the industrial fan, read and follow the
Safety Practices, Warnings and Operating Instructions
in this manual. Use by untrained personnel could result
in death or serious injury.

1. Voltage/phase.
2. Obstruction clearance.
3. Safety cables present and properly installed.
4. All fasteners are properly torqued.

Visually inspect the fan to ensure that there are no obstructions
or personnel in the movement area.

If the password has been enabled, you must log in before
operating the fan.


Default password: 1111

1. Verify normal communication — the communication status
symbol in bottom lefthand corner will be green.
2. Set desired speed by pressing either  or
 until desired speed is displayed. Maximum
speed is 10, minimum speed is 1. See Fig. 21.
3. Select fan direction by selecting either  or .

1. Select either  or . It is not necessary to
stop the fan rst.

The diagnostic screen (see Fig. 22) contains:
 information. Contact this provider for all
fan service issues.
:
VFD serial number
Fan power/voltage
Motor Speed (x10)
Motor Current (x10)
Drive Status

Fig. 21
Fan speed
Fig. 22
Return
to main
screen
Service
provider

©2014 4Front® Engineered Solutions, Inc.
May 2014 6015653B — HVLS Fans 19
 continued
Fig. 23
Return
to
diagnostic
screen
Fault code alarm

If a fault code alarm appears, select the button
to display the fault codes,.
To navigate back to the main screen, Select the green return
arrow.
The fault code screen will display the current fault code number
and gives a description of each fault code. If the fan is currently
under fault, the error code being displayed in the box under
the green arrow will be displaying a number that caused the
fault. Match the number with the error codes and remove the
fault condition. Once the condition has been removed, pressing
the reset button will reset the fan and allow operation again.
Note that the error code will still be displayed in the box as
it will continue to display the most recent fault. Finally, the
green arrow in the upper right corner will navigate back to
the diagnostic screen. See Fig. 23.

©2014 4Front® Engineered Solutions, Inc.
20 6015653B — HVLS Fans May 2014
 continued

The remote is capable of password protection to prevent
unauthorized use.
1. Press the button from the main screen.
2. Press the  button on the diagnostic screen.

If the password has already been previously customized,
enter it now. If not, the default password: 1111
On the password screen, the options are to enable the
password, disable the password and change the password.
By default, the password is not enabled.
To enable password, ensure the box is checked.
To disable password, ensure the box is un-
checked.

1. Enter the desired password using the numeric keypad.
2. Press the  button. See Fig. 24.


When the password is enabled, the unit will automatically
log out after 2 minutes. To return to diagnostic screen, select
green return arrow.
Fig. 24