Vents VUT 300 WH EC Mounting instructions

USER’S OPERATION MANUAL
VUT 300 WH EC
VUT 400 WH EC
VUT 600 WH EC
AIR HANDLING UNIT WITH HEAT RECOVERY

2VUT .. WH 
Introduction
Use
Delivery set
Structural designation key
Technical data
Safety requirements
Structure and operating logic
Mounting and set-up
Condensate drainage
Connection to power mains
Unit control
Functional diagram
Technical maintenance
Fault handling
Storage and transportation rules
Manufacturer’s warranty
Acceptance certicate
Electrical connection certicate
Warranty card
CONTENT
3
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7
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12
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3
INTRODUCTION
USE
The unit is not designed to be used by children, physically or mentally disabled
persons, persons with sensory disorder, persons with no appropriate experience or
expertise.
The unit can be operated by qualied experts after appropriate instruction about its
use and operation.
Install the unit to be out of reach of children.
DELIVERY SET
Unit - 1 pce;
Remote control panel -1 pce;
User’s operation manual -1 pce;
Packing box - 1 pce;
The present user’s operation manual contains technical description, data sheet, installation and
mounting guidelines for the air handling unit with heat recovery VUT WH EC, VENTS series (hereinafter
referred as the unit).
The unit is designed to save thermal energy by means of heat recovery and is one of the energy
saving components used in buildings and premises.
The units with heat recovery and water heater are designed to provide permanent controllable
air exchange by mechanical ventilation in houses, oces, hotels, cafés, meeting halls and other
mechanically ventilated premises as well as utilization of extract air heat energy to warm up supply
puried air.
The system is designed to enable considerable energy saving. It has the function of automatic
heat exchange and ventilation mode which is set by automatic ventilation mode.
The unit is equipped with a water heater for further
The unit is a component unit and is not designed for independent operation.
Transporting medium must not contain any ammable or explosive mixtures, evaporation of
chemicals, coarse dust, soot and oil particles, sticky substances, brous materials, pathogens or any
other harmful substances.

4VUT .. WH 
The unit is designed for indoor application with the ambient temperature ranging from +1°C up
to +40°C and relative humidity up to 80%.
Ingress Protection (IP) rating from solid objects and liquids:
IP 44 for the unit motors;
IP 22 for the assembled unit connected to the air ducts.
The unit overall and connecting dimensions, external view, technical data are shown in g. 1 and
in table 1.
The unit design is regularly being improved, so some models can slightly dier from those ones
described in this manual.
TECHNICAL DATA
STRUCTURAL DESIGNATION KEY
VUT XXX X W H ЕС
Motor type
EC - electronically commutated
motor
Air capacity [m3/h]
Unit type
VUT - ventilation with energy utilization
Spigot orientation
H - horizontal
Heater type
W - water heater
Modication (spigot Ø)
1 -150 mm, 2 - 160 mm
Fig. 1. Unit overall and connecting dimensions
231 127
249
88
500
D
403
1198
1092
1137

5
Type VUT 300-1
WH ЕС VUT 300-2 WH ЕС VUT 400 WH ЕС VUT 600 WH ЕС
Voltage, 50 Hz [V] 1 ~ 230
Max. fan power [W] 2 items x 70 2 items x 70 2 items x175 2 items х 175
Max. fan current [A] 2 items х 0,6 2 items х 0,6 2 items х 1,3 2 items х 1,3
Number of heating coils 2
Total unit power [W] 0,14 0,35
Total unit current [A] 1,2 2,6
Max. air capacity, m3/h 300 300 400 550
Rotation speed [min -1] 1380 1380 1340 2150
Noise level, 3 m [dB(A)] 24-45 28-47
Max. transporting air temperature [°C] from -25 up to +60
Casing material Aluzinc
Insulation 25 mm mineral wool
Filter: extract G4
supply F7 (EU7)
Connected duct diameter [mm] Ø150 Ø160 Ø200 Ø200
Weight [kg] 40
Heat recovery eciency up to 90%
Heat exchanger type Counter-ow
Heat exchanger material Polystyrene
Table 1
The basic thermal dynamic characteristics of the water heaters are stated in the performance
charts, g. 2.

6VUT .. WH 
Fig. 2 Calculation of water heater parameters
VUT 300 WH EC, VUT 400 WH EC
VUT 600 WH EC
Air temperature after heater [°C]
Air ow through the heater [m3/h]
Water ow through the water heating coils [l/s]
Water pressure drop [kPa]
External air temperature [°C]
Coil heating capacity [kW]
Water heater parameters calculation example:
 Supply air temperature. Prolong the line (1) of air ow (300 m
3
/h) up to the point where it crosses the outside air temperature (blue curve), e.g. -20°C; then draw a horizontal line (2) from this point to the
left till crossing water in/out temperature curve (90/70). From this point draw a vertical line (3) to the supply air temperature axis on top of the graphic (+18 °C).
 Heating coil capacity. Prolong the line (1) up to the point where it crosses the outside air temperature -20°C (red curve) and draw a horizontal line (4) from this point to the right until it crosses water in/out
temperature curve (90/70), from here draw a vertical line (5) up to the scale representing the heating coil capacity (4.75 kW).
 Water ow. Prolong the line (5) down to water ow axis at the bottom of the graphic (6) (0.72 l/s).
 Water pressure drop. Draw the line (7) from the point where line (6) crosses the black curve to the pressure drop axis. (3.5 kPa).
Water heater parameters calculation example:
 Supply air temperature. Prolong the line (1) of air ow (400 m
3
/h) up to the point where it crosses the outside air temperature (blue curve), e.g. -20°C; then draw a horizontal line (2) from this point to the
left till crossing water in/out temperature curve (90/70). From this point draw a vertical line (3) to the supply air temperature axis on top of the graphic (+18 °C).
 Heating coil capacity. Prolong the line (1) up to the point where it crosses the outside air temperature -20°C (red curve) and draw a horizontal line (4) from this point to the right until it crosses water in/out
temperature curve (90/70), from here draw a vertical line (5) up to the scale representing the heating coil capacity (5.9 kW).
 Water ow. Prolong the line (5) down to water ow axis at the bottom of the graphic (6) (0.075 l/s).
 Water pressure drop. Draw the line (7) from the point where line (6) crosses the black curve to the pressure drop axis. (5.1 kPa).
Air temperature after heater [°C]
Air ow through the heater [m3/h]
Water ow through the water heating coils [l/s]
Water pressure drop [kPa]
External air temperature [°C]
Coil heating capacity [kW]

7
SAFETY REQUIREMENTS
While operating and mounting the unit consider the requirements of the present operation
manual as well as general requirements of all applicable local and national building and electrical
codes and standards.
The unit must be grounded!
Before connecting the unit to power mains make sure that the unit is free of any visible damages
or any other foreign objects inside the casing that can damage the impeller blades.
Mounting, wireworks and connection to power mains only by duly qualied electricians with
valid electric work permit!
Do not operate the unit beyond the specied temperature range or in an aggressive and explosive
medium!
The unit is not rated for use in areas where atmospheric conditions are determined by sea climate
or hot springs or in media where air is deodorized and supplied further to other premises.
Do not!
• Do not operate the unit beyond the specied temperature range or in an aggressive
and explosive medium!
• Do not connect clothes dryers or similar equipment to the ventilation system!
• Do not operate the unit in the air and dust mixture medium!
Disconnect the unit from power supply prior to any mounting, servicing, connection
or repair operations with the unit.

8VUT .. WH 
STRUCTURE AND OPERATING LOGIC
The unit has the following operating logic (g. 3):
Warm stale extract air from the room ows through the air ducts to the unit, is puried in the
extract lter and is supplied to the heat exchanger and exhausted outside by exhaust fan. Clean cold
air from outside is moved by supply fans to the unit where from it is directed to the supply lter. Then
cleaned air ows through the heat exchanger and is supplied to the room along air ducts.
Thermal energy of warm extract air is transferred to clean intake fresh air from outside and
warms it up. Heat recovery minimizes thermal energy losses, energy demand and operating costs for
climatization accordingly.
Intake air
Exhaust airSupply air
Extract air
Fig. 3. Unit operating logic
The unit is a framework construction that includes a frame made of sis rigidly xed 25 mm thick
sandwich panels. The three-layer sandwich panels are made of two galvanized sheets, internally lled
with thermal- and sound-insulated layer.
The g. 4 shows the unit design. The unit is equipped with quick-detachable service panels 14 for
scheduled repair and maintenance operations. The panels are specially sealed. The terminal box 15 is
detached to inner side of one of the side walls 13.
The terminal box incorporates a terminal block with the wires from the control block. While
connecting the unit to power mains route the wires though the screwed cable glands. The terminal
box inner side shows a wiring diagram for the unit connection.
The unit basic modication includes:
The remote control panel 9 is connected to the control system inside the unit casing
though the data cable;
Two single-inlet centrifugal fans, a supply 1 and an extract 2 fan with forward curved
blades and maintenance-free motors with external rotor and integrated overheating protection;
Plate counter-ow heat exchanger 3.
One water heater compatible with a threaded pipe G ¾.
Two lters: supply lter 4 with F7 lter class and extract lter 5 with G4 lter class. The
supply lter prevents dirt ingress from outside air to the room and protects the unit inner parts from
soiling. The extract lters protect the unit parts from soiling.
Some condensate may appear during heat recovery. Condensate is collected in the drain pan and
removed from the unit through the drain pipe 6.

9
Fig. 4. Unit design
MOUNTING AND SETUP
Fig. 5. Unit mounting
The unit is suspended to the ceiling on the threaded rod that is xed inside the dowel or may be
rigidly xed on a level surface (g. 5).
a) Suspended unit mounting
b) Unit mounting on a horizontal plane
Antivibration rubber
Washer
Nut
Antivibration rubber
Nut and
counter-nut
Nut
Washer
Nut
Washer
Example
1E
xample 2
1. Supply fan;
2. Extract fan;
3. Plate counter-ow heat
exchanger
4. Supply lter;
5. Extract lter;
6. Drain pipe;
7. Water heater;
8. Bypass;
9. Remote control panel;
10. Control block casing;
11. Condensate drain pan;
12. Data cable;
13. Side walls;
14. Quick-detachable panesl.
15. Terminal box.

10 VUT .. WH 
Mount the unit on a rigid and stable structure. Check the technical parameters and the unit
weight.
Use bolts to suspend the unit to the ceiling. Make sure that the construction has sucient load
capacity to carry the unit weight. Otherwise reinforce an installation place by beams etc. After that x
the bolts. If the construction strength or surface is not rigid enough it can resonate with the unit and
create abnormal noise and vibration.
While mounting the unit provide enough service space and an access door in the ceiling for
inspection and maintenance of the lters, heat exchanger and fans. One access door is required for
each unit.
Make sure that the ambient conditions match the unit operation requirements before starting
any installation works.
The operating temperature for the unit ranges between +1°C and +40°C for dry bulb thermometer
at relative humidity 80%.
If the bolts used for the unit mounting are too short the unit can generate abnormal noise and
resonate with the ceiling.
Use longer bolts with to prevent resonance.
Use longer bolts with to prevent resonance. If the connection point to the spiral seam duct is
supposed to be the source of the abnormal noise, install a exible air duct instead of the exible one.
For the better eect you may use anti-vibration connectors.
Make sure of no foreign objects inside the casing before installation. Preinstall M8 anchor bolt.
Then insert the anchor bolt inside the mount for the xing bracket and x it with nuts and washers.
While mounting the unit provide enough minimum distances for accessing the unit for its
servicing and maintenance. The minimum distance from the unit to the wall is shown in g. 6.
Fig. 6. Minimum distance for accessing the unit
Minimum distance for accessing the unit
Control blocks mounting place

11
Fig. 7. Water heater connection
b) Counterow connection a) Direct ow connection
water inlet
water inlet
water outlet
water outlet
To attain the best performance of the unit while mounting provide a straight 1 m duct section on
both sides of the unit.
If the unit is installed at the air duct inlet or outlet it shall be equipped with a grille with the mesh
width up to 12.5 mm or any other protecting device to prevent free access to the unit fans.
To increase the unit eciency connect the water heating coils counter-ow (g. 7).
All the stated calculations are valid for counter-ow connection of the water heater. The water
heater connected on counter-ow basis has lower capacity but higher frost-resistance.
Mixing unit diagram (not included into delivery set) of the water heater is shown in g. 8.
Fig. 8. Mixing unit diagram
M
12
2
35
6
Mixing unit diagram
1. Water heater
2. Shuto valves
3. Circulation pump
4. Bypass damper
5. Boiler
6. Heat medium regulating valve
7. Non-return valve
8. Coarse lter
Heat medium regulating valve actuator
4
78

12 VUT .. WH 
CONDENSATE DRAINAGE
Connect the condensate drain pipes 1, U-trap 3 (not included into delivery set) and the drainage
system 5 with metal, plastic or rubber pipes 2 and 4.The tubes must be sloped down by min. 3 °. 1 m pipe
must be sloped down by 55 mm. Before starting the unit ll the system with water and check that U-trap
is always lled with water. Make sure that the water drainage is correct. Wrong connection to drainage
system may result in condensate accumulation and outow to the premise .
The condensate drainage system is designed for operation at the ambient temperature above 0 °C.
Do not connect several drain pipes from several air handling units to one U-trap!
Direct condensate outside without connection to drain system is not allowed!
Type А (mm) В (mm)
VUT 300 WH ЕС 140 70
VUT 400 WH ЕС 190 95
VUT 600 WH ЕС 140 70
1. Drain pipe
2. Connecting pipe
3. U-trap
4. Drain pipe
5. Sewage system
Fig. 9. Condensate drainage
irculation pump operation (not included into delivery set).
The circulation pump switches automatically on both in summer or winter mode when the fans
are started or at the beginning of the water coils preheating procedure and switches o as the fans
stop.
In case of water coil freezing danger no matter of the active summer/winter mode, the circulation
pump turns on. After the freezing danger is no longer imminent and after the alarm reset the
circulation pump reverts to the previous operation mode.
Bypass operation.
The heat exchanger is equipped with a temperature sensor to control the bypass damper position
to prevent its freezing. In case of the heat exchanger freezing danger, the bypass damper installed
on the supply side is opened to let supply air ow through the bypass air duct and extract air ow
through the heat exchanger to warm up a frozen surface. After defrosting and exhaust air temperature
increase the bypass air duct is closed and supply air ows again through the heat exchanger.

13
The unit is rated for connection to single-phase ac 230 V / 50 Hz.
Connect the unit to power supply by means of insulated, durable and thermal-resistant cords (cables,
wires) with respective cross section, in any case no less 2.5 mm2.
However, the given section value is tentative. The choice of the required wire section in each case
shall be based on the wire type, its maximum permissible heating temperature, its insulation, length
and installation method.
Use copper wires only.
Connect the unit to power mains through the terminal block in the junction box in compliance with
the wiring diagram, g. 10 and the terminal marking.
Connect all the control and supply cables in compliance with the terminal marking!
Connect the unit to power mains through the external automatic thermal-magnetic circuit
breaker integrated into the xed wiring system. The trip current must be in compliance with current
consumption, refer table 1.
Fig. 10. External wiring diagram
VUT .. VH ЕС
1. The unit comprises P1 only.
2. * - Connection option depending on the control panel type
3. ** - Max. wire length from the unit to the panel is 20 m!
4. *** - Cable length from remote control panel must not exceed 10 m!
Electric shock hazard!
Cadet Mini
Power 230 V AC
Design.Name Type Wire***
Circulation pump
Supply air damper actuator
Extract air damper actuator
Heat medium regualting valve actuator
Contact from re alarm panel
Remote control panel
mm
mm
mm
mm
mm
CONNECTION TO POWER MAINS
Connection of the unit to power mains is allowed by a qualied electrician with a
work permit for the electric units up to 1000 V after detailed study of the present user’s
manual.
The rated electrical parameters of the unit are shown on the rating plate. Any
internal connection modications are not allowed and void warranty.

14 VUT .. WH 
UNIT CONTROL
Fig. 11. Location of the electronic control block
1. Extract lter
2. Heat exchanger
3. Supply lter
4. Electronic control block
5. Water heater
6. Extract fan
General description of the automatic control system.
The unit is equipped with a built-in electronic control and automatic block (refer item 4 on g. 11)
and the remote control panel (g. 14).
The automatic control system has the following functions:
1. Switching the unit ON/OFF;
2. Maintaining set supply temperature by means of actuating the heat medium regulating valve;
3. Water heater freezing protection according to TS1 thermostat installed downstream from the
water heating coils and according to return heat medium sensor;
4. Actuating the heat exchanger bypass damper;
5. Control and monitoring of the external circulation pump;
6. Heat exchanger freezing protection;
7. Control and monitoring of the supply and extract fans;
8. Actuating supply and exhaust air dampers;
9. System shutdown on signal from re ghting system.
Recommended rated current of the circuit breaker is 6.3 A. To connect the unit to power mains
route the power and ground cables through the cable screws gland.
The mounting place of the automatic circuit breaker must ensure a quick access for alarm
switching o if required.

15
Structure and operating logic of automatic control system:
Automatic control system has winter and summer operation modes. The mode is selected
automatically depending on the outside temperature: if the outside temperature is above the set
point (0°C by default) the system operates in summer mode. If the temperature drops below this set
point the system automatically switches to winter mode.
Basic system functions in summer mode:
- maintaining set supply air temperature level by means of controlling the heater regulation
valve;
- closing of the heater regulation valve and external air dampers during the fan shutdown.
Extra system functions in winter mode:
- maintaining the set supply air temperature level by means of controlling the heat medium
regulation valve;
- preheating of the water coils before the fan start-up within the time period set by PLC
( parameter Q-02, factory setting 180 seconds, see table 3 by means of 100% opening the heater
regulation valve to provide full air stream through the heating coils. This function is disabled by
default, the factory setting is OFF. It is activated from the PLC, parameter Q-14, see table 2.
- maintaining set minimum return water temperature level when the fans are turned on.
This level is set from the PLC menu, parameter Q-01 (refer the table 2), the default setting is +20°C.
Both in winter and summer modes, the control system enables freezing protection of the water
coils by the thermostat TS1 installed downstream from the heating coils.
In case of freezing danger the fans are turned o, the external air dampers are closed and the
heat medium regulating is 100% opened to enable full stream of heat medium through the coils. The
circulation pump is started.
The control system has extra option to restart the fans after power failure. This option is activated
and adjusted from the controller menu.

16 VUT .. WH 
The air handling unit is equipped with an electronic control block, g. 11, 12.
Fig. 12. Electronic control unit
X1
TR1
Z1
F1
F2 TE3
F1 - thermal fuse
F2 - thermal fuse
TE3 - return heat medium sensor
TR1 - transformer 230 VAC / 24 VAC
X1 - terminal box for external connections
Z1 - digital controller
TS1 - freezing protection thermostat
TS1
The digital controller is the basic component of the control system, g. 13.
Fig. 13 Digital controller
mini
CADET
Esc
Enter
F2 L2
PowerAlarmFault
L1
F1

17
The controller has the following controls and indicators:
Indicator;
Buttons;
LED-lights.
Indicator − LCD display with illumination. The display shows all the online operating
parameters, temperatures, set points and alarms;
Buttons − 6 buttons on PLC panel designed for the following functions:
Esc − move one level up in a list; exit parameter editing;
Enter − move one level down in a list for function selection; enter edit mode; save edited
set point.
− reduce the set point value; move to the previous parameter in a list;
− increase the set point value; move to the next parameter in a list;
F1, F2 − controller service buttons.
LED lights:
Power − PLC power supply indicator;
Alarm − Alarm in the system;
Fault − PLC alarm;
L1 − not activated;
L2 − not activated;
Selecting the required function:
Select the required function using the buttons and , then press Enter. Press Esc to return
back to the list of functions.
Modifying set value:
Select the required parameter using the buttons and , then press Enter. Use the same buttons
to edit the parameter, i.e. to increase or decrease it . The editing value is blinking. Press Enter to save it.
To exit without changes press Esc. The editable values are enclosed in brackets“ >< “.
The controller engineering parameters (factory settings) are editable only after
entering the engineer password. Other parameters can be edited without entering the
engineering password.
The menu tree description is shown in the table 2. The factory setting column shows the set
parameters supplied as a standard.

18 VUT .. WH 
Menu tree Factory setting Functions and parameters, eects
Online parameters (online pram-s) Online system parameters
Online temperatures (online temper-s) Online temperature sensor reading menu
ТЕ1 Intake air temperature
ТЕ2 Exhaust air temperature
ТЕ3 Return heat medium temperature
ТЕ5 Supply air temperature
ALARMS System alarm codes. Failure (1) or no failure (0)
Е1 Breakdown or short circuit of the intake air temperature sensor. Both
fans are stopped.
Е2 Breakdown or short circuit of the exhaust air temperature sensor. Both
fans are stopped.
Е3 Breakdown or short circuit of the return heat medium sensor. Both
fans are stopped.
Е5 Breakdown or short circuit of the supply air temperature sensor. Both
fans are stopped.
F1
F1 alarm (heat exchanger freezing) appears if exhaust air temperature
remains below R-02 parameter within R-03 time period, refer heat
exchanger adjustments Adjust-Recuper. In case of this alarm the
bypass damper is fully opened and the supply and extract fans keep
operating.
О1 Emergency system shutdown on the signal from re ghting system.
Both fans are stopped.
U1
U1 alarm (water heating coils danger) appears if air temperature
downstream from the water heating coils drops below the minimum
set level +3 ºС.
U2
Alarm U2 (low return heat medium temperature) appears if the return
heat medium temperature drops below the set critical set point Q-04.
In case of any freezing danger alarms both fans are stopped, the
heat medium regulating valve is 100% opened and the circulation
pump turns on. Start-up of the fans at any freezing danger alarms is
disabled. The system can be restarted only after the above alarms are
no longer imminent, i.e. after the temperature of return heat medium
TE3 (for U2 alarm) and the air temperature at outlet from the water
heating coils (for U1 alarm) increases above the set point to prevent
the heating coils freezing.
Table 2

19
U3
Failure U3 (underheating) appears if return heat medium temperature
at the end of the heating cycle in winter mode before the fan start-up
is below the set point, factory setting +40°C. Start-up of the fans is
disabled.
Adjustment
Basic controller adjustment menu. Adjustment editing by
professionals only! Editing by unauthorized unskilled labour may
result in the controller non-serviceability or malfunction. The
adjustment menu is password protected. Password information is for
professional installers and service engineers only.
Passw
The adjustment enter password is 1111 by default. To enter the
password which is displayed as “****”select the rst number with
buttons and and press Enter, then enter the second number
with buttons and then press Enter and so on. After entering the
last number press Enter to get to adjustment menu. The engineering
menu is displayed, (Eng. adjust.)
Adjustment of fans (Adjust-vent) Fan parameter adjustment menu
V-02 40 Supply fan low speed adjustment [%]
V-03 70 Supply fan medium speed adjustment [%]
V-04 100 Supply fan high speed adjustment [%]
V-05 40 Extract fan low speed adjustment [%]
V-06 70 Extract fan medium speed adjustment [%]
V-07 100 Extract fan high speed adjustment [%]
V-08 Enables (yes)
This parameter enables/disables fan start-up after power supply
failure. Disable function (no) disables the fan start-up after the power
supply failure and enable function (yes) enables the fan start-up after
the power supply failure;
Pump adjustment (Adjust-pump) Adjustment menu for circulation pump of the water heater.
H-01 20 Minimum operating time of the circulation pump [s].
H-02 Enabled (yes)
This parameter enables/disables the circulation pump operation in
summer mode. Disable function (no) disables the pump start-up in
summer mode and enable function (yes) enables the pump start-up
when the heat medium regulating valve is activated.

20 VUT .. WH 
Additional adjustments Additional controller adjustment menu
Date/time Day and time in adjustment menu
Date Date adjustment menu
Тime Time adjustment menu
Correct time 0
PLC timer correction factor per month. If the PLC timer is too fast
or too low, adjust the timer respectively by means of adjusting the
miscoordination time per month. Set the coecient in seconds
with minus mark if the controller timer is too fast or plus mark if the
controller timer is too slow.
Change
password 2222
Use this function to edit the engineering password. To change the
password (which is shown as “****”) select the rst number with
buttons and and press Enter, then enter the second number
with buttons and , then press Enter and so on. To return to the
previous digit entry press Esc. After entering the last number the PLC
saves the new password. From now on every time when you enter
the engineering menu enter the new password. Note: In case of PLC
adjustments reset (refer Eng. Adjust., reset) the engineering password
is set as 2222.
Light Auto
PLC lighting mode. The LCD display illumination is o after some time
period provided that no button were pressed (“Auto” mode) or is on
all the time (“ON”mode).
Adjustment interface Interface parameter
Protocol UNIV. Communications protocol. ModBus or UNIV value is available.
Speed 38,4 Data transfer speed
Devices 126 The number of devices in the network
Number 4 PLC number in the interface network.
Engineering menu
(Engineering adjustment). Engineering menu contains engineering adjustments protected by
the engineering password (2222 by default).