IV Produkt Envistar Flex Series Troubleshooting guide

Operation and maintenance instructions
Translation of the original instructions
Order number :
Objects:
Air Handling Unit
Envistar Flex 060–1540 and Home Concept FTX Flex 060-600
Envistar®Flex

Unit specifications
Size
060 300 740 
100 360 850 
150 400 980 
190 480 1250 
240 600 1540 
Filter, supply air
Coarse-60% (G4) 
ePM10-60% (M5) 
ePM10-75% (M6) 
ePM1-60% (F7) 
ePM1-85% (F8) / ePM1-85% (F9) 
ePM1-70% (C7) 
Black Ridge BR 
Aluminium 
Excl. filter 
Filter, extract air
Coarse-60% (G4) 
ePM10-60% (M5) 
ePM10-75% (M6) 
ePM1-60% (F7) 
ePM1-85% (F8) / ePM1-85% (F9) 
ePM1-70% (C7) 
Aluminium 
Excl. filter 
Unit type
Home Concept Version 
Control equipment
MX 
US 
UC 
MK 
HS 
Unit parts and accessories
Plate heat exchanger EXP 
Counter-flow exchanger EXM 
Recovery rotor EXR 
Run-around coil unit EXL 
Air heater water EMT-VV, ELEV 
ThermoGuard ESET-TV, ELTV 
Air heater electric ESET-EV, ELEE
Eff-var 1  2  3 4  5 
Air cooler water
ESET-VK, ELBC, ESET-DX, ELBD 
Damper ESET-TR, EMT-01,
MIE-IU, EAU, EBE 
Sound attenuator EMT-02, MIE-KL 
Carbon filter section ECF 
Filter bypass ENFT-10 
Cooling unit ECO, ECX 
Reversible heat pump TCH 

Table of Contents
1 Safety precautions
1.1 Lockable safety switch ................................................................................................................ 6
1.2 Inspection doors .............................................................................................................................. 6
1.3 Electrical connection ..................................................................................................................... 6
1.4 Cooling unit/Revresible heat pump .................................................................................... 6
2 General
2.1 Intended use ....................................................................................................................................... 7
2.2 Manufacturer ....................................................................................................................................... 7
2.3 Designations ....................................................................................................................................... 7
2.4 CE marking and EU Declaration of Conformity ......................................................... 8
2.5 Maintenance ........................................................................................................................................ 8
2.6 Handling of refrigerant ................................................................................................................. 9
2.7 Extended warranty ....................................................................................................................... 10
2.8 Spare parts ........................................................................................................................................ 10
2.9 Dismantling and decommissioning ................................................................................. 10
3 Technical description
3.1 Envistar Flex air handling unit .............................................................................................. 11
4 Wiring instructions and fuse protection
4.1 MX – Complete control equipment and
UC – Complete electrical connection to terminal (without DUC). ............. 12
4.2 MK – Fans and heat exchangers electrically connected to terminal ..... 12
4.3 HS, US - Without control and without electrical connection ........................ 13

Table of Contents, cntd
5 Operation
5.1 Hygiene inspection ...................................................................................................................... 17
5.2 Actions in case of standstill .................................................................................................. 17
5.3 Commissioning .............................................................................................................................. 18
6 Maintenance instructions
6.1 Service schedule ........................................................................................................................... 19
6.2 Filter ...................................................................................................................................................... 21
6.3 Rotary heat exchanger (code EXR) .................................................................................. 25
6.4 Plate heat exchanger (code EXP) ...................................................................................... 28
6.5 Run-around coil unit (code EXL) ........................................................................................ 30
6.6 Air heater water (code EMT-VV, MIE-CL/ELEV) ...................................................... 32
6.7 Air heater electric (code ESET-EV, MIE-EL/ELEE) ................................................ 34
6.8 Air cooler water (code ESET-VK, ESET-DX,
MIE-CL/ELBC, MIE-CL/ELBD) ............................................................................................ 35
6.9 Fan unit (code ELFF) .................................................................................................................. 36
6.10 Damper (code EBE, ESET-TR, EMT-01, MIE-IU, EAU) ...................................... 39
6.11 Sound attenuators (code EMT-02, MIE-KL) .............................................................. 40
6.12 Filter bypass (code ENFT-10) ............................................................................................... 41

Page 6
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
1 Safety precautions
Observe warning labels on the unit as well as the following safety precautions:
1.1 Lockable safety switch
WARNING!
High voltage and rotating fan impeller, risk of personal injury.
Working on/servicing the unit –Shut down the unit via the service
switch in the control equipment, then turn the safety switch to the
0 position and lock it.
NB:
The safety switch is not designed for starting/stopping the unit. Always
use the service switch in the control equipment to start and shut down
the unit.
1.2 Inspection doors
WARNING!
Positive pressure inside the unit, risk of personal injury.
Allow the pressure to drop before you open the inspection doors.
WARNING!
Rotating fan impeller, risk of personal injury. Shut down the unit
via the service switch in the control equipment, then turn the
safety switch to the 0 position and lock it. Wait at least 3 minutes
before opening inspection doors.
NB:
The doors in front of moving parts should normally be locked; there are
no safety guards. Before carrying out work, unlock the doors with the key
provided.
1.3 Electrical connection
WARNING!
Rotating fan impeller, risk of personal injury. The unit must not be
energised until all ducts have been connected.
NB:
Wiring of connections and other electrical work may only be carried out
by a qualified electrician or by service personnel recommended by IV
Produkt.
1.4 Cooling unit/Revresible heat pump
WARNING!
Hot surfaces, risk of personal injury. Shut down the unit via the
service switch in the control equipment, then turn the safety
switch to the 0 position and lock it. Wait at least 30 minutes before
opening the compressor inspection doors.

Page 7
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
2 General
2.1 Intended use
The air handling units in the Envistar Flex series are intended for comfort ventila-
tion in buildings.
2.2 Manufacturer
The Envistar air handling units (AHUs) are manufactured by:
IV Produkt AB
Sjöuddevägen 7
SE-350 43 VÄXJÖ
2.3 Designations
Envistar Flex air handling units consist of a number of different block sections.
Each block section is supplied with a model identification label located at the
front.
The model plate shows the order number and the required designations to iden-
tify the block part.
Kodnyckel
Code key
Beteckning
Project name
Ordernummer
Order number
Max. varv
Max. rev.
Tillv. ort
Made in
Tillv. månad
Manuf. month
YYMM
ENF-190-AA-00
Modell
Model Envistar Flex
TA1 FA1 POS 1
1234-567
– –
VÄXJÖ, SWEDEN
Max. temp. °Cr/m
1805
Art. Nr. 19121-1001
Typical model identification label

Page 8
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
2.4 CE marking and EU Declaration of Conformity
The air handling units and any incorporated cooling units are CE marked,
which means that upon delivery they conform to applicable provisions in EU
Machinery Directive 2006/42/EC as well as to other EU Directives applica-
ble to the types of air handling units, e.g. Pressure Equipment Directive PED
2014/68/EU.
As certification confirming that the requirements have been met, we provide
an EU Declaration of Conformity, which is available under Documentation
at ivprodukt.docfactory.com, or under Order Unique Documentation at
docs.ivprodukt.com.
The CE marking applies to units that IV Produkt AB manufactures and
supplies in the form of a unit without additional control equipment. For
the CE marking of IV products to apply, the applicable requirements of
the EU Machinery Directive 2006/42/EC and related directives for control
equipment shall be met when installed for the unit.
0
1
Art. Nr. 19194-0001_01
12 3
180
s
Typical CE label for air handling units
0409
Cooling unit
Order number
Code Key
Model
Name of project
Date of manufacture
PS Max allowable pressure
PT Test pressure
TS Temperature range
Protection level - low
Protection level - high
Refrigerant / Fluid group
GWP
Refrigerant charge Circuit 1
Refrigerant charge Circuit 2
Refrigerant charge Circuit 3
IV Produkt AB
VÄXJÖ, SWEDEN
Contains fluorinated greenhouse gases
covered by the Kyotot protocol.
bar (e)
bar (e)
°C
bar (e)
bar (e)
kg
kg
kg
ton CO2e
ton CO2e
ton CO2e
Typical CE label for cooling units
2.5 Maintenance
Continuous maintenance of this unit can be carried out either by the person
normally in charge of maintaining the building or through a contract with a
well-reputed service company.

Page 9
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
2.6 Handling of refrigerant
The following information summarises the requirements and guidelines for han-
dling the refrigerant used in cooling units. For further information, see the F-gas
Regulations (EU/517/2014) and the Refrigerant Regulations (SFS 2016:1128).
The purpose of the regulations is to contribute to achieving EU goals for reduced
climate impact in accordance with the Kyoto Protocol.
Operator responsibilities
Generally speaking, the unit operator must:
• Minimise and prevent leakage
• Take corrective action to remedy any leakage that arises
• Ensure that the service and repair of the refrigerant circuit is carried out by a
certified refrigeration technician
• Ensure that refrigerant is handled in an environmentally secure manner and
in accordance with national regulations.
By operator, we refer to the European Parliament’s definition: “...the natural or
legal person exercising actual power over the technical functioning of the equip-
ment and systems...”.
The levels for the various actions to be taken for a system are calculated using
carbon dioxide equivalents, CO₂ e(ton). This figure is calculated by multiplying
the refrigerant’s GWP value (Global Warming Potential) by the filling amount in
kilos. GWP for R410a is 2088. A filling amount of 5.0 kg R410a therefore corre-
sponds to
(5.0×2088)/1000 = 10.44 CO₂ e(tons). The unit is marked with refrigerant quan-
tity and carbon dioxide equivalent.
Leakage inspection and registration
The following applies for single-units with 5 CO₂ e(tons) refrigerant content or
more per circuit:
• Leakage inspections must be carried out by a certified refrigeration techni-
cian:
– on installation/commissioning – periodically at least once every 12 months,
i.e. maximum 12 months between inspections
– within one month after any work is performed (e.g. sealing a leak, replacing
a component).
• The operator must record events, such as the volume and type of refrigerant
topped up, refrigerant recovered, results of inspections and work done, per-
son and company who carried out service and maintenance.
If the total refrigerant content is below 5 CO₂ e (tonnes), no periodic leak detec-
tion or record keeping is needed, but the requirement for leak inspection during
installation does apply.
If the total refrigerant content of the ventilation system exceeds 14 CO₂ e(tons),
the result of the inspections (inspection report) must be sent to the regulatory
authorities and be in their possession no later than 31 March of the following
year. For a unit that will contain 14 CO₂e(tons) or more, the intended operator
must inform the supervisory authority of the installation well in advance.

Page 10
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
2.7 Extended warranty
In cases in which the equipment delivered falls under a 5-year warranty, in ac-
cordance with ABM 07 with supplement ABM-V 07 or in accordance with NL 09
with supplement VU13, the IV Produkt Service and Warranty Manual is supplied
with the product.
In order to lay claim to an extended warranty, a complete, documented and
signed IV Produkt Service and Warranty Manual must be presented.
2.8 Spare parts
Spare parts and accessories for this unit are ordered from your nearest IV
Produkt sales representative. When ordering, state the order number and
designation. These are stated on a model type plate, affixed to each component.
There is a separate spare parts list for the unit, refer to Order Unique
Documentation at docs.ivprodukt.com.
2.9 Dismantling and decommissioning
When an air handling unit is to be dismantled, separate instructions must be fol-
lowed, see Air handling unit, dismantling and decommissioning under
Documentation at ivprodukt.docfactory.com.

Page 11
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
3 Technical description
3.1 Envistar Flex air handling unit
The Envistar Flex is manufactured as a modular unit comprising block sections
in various sizes. The versions are named according to the supply air and can be
freely selected: right-hand or left-hand, up or down.
The units are equipped with either a rotary heat exchanger, counter-flow heat
exchanger, plate heat exchanger or run-around coil unit.
The units are also available as single-stacked supply air or extract air units in
sizes 060-600.
The units are usually supplied with integrated control equipment, but can also be
obtained without control equipment.
Cooling units EcoCooler and Cooling heat pump ThermoCooler HP are available
as an option.

Page 12
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
4 Wiring instructions and fuse protection
4.1 MX – Complete control equipment and UC – Complete electrical
connection to terminal (without DUC).
Applies to:
• units supplied prewired with complete, integrated Siemens Climatix control
equipment (code MX).
• units supplied without process unit (DUC) but with sensor and damper ac-
tuator connected electrically to the terminal (code UC). Fans and heat ex-
changers are fused and connected electrically to the terminal. The terminal
connections are positioned at a shared place in the unit. For further con-
nection to an external process unit, we recommend using a multi-conductor
cable.
Safety switch
A safety switch is mounted on the air handling unit.
Wiring diagrams
For wiring diagrams for units with control equipment, see the order-unique wiring
diagram supplied with the unit at docs.ivprodukt.com (Control Diagram).
Unit functions, power supply and fuse protection
For power supply to the unit functions and recommended fuses, refer to Order
Unique Documentation at docs.ivprodukt.com (Technical Data and Control Dia-
gram), or the product program IV Produkt Designer.
Recommended fuse protection refers to fuses with type C characteristics.
4.2 MK – Fans and heat exchangers electrically connected to terminal
For units supplied without control equipment but with fans and heat exchangers
connected electrically to terminals (code MK).
Connections to terminal blocks are located on each unit section.
For wiring instructions and recommended fuses, refer to Order Unique Docu-
mentation at docs.ivprodukt.com (Terminal Connection and Technical Data).
Safety switch
A safety switch must be fitted and wired on each power supply.

Page 13
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
4.3 HS, US - Without control and without electrical connection
• For units without control equipment and without electrical connection (code
HS), a control diagram is available for the heat exchanger at docs.ivprodukt.
com, for other connection instructions, see below.
• For units without control equipment and without electrical connection (code
US), refer to the connection instructions below.
Recommended fuse protection refers to fuses with type C characteristics.
Safety switch
A safety switch must be fitted and wired on each power supply.
Fan, power supply and fuse protection
For separate power supply of each fan, read and note the “Type” from the fan
data plate.
NB: The fans may be different sizes/variants. Read both the supply air and ex-
tract air fan labels.
For the relevant power supply and recommended fuse protection, refer to
docs.ivprodukt.com (Technical Data).
Fläkt /Fan /Puhallin
Wentylator
/Ventilator /Ventilateur
ELFF-063G-PFD2-0400-1-F-D 225 1460
2 x 8,3
3x400
15 97
4,5
50
W2-063GE
A,Static
VSD Integrated
68,4 62 72,59
2 x 4
Q=1/K xp (m³/s)
Type -r/m
kW A
V
Utfrekvens
Out frekvency
Taajuusalue
Czesttot. wyj.
Ausg.frequen
z
Fréq. sort
-Hz
K-faktor
K-factor
K-
Wsp
kerroin
.K
K-faktor
Facteur
Ref.
ErP data
Eff.degr.type
Speed ctrl.
ɳtotal N↔N=
Max. temp. °C
Typical fan data label

Page 14
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
ELFF Ziehl EC
1×230 V 0.50-0.78 kW
fan impeller 025
Size 060
A (D+)
B (D-)
Brun/Brown
GND Vit/White
Blå/Blue
E1 +
+
-
GND -
A (D+)
B (D-)
11
14
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
D1
10 V
Brandfunktion
Fire mode
LARM (Bryter vid larm)
ALARM (Opens when triggered)
Ref.
Vit/White
Brun/Brown
Grå/Grey
Rosa/Pink
Gul/Yellow
Grön/Green
PE
L1
N
Kraftmatning 1×230 V ~ 50 Hz
Power supply 1×230 V ~ 50 Hz
INKOPPLING / WIRING
Ziehl 1×230 V - BD
MX
IVP-styr
IVP Controls
MK
UC
US
Extern styr
External
Controls
Art. Nr. 19151-0430_00
ELFF EBM EC
1×230 V 0.75 kW
fan impeller 028
Size 100
INKOPPLING / WIRING
EBM 1×230 V - P5
Art. Nr. 19151-0400_00
PE
N
L
Kraftmatning 1×230 V ~ 50 Hz
Power supply 1×230 V ~ 50 Hz
MX
IVP-styr
IVP Controls
MK
UC
US
Extern styr
External
controls
RSA
RSB
Gul/ Yellow
GND
Vit/White
Blå/Blue
+
-
+
-
RSA
RSB
NC
COM
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM (Bryter vid larm)
ALARM (Opens when
triggered)
Ref.
Vit/White
Brun/Brown
Brun/Brown
GND
0-10V Grön/Green
Yellow/Green
Vit 1/White 1
Vit 2/
White 2
Blå/Blue
Svart /Black
Kabel 1/Cable 1 Kabel 2/Cable 2
Gul/Grön
Gul/Yellow
Brun/Brown
Brun/Brown
Blå/Blue
Blå/Blue
Vit/White
Vit/White
ELFF EBM EC
3×400 V 1.05 kW
fan impeller 028
Size 100
INKOPPLING / WIRING
EBM 3×400 V - P6
Art. Nr. 19151-0401_00
PE
L1
L2
Kraftmatning 3×400 V ~ 50 Hz
Power supply 3×400 V ~ 50 Hz
MX
IVP-styr
IVP Controls
L3
MK
UC
US
Extern styr
External
controls
RSA
RSB
Gul/Yellow
GND
Vit/White
Blå/Blue
+
-
+
-
RSA
RSB
NC
COM
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM (Bryter vid larm)
ALARM (Opens when
triggered)
Ref.
Vit/White
Brun/Brown
Brun/Brown
GND
0-10V Grön/Green
Yellow/Green
Vit 1/White 1
Vit 2/
White 2
Svart 1/Black 1
Svart 1/Black 1
Svart 1/Black 1
Kabel 1/Cable 1 Kabel 2/Cable 2
Gul/Grön
Gul/Yellow
Brun/Brown
Brun/Brown
Blå/Blue
Blå/Blue
Vit/White
Vit/White
ELFF EBM EC
3×400 V 1.10-5.70 kW
fan impeller 031-056
Size 100-740
INKOPPLING / WIRING
EBM 3×400 V - P8, M3, M5
RSA
RSB
Gul/Yellow
GND
Vit/White
Blå/Blue
+
-
+
-
RSA
RSB
NC
COM
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM (Bryter vid larm)
ALARM (Opens when triggered)
Ref.
Vit/White
Brun/Brown
Brun/Brown
GND
A in 1U
0-10V Grön/Green
PE
L1
L2
Kraftmatning 3×400 V ~ 50 Hz
Power supply 3×400 V ~ 50 Hz
MX
IVP-styr
IVP Controls
L3
MK
UC
US
Extern styr
External
controls
Art. Nr. 19151-0402_00
ELFF DOMEL PFJ1
3×400 V 4.3-6.5 kW
fan impeller 063-071
Size 480-980
INKOPPLING / WIRING
OJ-DV 3×400 V
PE
L1
L2
Kraftmatning 3×400 V ~ 50 Hz
Power supply 3×400 V ~ 50 Hz
Art. Nr. 19151-0480_00
MX
IVP-styr
IVP Controls
L3
MK
UC
US
Extern styr
External
controls
Bus B
GND
Gul/Yellow
GND
Blå/Blue
Brun/Brown
+
-
+
-
Bus A
Bus B
14 NC
15 C
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM (Sluter vid larm)
ALARM (Closes when triggered)
Vit/White
Brun/Brown
Vit/White
Bus A
0-10V
in Grön/Green
GND Ref.
Fans (ELFF)
Read and make a note of the size and power shown on the fan data label; see
example on previous page. Actual connection instructions can be found below.

Page 15
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
ELFF EBM EC dual fans
2 × 3×400 V 1,74-5.7 kW
fan impeller 2 x 045-056
Size 400-980
Art. Nr. 19151-0420_00
RSA
RSB
Gul/Yellow
GND
Vit/White
Blå/Blue
+
-
+
-
RSA
RSB
NC
COM
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM
(Bryter vid larm)
ALARM
(Opens when triggered)
Ref.
Vit/White
Brun/Brown
Brun/Brown
GND
A in 1U
0-10V Grön/Green
PE
L1
L2
Kraftmatning
Power supply
3×400 V ~ 50 Hz
MX
IVP-styr
IVP Controls
L3
MK
UC
US
Extern styr
External
controls
FLÄKT B / FAN B
Gul/Yellow
GND
NC
COM
Ref.
Vit/White
Brun/Brown
A in 1U
0-10V Grön/Green
PE
L1
L2
L3
RSA
RSB
Vit/White
Blå/Blue
Brun/Brown
GND
+
-
RSA
RSB
FLÄKT A / FAN A
INKOPPLING DUBBELFLÄKT / WIRING DOUBLE FAN
2×EBM 3×400 V - M3, M5
ELFF DOMEL PFJ1 dual fans
2 × 3×400 V 4.3-6.5 kW
fan impeller 2 x 063-071
Size 740-1540
Art. Nr. 19151-0490_00
Gul/Yellow
GND
+
-
14 NC
15 C
Styrning 0-10 V =
Control 0-10 V =
RS-485 Modbus
LARM
(Sluter vid larm)
ALARM
(Closes when triggered)
Vit/White
Brun/Brown
Grön/Green
PE
L1
L2
Kraftmatning
Power supply
3×400 V ~ 50 Hz
MX
IVP-styr
IVP Controls
L3
MK
UC
US
Extern styr
External
controls
FLÄKT B / FAN B
GND
Bus A
Bus B +
-
Ref.
Gul/Yellow
GND
14 NC
15 C
Vit/White
Brun/Brown
Grön/Green
PE
L1
L2
L3
Vit/White
Blå/Blue
Brun/Brown
GND
FLÄKT A / FAN A
Bus A
Bus B +
-
Ref.
0-10V
in 0-10V in
Bus B
Bus A
GND
Vit/White
Blå/Blue
Brun/Brown
Bus B
Bus A
GND
INKOPPLING DUBBELFLÄKT / WIRING DOUBLE FAN
2×OJ-DV 3×400 V
ELFF Danfoss PSM1 dual fans
2 × 3×400 V 11-15 kW
fan impeller 2 x 080
Size 1540
Art. Nr. 19151-0058_01
L3
L1
L2
PE
01
02
55
53
18
03
12
ROSA / PINK
GRÅ / GREY
BLÅ / BLUE
VIT / WHITE
FLÄKT / FAN B FLÄKT / FAN A
MATNING /
POWER
SUPPLY
400 V
MATNING /
POWER
SUPPLY
400 V
LARM
(SLUTER
01-03 VID
LARM OCH
SPÄNNINGS-
BORTFALL)
ALARM
(CLOSES 01-03
IN THE EVENT
OF AN ALARM
OR POWER
FAILURE)
CONTROL
0-10 V=
STYRNING
0-10 V=
START /
STOP
VIT / WHITE
BRUN / BROWN BRUN / BROWN
ROSA / PINK
-
GRÅ / GREY
+
GRÖN / GREEN
GUL / YELLOW
L3
L1
L2
PE
01
02
55
53
18
03
12
42
INKOPPLING DUBBELFLÄKT / WIRING DOUBLE FAN
FCM 106 / FC 101
Air heater electric (code ESET-EV, ESET-
EV, ELEE*)
For power supply, refer to Order Unique
Documentation at docs.ivprodukt.com (Technical
Data).
Y
G0
PE
L3
L2
L1
7
8
PE
+
–
1
2
3
4
NC
NO
POWER SUPPLY
CONTROL
0-10 V DC
OPERATION
1×230 V AC
ALARM (CLOSES
BETWEEN 3-4 IN
EVENT OF ALARM)
*With integrated control equipment (code ELEE-xxx-HS)

Page 16
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
Rotary heat exchanger (code EXR)
Size 060-150 EMX-P10
+
–
33
34
36
37
41
42
43
L
N
PE
CONTROL
0-10 V DC
POWER SUPPLY
1×230 V AC
ALARM (CLOSES IN
EVENT OF ALARM)
COOLING RECOVERY
(CLOSED CONTACT
GIVES FULL SPEED)
Size 190-400 EMX-B
+
–
36
35
34
41
42
43
L
N
PE
CONTROL
0-10 V DC
POWER SUPPLY
1×230 V AC
ALARM (CLOSES IN
EVENT OF ALARM)
COOLING RECOVERY
(CLOSED CONTACT
GIVES FULL SPEED)
Size 480-850 EMX-R
+
–
33
34
36
37
41
42
43
L
N
PE
CONTROL
0-10 V DC
POWER SUPPLY
1×230 V AC
ALARM (CLOSES IN
EVENT OF ALARM)
COOLING RECOVERY
(CLOSED CONTACT
GIVES FULL SPEED)
Size 980 IBC
+
w
S
br
1×230 V AC 3×230 V AC
max 370 W
A1 A2 A3 1 2 6 10 123 5 9 11
L N V W U
13 14 15T T
1
M
2 3 4 5
3 ~
Rota-
tion
monitor
Manual
high/low
speed
Input
signal
Run Reset
Alarm relay
max 2 A
250 V AC
Thermal
contact

Page 17
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
5 Operation
5.1 Hygiene inspection
Envistar Flex conforms to guidelines in VDI 6022 Part 1: Hygiene and Hygiene
Inspections of HVAC Systems.
For this to apply, a hygiene inspection of the system must be carried out and the
system must be cleaned thoroughly as needed before start-up.
For units (code MK, US,UC):
NB:
Pressure surges on filters and air ducts must be prevented through the
design of the duct system and the settings/configuration of the control
system (e.g. soft start of fans, open damper when the fans are in opera-
tion).
5.2 Actions in case of standstill
According to guidelines for hygienic design VDI 6022 Part 1:
In case of prolonged standstill in air treatment systems (more than 48 hours),
it should be ensured that no moist areas can be found downstream from the
cooling coils or humidifier.
In order to avoid the accumulation of moisture – turn off the cooling coils and
humidifier in good time and ventilate the air ducts dry (gradual shut-down). Also,
be sure to set up or program the required functions in the building’s automation/
control system for automatic dry blowing of air coolers and downstream
sections.

Page 18
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
5.3 Commissioning
Commissioning of the unit must be carried out by competent personnel in ac-
cordance with the Commissioning Procedure:
• For Envistar Flex, refer to Commissioning Checklist for air handling units at
ivprodukt.docfactory.com.
• For commissioning of the EcoCooler cooling unit (code ECO, ECX), refer to
separate Operation and Maintenance Instructions, as well as EcoCooler,
Commissioning Procedure at docs.ivprodukt.com.
• For commissioning of the ThermoCooler HP cooling unit (code TCH), refer to
separate Operation and Maintenance Instructions, as well as ThermoCooler
HP, Commissioning Procedure at docs.ivprodukt.com.
The commissioning procedure applies to units that are supplied with control
equipment (code MX).
The validity of the product warranty is conditional on the system having been
correctly commissioned. Working on the cooling unit/reversible heat pump dur-
ing the warranty period without the approval of IV Produkt shall render the war-
ranty void.
Prior to commissioning, the contractor must:
NB:
Wiring of connections and other electrical work may only be carried out
by a qualified electrician or by service personnel recommended by IV
Produkt.
1. Connect the unit to the power supply via a lockable safety switch.
2. Connect the heating/cooling coil.
3. Connect all ducts.
WARNING!
Rotating fan impeller. The unit must not be energised until all
ducts have been connected.

Page 19
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
6 Maintenance instructions
6.1 Service schedule
The service schedule comprises actions and service intervals for functional sections that can be part
of the air handling unit. The unit consists of one or more of these functional sections. The relevant
parts are shown in the order document Technical Data.
Make copies of the service schedule for future use before you fill in servicing data for the first time.
For hygiene inspections according to guideline VDI 6022, refer to the separate Checklist for Operation
and Maintenance, Hygiene Inspections at ivprodukt.docfactory.com.
Service year 20.......-....... or unit no. ............................... Service performed * (date and signature)
Functional section Code Recommended ac-
tion (insp.)
Page
ref.
3000 h /
6 mths
6000 h /
12 mths
9000 h /
18 mths
12,000
h /
24 mths
Filter supply air,
extract air ELEF
Check pressure drop
Change filter if nec-
essary
21 signature signature signature signature
Rotary heat
exchanger EXR
Visual inspection
Check press. balance
Check di. pressure
Clean if necessary
25 signature signature signature signature
Counter-flow/
Plate heat ex-
changer
EXM/EXP
Visual inspection
Clean if necessary
Check function
28 signature signature signature signature
Run-around
coil unit EXL
Visual inspection
Check drainage
Clean if necessary
Check function
30 signature signature signature signature
H
O
2
Air heater
water
EMT-VV,
MIE-CL/ELEV,
ESET-TV,
MIE-CL/ELTV
Visual inspection
Clean if necessary
Check function
32 signature signature signature signature
Air heater
electric
ESET-EV,
MIE-CL/ELEE
Visual inspection
Clean if necessary
Check function
34 signature signature signature signature
H
O
/DX
2
Air cooler wa-
ter/DX
ESET-VK,
MIE-CL/ELBC,
MIE-CL/ELBD
Visual inspection
Check drainage
Clean if necessary
Check function
35 signature signature signature signature
Fan unit ENF
Visual inspection
Clean if necessary
Check the air flow
36 signature signature signature signature
Damper EMT-01,
ESET-TR
Visual inspection
Clean if necessary
Check tightness
39 signature signature signature signature
Sound attenu-
ator
EMT-02,
MIE-KL
Visual inspection
Clean if necessary 40 signature signature signature signature
DX
DX
Cooling/heat-
ing pump TCH
Refer to separate Op-
eration and Mainte-
nance Instructions
–
Cooling unit,
EcoCooler
ECO,
ECX
Refer to separate Op-
eration and Mainte-
nance Instructions
–
*Every 3,000th hour in operation or every 6th month depending on which occurs first. More frequent servic-
ing may be required in certain environments.

Page 20
Operation and maintenance instructions
for Envistar Flex
DSEF181201.00.EN
Continuous product development may give rise to specification changes without notice.
Home Concept model
Service year 20.......-....... for unit no. ............................ Service performed * (date and signature)
Functional section Code Recommended action
(insp.)
Page
ref.
3000 h /
6 mths
6000 h /
12 mths
9000 h /
18 mths
12,000 h /
24 mths
date date date date
CCarbon filter in
filter cabinet ELCF Inspection indication Replace if necessary 22 signature signature signature signature
Filter bypass ENFT-10
Visual inspection
Clean if necessary
Check tightness
41 signature signature signature signature
*Every 3,000 hours in operation or every 6 months, depending on which occurs first. More frequent servicing
may be required in certain environments.