FläktGroup ECONET EQRZ Standard Installation and Maintenance Manual

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

Integrated pump and energy exchange package.

Separated pump and energy exchange package.

ECONET® STANDARD

EQ STAZ-74, EQRZ-05, EQL STYZ-74, LQRZ-05

INSTALLATION AND MAINTENANCE

Content Page

Liquid-coupled heat exchanger ECONET® Standard

Safety rules, warning 2

Introduction 3

Scope of delivery 3

Assembly and installation 9

Control and electrical installation 14

Maintenance instructions 18

Functional description 19

Start and stop sequence at cold climate 21

Start and stop sequence at cold climate 22

Controller operation 23

Menu structure overview 24

ECONET® parameters 25

ECONET® communication 27

Accessible net work variable list 33

BACnet 35

Control unit 40

Basic configuration 41

Spare part list 42

Product code 47

Installation and maintenance

2

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

SAFETY RULES, WARNINGS

Important: read this information before installing the equipment!

Personnel

Qualified personnel should carry out installation, operation and maintenance of the equipment. A qualified

person is someone who is technically competent and familiar with all safety information and established

safety procedures, with the installation process, and with all the hazards involved.

Warnings

This equipment can endanger life through rotating machinery and electrical shocks. Failure to observe the

following will constitute an ELECTRICAL SHOCK HAZARD. This is a product of the restricted sales distribution

class according to IEC 61800-3. In a domestic environment, this product may cause radio interference,

in which case the user may be required to take adequate measures.

– The equipment contains high-value capacitors, which take time to discharge after removal of

the mains supply.

– Before working on the equipment, ensure isolation of the mains supply. Wait for at least 3 minutes

for the inverter to discharge to safe voltage levels.

– Never perform high-voltage resistance checks on the wiring without first disconnecting

the inverter from the circuit being tested.

Possible risks

Under fault conditions, power loss or other, unintentional operating conditions, the equipment may not

operate as specified. In particular:

– The motor speed may not be controlled

– The direction of rotation of the motor may not be controlled

– The motor may be energised

– Heat recovery liquid is poisonous and harmful and may cause risk of injury if leaking

Environmental requirements for storage, transportation and use

If the ECONET® unit is not being installed immediately, store the unit in a well-ventilated place away from

high temperatures, humidity, dust or metal particles.

Environment Installed, and in use Storage and transportation

Temperature Ambient temperature: 0 °C - +40 °C -25 °C - + 50 °C

Intake air: -40 °C - + 40 °C, intake air

temperature also subject to AHU dimensioning.

Humidity Possible condensation on pipework and on the supply and exhaust air coils.

Water ECONET® equipment achieves min IP21.

Pressure Atmospheric pressure, max altitude 1000 m.

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

Pump unit: STAZ-74, STYZ-74

System overwiew

Single pump units or double pump units (1, 2, 3) illustrated in

the figure are delivered separately from the AHU.

The pump unit is equipped with a stand for mounting on

a flat floor.

The pipework within the pump units (1, 2, 3) is protected

against rusting and insulated with Armaflex.

The sensors and components within the pump units

(1, 2, 3) are mounted and wired to the ECONET® control box.

The ECONET® control box is mounted on the pump unit

and pre-programmed with specific data for the project.

The frequency inverter/inverters is/are mounted on

the pump unit and wired to the pump/pumps and the

ECONET® control box.

The exhaust air coil and supply air coil (21,22,23,24) are

mounted in the air handling unit.

INTRODUCTION

ECONET® system consists of a pump and equipped with

single or double pump and a energy exchanger package.

For eQ range air handling units, there are 2 options, either

integrated pump unit and exchanger package or separated.

ECONET® system for eQ ECONET® system for eQL

Pump unit with integrated energy

exchanger package (standard)

Separated Pump unit and energy

exchanger package (option)

Separated Pump unit and energy

exchanger package (standard)

GT

41

MT

GT

42

MP

GP

40

+-

+

MT

GP

41

-

GT

40

SV

40

6

2

7

8

9

3

1

10

11

14

15

20

18 19

4

5a

5b

5a

12

13

16 17

21

22

GT

44

1. Pump unit

2. Single-pump solution

3. Double-pump solution

4. Controller

5. a) Frequency inverter 1

b) Frequency inverter 2

6. Pressure gauge with contact function

7. Sensor, frost protection

8. Control valve

9. Sensor, ice protection

10. Differential pressure transmitter

11. Sensor, temperature

12. Shut-off valve

13. Shut-off valve

14. Exhaust air coil

15. Supply air coil

16. Non-return valve

17. Non-return valve

18. Shut-off valve

19. Shut-off valve

20. Shut-off valve

21. Shut-off valve

22. Sensor, heating holding

MP. Pressure gauge

MT. Thermometer

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

Air coils: EQRT and LQRT

The ECONET® coils consist of a set of finned coil in the supply

air unit and in the exhaust air unit with functions for heat/

cooling recovery, heating as well as cooling of the supply air.

The coils are equipped with drip trays and connections for

air purging and drainage. A droplet eliminator should be

chosen if the air velocity through the coil is high. The coils

are manufactured from copper tube, which is expanded

against aluminium fins.

The header consists of either copper or rust-protected steel.

The maximum operating pressure of the coils is 1.5 MPa,

and the test pressure is 2 MPa. Other material for the tubes,

fins and the framework can be specified in the Acon selec-

tion program.

Coils with hygiene fins should be specified if cleanability

of the coils according to standards VDI 3803 and VDI 6022

is required.

The supply and exhaust air coils are connected together

by a liquid circuit with the possibility to connect externally

supplied energy or heating/cooling.

The pump unit consists of a pump/pumps, pipes , valves,

sensors, frequency inverter/inverters and a controller for

ECONET® energy recovery.

The pipes in the pump unit are anti rust painted and insu-

lated with Armaflex. The pump/pumps consists of a base

and a pump head, between which the chamber stack and

the outer sleeve are secured by means of staybolts.

The base and pump head are made of cast iron, and all other

wetted parts are made of stainless steel, DIN 1.4301. All

pumps are equipped with a maintenance-free mechanical

shaft seal of the cartridge type. Max. operating pressure for

the pump is 16 bar/160 mWC/1.6 MPa.

The pump unit is designed to be mounted separately with

a stand for mounting on the floor. The pump unit is delivered

separately on a pallet.

Additional sensors with advanced freezing protection.

A combined temperature and humidity sensor (GT/GH20)

and a temperature sensor (GT21) to be placed resp. in extract

and exhaust air flow. They are delivered loose in the pump

unit control box.

Single pump unit with integrated exchanger package

Picture shows eQ sizes 032-045 (DN:32)

2a = supply air coil:in, 2b = supply air coil:in (ECONET® Premium), 3 = supply air coil:out, 4a = exhaust air coil:in, 5 = exhaust air coil:out

A = primary heating:in, B = primary heating:out, C = primary cooling:in, D = primary cooling:out, E = drain valve, ﬁlling valve, F = air purge

eQ SIZE L D1 D2 H2 PIPE SIZE

005-027 630 1150 1222 2000 DN-25

032-045 630 1150 1222 2000 DN-32

050-090 930 1400 1472 2000 DN-50

2a

2b 4a

A

B

C

D

3

5

D1

D2

H2

L

F

E

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

Double pump unit with integrated energy exchanger package

L

2a

2b 4a

A

B

C

D

3

5

D1

D2

H1

H3

H2

H4

H5

H6

H7*)

E

F

L

2a

2b 4a

A

B

C

D

3

5

D1

D2

H1

H3

H2

H4

H5

H6

H7*)

E

F

Picture shows eQ sizes 032-045 (DN:32)

2a = supply air coil:in, 2b = supply air coil:in (ECONET® Premium), 3 = supply air coil:out, 4a = exhaust air coil:in, 5 = exhaust air coil:out

A = primary heating:in, B = primary heating:out, C = primary cooling:in, D = primary cooling:out, E = drain valve, ﬁlling valve, F = air purge

eQ SIZE L D1 D2 H1 H2 H3 H4 H5 H6 H7*) PIPE SIZE

005-027 625 1210 1282 100 1655 1402 1432 1482 1552 1782 DN-25

032-045 625 1210 1282 100 1655 1402 1432 1482 1552 1782 DN-32

050-090 930 1490 1562 100 1980 1802 1584/1634 1719 1937 2114 DN-50

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

1 = heating/cooling:in, 2 = supply air coil:in, 3 = supply air coil:out, 4a = exhaust air coil:in, 5 = exhaust air coil:out, 6 = heating/cooling:out

The picture shows eQ sizes: 050-090

L

6

15

4a

3

2

L

6

15

4a

3

2

6

15

4a

3

2

L

H5

H4

H3

H2

H1

eQ SIZE L D1 D2 H1 H2 H3 H4 H5 PIPE SIZE

005-027 625 660 770 200 1600 630 680 730 DN 25

032-045 625 660 770 200 1600 630 680 730 DN 32

050-090 930 910 1020 200 1600 850 900 950 DN 50

eQL SIZE L D1 D2 H1 H2 H3 H4 H5 PIPE SIZE

60 930 910 1020 200 1600 850 900 950 DN 50

62-73 1075 960 1070 200 1600 1040 1090 1140 DN 65

82-84 1075 960 1070 200 1600 1040 1090 1140 DN 80

Single pump unit

Double pump unit

1 = heating/cooling:in, 2 = supply air coil:in, 3 = supply air coil:out, 4a = exhaust air coil:in, 5 = exhaust air coil:out, 6 = heating/cooling:out

eQ SIZE L1 L2 D1 D2 H1 H2 H3 H4 H5 A1 A2 A3 PIPE SIZE

005-027 625 850 970 1085 200 1600 940 990 1040 250 175 325 DN 25

032-045 625 850 970 1085 200 1600 940 990 1040 250 175 325 DN 32

050-090 930 1250 1365 200 1600 1250 1300 1350 350 350 500 DN 50

eQL SIZE L1 L2 D1 D2 H1 H2 H3 H4 H5 A1 A2 A3 PIPE SIZE

60 930 1250 1365 200 1600 1250 1300 1350 350 350 500 DN 50

62-73 1075 1660 1775 200 1600 1240 1290 1340 600 250 725 DN 65

82-84 1075 1660 1775 200 1600 1240 1290 1340 600 250 725 DN 80

3

6

1

5

4a

2

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

Exchanger package: EQRZ-05, LQRZ-05

The ECONET® Exchanger Package contsists of one or two plate

heat exchangers for connection to an external heating and/or

cooling system. The Exchanger Package is delivered separately

from the AHU and the ECONET® pump unit or integrated as

standard for eQ range, see page 4 and 5.

The exchangers are made of AISI 316 stainless steel, brazed

with pure copper. The tubes are made of high-pressure steel,

painted with anti-corrosion paint. These are then insulated

with Armaflex.

The typical pressure rating is 31 bar (450 psi), and the typical

temperature rating is 225 °C (437 °F).

The heat exchanger package, the ECONET® pump unit and

the external pipework must not exceed a total pressure drop

of 40 kPa for maximum liquid flow. If the pressure drop is

higher (a long distance between the components), it should

be taken into account when dimensioning the system.

The pipe connections are male pipe threads from DN25 to

DN50. The connections on the primary side against the plate

exchangers are female pipe threads from DN25 to DN50.

For dimensions DN65 and DN80, all connections are assem-

bled flanges.

The opening pressure for the delivered safety valve is 4.0 bar.

All sizes of ECONET® Exchanger Package come with a specially

designed stand for mounting on a flat floor.

The unit is delivered on a separate pallet.

Packaging

During transportation the ECONET® Exchanger protects in a

appropriate package. This is totaly environmentally friendly

and will discarded as secondary raw material.

B

H

D

The picture shows size eQL 82, 84

11

6

2

33

4

5

B

H

D

1. Plate heat exchangers for supplementary

heating/cooling

2. Pipes for ECONET® pump unit

3. Shut-off valves

4. Drain valve, Filling valve

5. Specially designed stand

6. Expansion vessel with a safety valve

Every pipe is marked with the necessary

connection information.

Integrated pump unit and exchanger package:

STAZ-74 + EQRZ-05 and STYZ-74 + LQRZ-05

The pump unit and the exchanger package are also available

as one unit for the eQ range.

eQ or eQL

SIZE bb CONNECTION DN

MAX B

mm

MAX H

mm

MAX D

mm

eQ 005 - 027 25 650 950 400

eQ 030 - 045 32 550 1100 550

eQ 054 - 068 50 710 1150 800

eQ 072 - 090 50 710 1150 875

eQL 60 50 710 1150 875

eQL 62,71 65 750 1250 900

eQL 64, 73, 80 65 750 1250 1050

eQL 82, 84 80 850 1400 1200

Installation and maintenance

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FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® SCOPE OF DELIVERY

Controller for heat recovery, frequency inverter and

sensors

The liquid flow in the ECONET® circuit is controlled by the

frequency inverter/inverters for the pump/pumps and by an

ECONET® controller. The controller is equipped with software

that optimizes the circulation flow in the circuit for each

operating condition. The software in the controller includes

protection and alarm functions.

The controller is Modbus, Backnet or LonWorks compatible.

Modbus communication is intrinsic to the controller, and

the Backnet and LonWorks module for the controller can be

chosen as an accessory. The controller is mounted on the

pump unit and is programmed with input data for the specific

project.

The frequency inverter for the pump is mounted on the

pump unit, and cables are routed to the ECONET® controller

and the pump.

Necessary components such as pressure and temperature

sensors for the pump unit are included.

Components within the scope of the delivery are installed,

and cables are routed to the ECONET® controller and the

frequency inverter. The additional components/sensors

needed for the calculation of energy recovery efficiency

are included in the delivery, if specified, but mounting and

cabling has to be done on site (not included in FläktGroup

delivery).

Packaging

Suitable packaging protects the ECONET® unit during trans-

port. This is fully environmentally compatible, and should be

taken for central disposal as a secondary raw material.

Commissioning

In order to guarantee safe and optional functionality for

ECONET® heat recovery, commissioning of each ECONET®

system shall be carried out by accredited and trained

personnel. Commissioning of ECONET® can be ordered and

carried out via the FläktGroup sales organisation, see

order code.

Installation and maintenance

9

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® ASSEMBLY AND INSTALLATION

Unpacking

Inspection of delivered equipment

– Check for signs of transit damage.

– Check that the product codes on the rating labels conform

to your requirement.

– Check the delivered components against the bill of material.

– The code for the pump unit (STAZ-74, STYZ-74) can be

found on the ECONET® control box.

– The code for the ECONET® Exchanger Package (EQRZ-05,

LQRZ-05) can be found on one of the heat exchangers.

Installation instruction

The following must be carried out on site by the plumbing/

automation and electrical contractors.

– Assembly of pump unit, installation of pipes from the pump

unit to the exhaust air and supply air coils.

– Installation of necessary components for connecting an

external energy source, as set out in the documentation.

– Filling and air purging of system.

– Power supply to the switch in the ECONET® controller.

– Connection between the ECONET® controller and the

controller for the AHU.

– Wiring between the air flow sensor (supply air) and the

ECONET® controller.

– Installation of the piping from the external energy source.

– Equipment and controls for supplementary heating and

cooling (SV30, SV50).

Option

If ECONET® pump unit and exhanger package delivered

separately, then piping between the units is to be completed

(See below connections 6 and 1).

With the advanced freezing protection:

– Mounting and wiring of the frost prevention sensors,

combined humidity and temperature (GT/GH 20) in the

extract air and temperature (GT21) in the exhaust air.

– With energy calculation: Mounting and wiring of the delive-

red sensors needed for energy recovery calculation, GT00,

GT10, GT20, GT30, GT21, air flow sensor (exhaust air).

– Other: Commissioning of the ECONET® system.

– Controls for AHU, SV 30, SV 50, etz.

Installation and maintenance

10

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® ASSEMBLY AND INSTALLATION

= Pipe connection: ECONET®

= Pipe connection: Exchanger package

GT

44

6

1

C

A

D

B

SV50

SV30

3 x 400 V

(EQRZ-05 ECONET® Exchanger Package, see separate manual).

Installation and maintenance

11

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

Coil installation

The coils are installed in the air handling units at the factory.

The coils must be connected as a counter-flow connection.

Warm against warm and cold against cold. All connections

are marked with labels.

If a dry box solution is specified, the supply air coils are

divided into two coils, one before and the other after the

supply air filter. The supply air coils must be connected as

a serial connection. First to the main supply air coil (after

the filter) and then as a serial connection to the preheater

coil (the coil before the filter).

Pipe installation

Connection to the pipe system should be carried out by

the plumbing contractor

Installation normally includes:

– Installation of necessary components for connecting an

external energy source, as set out in the documentation.

The necessary components vary depending on the design

of the object. Examples of external components are:

Heating/cooling

External shut off valves

Connection for filling

Automatic air purging valve combined with

a manual air purging valve

Air purging valves for micro bubbles

Filter

Charging equipment

Water trap

Anti-freeze liquid

– Heat exchanger and valves for supplementary heating/

cooling

– Installation of pipes between the pump unit and the two

exhaust air and supply air coils

– Filling of liquid and air purging of the pump before com-

missioning

– Air purging the system

– Shut of valves for each coil

If the exchanger package is delivered separately from

the pump unit:

Mounting and installation of the exchanger package to

the ECONET® pump unit, and connection of the external

energy sources, including necessary valves, etc.

The connection of the supplementary heating and/or

cooling must be according to the plates mounted on

the ECONET® Exchanger Package and the ECONET®

pump unit.

If the exchanger package is not included, expansion vessel

and pipes drains has to be installed.

ECONET® ASSEMBLY AND INSTALLATION

Preheater

coil

Supply air

Main supply

air coil

Director

of the flow

To

exhaust

coil

Make sure that all inspection doors can be opened after the pipework

is installed.

Installation and maintenance

12

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

These plates indicate:

– Which of the plate heat exchangers are intended for

heating and cooling.

– Inlet and outlet of the exchangers for primary heating

and cooling.

– Pipes for connection to the ECONET® pump unit.

With the pipes installed correctly, the ECONET® Exchanger

needs to be protected from condensation with insulation on

the pipes to/from the primary systems.

The shut-off valves on ECONET® Exchanger Package must

be open when the system is running as normal.

The ECONET® must be connected to the pipe system so

that expansion forces or the pipe system’s own weight do

not impose a load on the liquid connections.

The liquid connections are provided with signs for the

inlet and outlet.

General advice

Failure to observe general advice and installation require-

ments can lead to the risk of damage.

Flushing the pipe system

– ECONET® pump units are cleaned and flushed at the factory.

When flushing the remainder of the system, we recom-

mend that the pump unit is disconnected and that the P40

pump is not used during flushing.

It is extremely important to remove all the flushing/cleaning

fluid from the system before filling with anti freeze as a

chemical reaction can occur between the cleaning and anti-

freeze liquids. As the coils cannot be emptied completely,

they must not be exposed to the cold without anti-freeze.

Filling

– For optimal heat recovery, we recommend a premixed 25-35 %

ethylene glycol mixture. Max mixture for the pump is a 40 %

ethylene glycol mixture. The P40 pump should not be used

when filling the system.

Use a separate filling system, e.g. a separate pump with a

non-return valve for filling the system, e.g. a hand pump.

– Fill until a static pressure of 1-1.5 bar is obtained on the suc-

tion side of the pump to avoid the risk of pump cavitation.

– For filling of the Econet circuit for the pump unit with inte-

grated exchanger package, see position E, on page 4-5 and

for separate exchanger package see position 4 on page 7.

ECONET® ASSEMBLY AND INSTALLATION

NB!

If the ECONET® Energy Exchanger Package

is not integrated in the ECONET®-unit,

the system need an additional safety valve.

NB!

A purging valve must be ﬁtted at the

highest point in the system.

Important!

– Hold the pipe connections steady with

a pipe wrench when tightening external

pipes.

– Use ﬂax (hemp) and paste for sealing

the connections.

– Use sealings suited for anti-freeze liquids,

such as ethylene glycol mixtures.

The purging, safety valve and drain connections are routed

to the connection vessel next to the unit.

Installation and maintenance

13

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® ASSEMBLY AND INSTALLATION

Temperature limits

FläktGroup recommends that the pump unit and all piping

is installed in a dry location with an ambient temperature

of more than +15º C. If this is not possible, take measu-

res to avoid problems with alarms during a cold start-up.

Continiuous operation of the air handling unit is necessary.

Contact FläktGroup support for more information.

Installation examples

Do the installation according to one of the examples below.

If none of these examples are applicable for your application,

contact FläktGroup support before installation to make sure

that correct funtionality is possible.

Height difference limitation

– The recommended maximum piping length is 60 m (based

on 200 Pa/m external piping pressure drop.

– Let an external plumbing contractor set the dimension of the

pipes between the coils and the pump unit. The dimension of

the pipes must be applicable for the maximum liquid flow

and must be sufficient to ensure that the pressure drop does

not exceed 200 Pa/m.

Example 1. The standard pre-pressure of the expansion vessel is 0.5 bar. This can be used if the vertical distance between

the two sections of the air handling unit is maximum 5 m and the pump unit is installed on the ground floor.

AHU 2

AHU 1

H<5m

L<20m Pump unit

AHU 2

AHU 1

Pump unit

H<10m

L<20m

Example 2. The pre-pressure of the expansion vessel must be adjusted to 1.0 bar if the vertical distance between the two sections

of the air handling unit is less than 10 m and the pump unit is installed on the ground floor.

Installation and maintenance

14

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® ASSEMBLY AND INSTALLATION

Example 3. The standard pre-pressure of the expansion vessel is 0.5 bar and the vertical distance between the two sections of the

air handling unit is less than 15 m. The pump unit is installed on the highest level.

AHU 2

AHU 1

Pump unit

H<15m

L<20m

Installation and maintenance

15

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® ASSEMBLY AND INSTALLATION

– Uses premixed anti-freeze liquid, type ethylene glycol/

water mixture. Prevent exposure to oxygen.

When using concentrated ethylene glycol, it must be

mixed with distilled water. The liquid must be mixed

24 hours in advance, so that the mixture will be free of

micro bubbles. When filling with premixed liquid from

a tanker lorry, ask for a flushing certificate.

– Mark the system with a label showing the actual flow,

type of anti-freeze liquid, and concentration.

– Check for, and seal any leaks.

– Check that the anti-freeze liquid used has sufficient

protection against corrosion, anti fouling and biological

growth. Follow the instructions of the anti-freeze liquid

manufacturer.

Air purging

To get rid of all air in the system takes time, but is vital for

the performance. Use automatic air purge valves combined

with manual air purge valves. Prevent the risk of contami-

nation blocking the sealing and jeopardizing the shut-off

function of the automatic air purge valve. Install a filter if there

is a continuous problem with contamination. When the system

is free of all air, make sure that all automatic air

eliminators are OK and all manual valves are closed.

Open and close all valves a couple of times. Close the by-

pass valve and start the ECONET® pump. The pump should be

run manually via the frequency inverter at maximum 30 Hz.

Under no circumstances must the pump be allowed to run

dry, due to the risk of damage to the seals. Purge the air

from the pump with its own purging valve. Make sure that

the system pressure is maintained at 1–1.5 bar. Refill

the system continuously as the pressure decreases.

If the pressure drops below 0.5 bar, there will be an A-type

alarm from the controller.

Miscellaneous

– Under no circumstances may the P40 pump be run dry.

This is because the pump will be damaged by the air,

resulting in leakage.

– The coils for supplementary heating/cooling have to be

installed with separate shut-off valves. The total pressure

drop for the heat exchangers on the secondary side must

not exceed 40 kPa at the maximum liquid flow for a closed

heat recovery circuit. A higher value should be taken into

account when dimensioning the system.

The purging, safety valve and drain connections must be

routed to the connection vessel next to the unit.

– Use air purge valves that can handle micro bubbles (type

Spirovent or Flamcovent).

– The vessel must be installed on the suction side of the

pump (between the pump and the plate heat exchangers

for supplementary energy) with a volume of at least 5 % of

the total system volume and with 0.5 bar pre-pressure,

3.0 bar opening pressure.

When the supply side is separated from the exhaust side

with a height difference, the vessel is recommended to be

installed on the highest point in the circuit.

– If the risk of cavitation is present on the suction side of

the pump, it is advisible to install underpressure air

eliminators.

Installation and maintenance

16

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

Electrical connection and recommended fuses

Only the cabinet must be connected at disconnecting switch.

Main power shall be 3x400 VAC. An electrician shall

dimension the fuses for the pump according to the table

below, and according to the site circumstances.

Recommended minimum fuse for the cabinet is 10 A.

AHU SIZE PUMP OUTPUT MAX. CURRENT

005 0.37 kW 0.96 A

008, 009 0.55 kW 1.44 A

011, 014, 018, 020 0.7 kW 1.9 A

023, 027 1.1 kW 2.55 A

032, 036 1.5 kW 3.15 A

041, 045, 050, 054, 056, 063, 068 2.2 kW 4.45 A

072 3.0 kW 6.35 A

079, 090 4.0 kW 8.0 A

EQL 60, 62 4.0 kW 8.0 A

EQL 64, 71, 73, 80, 82 5.5 kW 11.2 A

EQL 84 7.4 kW 15.2 A

ECONET® CONTROL AND ELECTRICAL INSTALLATION

Table 2. Twin pump max. currents. Pump data due to the size of the Air

Handling Unit. The fuse size depends on site-speciﬁc circumstances

and must be dimensioned by an electrician.

AHU SIZE PUMP OUTPUT MAX. CURRENT

005 2 x 0.37 kW 2 x 0.96 A

008, 009, 011, 014 2 x 0.55 kW 2 x1.44 A

018, 020, 023, 027 2 x 0.7 kW 2 x 1.9 A

032, 036, 041 2 x 1.1 kW 2 x 2.55 A

045, 050, 054, 056 2 x 1.5 kW 2 x 3.15 A

063, 068, 072, 079, 090 2 x 2.2 kW 2 x 4.45 A

EQL 60, 62 2 x 2.2 kW 2 x 4.45 A

EQL 64, 71, 73, 80, 82 2 x 4 kW 2 x 8 A

EQL 84 2 x 5.5 kW 2 x 11.2 A

Warning!

Ensure that all wiring is electrically

insulated and cannot be made “live”

unintentionally by other personnel.

PE

U

V

W

N

T1 T2 T2

Table 1. Single pump max. currents. Pump data due to the size of

the air-handling unit. The fuse size depends on site-speciﬁc circum-

stances and must be dimensioned by an electrician.

Installation and maintenance

17

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® CONTROL AND ELECTRICAL INSTALLATION

Sensor cable connections

Supply Airflow sensor signal

The supply airflow signal (GF10) must be connected in all

product versions before commissioning the unit. The signal

transducer is part of the air handling unit delivery.

Connect the airflow sensor according to the illustrations

below.

Frost prevention sensors (advanced frost protection)

The extract air combined humidity and temperature sensor

(GT/GH 20) and the exhaust air temperature sensor (GT21)

must be connected in all product versions before commis-

sioning the unit. The signal transducer is part of the air hand-

ling unit delivery. Connect the airflow sensor according to

the illustrations below.

Temperature sensor content of delivery and installation

The temperature sensors are included, and their location

is apparent from the list of components and the flow diagram

in the documentation.

Temperature sensors GT40, GT41, GT42 are connected

in the electrical cabinet via terminals. All the air temperature

sensors are without cables. All the sensors should be

fitted in the air duct, approximately 1.5 m from any duct

heaters, to give stable measurement values. GT00, GT10,

GT20, GT21, GT30 are included when heat recovery

measurement is chosen (option).

Main supply 3 x 400 V

L1

L2

L3

N

PE

U/T1

V/T2

W/T3

N

PE

Main supply

Heat recovery signal

A-alarm

Cooling

Pump 1 indication

ECONET® start signal

B-alarm

Cooling recovery

Pump 2 indication

Modbus AHU or BMS

Control signals

Ref

B

A

110

111

112

0-10 V DC

COM/M

91

92

Start

COM

69

70

Start

COM

71

72

Start

COM

73

74

C

NO

1

2

C

NO

3

4

C

NO

81

82

C

NO

83

84

Installation and maintenance

18

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® CONTROL AND ELECTRICAL INSTALLATION

Mandatory sensors ECONET® Standard

Supply air ﬂow sensor GF10

G

0

P OUT

93

94

95

B

M

103

104

G

0

U1

BS

M

97

98

99

101

102

Sensors ECONET®

GT/GH 20, GT21 for advanced frost protection GT00, GT10, GT20, GT21 and GT30 for thermal efficiency measurement.

Heating holding

temperature sensor

Outdoor temperature GT00

Suply air temperature GT10

Add. energy temperature GT30

GT44 out

G

0

OUT

51

52

53

B

M

107

108

B

M

105

106

B

M

101

102

B

M

43

44

0-10 V

M

0-10 V

M

0-10 V

M

85

86

87

88

89

80

1

2

3

49

50

51

52

Humidity sensor GH20

Temperature sensor GT20

Extract

Exhaust temperature sensor GT21

G

0

P OUT

93

94

95

B

M

103

104

G

0

U1

BS

M

97

98

99

101

102

Power

Humidity 0-10V

Temperature

When communication is used between the air handling unit controller and the pump unit (Modbus) or between the air handling unit and the BMS

controller (Modbus, Bacnet or Lon) some or all the sensors data can be transmitted via communication. In that case wiring the sensors to the pump

unit is not required.

Combined humidity and temperature sensor (GT/GH 20).

Siemens QFM 2120.

Liquid ﬂow sensors GP41

G

0

OUT

51

52

53

B

M

107

108

B

M

105

106

B

M

101

102

B

M

43

44

0-10 V

M

0-10 V

M

0-10 V

M

85

86

87

88

89

80

1

2

3

49

50

51

52

B

M

89

90

Installation and maintenance

19

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

ECONET® CONTROL AND ELECTRICAL INSTALLATION

Sensor GT40 for liquid temperature at the pump P40

The sensor is installed at the factory.

Frost protection temperature sensor GT41 and Ice protection

temperature sensor GT42

The sensors have been installed at the factory.

Frost protection sensors GH20, GT20 (advanced frost

protection), (option)

Extract air combined Humidity (GH20) and Temperature (GT20)

sensor. A humidity and temperature sensor are required to

optimize the frost protection. The combined sensor is a part

of ECONET® delivery but it must be installed and connected

according to the illustration on previous pages.

Exhaust air temperature sensor GT21 (advanced frost

protection or energy calculation), (option)

A temperature sensor is required to optimize the frost preven-

tion. It is a part of ECONET® delivery but must be installed and

connected according to the illustration on previous pages.

Note! GT21 should be mounted as close as possible the coldest

part of the exhaust air stream.

Heating holding temperature sensor GT44

Sensor is separately delivered. Installed on site.

It should be used by the AHU/BMS controller to hold the liquid

temperature to avoid freezing or icing alarm in Econet during

the IDLE and START-UP operation.

Following sensors included when heat recovery measurement

is chosen (option).

Outdoor temperature sensor GT00

An outdoor temperature sensor is needed in the product

version with efficiency calculation. The temperature sensor

is a part of the ECONET® delivery, but it must be installed and

connected before commissioning. Connect the temperature

sensor according to the illustration on the previous page.

Supply air temperature sensor GT10

A supply air temperature sensor is required in product ver-

sion with efficiency calculation. The temperature sensor is

a part of the ECONET® delivery, but it must be installed and

connected before commissioning. Connect the temperature

sensor according to the illustration on the previous page.

Extract air temperature sensor GT20

An extract air temperature sensor is required in the product

version with efficiency calculation. The temperature sensor

is a part of the frost prevention optimisation package.

Exhaust air temperature sensor GT21

An exhaust air temperature sensor is required in the product

version with efficiency calculation. The temperature sensor

is a part of the frost prevention optimisation package.

Supply liquid temperature sensor GT30

The temperature sensor for the liquid arriving at the ECONET®

pump group shall be installed either on the primary side of

the heat exchanger or in the incoming pipe to the circuit.

The temperature sensor is included in the scope of the delivery

of ECONET® but is installed and connected prior to commis-

sioning.

Connect the temperature sensor according to the illustration

on the previous page.

Installation and maintenance

20

FläktGroup DC_8750GB 20210520_R4 Specifications are subject to alteration without notice

LIQUID-COUPLED HEAT EXCHANGER ECONET® STANDARD

MAINTENANCE INTRUCTIONS

General maintenance instructions

The ECONET® unit does not require regular maintenance,

other than observing the maintenance instructions provided

by the anti-freeze liquid manufacturer. On the other hand,

we recommend that regular performance checks are carried

out to ensure that the unit operates as it should.

Check and pay special attention to the following:

- abnormal noise and vibrations, if any

- corrosion on piping and brazed pipe joints, if any

- loose pipe clamps, if any

Warning!

Avoid ﬂushing with water near the electrical

connections of the inverter and cabinet,

since water could then seep into them and

may cause a short circuit.

Cleaning the standard ECONET® coils

Even an effective air filter cannot remove all the dust from the

air. The coating of dust on heating surfaces obstructs the air

flow and gives poorer heat transfer. The coils must be kept

clean, which is best performed with one of the following alter-

natives or combinations of these.

1. Blowing clean with compressed air

2. Blowing clean with steam

3. Washing or rinsing with water.

In the case of heating surfaces that

are coated with grease, an appro-

priate detergent should be added.

4. Vacuum cleaning

After cleaning, all the fallen dust

should be removed before starting the fan.

The drip trays for the coils should be cleaned as appropriate.

Also ensure that the water trap is cleaned and filled with water.

Cleanable coils for hygiene applications

All ECONET® coils with hygiene fins are fully cleanable accor-

ding to the standards VDI3803 and VDI6022. This means that

the coil can be cleaned with a high-pressure water system

right through the core. The cleaning nozzle used for coils

with a fin pitch of 2.0-2.5 mm and deeper than six tubes is

THD Power Clean manufactured by TECHNISCHER HYGIENE

DIENST GMBH (E-mail: [email protected], web: www.thd.info).

If the coil is six tubes deep or less, an ordinary nozzle can be

used.

1. Make sure that no sensitive equip-

ment, either inside or outside the

unit, can be harmed by the water.

Be extra careful not to damage

the filter. If the unit has an empty

section (EQTC), use the special drip

plate to protect the rest of the unit.

2. Clean the coil with a high-pressure

cleaner. If the coil is deeper than six tubes, a THD Power

Clean is needed to ensure a full cleanability.

3. Point the nozzle at a 45-degree angle to have a free passage

for the water jet through the coil. Make sure that the water

penetrates the coil.

4. Remove all dirt.

5. Dry all surrounding parts in the unit. heaters, to give stable

measurement values. GT00, GT10, GT20, GT21, GT30 are

included when heat recovery measurement is chosen

(option).

Anti-freeze liquid

Follow the instructions from the anti-freeze liquid manufacturer

regarding controls, maintenance, flushing and intervals for

filling with fresh liquid, etc.

TASK INTERVAL, EACH YEAR

Liquid status Check the freezing point of the frost protection ﬂuid and follow the instructions from the anti-freeze liquid

manufacturer, controls of frost protection/quality, purity, colour, etc.

Check the system pressure and top up with ethylene glycol mixture if necessary.

Check the liquid ow against the balancing report.

Coils Check that the nned surface of the coils are not dirty and clean if necessary.

Water trap Check that water is present in the water trap for the exhaust air and supply air coils.

Air purging Check frequently initially. An annual check is sufﬁcient after the ﬁrst year.

Shut off the pump and wait a couple of hours to make sure that the air bubbles have risen to the highest points in the

system, where the air-valves should be present. Open/close all valves in the system so that all trapped air can be removed.

Valve checking Shut down the system and open/close every valve to make sure it has a smooth operation.

Pump seals Check the seals, and replace them if leakage is excessive.

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FläktGroup ECONET EQRZ Standard Installation and Maintenance Manual

FläktGroup ECONET EQRZ Standard Installation and Maintenance Manual

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