Econet Heating And Cooling Transfer 2007 06 8024 Gb

ECONET ® heating and cooling transfer
Air Handling Units, Planning, Dimensioning

May 2007

ECONET® heating and cooling transfer • Air Handling Units • Planning • Dimensioning GUIDE

Contents

Heating and cooling transfer................................................................................................................3

Dimensioning principles ......................................................................................................................4

Connection of additional energy ........................................................................................................6

Scope of delivery....................................................................................................................................7

Assembly and installation ..................................................................................................................10

Control and electricity installation ....................................................................................................13

Functional description ........................................................................................................................16

Code key................................................................................................................................................18

Fläkt Woods 8024 GB 2007.05 Page 2 Subject to alteration.


ECONET® heating and cooling transfer

The ECONET® concept integrates energy recovery, air
heating and air cooling into one system. By doing that
fewer components are required such as heating/cooling
coils, pumps, valves, piping, insulation etc. The result is
a shorter, more compact air handling unit.
The coils are extremely efficient and the temperature
difference between the liquid and the air is small. This
permits either low temperature energy sources or large
temperature differences to be used for the heating or
cooling energy. Additionally, the heat recovery efficiency
using ECONET® is improved by approximately 10…20%
compared to traditional run around coil.

Function

Heat recovery
The system optimizes the liquid flow in the coils to
produce the best possible heat recovery.
The liquid flow is regulated by the frequency controlled
pump.

Heat recovery + additional heat
The system optimizes the liquid flow in the coils to pro-
duce the best possible heat recovery. Supplementary heat
can be supplied to the circuit, either directly or via a heat
exchanger.

Cooling
The exhaust air coil is disconnected and additional cool-
ing is supplied to the circuit so that the cooling liquid
only circulates through the supply air coil. Additional
cooling is either supplied to the circuit directly or via a
cooling exchanger.

Cooling recovery (example IEC)
Exhaust air is cooled through humidification with
indirect evaporative cooling (Coolmaster). The cooling
power is transferred via the recovery system to the
supply air. The liquid flow is optimized and if necessary
additional cooling can be supplied.



ECONET® dimensioning principles

Dimensioning, heating
For the heating situation, ECONET® either attempts to
utilize low temperature heating water (waste/conden-
sate heat) or large temperature differences for the heat-
ing water (decreased hot water flows)
(235 kW)

Heating mode normal solution, figure1: 23°C
In the heating mode a heating water temperature of
about +27°C is sufficient to heat 8.5 m3/s air from -12°C 18°C
(103 kW)
to +20°C. Supplementary heating is supplied to the 27°C

recovery circuit via an external exchanger. A loss of
approx. 2°C over the exchanger gives us a primary heat-
ing temperature of 29°C meaning that all warm/hot -12°C 20°C
water over 29°C is enough for the ECONET system.

Either the system utilizes low temperature heat as Figure 1.
ECONET® heating mode either with low temperature heating water
waste/condensate heat or a large Δt of the hot water.
or large Δt for heating water.

(151 kW)

Heating mode dry box solution, figure 2:
23°C
The functionality of this solution is the same as above
added with a protection of the supply air filter. The idea
is to divide the supply air coil into 2 coils, one before the 19°C
(60 kW)
24°C
filter and one after the filter. The first coil (pre heater) pre
heats the out door air by min. 3°C Δt. the relative humid-
ity into the filter drops which gives the filter a longer life
time. The pre heater coil is easy to clean with water. 0°C -4°C 20°C

Figure 2.
ECONET® heating mode with dry box solution, protection of supply
air filter.



ECONET® dimensioning principles

For the cooling situation, ECONET® is either used as a
pure cooling coil or combined as a cooling coil and a
cooling recovery function.

In the case of only cooling the supply air coil is used to
cool the air, i.e. in this case the exhaust air coil is idle. A
high return temperature on the cooling water is obtained,
which gives a small cold water flow.

In the case of cooling combined with cooling recovery,
both the supply air coil and the exhaust air coil are acti-
vated.

Cooling mode, figure 3:
In the cooling mode a cold water temperature of about
+10°C is sufficient to cool 8.5 m3/s air from +32°C, 40%
to +15°C. Supplementary cooling is supplied to the cir- ºC
29°C
(233 kW)
cuit via an external exchanger. A loss of approx. 1..1,5°C 10°C
over the exchanger gives us a primary cooling tempera-
ture of 9°C meaning that all cold water under 9°C is
enough for the ECONET® system. The return water to the 32°C, 40% 15°C
cooling system will be high, up to 28°C, which gives us a
huge Δt (19°C ) and very small cold water flows. A con-
Figure 3.
ventional cooling system with the cooling water at +7°C ECONET® Cooling mode.
/+12°C would required a liquid flow of about 11 l/s
compared to 3 l/s for the ECONET® solution (233 kW,
9/28°C).
(47 kW)

Cooling mode combined with cooling
recovery, figure 4: C 24°C
The same operating circumstances as previously, but
additional cooling combined with cooling recovery.
25°C
In the cooling mode combined with cooling recovery the (186 kW)
10°C
power demand from external source (chiller) can be
reduced by approx 47 kW (233 kW -> 186 kW).
A cold water temperature of about +10°C is sufficient 32°C, 40% 15°C
to cool 8.5 m3/s air from +32°C, 40% to +15°C. Supple-
mentary cooling is supplied to the circuit via an external
exchanger. A loss of approx. 1..1,5°C over the exchanger Figure 4.
ECONET® Cooling mode combined with cooling recovery.
gives us a primary cooling temperature of 9°C meaning
that all cold water under 9°C is enough for the ECONET®
system. The return water to the cooling system will be
high, up to 24°C, which gives us a huge Δt (15°C ) and
very small cold water flows.



ECONET connection of additional energy

The ECONET® system consists of one supply and one
exhaust air coil as well as a transfer circuit to which the
SV 30 (heating)
heating and cooling energy systems are connected.
Antifreeze is used in the ECONET® circuit and is usually
of the type 25 ...35 % water/ethylene glycol mixture.
SV 50 (cooling)

Usually the energy recovery circuit has to be separated
from the additional heating and/or cooling circuits by a
Figure 5.
heat exchanger for additional heating and/or a cooling
Principle of separate exchangers for additional heating and cooling.
exchanger for additional cooling. In that way the func-
tionality and responsibilities are clear. The functionality of
the air handling unit is therefore not in the same way
depended on the primary energy circuits, maintenance,
3 3
failure etz.

Dimensioning of the energy exchanger package (addition-
2 2
al heating or/and cooling) can be made and selected as 6

an accessory in FWG selection programs for AHU (Acon).
The program selects suitable energy exchangers, expan-
1 1
sion vessel and nessessary equipment, according to the
delivery, see ﬁgure 6. 4

5
If the energy exchanger package is not ordered from
FWG, the Acon selection program will give You all in data Figure 6.
needed to select the exchanger by Your self. Output data 1. Plate heat exchangers for supplementary heating/cooling
2. Pipes for ECONET® pump unit
from the selection programs will be: additional power
3. Shut-off valves
needed, liquid temperatures in/out and the liquid ﬂow 4. Drain valve, Filling valve
for the secondary circuit. 5. Special designed stand
6. Expansion vessel with a safety valve

If additional heating is divided into two sources, primary Every pipe is market with necessary connection information
heating and waste/condensate heat and additional cool-
ing is connected, three exchanger might be needed

If only additional heating is connected to the ECONET® SV 30a (heating 1)
circuit, only one exchanger is needed.

SV 30b (heating 2)

SV 50 (cooling)

Figure 7.
Principle of 2 separate exchangers for additional heating and 1 for
additional cooling



ECONET® scope of delivery

System overview:

Single pump units or double pump units (1 or 2) illustrat- The sensors and components within the pump units (1)
ed in the figure are delivered separately from the AHU. are mounted and wired to the ECONET® control box.
The pump unit is equipped with a stand for mounting on
a flat floor. For a single pump solution, it can be mounted The ECONET® control box is mounted on the pump unit
on the supply air coil (check dimensions and the layout for and pre-programmed with specific data for the project.
the AHU) or separately from the AHU. For a double
pump solution, the pump unit has to be mounted sepa- The frequency inverter/inverters is/are mounted on the
rately from the AHU. pump unit and wired to the pump/pumps and the
ECONET® control box.
The pipework within the pump units (1 and 2) is protected
against rusting and insulated with Armaflex. The supply air coil and exhaust air coil (15, 16) are mount-
+ ed in the air handling unit.
-

15
1

1. Pump unit
MT
10 2. Single-pump solution
SV
9 40 GT
42 3. Double-pump solution
11 3 4. Controller
6 12
GP 19 20 5. a) Frequency inverter 1
40
b) Frequency inverter 2
MT 2 5b
5a 6. Pressure gauge with contact function
7. Sensor, frost protection
8 21 22 5a 8. Shutoff valve/flow measurement
4 4 9. Control valve
17 18 10. Sensor, ice protection
13
GT 11. Non-return valve
40
GP
41 14 12. Shut-off valve
MT 13. Differential pressure transmitter
MP 14. Sensor, temperature
+
- 15. Exhaust air coil
16. Supply air coil
GT
41 17. Non-return valve
7 16
18. Non-return valve
19. Shut-off valve
20. Shut-off valve
21. Shut-off valve
22. Shut-off valve
MP. Pressure gauge
MT. Thermometer




Heat exchanger: Pump unit:
The ECONET® heat exchangers consist of a finned coil/coils The pump unit consists of a pump/pumps, pipes , valves,
in the supply air unit and one in the exhaust air unit with sensors, frequency inverter/inverters and a controller for
functions for heat/cooling recovery, heating as well as cooling ECONET® energy recovery.
of the supply air. The coils are equipped with drip trays and The pipes in the pump unit are anti rust painted and insu-
connections for air purging and drainage. A droplet elimina- lated with Armaflex. The pump/pumps consists of a base
tor should be chosen if the air velocity through the coil is and a pump head, between which the chamber stack and the
high. The coils are manufactured from copper tube, which is outer sleeve are secured by means of staybolts. The base and
expanded against aluminium fins. The header consists of pump head are made of cast iron, and all other wetted parts
either copper or rust-protected steel. The maximum operating are made of stainless steel, DIN 1.4301. All pumps are
pressure of the coils is 1.5 MPa, and the test pressure is 2 MPa. equipped with a maintenance-free mechanical shaft seal of
Other material for the tubes, fins and the framework can be the cartridge type. Max . operating pressure for the pump is
specified in the Acorn selection program. 16bar / 160 mWC / 1.6 MPa.
Coils with hygiene fins should be specified if cleanability The pump unit is designed to be mounted separately with
of the coils according to standards VD13803 and VD16022 is a stand for mounting on the floor. For a singel pump solution
required. it is possible to connect it directly to the coil connection on the
The supply and exhaust air coils are connected together supply air side (check dimensions and the layout for the
by a liquid circuit with the possibility to connect externally AHU). The pump unit is delivered separately on a pallet.
supplied energy or heating/cooling.
(EURZ-05 ECONET® Exchanger Package, see separate
manual).

EU SIZE L D1 D2 H1 H2 H3 PIPE SIZE
20-41 600/621 760 828 640 1953/1671 1232/962 DN 25-32
42-60 730 910 1011/1008 640 2089/1842 1391/1142 DN 50
62-84 800 960 1053 640 2096 1407 DN 65-80

Left-hand design Right-hand design
5 4

4 5
H3

3 6
H3
H2

2
2 6
1
H2

3 1
H1

Removable legs
max 500 mm

L L

D1 D1

D2 D2

The picture shows size EU:42-60

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




4 5

6 6

1
1

H2
3

2
H1

D L

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

EU SIZE L D H1 H2 PIPE SIZE
20-60 850 887 200 1299 DN 25-50
62-84 1398 2015 269 2795 DN 65-80

Controller for heat recovery, frequency inverter and Necessary components such as pressure and temperature
sensors: sensors for the pump unit are included. Components
within the scope of the delivery are installed, and cables
The liquid flow in the ECONET® circuit is controlled by are routed to the ECONET® controller and the frequency
the frequency inverter/inverters for the pump/pumps inverter. The additional components/sensors needed for
and by an ECONET® controller. The controller is the calculation of energy recovery efficiency are included
equipped with software that optimizes the circulation in the delivery, if specified, but mounting and cabling has
flow in the circuit for each operating condition. The soft- to be done on site (not included in Fläkt Woods delivery).
ware in the controller includes protection and alarm
functions. Packaging
Suitable packaging protects the ECONET® unit during
The controller is LonWorks or Modbus compatible. transport. This is fully environmentally compatible, and
Modbus communication is intrinsic to the controller, and should be taken for central disposal as a secondary raw
the LonWorks card for the controller can be chosen as an material.
accessory. The controller is mounted on the pump unit
and is programmed with input data for the specific pro- Commissioning:
ject. Cables are routed between the controller and the fre- In order to guarantee safe and optional functionality for
quency inverter. ECONET® heat recovery, commissioning of each
ECONET® system shall be carried out by accredited and
The frequency inverter for the pump is mounted on the trained personnel. Commissioning of ECONET® can be
pump unit, and cables are routed to the ECONET® con- ordered and carried out via the Fläkt Woods sales
troller and the pump. organisation, see order code.



ECONET® assembly and installation

– Installation of necessary components for connecting
Unpacking
an external energy source, as set out in the documen-
Inspection of delivered equipment
tation.
– Check for signs of transit damage.
– Check that the product codes on the rating labels – Filling and air purging of system.
conform to your requirement. – Power supply to the ECONET® controller and
– Check the delivered components against the bill of frequency inverter.
material. – Connection between the ECONET® controller and the
– The code for the pump unit (STYZ-74-…) can be controller for the AHU.
found on the ECONET® control box.
– Wiring between the air ﬂow sensor (supply air) and
the ECONET® controller.
Installation instruction:
– Mounting and wiring of the delivered sensors needed
The following must be carried out on site by the
for energy recovery calculation, GT00, GT10, GT20,
plumbing/automation and electrical contractors.
GT30, GT21, air ﬂow sensor (exhaust air).

– Assembly of the pump unit, installation of pipes from – Commissioning of the ECONET® system.
the exhaust air coil and connection to the exhaust air – Controls for AHU, SV 30, SV 50, etz.
and supply air coils.

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

GT
40




Coil installation
– Installation of pipes between the pump unit and the
The coils are installed in the air handling units at the
exhaust air coil
factory.
– Connecting the supply air and exhaust air coil
– Filling of liquid and air purging of the pump before
The coils must be connected as a counter-flow connec-
commissioning
tion. Warm against warm and cold against cold. All con-
– Air purging the system
nections are marked with labels.

If the exchanger package is delivered from Fläkt
If a dry box solution is specified, the supply air coils are
Woods:
divided into two coils, one before and the other after the
supply air filter. The supply air coils must be connected
Mounting and installation of the exchanger package
as a serial connection. First to the main supply air coil
to the ECONET® pump unit, and connection of the
(after the filter) and then as a serial connection to the
external energy sources, including necessary valves,
preheater coil (the coil before the filter).
etc. Please see separate instructions for more specific
installation details.
Director
of the flow
To The ECONET® must be connected to the pipe system so
exhaust
coil that expansion forces or the pipe system’s own weight do
Supply air
not impose a load on the liquid connections.
The liquid connections are provided with signs for the
Preheater Main supply inlet and outlet.
coil air coil

Make sure that all inspection doors can be opened after the piping
are installed. Mounting of the pump unit
The pump unit is equipped with a stand for mounting on
a flat floor. For a single-pump solution, it is possible to
Pipe installation connect the pump unit directly to the supply air coil,
Connection to the pipe system should be carried out by although be aware that in some cases the pump unit
the plumbing contractor. might be in the way of AHU doors or other equipment.
Installation normally includes: For a double-pump solution, the pump unit must be
– Installation of necessary components for connecting mounted separately from the air handling unit.
an external energy source, as set out in the documen-
tation. The necessary components vary depending on
the design of the object. Examples of external
components are:
Expansion vessel
Heat exchanger and valves for supplementary
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




General advice – Mark the system with a label showing the actual flow, type
Failure to observe general advice and installation require- of anti-freeze liquid, and concentration.
ments can lead to the risk of damage. – Check for, and seal any leaks.
– Check that the anti-freeze liquid used has sufficient protec-
Flushing the pipe system: tion against corrosion, anti fouling and biological growth.
– ECONET® pump units are cleaned and flushed at the Follow the instructions of the anti-freeze liquid manufac-
factory. When flushing the remainder of the system, we turer.
recommend that the pump unit is disconnected and that
the P40 pump is not used during flushing. Air purging:
It is extremely important to remove all the To get rid of all air in the system takes time, but is vital for the
flushing/cleaning fluid from the system before filling performance. Use automatic air purge valves combined with
with anti freeze as a chemical reaction can occur between manual air purge valves. Prevent the risk of contamination
the cleaning and anti-freeze liquids. As the coils cannot blocking the sealing and jeopardizing the shut-off function of
be emptied completely, they must not be exposed to the the automatic air purge valve. Install a filter if there is a contin-
cold without anti-freeze. uous 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 sys-
tem pressure is maintained at 1–1.5 bar. Refill the system con-
tinuously 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.
The purging, safety valve and drain connections are This is because the pump will be damaged by the air,
routed to the connection vessel next to the unit. resulting in leakage.
– The coils for supplementary heating/cooling have to be
Filling: installed with separate shut-off valves. The total pressure

– For optimal heat recovery, we recommend an approximate drop for the heat exchangers on the secondary side must

25-35% ethylene glycol mixture. Max mixture for the pump not exceed 40 kPa at the maximum liquid flow for a closed

is a 40% ethylene glycol mixture. The P40 pump should heat recovery circuit. A higher value should be taken into

not be used when filling the system. account when dimensioning the system.

Use a separate filling system, e.g. a separate pump with a The purging, safety valve and drain connections must be

non-return valve for filling the system, e.g. a hand pump. routed to the connection vessel next to the unit.
– Use air purge valves that can handle micro bubbles (type
– Fill until a static pressure of 1-1.5 bar is obtained on the suc- Spirovent or Flamcovent).
tion side of the pump to avoid the risk of pump cavitation. – The vessel must be installed on the suction side of the
– Uses premixed anti-freeze liquid, type ethylene glycol/ pump (between the pump and the plate heat exchangers
water mixture. Prevent exposure to oxygen. When using for supplementary energy) with a volume of at least 5 % of
concentrated ethylene glycol, it must be mixed with dis- the total system volume and with 1.0 bar pre-pressure, 4.5
tilled water. The liquid must be mixed 24 hours in advance, bar opening pressure.
so that the mixture will be free of micro bubbles. When fill- – If the risk of cavitation is present on the suction side of the
ing with premixed liquid from a tanker lorry, ask for a pump, it is advisible to install underpressure air elimina-
flushing certificate. tors.



ECONET® control and electrical installation

Electrical connection and recommended fuses
Both the cabinet and the inverter must be connected via
disconnecting switches.
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
20 0.55 kW 1.44 A
21,22,30 0.7 kW 1.9 A
31 1.1 kW 2.55 A
32,40 1.5 kW 3.15 A
33,41,42,50,51 2.2 kW 4.45 A
44 3.0 kW 6.35 A
52,60,53,62 4.0 kW 8.0 A
71,64,80,73,82 5.5 kW 11.2 A
84 7.5 kW 15.2 A

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.

AHU SIZE PUMP OUTPUT MAX. CURRENT
20,21 2 x 0.55 kW 2 x 1.44 A
22,30,31 2 x 0.7 kW 2 x 1.9 A
32,40,33 2 x 1.1 kW 2 x 2.55 A
41,42,50 2 x 1.5 kW 2 x 3.15 A
51,44,52,60,53,62 2 x 2.2 kW 2 x 4.45 A
71,64,80,73,82 2 x 4 kW 2x8A
84 2 x 5.5 kW 2 x 11.2 A

Table 2 Twin 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.




Control cabinet installation
Connect the power supply cable to 230 VAC terminals
Q01: L1, N, and PE (protective earth).

MAIN
Main supply 230 Volt 50Hz Max 10A L
N
PE

AHU controller signals.
Connect the AHU controller signals to terminals accord-
ing to the illustration below. Note that the B-type alarm
and pump 2 running indication (P40.2.I) are relevant
only in twin-pump versions.

-RC1
Controlsignalground com GO 1
X11:6
0-10VDC 0-10V Signal Y 2
X11:5
Controlsignalground com GO 3
X7:1
Start C NO 4
X7:2
5
X7:3
Cooling C NO 6
X7:4
7
X8:1
Cooling recovery C NO 8
X8:2
Common 9
X5:5
P40.1.I Indication P40.1.I Indication 10
X5:4
P40.1.I
Common 11
X6:2
P40.2.1 Indication P40.2.I Indication 12
X6:1
P40.2.I
Common 13
X5:2
A-type alarm A-type alarm 14
X5:1
A-Larm
Common 15
X6:5
B-type alarm A-type alarm 16
X6:4
B-Larm

In the event that some signals measured or calculated by
the Econet controller are relayed as voltage signals to an
external controller, connect the cable according to the fol-
lowing picture. Three temperature measurements (tmp)
-X1

and one efﬁciency signal (eff) are available for relaying.
70
-RC1

Eff X10:1

BMS tmp X10:2
com
tmp X10:4
BMS tmp X10:5
com




Sensor cable connections
Supply Airflow sensor signal
The supply airflow signal (GF10) must be connected in all Connect the airflow sensor according to the illustration
product versions before commissioning the unit. The below.
signal transducer is part of the air handling unit delivery.

–X1
Air flow sensor, 51
supply air 52

GF10 53

54
Air flow sensor, G 55

exhaust air GO 56

GF20 OUT 57

58

Exhaust Airflow sensor signal Temperature sensor content of delivery and installation
The supply airflow signal (GF20) must be connected in the The temperature sensors are included, and their location is
product version with heat recovery efficiency measure- apparent from the list of components and the flow dia-
ment. The signal transducer is part of the air handling unit gram in the documentation.
delivery. Connect the airflow sensor according to the All temperature sensors are connected in the electrical
illustration above. 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.

–RC1
X11:13
Water temp. at the pump GT40
X11:14

X12:1
Frost building GT41 X12:2

X12:3
Ice building GT42 X12:4

X12:5
Outdoor temp GT00 X12:6

X12:7
Supply air temp.GT10 X12:8

Exhaust air temp X12:9

GT20 X12:10

X12:11
Extract air temp.GT21
X12:12

Heating/cooling X12:13

X12:14
liquid temp GT30



ECONET® functional description

Function
The heat recovery function is controlled by the ECONET® Start of the air handling unit:
control box. The specific functions for the AHU must be When ECONET® receives a start-up signal, the pump P40
controlled by a separate controller (not included in the starts to operate at a constant high speed after 3 minutes.
ECONET® delivery). The functions below describe the inter- After that the pump goes to optimal sequence.
nal heat recovery function for ECONET®. The process and
instrumentation diagram for ECONET® is shown below. Main function:
ECONET® is a part of the sequence to control the supply
Exhaust coil air temperature to its set point.
GT GT
21 20
Main functions of ECONET® control box
Exhaust air (control sequence):
GF
20 • Cooling recovery, On/Off signal
The pump P40 and frequency converter FO40 regulate
SV
40 * GT30 alternatively
on the supply pipe to
the liquid flow to an optimal value for cooling recovery,
the heat exchanger
and by-pass valve SV40 will then close. NOTE. The heat
GT
42 recovery signal must be 0%
GT * • Supplementary cooling, On/Off signal
Supplementary
V1 V2 30
energy The pump P40 and frequency converter FO40 regulate
the liquid flow to the optimal value for supplementary
cooling. SV40 will open. NOTE. The heat recovery
FO
P40.1
FO P40.2 signal must be 0%
40.1 40.2
GT
41
• Heat recovery, 0...100%, 0..10 V signal
GP
41 Twin pump
The pump P40 starts at minimum speed, the valve SV40
GT moves from open to closed, pump P40 goes from mini-
40
mum speed to optimal speed (optimal heat recovery
Supply air
liquid flow).
GT GT • See below for twin-pump function and other support
00 10 GF
Supply coil
10 functions, further down.
ECONET, extended delivery:
Standard/normal: GT40, GT41, GT42, SV40, GP41, GF10, Frost and ice protection
FO40.1, P40.1 • Frost protection: Protection against frost formation on
Double pump: FO40.2, P40.2
the exhaust air coil (air side).
Effi ciency calculation: GT 00, GT10, GT20, GT21, GT30, GF20
The liquid temperature at GT41 is prevented from drop-
ping below the temperaure (approx.-3°C) for frost protec-
Air handling unit not running: tion by regulating the liquid flow with the pump P40 and
When the temperature GT41 is below +16°C, the pump FO40 from optimal liquid flow to an increased liquid flow.
will start to operate at a constant low speed. When the
liquid temperature GT41 is higher than +17°C, the pump
P40 will stop.



ECONET® functional description

• Risk of frost formation: • Energy and Power calculation
When the liquid temperature GT41 falls below the If energy calculation is specified, the ECONET® con-
A alarm value (approx. -10°C), the A-type alarm is troller calculates an estimate of momentary power for
given. – Recovered power
• Ice protection: Protection against ice formation in the – Additional power and
heat exchangers for supplementary heating/cooling – Power to the supply air
(water side). The same momentary powers are accumulated to
The liquid temperature at GT42 is prevented from drop- energy, and the following energy consumption values
ping below the temperature (approx. 6°C) for ice protec- are calculated:
tion by regulating the liquid flow with the pump P40 and – Recovered heating energy
FO40 from optimal liquid flow to an increased liquid flow. – Recovered cooling energy
• Risk of ice formation: – Additional heating energy
When the liquid temperature GT42 falls below the – Additional cooling energy
A alarm value (approx. 2°C), the A-type alarm is given. – Heating energy to supply air
– Cooling energy to supply air
Alarms Calculated power and energy values are shown locally
• A-type alarms: or via the communication interface. The calculated
– Risk of frost formation, GT41 ( - 10°C) values are estimates only and are not calibrated. They
– Risk of ice formation, GT42 (+ 2°C) can be used for general monitoring, but not as the basis
– Pump indication not the same as set value for functions such as invoicing, for example.
(conflict alarm, should run but does not, or should not
run but does) • Efficiency calculation
– Low pressure in ECONET® liquid circuit If necessary, additional measurement sensors (GT00,
– Internal hardware fault (heat recovery, GF10, GT41, GT42) GT10, GT20, GT21) are installed and connected. The
• B-type alarms: ECONET® controller then calculates the heat recovery
– One of the twin pumps has stopped when it should run efficiencies. The following efficiencies are calculated:
– Supply air temperature heat recovery efficiency
Support functions – Exhaust air temperature heat recovery efficiency
• Redundant pumps – Momentary power heat recovery efficiency
The ECONET® product version with redundant pumps Due to measurement inaccuracies and small tempera-
has two pumps (P40.1 and P40.2) and frequency convert- ture differences the calculated efficiency values may
ers (FO40.1 and FO40.2) running in parallel. They are exceed 100%.
started and controlled in parallel. In the event of one of
the pumps failing to run, the other pump continues to • Monitoring
run automatically. Failure of one pump is indicated with Two additional sensors (GF20, GT30) are used for
the B-type alarm. The ECONET® unit continues running diagnosing the operation of the ECONET® unit.
according to control signals with one pump only. – Exhaust airflow sensor: In order to evaluate heat
recovery efficiency, the supply and exhaust flows
must be equal
– Additional heating/cooling liquid temperature:
The temperature level must be high enough to
provide necessary additional heating/cooling.



ECONET® code key

The ECONET® coils' order code is obtained from the Circuit ( FF )
unit selection software. From product selection software

EURT-aa-b-c-d-e-ff-g-h-i Material, coil (g)
1 = Cu/Al
Unit size (aa) 2 = Cu / Cu
20 = EU size 20 3 = Cu / Cu tinned
22 = EU size 22 4 = Cu/Al CP (Corropaint)
30 = EU size. 30 5 = Cu/Al copper header
etc. 7 = Cu/Al hygiene fins
8 = Cu/Cu hygiene fins
Finned heat exchanger (b) 9 = Cu/Al copper header, hygiene fins
2= Supply air, heat exchanger
3= Supply air, heat exchanger with droplet separator, Material, coil frame (h)
plastic 1 = Galvanized steel
5= Exhaust air, heat exchanger 2 = Stainless steel
6= Exhaust air, heat exchanger with droplet separator,
plastic Connection side ( i )
1 = Right
Output variant (c) 2 = Left
1=1
2=2 Commissioning by ECONET® is included in the
3=3 delivery, ordered via Fläkt Woods sales offices, code
4=4 according to
5=5
Commissioning code for ECONET®: SERV-07-1/2
Coil version (d) (b position varies)
1 = Normal face area, casing galvanized steel
3 = Normal face area, casing in stainless or polyester The type of service (b)
coated steel 1 = Commissioning
2 = Max. face area, extension frame in galvanized sheet 2 = Participate at inspection
steel 3 = Rebuilding
5 = Max. face area, extension frame in stainless steel
7 = Max. face area, extension frame in polyester coated
steel

Fin spacing (e)
1 = 2 mm
2 = 2.5 mm
4 = 4 mm
5 = 5 mm



ECONET® code key

The ECONET® pump unit's order code is obtained from Language (j)
the unit selection software. 1= Swedish
2 = German
STYZ-74-bb-c-d-e-f-g-h-i-j-k-l 3 = English
4 = Finnish
Unit size (bb)
20 = EU size 20 Construction version (k)
22 = EU size 22 1 = ECONET II (FX-05 controller)
etc. 2 = ECONET III (Saphir controller)

Pump choice, (c) Connection side of coil (l) 1= Right, standard
1 = Single pump 2 = Left, standard
2 = Double pump 3 = Right, stainless steel
4 = Left, stainless steel
Efﬁciency calculation etz. (d) 5 = None
0= Without 6 = none, stainless steel
1 = Energy calculation
2 = Efﬁciency and energy calculation
The ECONET® exchanger package's order code is
Communication (e) obtained from the unit selection software.
0 = Without
3 = Lon EURZ-05-bb-c-dd-eeee-ff-ggg-h-i
4 = N2
7 = Modbus, RTU
8 = BACnet Unit size (bb)
9 = Web pages 20 = EU size 20
22 = EU size 22 etz.
Electricity connection (f)
6 = Plug & Play Exchanger selection (c)
7 = Standard 1 = Heat exchanger
2 = Cooling exchanger
Rated Voltage and Protection Class (g) 3 = Heat and cooling exchanger
1 = 3 x 400 V IP21
2 = 3 x 400 V IP54 Size of heat exchanger (dd)
Number of plates heat exchanger (eee)
Output variant EURT (h) 2= 2
3=3 Size of cooling exchanger (ff)
4=4 Number of plates cooling exchanger (ggg)
5=5
Type of pipe work (h)
Bracket/Stand (i) 1 = Standard
0 = Without 2 = Stainless steel
1 = With
Construction version (i)
1= version 2006.12


Fläkt Woods Group Brings Air to Life

Fläkt Woods Group provides a full range of products and solutions
for building ventilation, air treatment and industrial air movement.

Head offices

Buildings Air Climate Industry Air Movement
Fläkt Woods AB Fläkt Woods Limited
Kung Hans väg 12 Tufnell Way
SE-192 68 SOLLENTUNA COLCHESTER, CO4 5AR
Sweden United Kingdom
t +46 771 26 26 26 t +(0) 1206 544122
f +46 8 626 73 10 f +(0) 1206 574434

Sales Offi ces available World Wide – See our website for details.

www.flaktwoods.com
Due to a policy of continuous development and improvement the
right is reserved to supply products which may differ from those
illustrated and described in this publication. Certified dimensions
CCJ

will be supplied on request on receipt of order.
ECONET - Heating & Cooling transfer-GB-200705-8024

Econet Heating And Cooling Transfer 2007 06 8024 Gb

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Econet Heating And Cooling Transfer 2007 06 8024 Gb