VAN DER ENDE Airmix G User manual

Airmix model G
Installation Manual
Version: 1.4
Date: July 2020

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
IBAN NL71 RABO 0340341610 · KvK Den Haag 27230471 · Btw-nummer NL8000.78.378.B01 · [email protected] · www.vanderendegroep.nl
Page 2 of 27
Foreword
This user manual is intended for users of the Airmix™ model G and for technicians who install and
maintain it. The user instructions and operating instructions are combined in a single document. The
manual was produced by the inventor, Van der Ende Group (hereafter referred to as VDEG).
Each chapter is numbered and, where necessary, divided into sections. The table of contents on page
4 gives an overview of the chapters and sections, with references to the page numbers.

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
IBAN NL71 RABO 0340341610 · KvK Den Haag 27230471 · Btw-nummer NL8000.78.378.B01 · [email protected] · www.vanderendegroep.nl
Page 3 of 27
Contents
Foreword ...................................................................................................................................... 2
Contents ....................................................................................................................................... 3
1 Identification.............................................................................................................................. 4
1.1 General................................................................................................................................ 4
1.1.1 Description of the system ............................................................................................... 4
1.1.2 Specifications................................................................................................................. 4
1.1.3 Diagram of the system ................................................................................................... 5
1.2 Users................................................................................................................................... 6
1.3 Use ..................................................................................................................................... 6
1.4 Authorised servicers ............................................................................................................. 6
1.5 Operating environment ......................................................................................................... 6
1.6 Guarantee conditions............................................................................................................ 6
1.7 Relevant directives ............................................................................................................... 6
2 Description................................................................................................................................. 7
2.1 General................................................................................................................................ 7
2.2 Transport and storage .......................................................................................................... 7
3 Safety instructions ...................................................................................................................... 8
4 Installation................................................................................................................................. 8
4.1 Contents of the installation kit............................................................................................... 8
4.2 Suspending the Airmix™model G.........................................................................................10
4.2.1 Installing the attachment profiles and Airmix™model G ..................................................10
4.2.2 Installing the condensate plate and fan ..........................................................................13
4.2.3 Installing the extension .................................................................................................14
4.2.4 Installing the valve position sensor.................................................................................16
4.2.5 Installing the air guide plate ..........................................................................................18
5 Modifying the screen .................................................................................................................19
6 Connecting the fan ....................................................................................................................19
6.1 ECblue fan ..........................................................................................................................19
6.2 Connecting the thermostatic switch (only for the AC variant) .................................................20
7 Operation/using for the first time ...............................................................................................21
7.1 Gear-rack drive ...................................................................................................................21
8 Maintenance .............................................................................................................................22
9 Failures and repairs ...................................................................................................................22
10 Disassembly ............................................................................................................................22
11 Declaration of Conformity.........................................................................................................23
Attachments ................................................................................................................................24
CE declaration for fan................................................................................................................25
CE declaration for gear-rack drive ..............................................................................................26
Note ............................................................................................................................................27

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 4 of 27
1 Identification
This overview contains general information about the device. The purpose of this chapter is to indicate
the limits and overall operation of the device, and the areas in which it is used.
1.1 General
1.1.1 Description of the system
The Airmix™ consists of a fan attached to an aluminium housing, which is open at the top and has
three valves at the rear. The Airmix™ model G needs attachment profile for mounting the Airmix™ at
a truss. The valves are controlled with a gear-rack drive. The Airmix™ has a power cord with a plug
for the fan (only the 50Hz variant) and a power cord for the gear-rack drive. The Airmix™ has no
internal controls.
1.1.2 Specifications
General
Type
Airmix™ model G
Maximum dimensions L x W x H
1270 x 630 x 1005 mm
Total weight
approx. 38 kg
Fan
50Hz AC
60Hz EC
60Hz AC
Power
0.38 kW
0.42 kW
0.24 kW
Voltage
230 V
200-277 V
230 V
Rotational speed
1250 rpm
1470 rpm**
960 rpm
Current
1.7 A
2.1 –1.5 A
1.05 A
Circulation capacity
5800 m3/hour*
5800 m3/hour**
5060 m3/hour*
Ventilation capacity
5200 m3/hour*
5200 m3/hour**
4400 m3/hour*
Dust and water ingress protection
IP54
IP54
IP54
Insulation class
THCL155
THCL155
THCL155
Power cord
5 m cord plus
Type F earthed
plug
None
None
Certification
CE marking,
EAC
CE marking,
EAC, cURus
(E347018 ZB-
155)
CE marking,
EAC, cURus
(E111399 ZA-
155)
Gear-rack drive
Power
1.5 W
Voltage
24 V AC 50/60 Hz 24 V DC
Functional range
AC/DC 19.2 to 28.8 V
Duration
116 sec
Dust and water ingress protection
IP54
Adjustment force
150 N
Power cord
5 m cable 3 x 0.75 mm2, without plug
Certification
CE marking, cULus (E108966)
Airmix™ housing
Material
Aluminium 2/3 mm
Number of valves
3
Table 1 Specifications
* Measured without air guide plate and grille, and depending on pressure difference.
** The EC fan has a nominal rotational speed of 1470 rpm. A rotational speed of 1250 rpm gives a
ventilation capacity of 5200 m3/hour. The installation drawings and calculations are based on this
rotational speed and ventilation capacity as standard. The EC fan is a fan with internal control. The EC
fan is supplied as standard on the basis of factory settings and non-addressed.

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Page 5 of 27
1.1.3 Diagram of the system
Diagram showing the main components, numbered and named.
Figure 1 Schematic diagram of the Airmix™
No.
Name
1
Truss
2
Aluminium attachment profile
3
Airmix™housing
4
Valve
5
End plate
6
Gear-rack drive
7
Cover plate
8
Fan
9
Extension duct (optional)
10
Condensate plate (optional)

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Page 6 of 27
1.2 Users
In principle, the Airmix™ is not operated directly, but only controlled externally by an operator or
user. These users must be at least 18 years old, employed by the company where the Airmix™ is
installed, and designated by the management as competent and authorised to operate the Airmix™.
All those who do not meet the above definition are unauthorised users, and these unauthorised users
may create unsafe situations or risks to themselves or others if they use the Airmix™.
1.3 Use
The Airmix™ is designed to mix warm, humid air from the growing area in a greenhouse with cold,
dry air from above the screen. This circulates air horizontally, and improves the climate distribution in
a greenhouse.
The Airmix™ is not designed to be used for any other purposes than those described above, such as
transferring gases other than low-temperature air (-30°C to +50°C).
1.4 Authorised servicers
The Airmix™ can be serviced by any maintenance company, but VDEG is recommended. Periodic
servicing helps to avoid unnecessary costs or failures, and improves reliability.
1.5 Operating environment
The Airmix™ must be attached to the truss with attachment profiles in a greenhouse. The minimum
environmental temperature is -30°C and the maximum environmental temperature is 50°C.
The fan must be installed out of reach of people without special equipment (such as a stepladder or
aerial platform) and the truss must be strong enough to bear the weight of the fan.
The Airmix™ is not designed for use in any other environment than that described above. The
Airmix™ is not suitable for use in explosive environments.
1.6 Guarantee conditions
The unit is guaranteed for 6 months after first use.
If a claim is made under guarantee, the parts concerned must be presented to the manufacturer for
assessment.
The guarantee is void in the event of one or more of the following:
Improper use
Repeatedly ignoring the manufacturer’s or supplier’s advice
Unauthorised repair, maintenance or use
Use of inappropriate power supply connections
Use of the machine in an unsuitable environment
Intentional damage or modification of the machine
1.7 Relevant directives
The Airmix™ complies with the provisions of the following directives:
Machinery Directive 2006/42/EC
Low Voltage Directive 2006/95/EC
EMC Directive 2004/108/EC
The Airmix™ is classified as a Class I device according to the Low Voltage Directive.

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 7 of 27
2 Description
2.1 General
The purpose of the Airmix™ is to ventilate and dehumidify in an area with a closed screen. The
Airmix™ takes in air from above the screen, and blows it into the growing area below. The system is
actually multifunctional, as it also acts as a horizontal recirculation system. This method of operation
allows ventilation to be controlled, and the screen to be kept closed for longer. The advantage of this
is that it is unnecessary to create a ‘slit’ in the screen when it is cold outside, thereby preventing cold
downdraughts (unwanted air flows and temperature differences).
The Airmix™ is fitted with the same fan as the Enfan. The intake side of this fan is attached to the
aluminium housing. Three valves are mounted in the housing, so the air can be drawn in from both
above and below the screen. When the valves are closed, the Airmix™ draws air from the growing
area, and acts as a horizontal recirculation system. If the valves are open, the air is drawn in from
above the screen. The Airmix™ can be used in combination with all kinds of screen systems.
The valves are controlled by the climate computer, which means that the right mixture of air from
above and below the screen can be obtained. This is controlled on the basis of relative humidity,
absolute humidity and/or temperature.
The Airmix™ can be used where all kinds of vegetable, fruit and ornamental plants are grown.
2.2 Transport and storage
The Airmix™ is delivered to customers in the following separate parts:
Part:
Number in Figure 1
Aluminium attachment profile
2
Airmix™ housing, including valves and gear-rack drive
3, 4 & 6
End plates
5
Cover plates
7
Fan
8
Extension
9
Condensate plate (optional)
10
Attachment bracket for air guide plate (optional)
-
Air guide plate (optional)
-
Valve position sensor
-
Attachment materials
-
Power cord for fan (only for 50Hz AC variant)
-

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 8 of 27
3 Safety instructions
Always make sure that the fan is unplugged at the socket before starting to work on the Airmix™!
This will prevent the fan from starting unexpectedly and/or unintentionally.
Do not connect the fan or the gear-rack drive to the power supply until assembly has been completed
and the system has been installed.
4 Installation
This chapter describes how the Airmix™ must be installed. You must read the entire manual before
starting on the installation.
4.1 Contents of the installation kit
Quantity
Description
Contents
Airmix™ model G
1
Airmix™ model G
-Housing excl. fan, incl. valves and gear-
rack drive
1
Fan
1
Power cord for fan (only for 50Hz
variant)
-5m cord plus Type F earthed plug
1
Attachment materials for attaching fan
to spacer
-8 M10 hexagonal lock nuts
-8 M10 washers
2
Aluminium attachment profile
1
Connection set
-2 end plates
-2 cover plates
-2 plugs ¼’’
-6 M8x16 hexagonal bolts
-6 M8 fender washers
-12 metal screws 4.8x19
-2 M6x12 set screws, hexagon socket
-4 metal screws with tapping point 4.8x13
-1 profile connector
-2 mounting strips
Extension
1
Extension
Customer-specific component. The length of the
extension depends on the height that has to be
bridged
2
Aluminium attachment profile
1
End plate set
-2 end plates
-2 cover plates
-2 plugs ¼’’
-6 M8x16 hexagonal bolts
-6 M8 fender washers
-12 metal screws 4.8x19
-2 M6x12 set screws, hexagon socket
-4 metal screws with tapping point
-1 profile connector
-2 mounting strips
Table 2 Contents of the installation kit

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 9 of 27
Accessories
1
Valve position sensor model G
600/1KΩ incl. attachment materials
1
Condensate drip tray
-1 condensate drip tray
-2 M10x25 hexagonal bolts
-2 M10 hexagonal nuts
-4 M10 washers
Options
..
Air guide plate
-1 air guide plate
-3 M5x16 hexagonal bolts
-6 M5 washers
-3 M5 hexagonal nuts
..
Attachment bracket for air guide plate
-1 attachment bracket
-4 M10x25 hexagonal bolts
-8 M10 washers
-4 hexagonal nuts

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 10 of 27
4.2 Suspending the Airmix™model G
This chapter describes the sequence of steps that must be taken when suspending the Airmix™model
G. You start by installing the aluminium attachment profiles, then the Airmix™housing is placed
between the attachment profiles. The fan and the condensate drip tray are then attached to the
housing. Always install the Airmix™model G in consultation with the screen installation technician.
The minimum equipment required is shown for each step.
4.2.1 Installing the attachment profiles and Airmix™model G
-Choose a suitable location:
ouse the installation diagram that was supplied by VDEG and/or your installation
technician;
omake sure that no objects are in the way;
omake sure that no objects can obstruct the Airmix™inlets and outlet;
othe fan must be installed out of reach of people without special equipment (such as a
stepladder);
ocheck that the truss is in good condition;
ocheck that there is an electrical connection less than 5 metres away;
-make sure you have the proper tools and equipment (enough for each person):
Quantity
Description
1
Battery impact wrench
1
Torx 25 bit (in impact wrench)
1
8mm socket bit (in impact wrench)
1
13mm open-ended wrench or socket wrench
1
16mm open-ended wrench
1
3mm hex key
-make sure that the Airmix™can be installed safely; two people are needed for installation,
with one person at height for each lattice truss;
-what you will need for each Airmix™:
Quantity
Description
Number in
Figures 2, 3 & 4
VDEG item
number
2
End plates
5
55014310
2
Stainless steel plugs ¼’’
20
68032415
5
Stainless steel metal screws with
tapping point 4.8x13
6
56042760
2
Aluminium attachment profiles
2
580201xx
12
Stainless steel self-tapping metal
screws 4.8x19
12
56042760
2
Mounting strips
3
55014320
2
Stainless steel M6x12 set screws,
hexagon socket
4
57023510
2
Aluminium cover plates
7
55014330
1
Airmix model G
8
720052xx
6
Stainless steel M8x16 hexagonal
bolts
10
57005920
6
Stainless steel M8 fender washers
9
57000140
1
Stainless steel profile connector
11
55014340

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Page 11 of 27
-fit a mounting strip (3) with an M6x12 set screw (4) in the groove of the profile (2), the first
M8 tapped hole 210mm from the end of the profile; tighten the set screw; do this for two
profiles. See Figure 2:
Figure 2: Mounting strip
-insert a ¼’’ plug (20) in the end plates;
-attach an end plate (5) to a lattice (1) with two 4.8x13 self-tapping hexagonal screws (6);
-attach a second end plate directly opposite to this on the next lattice with two 4.8x13 self-
tapping hexagonal screws (6). Attach the drip tray in the direction of the attachment profiles,
see figure 3B;
-mount an attachment profile (2) between the two end plates with six 4.8x19 self-tapping
screws (12);
-fit two cover plates, lying on each other (7), in the profile;
-mount a second profile between the two end plates with six 4.8x19 self-tapping screws (12),
semi-tighten the screws, so that there is still some movement for attaching the Airmix™;
-slide the Airmix™housing (8) between the profiles up to the end plate; attach it with six
M8x16 hexagonal bolts (10) and six M8 fender washers (9);
-put the cover plates in position and attach to each other with a 4.8x13 self-tapping hexagonal
screw (6);
-put the profile connector (11) in place, by turning it in the groove of the profiles, under the
overlap of the cover plates.

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Figure 3: Installing the Airmix
Figure 4: Profile connector and cover plates

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4.2.2 Installing the condensate plate and fan
After the Airmix housing has been suspended, the condensate drip tray and the fan can be attached
to it. Depending on the type of fan, it is best to prepare this first; see chapter 6. To attach the fan and
condensate plate correctly, go through the following steps:
-make sure you have the proper tools and equipment:
Quantity
Description
2
17mm open-ended wrench or socket wrench
-make sure that the fan can be installed safely –get help if necessary;
-what you will need for each Airmix:
Quantity
Description
Number in Figure 5
VDEG item
number
1
Fan
15
720034XX
1
Condensate drip tray
16
72005120
12
M10 washers st galvanised
13
56019220
8
M10 lock nuts st galvanised
14
56016220
2
M10 hexagonal nuts st
galvanised
18
56015220
2
M10x25 hexagonal bolts st
galvanised
17
56013230
-installation (see Figure 5);
-attach the fan to the Airmix housing by inserting it over the protruding M10 threads; position
the fan with the cable gland connection facing downward;
-secure the fan to the upper six M10 threads with six M10 washers (13) and six M10 lock nuts
(14);
-attach the condensate plate (16) to the Airmix housing by inserting it over the protruding M10
threads;
-secure the condensate plate to the lower two M10 threads with two M10 washers (13) and
two M10 nuts (not lock nuts) (18);
-secure the condensate plate to the fan with two M10 bolts (17), four M10 washers (13) and
two M10 lock nuts (14).
Figure 5: Installing the fan

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Page 14 of 27
4.2.3 Installing the extension
If the greenhouse has multiple screens, an extension will be required. An extension is fitted to two
attachment profiles in the same way as the Airmix.
-make sure you have the proper tools and equipment:
Quantity
Description
1
Battery impact wrench
1
Torx 25 bit (in impact wrench)
1
8mm socket bit (in impact wrench)
1
13mm open-ended wrench or socket wrench
1
16mm open-ended wrench
1
3mm hex key
-make sure that the extension can be installed safely; two people are needed for installation,
with one person at height for each lattice truss;
-what you will need for each extension for each Airmix:
Quantity
Description
Number in
Figures 2, 3 & 4
VDEG item
number
2
End plates
5
55014310
2
Stainless steel ¼’’ plugs
20
68032415
5
Metal screws with tapping point
4.8x13
6
56042760
2
Aluminium attachment profiles
2
580201xx
12
Stainless steel self-tapping metal
screws 4.8x19
12
56042760
2
Mounting strip
3
55014320
2
Stainless steel M6x12 set screws,
hexagonal socket
4
57023510
2
Aluminium cover plates
7
55014330
1
Extension
19 (Figure 6)
72005150
6
Stainless steel M8x16 hexagonal bolts
10
57005920
6
Stainless steel M8 fender washers
9
57000140
1
Stainless steel profile connector
11
55014340
-for installation, see figures in the chapter “Installing the Airmix model G” and Figure 6;
-fit a mounting strip (3) with an M6x10 set screw (4) in the groove of the profile (2), the first
M8 tapped hole 210mm from the end of the profile; do this for two profiles.
-insert a plug (20) in the end plate; do this for two end plates;
-attach an end plate (5) to a lattice (1) with two 4.8x13 self-tapping hexagonal screws (6);
-attach a second end plate directly opposite to the first end plate on the next lattice with two
4.8x13 self-tapping hexagonal screws (6);
-mount a profile (2) between two end plates with six 4.8x19 self-tapping screws (12);
-fit two cover plates, lying on each other (7), in the profile;
-place the extension (19) on the Airmix housing (see Figure 6);
-mount a second profile between the end plates with six 4.8x19 self-tapping screws;
-attach the extension with six M8x16 bolts (10) and six M8 fender washers (9);
-put the cover plates in position and attach to each other with a 4.8x13 self-tapping hexagonal
screw (6);
-put the profile connector (11) in place, by turning it in the groove of the profiles, under the
overlap of the cover plates.

Van der Ende Groep · Aartsdijkweg 23, 2676 LE, Maasdijk · Tel. [phone]
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Figure 6: Installing the extension

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4.2.4 Installing the valve position sensor
The valves of the Airmix™ must be controlled by a climate computer. A valve position sensor must be
installed on one Airmix™ per section to give feedback on the actual position of the valves to the
climate computer. In practice, a greenhouse might be divided into multiple sections, where each
section has its own climate control. This is why one Airmix™ in each section has to be equipped with a
valve position sensor. The valve position sensor must be mounted before the Airmix™ is suspended.
The valve position sensor must be mounted as follows:
-make sure you have the proper tools and equipment:
Quantity
Description
1
Battery impact wrench
1
5.5mm drill
2
8mm open-ended wrench
2
10mm open-ended wrench
2
13mm open-ended wrench
1
5mm hex key
-make sure that the valve position sensor can be installed safely –get help if necessary;
-what you will need for each valve position sensor:
Quantity
Description
Item number
Number in figure
1
Valve position sensor 60°
11012451
6
1
Attachment bracket
55014350
9
1
Lever
55014360
7
1
Stainless steel M5x20 hexagonal bolt
57005340
3
2
Stainless steel M5 lock nut
57004120
5
4
Stainless steel M5 washer
57001120
4
1
Stainless steel M5x25 internal hexagonal
countersunk bolt
57020215
8
1
Stainless steel M8x35 hexagonal bolt
57005960
10
1
Stainless steel M8 lock nut
57004140
12
4
Stainless steel M8 washer
57001140
11
-installation (see Figure 7 and Figure 8);
odrill two holes with 5.5mm diameter in the Airmix housing (see Figure 7);
omount the valve position sensor by securing two M5 nuts and M5 washers from the
inside of the Airmix (if necessary, temporarily remove the top valve);
oclose the valves / set the valves to horizontal, and keep in place by securing a pivot
point (2);
omount the attachment bracket (9) behind the rail of the actuator (1) with the M8x35
bolt (10), M8 washers (11) and M8 lock nut (12) (replace the M8x30 bolt);
oattach the lever (7) to the end of the spindle of the valve position sensor with the
M5x20 bolt (3), M5 washer (4) and M5 lock nut (9). Make sure that the countersunk
hole points towards the Airmix™ housing.
omount the lever to the attachment bracket with the M5x25 countersunk bolt (8), M5
washers (4) and M5 lock nut (5);
orelease the secured pivot point (2).

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Figure 7: Measurements of holes for valve position sensor
Figure 8: Installing the valve position sensor

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Page 18 of 27
4.2.5 Installing the air guide plate
The air guide plate can be installed in several different positions, and multiple plates can be installed
(maximum 4 plates) to restrict the direction in which the fan blows out air to e.g. downward or
upward. The air guide plate can also be attached to an air outlet grille with ty-raps, so that an
attachment bracket is not required. Examples of installed air guide plates are shown in the figures on
this page. The following attachment materials are required.
Per air guide plate
-1 air guide plate
-3 M5x16 hexagonal bolts
-6 M5 washers
-3 M5 hexagonal nuts
Per attachment bracket
-1 attachment bracket
-4 M10x25 hexagonal bolts
-8 M10 washers
-4 hexagonal nuts
Figure 9 Air direction restricted to downward
Figure 10 Extra air direction restriction to downward
Figure 11 Air direction restricted to upward
Figure 12 Extra air direction restriction to upward

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5 Modifying the screen
The Airmix™ system requires modifications to the screen, since the screen system must be changed
so that the Airmix™ can draw in air from above the screen. This must always be done in consultation
with the screen installation technician.
“Figure 13 Cross-section of screen modification” shows a cross-section of the screen modification
required for Airmix model G in the case of a double-screen system. A turn-down must be made in the
screen at the aluminium attachment profile of the Airmix. This is similar to the turn-down in the
screen at the greenhouse wall. In a situation with a double screen, the lower aluminium screen profile
must be sawn through. It should be noted that extra pulling wires may then need to be fitted. In the
case of a single-screen system, the aluminium profile can remain in one piece.
Figure 13 Cross-section of screen modification
6 Connecting the fan
6.1 ECblue fan
The ECblue fan has a drive with internal control, which needs to be programmed before the first use.
The ECblue fan requires that power supply is permanently present. This fan can be controlled with a
Modbus signal or 0-10V control. A rotational speed of 1250rpm is enough to achieve a ventilation
capacity of 5,200 m3/h. The recommended minimum speed is 830 rpm.
Instructions can be found in the ECblue manual on our website www.vanderendegroep.nl

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Page 20 of 27
6.2 Connecting the thermostatic switch (only for the AC variant)
A thermostatic switch is built in to the winding of every AC fan as standard. When connected, this
switch turns the motor off if the internal temperature rises above 100 °C. The motor gets too hot if
the fan becomes blocked, or similar.
Connecting the fan as shown in Figures 14 and 15 increases its life span. The thermostatic switch is
connected in series with the phase. The red line in Figure 5 is the connection between TB and U1.
The ZN045 thermostatic switch is NOT connected as standard in the factory, so this task must be
carried out by the installation technician.
PLEASE NOTE: This thermostatic switch does not have a hard reset, so when the motor
has cooled sufficiently it will restart. Therefore, always remove the plug from the power
supply at the socket during maintenance!
NB: an external protective device with a hard reset is available on request.
Figure 14 Wiring diagram
Figure 15 Connecting the thermostatic switch