Vapac VapaNet Series User manual

These instructions contain operating information and should be left with the unit.
Electrode Boiler Units
LE
Installation & Operation Manual
Edition 3.2.2
(For use with Software version 7.1 & subsequent issues)
Installation in countries covered by EC Directives:
This product meets the requirements of the RoHS Directive 2002/95/EEC
This product will meet the requirements of the Low Voltage Safety Directive 2006/95/ EEC and the EMC
Directive 2004/108/ EEC when installed in accordance with the instructions contained in this manual.
ailure to comply with these instructions may invalidate the manufacturer's warranty or any
certificate/declaration of conformance requested to be supplied with the unit.

2
CONTENTS
Important Installation Points .................................................................................................................... 3
1.0 Installation..................................................................................................................................... 4
1.1 Vapac LE unit dimensions......................................................................................................... 4
1.1.1 LE weights ............................................................................................................................. 8
1.2 Positioning the steam pipes ...................................................................................................... 8
1.2.1 General .................................................................................................................................. 8
1.2.2 Steam Hose Connection........................................................................................................ 8
1.3 Plumbing Considerations. ......................................................................................................... 9
1.4 Electrical Connections............................................................................................................. 10
1.4.1 Important E.M.C. Considerations ....................................................................................... 10
1.4.2 Power Supply Connection ................................................................................................... 11
1.4.2.1 Volt free alarm outputs ........................................................................................................ 11
1.4.2.2 Unit control terminals........................................................................................................... 11
1.4.3 Electrical Connections ......................................................................................................... 12
1.4.4 Cable Entry Provision .......................................................................................................... 12
1.4.5 Vapac Control Circuit Transformer...................................................................................... 12
1.4.6 RDU Connection.................................................................................................................. 12
1.5 Cylinder Electrical demand loads............................................................................................ 14
1.5.1 LExx Units............................................................................................................................ 14
1.5.2 LExxP Units ......................................................................................................................... 17
1.6 Control Circuit Connections .................................................................................................... 19
1.6.1 Control Circuit Wiring........................................................................................................... 19
1.6.2 Proportional Control............................................................................................................. 19
1.6.3 Control Signal Selection ...................................................................................................... 19
1.6.4 On/Off Control ..................................................................................................................... 19
1.6.5 Sensing Head ...................................................................................................................... 20
1.6.6 Security Circuit / E.P.O. Shutdown...................................................................................... 20
1.6.7 Load Shed Option................................................................................................................ 20
1.6.8 Master/Slave System........................................................................................................... 21
2.0 Start-Up / Operation.................................................................................................................... 22
2.0.1 Start-up check list ................................................................................................................ 22
2.0.2 Start-Up Instructions............................................................................................................ 22
2.0.3 Commissioning/Start-Up...................................................................................................... 22
2.0.4 Features of VAPANET Electode Boiler Unit........................................................................ 22
2.1 Service Advice......................................................................................................................... 23
2.1.1 Procedure for cylinder Exchange. ....................................................................................... 23
2.1.2 Typical Cylinder / Electrode Layouts ................................................................................... 23
2.2.1 Feed Valve with Strainer ..................................................................................................... 24
2.2.2 Drain Pump.......................................................................................................................... 24
3.0 Location of Indicators and Controls ............................................................................................ 25
3.1 Positioning of Indicators and controls on Vapac ® Vapanet ® LE Units. ............................... 25
3.2 Initial Set-up ............................................................................................................................ 26
3.3 Normal Run / Standby / Start-up – No User Intervention Required ........................................ 27
3.4 Fault / Service Indications – Requiring Operator Intervention. ............................................... 28
3.4.1 To Postpone the Sevice: ..................................................................................................... 28
3.4.2 To Service the unit:.............................................................................................................. 29
3.5 Fascia Label symbols.............................................................................................................. 30
3.6 Other Options .......................................................................................................................... 30
4.0 Trouble-shooting Check List ....................................................................................................... 31
5.0 Wiring diagram............................................................................................................................ 32
Appendix 1............................................................................................................................................. 43
A Guide to Positioning Steam Pipes:................................................................................................. 43
Appendix 2............................................................................................................................................. 45
A Guide to Positioning Multipipes: ..................................................................................................... 45

3
Important Installation Points
The unit must be installed to comply with national regulations and/or codes of practice. A qualified
electrician must carry this out.
Ensure at least 1000 mm clear front access to the electrical and steam sections.
Do not locate the cabinet where the ambient temperature around the unit could exceed 35º C; or
fall below 5º C e.g., an unventilated roof mounted enclosure – see minimum space / ventilation
requirements page 7. * If below 5º C Frost protection kit required.
Do not locate the cabinet where a ladder is required for service access as this could make
servicing and cylinder service or exchange hazardous.
Make sure steam line(s) have adequate slope (min 12%) for condensate drainage and use
condensate separators if the pipe is lower than the unit.
Provide adequate support to prevent sags developing in flexible steam lines, which can fill with
water and create a "trap".
Do not locate vented drain directly under the cabinet.
Important Electrical Connection Items
Control cabling should be run in screened cables and kept separate from any mains carrying
cables (see page 10).
Before commissioning the unit, check that all electrical (power) connections - including those at
the terminals and contactor are tight.
Check that the transformer primary winding connection is correct for the supply voltage at Vapac
terminals A1 & A2.
The Vapac transformer must not be used to power other equipment.
Do not mount the 'LR' unit close to a source of strong electromagnetic emissions, such as a
variable speed motor drive, Kva transformer, or 'UPS' unit.
A minimum gap of 2 meters must be maintained between the unit and such devices.
Larger output devices may require an increased gap distance, depending on the nature of
screening / filtration measures fitted to the device.
Use a high-limit humidistat to ensure positive interruption of unit operation when over-
humidification is detected (See page 17).
It is important that the control signal connected to terminals 5 & 6 must be referenced to ground at
the control PCB – this can be done by linking either terminal 5 or 6 to terminal 7.
NB if the controller output is referenced to ground, it is important that the “leg” which is
connected to ground at the controller is also connected to ground at the Vapac unit. Grounding
the opposite “leg” will cause damage to the controller and/or the Vapac control PCB.
Important Maintenance Items
Only a qualified electrician should carry out maintenance.
The boiler contains hot water, and must be drained before any maintenance is carried out on the
steam section. This should be done prior to isolating the power, and removing the front access
panel
ESD SENSITIVE DEVICES USED ON PCB. ENSURE ANTI-STATIC PRECAUTIONS ARE TAKEN
WHEN REMOVING OR REPLACING PCB’S.

4
675.0
430.0
6.0265.055.0 6.0
140.0
285.0
74.0444.0
172.0203.0
204.0
70.0
203.0172.0
F
D
120.0
62.0
50.0
1.0 Installation.
Do’s
Do mount the unit as close to the steam distribution
pipe(s) as possible.
Do mount the unit at a height convenient for reading the
display window.
Do ensure adequate side ventilation (min 80 mm).
Do ensure adequate service access to the front of the unit
(min 1000 mm).
Do ensure adequate service access below the unit (min
1000 mm).
Do ensure that the holes in the rear top panel remain
unobstructed to allow a free flow of air see fig 1.
Do use the marking on the side of the carton as a template
to mark the mounting hole positions.
Do remove the cylinder, if necessary, to access the
mounting holes in the back of the steam section.
Do use M6 projecting type wall bolts or equivalent to
mount the unit in position.
Do mount units with RDU’s so that steam pipe discharge is
above head height.
Do leave minimum gap between the top of an RDU and
the ceiling as per table in fig 2.
Don’ts
Don’t mount the unit close to sources of strong electro-
magnetic emissions e.g. variable speed lift motor
drives, kVa transformers etc.
Don’t mount the unit in an unventilated enclosure.
Don’t mount in a position requiring ladder access to the
unit.
Don’t mount the unit behind a false ceiling or other
situation where an unusual malfunction (e.g. water
leak) would cause damage.
Don’t mount the unit in an area which will be hosed down.
Don’t install the unit where the ambient temperature can
exceed 35oC; or fall below 5oC (Unless frost protection
kit fitted).
Don’t mount the unit inside a cold-room or other place
where temperature and humidity conditions can cause
condensation on electrical components.
Don’t mount the unit where the sound of a contactor
opening/closing and water flow in a pipe would be
unacceptable e.g. libraries, private apartments, etc.
Don’t position an RDU to discharge directly over
expensive equipment, desks or stored materials .
1.1 Vapac LE unit dimensions
Cabinet Size 1.
Covering model references:
LE05 – All
LE09 – All
LE18
–
All
Left:
Top view of unit
showing steam outlet
position (35 mm spigot)
Below:
Rear view of unit
showing wall mounting
points.
Right:
View from beneath unit
showing the electrical gland
plate (approx 120mm x
120mm) with an entry hole
(approx 105mm x 90mm)
Left:
View from beneath unit showing:
‘F’ (Feed) 19mm BSP male
connection for connection for
flexible hose provided with unit.
‘D’ (Drain) connection for 35 mm
pipe.
For clearance around the unit for ventilation & access please see page 7

5
186
360
520
810
DF
Steam Outlet 54 mm
Gland Plate
120 X 120
305
330
6 6
55
305
52
90
62
299
73555
165
165
70
For clearance around the unit for ventilation and access and for units with RDU’s see page 7
Cabinet Size 2.
Covering model references:
LE30 – All
LE45 – All
LE55
-
All
Left:
View from beneath unit
showing-
‘F’ (Feed) ¾ “ BSP male
connection for connection
for flexible hose provided
with unit.
‘D’ (Drain) connection for
35 mm pipe.
Right:
View from beneath unit
showing the electrical gland
plate
(approx 120 mm x 120 mm)
with an entry hole
(approx 105 mm x 90 mm)
Left:
Top view of unit showing
steam outlet position
(54 mm spigot)
Below:
Rear view of unit showing
wall mounting points.

6
55 990 360
20.5"(520) 468
31.1"(790)
55
505
176
6
360
6
152
343
343
70 850
62
237
190
610
810
322
346
190
610
73555
F F
D
Steam Outlets
54 mm
Gland Plate
120 X 120
Gland Plate
120 X 120
For clearance around the unit for ventilation and access see page 7
Cabinet Size 4.
Covering model references:
LE60 – All
LE90 – All
LE110 – All
Left:
Top view of unit showing
steam outlet positions
(54 mm spigots)
Below:
Rear view of unit showing
wall mounting points.
Left:
View from beneath unit
showing-
‘F’ (Feed) ¾ “ BSP male
connection for connection
for flexible hose provided
with unit.
‘D’ (Drain) connection for
35 mm pipe.
Right:
View from beneath unit showing
the electrical gland plate
(approx 120 mm x 120 mm)
with an entry hole
(approx 105 mm x 90 mm)

7
Cabinet Sz 1 with RDU
Dimensions
L L
2
1
Cabinet
size 2 with
RDU
Dimensions
RDU 30 kg/h
A = 602mm
B = 205mm
RDU 45 kg/h
A = 842mm
B = 360mm
Clearance around LE Units
Unit L H
min
H1
min
H2
min
LE05 All
(No RDU) 85 1000 500 -
LE05 All
(With RDU) 85 1000 - 200
LE09 All
(No RDU) 85 1000 500 -
LE09 All
(With RDU) 85 1000 - 250
LE18 All
(No RDU) 85 1000 500 -
LE18 All
(With RDU) 85 1000 - 500
LE30 All
(No RDU) 85 1000 500 -
LE30 All
(With RDU) 100 1000 - 750
LE45/LE55
(No RDU) 85 1000 500 -
LE45/55
(With RDU) 200 1000 - 775
LE60 - 110 All (Twin
Cylinder No RDU) 85 1000 500 -
A minimum clear space of 1 m is required in
front of the unit for maintenance access

8
1.1.1 LE weights
The unit dry weight is the delivered unit with no
water in unit, the wet weight is the operational
weight when the unit is running . The RDU
weight must be added to the unit weight if fitted
on top of the Electrode Boiler unit.
Vapanet model Dry Kg Wet Kg RDU
Kg
LE05 and LE05P 23.5 29 6
LE09 and LE09P 24 31 10
LE18 and LE18P 24.5 36 12
LE30 and LE30P 34 62 14
LE45,LE45P & LE55 34 62 16
LE60 and LE60P 52 106 NA
LE90, LE90P & LE110 52 106 NA
1.2 Positioning the steam pipes
1.2.1 General
Steam pipes should be positioned as shown below,
allowing a minimum rate of fall back to the unit of
12% to allow the free flow of condensate back to the
unit. If the above fall is not possible, then
condensate separators must be fitted as shown in
appendix 1.
The position of the steam pipe or multipipe in a air-
conditioning system relative to other items such as
bends, filters, heat exchangers, etc., is critical. The
steam pipe must not be located closer to such item,
than the entrainment distance, and must be decided
by the design engineer responsible for the project.
Do's
Do obtain project engineer's instruction/drawing for
chosen location of pipe
Do obtain project engineer's instruction/drawing for
pipe position relative to the top & bottom of the
duct (or sides if airflow is vertical.
Do check if alternative slope of Ø35mm pipe has
been specified.
Do use bracket/lug on the end of Ø54mm pipes for
extra support.
1.2.2 Steam Hose Connection
Do's
Do use Vapac steam hose or well insulated copper
pipe.
Do keep steam hose as short as possible (under 2m
for max efficiency).
Do arrange to have a vertical rise immediately over
the unit of 300mm.
Do use the full height available between the unit
and steam pipe to provide maximum slope (min
12-20% for condensate to drain back to the
steam cylinder (or down to a condensate
separator). Always provide a continuous slope.
Do provide adequate support to prevent sagging
a) fit pipe clips every 30-50cm
or b) support straight lengths on cable trays
or in heat resistant plastic pipe.
Do ensure radius hose bends are fully supported to
prevent kinks developing when in service.
Do add extra insulation to steam hose for longer
runs (2m-5m) and in cold ambient conditions to
avoid excess condensate and reduction in
delivered output.
Don'ts
Don't allow steam hose to develop kinks or sags.
Don't include horizontal runs or 90
o
elbows in the
steam line.
Steam Distribution Pipe requirement
Electrode
Boiler Unit
Model
LE05(P)
LE09(P)
LE18(P)
LE30(P)
LE45(P)
LE55
LE60(P)
LE90(P)
LE110
35mm
∅
Pipe No.
54mm ∅.
Pipe No.
1
-
-
1
-
2
Duct
Pressure
Pa.
+2000
-600
+2000
-600
35mm
∅
Pipe Selection 54mm
∅
Pipe Selection
Duct width
B mm
In-duct Length
L mm
Duct width
B mm
In-duct Length
L mm
320-470
470-620
620-770
770-920
920-1070
1070-1200
300
450
600
750
900
1050
700-950
950-1450
1450+
(Kg)
650 (1.8)
900 (2.2)
1400 (3.2)
R min for 35
∅
Pipe = 250mm
R min for 54 ∅Pipe = 500mm
Flexible Steam
Pipe.
No Sags!
Distance to first
bend.
VAPAC
HUMIDIFIER
Flexible Steam
Pipe.
Flexible pipe coupling to
connect Steam pipe to Duct
pipe coupling length to allow
for line movement and
expansion. Coupling clamp
with Hose clips each end.
35 or 54 mm
copper or
stainless steel
steam pipe with
Insulation.
Fig 6
For guidance on positioning of steam pipes see Appendix 1.
For guidance on use of Multipipes see Appendix 2.

9
1.3 Plumbing Considerations.
1.3.1 Cold water supply .
General
The Vapanet range of electrode boilers is capable of
operating with a range of “raw mains” water quality. The water
supply should be within the following limits:-
Hardness 50 – 500 ppm
Conductivity 80 – 1000µS
PH 7.3 – 8.0
Silica 0
Pressure of between 1 - 8 bar.
In addition, if stainless steel electrodes are used the chlorine
level must not exceed 170 ppm.
Water Supply rates
1.20 l/min
1.20 l/min
1.20 l/min
2.50 l/min
2.50 l/min
5.00 l/min
5.00 l/min
LE05
LE09
LE18
LE30
LE45/LE55
LE60
LE90/LE110
LE05P
LE09P
LE18P
LE30P
LE45P
LE60P
LE90P
Do’s
Do install a stop-valve/Shut-off valve and a strainer close to
the unit.
Do provide a water supply with sufficient pressure and pipe
size to ensure an adequate flow rate to all units connected
to the system.
Do use the water connection with nylon nut provided.
ALL Dimensions in mm
Don'ts
Don’t use a wrench or other tool to tighten the water supply
connection - the nylon nut and rubber washer provided,
should only require tightening by hand to effect a seal. If
water seepage occurs, undo the nut to wipe the washer
clean and re-seat it.
1.3.2 Drain connection .
General
Do's
Do ensure metal drain and supply water pipework is grounded
electrically close to the unit (a ground/earth stud is
positioned on the underside of the cabinet.
Drain capacity per cylinder.
(Max.pump flow rate
at Power supply frequency)
l/min Hz
16.8
17.2
50
60.
Do’s
Do use copper or plastic pipe rated for 110
o
C.
Do arrange to discharge drain water from the unit into a
trapped and vented drain at a position where flash steam
rising from the drain line vent will not pose a problem for
the Vapac or other equipment.
Do provide adequate fall for the drain pipework to allow free
flow of water drained from each unit.
Do ensure drain line pipe size will accommodate water being
drained at the same time from all the Vapac units which
are connected to it.
KEY: -
A Tundish Fill-cup
B Steam Cylinder
C Feed Drain Manifold
D Drain Pump
F Feed Solenoid Valve
G Water Connection ¾” BSP.
H Flexible hose ¾” BSP.
K 35∅Steam Hose coupling and Hose
Clips.
L 35∅copper or plastic Drain for 110°C
Water with supports.
M Tundish
N U-trap side exit.
S Optional Strainer
V Isolation stop cock
Single Cylinder Units 30-55 kg/h
Twin Cylinder units 60-110 kg/h
Fig 7
A
B
C
D
F
K
L
M
N
H
G S V

10
1.4 Electrical Connections
1.4.1 Important E.M.C. Considerations
Use a dedicated, earthed metal conduit for both the control
signal cable and the security circuit cables along their entire
length - they may share the same conduit where practicable.
The earth must be made by "metal-to-metal" contact and
should be a good RF (Radio Frequency) earth.
The control and security circuit connections should be run in
screened cable with the screen grounded at the VAPANET
end (onto the electrical section back panel). The screen
should be maintained as close as possible to the cable ends
and any tail between the screen and the earth point must be
kept short (50 mm maximum).
Control Cable / Security Circuit
Conduit Entry Arrangement
Control Cable / Security Circuit
Screening Arrangement
Tail to be kept short
(less than 50mm)
Cables to control terminals
Screen left intact
Outer insulation
Earthed back panel
Important Power Connection Information
Vapac 24V and 9 V secondary Transformer Primary supply connections:
Vapac units are wired to allow connection to alternative site Voltages.
Make the following simple checks before connecting the power supply:-
Move the BROWN connection on the VAPANET transformer primary winding circuit to
the position marked with the supply Voltage that is to be connected between
VAPANET power terminals A1 and A2.
The transformer primary circuit terminal positions are clearly marked:- 200V, 230V,
380, 415 & 440V. If the actual (measured) site voltage is 400v the preferred
tapping is 380V. The transformer is fitted below the Drain tray, and is accessible by
removing two screws and the cover, which should be slid it towards you.
Note:
24 V a.c. Control circuit -
9 V a.c. PCB Circuit -
Transformer Primary Circuit -
And RDU.
230V ac Pump Supply. -
6.3 A 20 mm (T – Time Lag) fuse (Pt.No. 1080093) mounted on VAPANET
Echelon PCB (Pt.No.1150630).
2 A 20 mm (F - Quick blow) fuse (Pt No. 1080099) mounted on the VAPANET
Echelon PCB (Pt, No. 1150630).
Two fuses protect the control circuit on Single cylinder units F1 2.0A (slow
blow) (Pt. No. 1080095) mounted in fuse-terminal holder protects Primary
transformer and RDU unit if fitted. F2 500 mA 20 mm (F - Quick blow) fuse (Pt
No. 1080054) mounted in fuse-terminal holder protects Transformer Primary
and Pump or both pumps if two pumps are fitted.
The pump or pumps on twin cylinder units are fed from the main transformer
via a 230 volt auto winding. The pumps are protected by fuse F1 and F2 above
feeding the transformer primary.
All metal surfaces which come
into contact with each other,
must be free of paint, grease,
dirt, etc., thereby ensuring a
good low impedance R.F.
(Radio Frequency) path to
ground.
Electrical section metalwork
Metal conduit

11
1.4.2 Power Supply Connection
The unit requires the following connections as shown in the
diagram below
1.4.2.1 Volt free alarm outputs
The unit has connections for volt free alarm outputs these are on
the three double terminals next to the main power input terminals.
The top terminals are for unit volt free fault alarm as follows:
542 common for fault alarm
543 Normally closed when no fault
544 Normally open when no fault
The bottom terminals are for unit volt free run signal as follows:
545 Common for run signal
546 Normally closed when unit is in standby or
fault (not running)
547 Normally open when unit is in standby or fault
(not running)
If the unit is part of a master slave system or network, the
run & fault outputs can be selected (via keypad & display)
as either network (system) or unit only. This is selectable at
Service Engineers Level, in the Engineering Menu, in the
window “Fault/Run Scope”. The default is “network”. It is
possible to get both alarm & Run indication in all units:
Single cylinder units will give this indication if the service
interval has expired; Twin Cylinder & Networked units will
give this indication if the service interval has expired or if
the master cylinder is operating and any slave cylinder (or
cylinders) are in fault.
1.4.2.2 Unit control terminals
For unit control and network termination see section
1.6 the terminal layout is shown here.

12
1.4.3 Electrical Connections
The wiring to the Vapac should be done by a qualified
electrician. The external overcurrent protection and wiring
should comply with the appropriate Regulations and Codes
of Practice .
Important: Make sure the connection to the primary
Voltage winding of the Vapac transformer matches the
supply Voltage which is to be connected between Vapac
terminals A1 & A2.If the actual (measured) site voltage is
400v the preferred tapping is 380V .
A fused disconnect/isolator or MCB should be used to
disconnect the supply from all electrodes simultaneously.
This must be sized to suit the total maximum phase/line
current of the unit and should be located adjacent to the
Vapac cabinet or within easy reach and readily accessible.
In Vapac VAPANET units terminals A1, A2 and A3 are for
the power supply connections as indicated in the diagrams
below (twin cylinder units have two supplies A1,A2,A3 &
B1,B2,B3).
Twin cylinder units’ have terminals for the connection of
two power supply input circuits. On twin cylinder units’ this
allows individual external protection of each steam cylinder.
Fused disconnect/isolator or MCB provision must be linked
to ensure both 3 phase supply inputs are disconnected
simultaneously.
1.4.4 Cable Entry Provision
Cable glands must be used to ensure cables are held
securely at the entry position. All Vapac cabinets are
equipped with a removable gland-plate. The installing
electrician should remove this and take it to a work-
bench to drill for the required cable gland size.
1.4.5 Vapac Control Circuit Transformer
The internal control circuit of the Vapac unit operates at
24Vac - the transformer secondary is set at 24V.
As standard the Vapac VAPANET includes a
transformer with alternative primary winding options
200V, 230, 380, 415, and 440V and requires on site
adjustment to match it to the Voltage connected to
Vapac terminals A1 and A2.
The transformer also has a 9V secondary tapping which
provides power to the VAPANET 1150630 PCB.
Important: The Vapac transformer must NOT be used
to power other equipment or the warranty will be
invalidated.
1.4.6 RDU Connection
Vapac terminals 25 & 26 are included to provide a
230Vac electrical supply for the fan motor in the RDU
(Room Distribution Unit) .
Note: The 230Vac at terminals is derived from the
incoming electrical supply to the Vapac. If the local
supply cannot provide 230Vac (example 400V No
Neutral supply) it will be necessary for a transformer to
be fitted in the RDU as indicated below.
Notes:
-
1. All units must have a PE earth connection connected to the units terminal.
2. Unit with N.A. in the following tables means NOT AVAILABLE there is not a unit available to run at the voltage
and phases shown. Please check that the correct model reference is ordered and installed, for the low or high
voltage required, and at the desired steam output.
3. Standard design is for 50 Hz. Supplies. Design for 60 Hz. Also available - 60 Hz. Supply must be specified with
order as the standard pump is only 50Hz.
FOR FULL EL
ECTRO
-
MAGNETIC COMPATIBILITY A NEUTRAL CONNECTION IS REQUIRED FOR ALL PROPORTIONAL
UNITS AS INDICATED IN THE CONNECTION DIAGRAMS ON THE FOLLOWING PAGES.
RDU Connection
The three type’s of RDU are for various voltages and phase without neutrals connections that can be made to the Vapanet unit. Please refer to
the Microvap connection diagram on the following three pages as to which type of unit is required. On twin cylinder units two fan circuits as
shown below one for each cylinder will be in the RDU unit.
RDU electrical loads
Model RDU05LE RDU09LE RDU18LE RDU30L RDU45LE
Number of fans 2 3 3 5 7
Fan voltage 230 v 230 v 230 v 230v 230v
Each fan current 50Hz (60 Hz) 115 mA (105 mA) 115 mA (105 mA) 115 mA (105 mA) 115mA (105mA) 115 mA (105 mA)
RDU total load current 50Hz (60 Hz) 225 mA (210 mA) 345 mA (315 mA) 345 mA (315 mA) 575mA (525mA) 805 mA (735 mA)

13
TRANSFORMER
PRIMARY
380 – 440 V
SECONDARY
210 – 250 V
200 – 250 V 1Ph. N + earth 200 – 250 V 2Ph. + earth
380 – 440 V 2Ph + earth
Power connection
details for LExx
Units
(Units without Solid
State Relays).
Power connection
Details for LExxP
Units
(Units fitted with
Solid State Relays)

14
1.5 Cylinder Electrical demand loads
1.5.1 LExx Units
Model Ref.
LE05
LE09
Nominal Output Kg/hr 5 5 5 5 5 5 9 9 9 9 9 9
Nominal Output lb/hr 11 11 11 11 11 11 19.8 19.8 19.8 19.8 19.8 19.8
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 3.71 3.72 3.8 3.81 3.75 3.77 6.76 6.68 6.7 6.86 6.72 6.7
Electrical Supply Ph's Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
No. of electrodes 2 2 2 2 2 2 2 2 2 2 2 2
Full load Current A 19.5 17 10.5 10 9.5 9 35.5 30.5 18.5 18 17 16
Maximum overcurrent A 29.25 25.5 15.75 15 14.25 13.5 53.25 45.75 27.75 27 25.5 24
Fuse Rating/phase A 32 32 20 20 16 16 63 50 32 32 32 32
Supply cable terminals mm
2
10 10 10 10 10 10 16 16 16 16 16 16
Wiring diagram A4-LZD-559 A4-LZD-559
Cabinet size 1 1
Model Ref.
LE05
-
3
LE09
-
3
Nominal Output Kg/hr 5 5 5 5 5 5 9 9 9 9 9 9
Nominal Output lb/hr 11 11 11 11 11 11 19.8 19.8 19.8 19.8 19.8 19.8
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 3.79 3.79 3.76 3.96 3.77 3.99 6.76 6.83 6.9 6.93 6.85 6.9
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 3 3 3 3 3 3 3 3 3 3 3 3
Full load Current A 11.5 10 6 6 5.5 5.5 20.5 18 11 10.5 10 9.5
Maximum overcurrent A 17.25 15 9 9 8.25 8.25 30.75 27 16.5 15.75 15 14.25
Fuse Rating/phase A 25 20 16 16 10 10 32 32 20 20 20 16
Supply cable terminals mm
2
10 10 10 10 10 10 10 10 10 10 10 10
Wiring diagram A4-LZD-559 A4-LZD-559
Cabinet size 1 2
Model Ref.
LE18
LE30
Nominal Output Kg/hr 18 18 18 18 18 18 30 30 30 30 30 30
Nominal Output lb/hr 39.6 39.6 39.6 39.6 39.6 39.6 66 66 66 66 66 66
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 13.36 13.47 13.48 13.53 13.35 13.43 22.43 22.38 22.25 22.43 22.25 22.5
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 3 3 3 3 3 3 6 6 3 3 3 3
Full load Current A 40.5 35.5 21.5 20.5 19.5 18.5 68 59 35.5 34 32.5 31
Maximum overcurrent A 44.55 39.05 23.65 22.55 21.45 20.35 74.8 64.9 39.05 37.4 35.75 34.1
Fuse Rating/phase A 50 50 32 32 25 25 80 80 50 50 40 40
Supply cable terminals mm
2
16 16 16 16 16 16 35 35 16 16 16 16
Wiring diagram A4-LZD-559 A4-LZD-560 A4-LZD-559
Cabinet size 1 2

15
Model Ref.
LE45
LE55
Cylinder 1 1 1 1 1 1 1 1 1 1 1 1
Nominal Output Kg/hr 44 45 45 45 45 45 55 55 55 55 55 55
Nominal Output lb/hr 96.8 99 99 99 99 99 NA NA 121 121 121 121
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 32.66 33.39 33.85 33.65 33.54 33.39 NA NA 41.37 40.91 41.07 41.37
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph NA NA 3Ph 3Ph 3Ph 3Ph
No. of electrodes 6 6 6 6 6 6 NA NA 6 6 6 6
Full load Current A 99 88 54 51 49 46 NA NA 66 62 60 57
Maximum overcurrent A 108.9 96.8 59.4 56.1 53.9 50.6 NA NA 72.6 68.2 66 62.7
Fuse Rating/phase A 125 125 63 63 63 63 NA NA 80 80 80 80
Supply cable terminals mm
2
35 35 35 35 35 35 NA NA 35 35 35 35
Wiring diagram A4-LZD-560 A4-LZD-560
Cabinet size 2 2
Model Ref.
LE60
Cylinder 1 2 1 2 1 2 1 2 1 2 1 2
Nominal Output Kg/hr 30 30 30 30 30 30 30 30 30 30 30 30
Nominal Output lb/hr 66 66 66 66 66 66 66 66 66 66 66 66
Voltage V 200 200 230 230 380 380 400 400 415 415 440 440
Power input rating Kw 22.43 22.43 22.38 22.38 22.25 22.25 22.43 22.43 22.25 22.25 22.5 22.5
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 6 6 6 6 3 3 3 3 3 3 3 3
Full load Current A 68 68 59 59 35.5 35.5 34 34 32.5 32.5 31 31
Maximum overcurrent A 74.8 74.8 64.9 64.9 39.05 39.05 37.4 37.4 35.75 35.75 34.1 34.1
Fuse Rating/phase A 80 80 80 80 50 50 50 50 40 40 40 40
Supply cable terminals mm
2
35 35 35 35 16 16 16 16 16 16 16 16
Unit Total F.L.C. A 136 118 71 68 65 62
Wiring diagram A4-LZD-560 A4-LZD-559
Cabinet size 4
Model Ref.
LE90
Cylinder 1 2 1 2 1 2 1 2 1 1 1 1
Nominal Output Kg/hr 44 44 45 45 45 45 45 45 45 45 45 45
Nominal Output lb/hr 96.8 96.8 99 99 99 99 99 99 99 99 99 99
Voltage V 200 200 230 230 380 380 400 400 415 415 440 440
Power input rating Kw 32.66 32.66 33.39 33.39 33.85 33.85 33.65 33.65 33.54 33.54 33.39 33.39
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 6 6 6 6 6 6 6 6 6 6 6 6
Full load Current A 99 99 88 88 54 54 51 51 49 49 46 46
Maximum overcurrent A 108.9 108.9 96.8 96.8 59.4 59.4 56.1 56.1 53.9 53.9 50.6 50.6
Fuse Rating/phase A 125 125 125 125 80 80 60 60 60 60 60 60
Supply cable terminals mm
2
35 35 35 35 35 35 35 35 35 35 35 35
Unit Total F.L.C. A 198 176 108 102 98 92
Wiring diagram A4-LZD-560
Cabinet size 4

16
Model Ref.
LE110
Cylinder 1 2 1 2 1 2 1 2 1 2 1 2
Nominal Output Kg/hr 55 55 55 55 55 55 55 55 55 55 55 55
Nominal Output lb/hr 121 121 121 121 121 121 121 121 121 121 121 121
Voltage V 200 200 230 230 380 380 400 400 415 415 440 440
Power input rating Kw N.A. N.A. N.A. N.A. 41.37 41.37 40.91 40.91 41.07 41.07 41.37 41.37
Electrical Supply Ph's N.A. N.A. N.A. N.A. 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes N.A. N.A. N.A. N.A. 6 6 6 6 6 6 6 6
Full load Current A N.A. N.A. N.A. N.A. 66 66 62 62 60 60 57 57
Maximum overcurrent A N.A. N.A. N.A. N.A. 72.6 72.6 68.2 68.2 66 66 62.7 62.7
Fuse Rating/phase A N.A. N.A. N.A. N.A. 80 80 80 80 80 80 80 80
Supply cable terminals mm
2
N.A. N.A. N.A. N.A. 35 35 35 35 35 35 35 35
Unit Total F.L.C. A N.A. N.A. N.A. N.A. 132 124 120 114
Wiring diagram A4-LZD- 560 560 562 560 562 560 562 560 562
Cabinet size 4

17
1.5.2 LExxP Units
Model Ref.
LE05P
LE09P
Nominal Output Kg/hr 5 5 5 5 5 5 9 9 9 9 9 9
Nominal Output lb/hr 11 11 11 11 11 11 19.8 19.8 19.8 19.8 19.8 19.8
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 3.73 3.71 3.78 3.81 3.78 3.83 6.71 6.76 6.77 6.79 6.7 6.74
Electrical Supply Ph's Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
Ph+N or
2Ph
No. of electrodes 2 2 2 2 2 2 2 2 2 2 2 2
Full load Current A 22.5 19.5 12 11.5 11 10.5 40.5 35.5 21.5 20.5 19.5 18.5
Maximum overcurrent A 33.75 29.25 18 17.25 16.5 15.75 60.75 53.25 32.25 30.75 29.25 27.75
Fuse Rating/phase A 40 32 20 20 20 20 63 63 40 32 32 32
Supply cable terminals mm
2
10 10 10 10 10 10 16 16 16 16 16 16
Wiring diagram A4-LZD-559 A4-LZD-559
Cabinet size 1 1
Model Ref.
LE05P
-
3
LE09P
-
3
Nominal Output Kg/hr 5 5 5 5 5 5 9 9 9 9 9 9
Nominal Output lb/hr 11 11 11 11 11 11 19.8 19.8 19.8 19.8 19.8 19.8
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 3.73 3.79 3.82 3.73 3.87 3.79 6.74 6.76 6.81 6.89 6.85 6.94
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 3 3 3 3 3 3 3 3 3 3 3 3
Full load Current A 13 11.5 7 6.5 6.5 6 23.5 20.5 12.5 12 11.5 11
Maximum overcurrent A 19.5 17.25 10.5 9.75 9.75 9 35.25 30.75 18.75 18 17.25 16.5
Fuse Rating/phase A 25 20 16 16 16 16 40 32 20 20 20 20
Supply cable terminals mm
2
10 10 10 10 10 10 10 10 10 10 10 10
Wiring diagram A4-LZD-559 A4-LZD-559
Cabinet size 1 1
Model Ref.
LE18P
LE30P
Nominal Output Kg/hr 18 18 18 18 18 18 30 30 30 30 30 30
Nominal Output lb/hr 39.6 39.6 39.6 39.6 39.6 39.6 66 66 66 66 66 66
Voltage V 200 230 380 400 415 440 200 230 380 400 415 440
Power input rating Kw 13.34 13.36 13.35 13.48 13.39 13.57 22.38 22.43 22.35 22.38 22.32 22.41
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 3 3 3 3 3 3 6 6 3 3 3 3
Full load Current A 46.5 40.5 24.5 23.5 22.5 21.5 78 68 41 39 37.5 35.5
Maximum overcurrent A 51.15 44.55 26.95 25.85 24.75 23.65 85.8 74.8 45.1 42.9 41.25 39.05
Fuse Rating/phase A 60 50 32 32 32 32 100 100 50 50 50 50
Supply cable terminals mm
2
16 16 16 16 16 16 35 35 16 16 16 16
Wiring diagram A4-LZD-559 A4-LZD-561 A4-LZD-559
Cabinet size 1 2

18
Model Ref.
LE45P
Cylinder 1 1 1 1 1 1
Nominal Output Kg/hr 45 45 45 45 45 45
Nominal Output lb/hr NA NA 99 99 99 99
Voltage V 200 230 380 400 415 440
Power input rating Kw NA NA 33.79 33.85 33.93 33.45
Electrical Supply Ph's NA NA 3Ph 3Ph 3Ph 3Ph
No. of electrodes NA NA 6 6 6 6
Full load Current A NA NA 62 59 57 53
Maximum overcurrent A NA NA 68.2 64.9 62.7 58.3
Fuse Rating/phase A NA NA 80 80 80 80
Supply cable terminals mm
2
NA NA 35 35 35 35
Wiring diagram A4-LZD-561
Cabinet size 2
Model Ref.
LE60P
Cylinder 1 2 1 2 1 2 1 2 1 2 1 2
Nominal Output Kg/hr 30 30 30 30 30 30 30 30 30 30 30 30
Nominal Output lb/hr 66 66 66 66 66 66 66 66 66 66 66 66
Voltage V 200 200 230 230 380 380 400 400 415 415 440 440
Power input rating Kw 22.38 22.43 22.43 22.38 22.35 22.25 22.38 22.43 22.32 22.25 22.41 22.5
Electrical Supply Ph's 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes 6 6 6 6 3 3 3 3 3 3 3 3
Full load Current A 78 68 68 59 41 35.5 39 34 37.5 32.5 35.5 31
Maximum overcurrent A 85.8 74.8 74.8 64.9 45.1 39.05 42.9 37.4 41.25 35.75 39.05 34.1
Fuse Rating/phase A 100 100 100 100 50 50 50 50 50 50 50 50
Supply cable terminals mm
2
35 35 35 35 16 16 16 16 16 16 16 16
Unit Total F.L.C. A 146 127 76.5 73 70 66.5
Wiring diagram A4LZD 561 562 561 562 559 562 559 562 -559 562 -559 -562
Cabinet size 4
Model Ref.
LE90P
Cylinder 1 2 1 2 1 2 1 2 1 2 1 2
Nominal Output Kg/hr 45 45 45 45 45 45 45 45 45 45 45 45
Nominal Output lb/hr NA NA NA NA 99 99 99 99 99 99 99 99
Voltage V 200 200 230 230 380 380 400 400 415 415 440 440
Power input rating Kw NA NA NA NA 33.79 33.85 33.85 33.65 33.93 33.54 33.45 33.39
Electrical Supply Ph's NA NA NA NA 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph 3Ph
No. of electrodes NA NA NA NA 6 6 6 6 6 6 6 6
Full load Current A NA NA NA NA 62 54 59 51 57 49 53 46
Maximum overcurrent A NA NA NA NA 68.2 59.4 64.9 56.1 62.7 53.9 58.3 50.6
Fuse Rating/phase A NA NA NA NA 80 80 80 80 80 80 80 80
Supply cable terminals mm
2
NA NA NA NA 35 35 35 35 35 35 35 35
Unit Total F.L.C. A NA NA 116 110 106 99
Wiring diagram A4LZD 561 562 561 562 561 562 559 562
Cabinet size 4

19
1 2 4 5 6 7 8 9
10 11 12
HYGROSTAT WITH VOLT FREE CONTACTS (max.
RESISTANCE OF EXTERNAL CONNECTION 100
Ohms.
1.6 Control Circuit Connections
1.6.1 Control Circuit Wiring
Use a dedicated, earthed metal conduit for both the
control signal cable and the security circuit cables,
sharing the same conduit if practicable.
Use screened cable for all control and security circuit
connections to minimise risk of electrical interference.
The screen should be grounded at the VAPANET end
only. See detail on page 7. NB. The control signal
should be connected to ground at the PCB by
connecting either terminal 5 or 6 to terminal 7 –
I mportant note if the controller output is
referenced to ground, then the “leg” which is
ground must be the one linked to terminal 7.
1.6.2 Proportional Control
The VAPANET Electrode Boiler (LExxP) models can
all be operated by either a potentiometric signal, a
lonworks network signal or by one of 6 standard
proprietary DC analogue signals.
Input signal:
Potentiometric control
0-5V
0-10V
0-20V (Actually 0-18V – not phase cut)
2-10V
1-18V
4-20mA (Ensure jumper J1 is in place)
Network (Slave unit – demand generated by
Master)
Response:
8-100%
1.6.3 Control Signal Selection
Selection of the control signals is done a part of the
initial set-up procedure using the keypad display. For
confirmation that the signal has been selected, view
the information window. If the unit has not got a
keypad then this is done on the configuration board
1150634 mounted on the main control board 1150630
using the jumpers provided. The top right hand link
should be made indicating that the unit is an
“Electrode boiler” and the appropriate left hand link
representing the actual site control signal should be
linked using the jumper plugs provided
1.6.4 On/Off Control
Vapanet models can be operated by a single
step humidistat which has Volt-free contacts –
select control option Pot.
DC 0 - 20 4 – 20 Ma POTENTIOMETRIC
VOLTAGE CURRENT CONTROL
CONTROL CONTROL min. 135 Ohms
Max. 10,000 Ohms
NOTE :- FOR CURRENT INPUT ONLY JUMPER J1 ON THE
1150630 CONTROL BOARD MUST BE LINKED.
Jumper J1
should be
fitted if
control
signal is
4 – 20 mA
Vapac PART No. 1150630
16
CR6 1
NetCR7
J6
CR5 1
6 6
10
CR3
16
J1
J2
J3
1
F2
CR1
1
F1 CR2
J4
18
CR4
1
16
J5
CR2
configuration
resistor
CSP
CR2
J1
Vapac part no. 1150634
Electro
boiler
Pot high
Pot medium
Pot low
Softened
De-iron
De-min
0-5v
0-10v
2-10v
1-18v
0-20v
4-20mA
pot
Full o/p
or slave
Network
J2
UCP1UCP2

20
1.6.5 Sensing Head
The units are designed to operate using a sensing
head, supplied by Vapac Humidity Control Ltd. which
should be connected as shown below. Other
propriety sensing heads which give a DC signal
may also be used, providing the control signal is
connected to control terminals 5 & 6, and the
sensing head is powered externally from the unit.
If “Frost Protection” is required do not connect
the thermistor input from the sensing head to
control terminals 1 & 2, which should be used to
connect the “frost protection thermistor” (part
number 1220275) instead. Frost protection is
selected via the display – Set the frost demand
above the minimum cylinder demand (LE units
>20%; LE(P) & LE(C) units >8%)
Note:
Use of the 24V supply of the VAPANET unit
to power other items of equipment will
invalidate the Vapac warranty.
1.6.6 Security Circuit / E.P.O. Shutdown
As standard units are shipped such that terminals 9 &
10 are provided for connection of an E.P.O.
(Emergency Power Off) switch or fire shutdown
facility. Other control interlocks, such as high limit
humidistat, airflow switch and/or fan interlock and time
switches etc. should be connected to terminals 11 &
12. Please note that if a display is connected to
the unit “DI1 Control Option” must be set to
“Shutdown”.
NB breaking terminals 9 & 10 will prevent any unit
operation including frost protection.
1.6.7 Load Shed Option
This can only be evoked via a display, either “hard
wired” or hand held. When this option is selected,
making the connection between terminals 11 & 12 will
activate the “load shed” software routine, which will
inhibit the operation of either the unit or in the case of
twin cylinder units unit or just the 2
nd
cylinder. This will
limit the power used during peak supply periods. If
this option is selected, the fan interlock, airflow switch
and/or high limit hygrostat should be wired into
terminals 9 & 10 with the EPO switch if fitted (as per
the drawing on the far right). It should be noted that
selection of this option will mean that frost protection
cannot be utilized.
Please note that if a display is connected to the
unit “DI1 Control Option” must be set to the
following:
Single cylinder units: “Load shed”.
Twin cylinder units: either “Load Shed Cyl 2” or
“Load Shed Both”.
Vapac’s accessory kit part numbers for sensors are
Remote Room mounted sensing head FVKIT-107 - 1
And
Remote Duct mounted sensing head FVKIT-108 - 1
11 10 12
8 7 6 1 2 4 5 9
Load Shed
Standard Operation Load Shed Operation
9 5 4 2 1 6 7 8
12 10 11
E.P.O.
Fire Stop
Fan
Air Flow
igh Limit
Interlock
Switch
ygrostat ygrostat
Switch
Interlock
igh Limit
Air Flow
Fan
Fire Stop
E.P.O.
6 1 2 5 4 12 9 8 7 11 10
1 3
CN2
CN1
1 Vi G Vh G
NC(b)
G(B)
Vt(A)