Thermoline Scientific Equipment TCH-150 User manual

TEMPERATURE AND HUMIDITY
CHAMBERS
MODELS INCLUDE:
TCH-150
TCH-460
WITH EUROTHERM 3216 CONTROL
Thermoline Scientific Equipment Pty. Ltd.
T/A Thermoline Scientific ABN 80 000 859 129
10-12 Ross Place. Wetherill Park. N.S.W. 2164. Australia.
P.O. Box 6862, Wetherill Park Delivery Centre, N.S.W. 1851. Australia.
Phone: [phone]. International: 61 2 9604 3911.
Fax [phone]. International: 61 2 9725 1706.
Email: [e-mail] Web: www.thermoline.com.au

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IMPORTANT INFORMATION:
This manual contains operating and safety information. The operator must read and understand
the contents of this manual prior to using the equipment. Incorrect operation may cause harm or
damage, the severity of which is classified by the following alert boxes. Ensure that this manual is
saved for future reference:
Warning alerts apply when there is a possibility of personal injury.
Caution alerts apply where there is a possibility of damage to the
equipment.
To maintain safe operation of this equipment be aware of the ALERT BOXES that appear
throughout these operating instructions
INDEX:
IMPORTANT INFORMATION: Page 1
INDEX: Page 1 & 2
PRODUCT WARRANTY: Page 3
INTRODUCTION: Page 4
THE MANUAL: Page 4
UNPACKING: Page 4
LOCATION & SERVICES REQUIRED:
•GENERAL: Page 4
•LOCATION: Page 5
•ELECTRICAL: Page 5
•WATER: Pages 5 & 6
•DRAIN: Page 6
ASSEMBLY & INSTALLATION:
•ASSEMBLY: Page 6
•INSTALLATION: Pages 6, 7 & 8
FUNCTION: Page 8
PERFORMANCE: Page 8
C-TICK: Page 9
PRINCIPLE OF OPERATION:
•CONTROLS: Page 9
•AIR CIRCULATION: Page 9
•TEMPERATURE: Page 9
•HUMIDITY: Page 9
•SECTION OF SIDE VIEW (Figure 1): Page 10
EXPLANATION OF CONTROLS:
•CONTROL PANEL LAYOUT (Figure 2): Page 10
•MAIN SWITCH: Page 11
•TEMPERATURE CONTROL: Page 11
•HUMIDITY CONTROL: Page 11
•OVER TEMP LIGHT: Page 11
•HUMIDITY SWITCH: Page 11

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OTHER CONTROLS:
•WATER PRESSURE REGULATOR: Page 11
•AIR HEATING ELEMENT SAFETY: Page 11
•HUMIDITY HEATING ELEMENT SAFETY: Page 11
ELECTRICAL – POWER LEAD: Page 12
OPERATING THE CABINET: Pages 12 to 16
•CHANGING THE SET VALUE: Pages 13
•ADJUSTING THE VENTS: Pages 14 & 15
SENSOR CORRECTION FOR CALIBRATION PURPOSES: Page 16
MEASURING EQUIPMENT: Page 16
ADJUSTING THE CALIBRATION OFFSET: Page 17
MAINTENANCE:
•CLEANING: Page 18
•CARING FOR STAINLESS STEEL: Page 18
•WATER TROUGH: Page 18
•WATER FLOW ADJUSTMENT: Page 19
SPARE PARTS LIST: Page 20
TECHNICAL ASSISTANCE: Page 20
OPTIONS:
•RETRANSMISSION: Page 21
•CHART RECORDER: Page 21
•ALARMS: Page 21

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PRODUCT WARRANTY:
1. This warranty is limited to goods purchased and installed in *Australia.
Twelve (12) Months full warranty on parts and labour by Thermoline Scientific through its
authorised dealers or service organisations, will repair or at its option replace any part found to
contain a manufacturing defect in material or workmanship without charge to the purchaser for
parts, service labour or any necessary shipping or cartage costs for parts only. This warranty
does not apply to damage caused by accident, misuse, fire, flood, or acts of God. It does not
apply to damage caused from failure to properly install, operate or maintain the goods in
accordance with the printed instructions provided. To obtain prompt warranty and service,
simply contact Thermoline Scientific.
2. If warranty service is required, Thermoline Scientific will endeavour to have an authorised
service organisation carry out the work if there is an available agent, however if it is decided to
return the equipment to our main workshop then it is the customers responsibility to pay the
freight cost of this return, Thermoline Scientific, after the repair, will return the goods at our
cost, to the customer.
The customer should always contact Thermoline Scientific for approval to return and
seek advice as to the best and most cost effective method of return.
3. *Export Warranty: Limited to replacement of Parts Only. Supplied Ex Factory, Australia. This
warranty does not apply to refrigeration compressor(s), that are not protected by Thermoline
Scientific factory installed (VFP) Voltage Fluctuation Protection unit.
4. Limitation of Liability: Except to the extent not permitted by law, Thermoline Scientific
excludes all warranties, conditions and terms implied by law. If any implied warranty, condition
or term does exist, Thermoline Scientific’s liability for breach of that implied term is limited, at
the option of Thermoline Scientific, to replacement or repair of goods or part thereof, or
payment of the cost of repairing or replacing the goods or any part of the goods.
The buyer does not have, under any circumstances, any cause of action or right to claim or
recover from Thermoline Scientific for, or in respect of, any loss or damage of any kind
whatsoever, caused directly or indirectly by:
•any defect in material or workmanship of, or any other defect whatsoever in, or unsuitability
for, any purpose of the goods or any part of the goods; or
•default or negligence on the part of Thermoline Scientific or of any employee,
contractor or agent of Thermoline Scientific or of any person for whom
Thermoline Scientific had legal responsibility relating to the supply, or otherwise
concerning the goods or any legal part of the goods.
5. The 12 month warranty period starts from the date the equipment is supplied.
When making a claim for repairs under warranty please state the model number
and serial number. These are printed on the compliance sticker, normally found
on the front of the cabinet. Our records will show when the cabinet was
despatched and if the warranty claim is valid.

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INTRODUCTION:
Thank you for selecting this product from the large range of products manufactured in Australia by
Thermoline Scientific.
The materials incorporated in this design have been carefully selected for their durability, technical
performance, and practicability, the resultant product is one that we are proud of.
THE MANUAL:
Please take the time to read this manual, it contains information that will allow you to understand
how the equipment operates, what it can and cannot do, how to operate the controls, and how to
maintain the equipment.
Ensure that the manual is kept safe but accessible for current and future operators to refer to.
UNPACKING:
Remove the equipment from the packing material, and check that the delivery is complete. Delivery
should include the following:
•1 x Temperature and humidity cabinet.
•Stainless steel open wire type shelves (TCH-150 = 2 shelves, TCH-460 = 4 shelves).
•1 x Hose connection fitting.
•1 x Operating manual.
•1 x Perspex holder.
Optional extras: These items could be included as part of the packing list if ordered:
•Water supply bottle (25 litre bottle complete with hose connection fittings).
•1 x 4 pin plug for retransmission connection.
•Circular chart recorder (complete with chart paper and chart pens).
•Data loggers.
•Extra shelves.
Retain the packing materials until the equipment has been thoroughly tested.
Notify the detail of any damage without delay to your supplier, or Thermoline Scientific.
LOCATION AND SERVICES REQUIRED:
This section deals with the provision and connection of services that will be required for your
cabinet to function properly, and advice on where to locate the cabinet.
GENERAL:
The equipment is designed to operate under the following ambient conditions:
•Indoor use only.
•Ambient temperature range: 10ºC to 35ºC
•Ambient humidity range: Maximum relative humidity of 85%RH for temperatures up to 25ºC
•Optimum performance of the chamber is achieved within ambient temperatures of 20ºC to
25ºC range, and 45%RH to 55%RH. The cabinet can be used outside these ranges but
performance levels will be affected. Eg: If ambient temperature levels are high (above
30ºC), the attainable temperature and humidity levels inside the cabinet will be limited.

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LOCATION:
The cabinet can operate at temperatures up to 80ºC with high humidity (see control envelope page
8). Therefore it should placed in a well ventilated area away from sensitive equipment that may be
affected by the local heat and humidity.
Since ambient air is usually drawn through the cabinet, the operating range of the cabinet will be
greatly affected by the ambient temperature and humidity. It is best located in a stable air
conditioned environment.
The cabinet is provided with castor wheels so that it can be easily moved around.
Allow sufficient space around the cabinet to provide adequate ventilation. We recommend a space
of 30cm on both sides and 10cm at the rear. In particular, make sure that the ventilation slots
around the top of the cabinet are not blocked off or restricted in any way.
Ensure that there is sufficient room in front of the cabinet to allow the door to open.
SERVICES:
ELECTRICAL:
Confirm that the power supply is suitable for this equipment.
Refer to the equipment rating plate for details:
TCH-150: 10 amps 240 volts 50Hz.
TCH-460: 15 amps 240 volts 50Hz
Note: Only the TCH-150 model plugs into a standard 10 amp power point (otherwise known as a
general purpose outlet or gpo). The TCH-460 requires a 15 amp power point. You will notice that
the plug has a large earth pin and will not plug into a standard 10 amp power point.
WARNING: Ensure that the electrical outlet is earthed, is the correct voltage, and
capable of carrying the stated current.
Model TCH-150 is suitable for bench top or floor use, whereas the TCH-460 is
suitable for floor standing only. These cabinets are not suitable for stacking.
WATER:
A water supply is required for the humidity trough inside the cabinet. The connection for the water
supply is found on the right hand side of the cabinet.
Since the water level is automatically regulated, the water supply can come from either town water
or from a gravity fed water reservoir.
If the water supply is town water, we recommend that it should be filtered to prevent the build up of
mineral salts frequently found in town water. The water in the humidity trough is constantly being
heated, and therefore evaporation will leave mineral deposits behind.
An alternative method, and one that we recommend, is to use a water supply from a gravity fed
tank. Thermoline supply an optional 25 litre water tank complete with hoses and connection fittings.
This tank should be elevated by at least 1 metre and filled with water, the 25 litres would last at
least 2 to 3 days even under the worst operating conditions.
The gravity fed water supply has a number of advantages over a town water supply:
•Firstly, the water in the tank can be “treated water”: such as distilled water or deionised
water. The deionised water does have the potential under certain conditions to corrode
stainless steel (refer to “caring for stainless steel” on page 18). Using distilled water will not

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leave behind the mineral deposits that town water does, this will keep the water trough
cleaner and reduce maintenance.
•Secondly, if the automatic water level controls were to fail or if there was a water leak, the
worst spillage would be 25 litres instead of a potential flood.
DRAIN:
Because we are controlling humidity levels inside the cabinet, there may be water coming out of
the drain located inside the cabinet. There is also a drain valve and an overflow pipe in case of a
malfunction.
Therefore it is essential that the location for the cabinet has a floor drain for the water to flow into.
Water from the cabinet will exit through a 19mm drain pipe on the left hand side of the cabinet, you
will need to connect this drain pipe to the floor drain (see note below).
IT IS IMPORTANT THAT THE CABINET DRAIN PIPE IS CONNECTED TO A
SUITABLE WASTE OUTLET (DRAIN) AT ALL TIMES. MAKE SURE THAT THERE
ARE NO RESTRICTIONS IN THE DRAIN PIPE, IT WILL NEED TO COPE WITH AN
OVERFLOW OF 3 LITRES PER MINUTE IN THE CASE OF A FAULT.
WE ADVISE THAT THE WATER SUPPLY AND DRAIN PIPES SHOULD BE
FLEXIBLE. THIS WILL ALLOW THE CABINET TO BE MOVED AWAY FROM THE
WALL FOR ACCESS TO THE REAR OF THE CABINET DURING SERVICE.
ASSEMBLY & INSTALLATION:
ASSEMBLY:
SHELVES: Place the shelves at the required level. The shelf runners are fixed at 100mm centres.
PERSPEX HOLDER: This holder is provided so that the operating manual can be kept with the
equipment. Use the 2 x cross-head screws mounted on the left side of the cabinet above the cable
port to fix the Perspex holder to the cabinet. See photo 2.
INSTALLATION:
•Locate the cabinet in a well ventilated area on a firm level surface as described earlier. The
cabinet is fitted with castor wheels so that it can easily be moved during installation.
•Leave sufficient room at the rear and sides for air flow around the cabinet as previously
described (30cm each side 10cm at the rear).
•Leave enough room in front of the door to allow it to open fully when loading the cabinet.
•Connect the drain pipe at the left side of the cabinet (see photo 1 & 2 for location), to a
suitable floor drain with flexible hose (drain pipe is 19mm diameter).
•Connect the water supply to the cabinet, either mains water or gravity fed, to the snap on
connector located at the right side of the cabinet (photo 1).
•Note: Gravity fed water tank should be at least 1 metre above the ground, to provide a
suitable head for the water to flow properly.
•Once the cabinet is in position with all of the services connected, use the lock-down levers
on the castor wheels to prevent the cabinet from moving.

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Photo 1, Front view. Photo 2, Left side view.
•Before turning on the water supply or the power, make sure that the drain valve is closed.
The drain valve is located in the area behind the hinged cover below the door. Open the
hinged cover to gain access to the drain valve (see photo 3 below). The drain valve is
shown in the closed position. Note: Prior to leaving the factory, the water pressure regulator
has been left fully open as it should be when the water is supplied from a gravity fed bottle.
If a town water supply is used it may be necessary to adjust the water pressure regulator.
See the section in “maintenance” regarding adjustment of the pressure regulator.
Photo 3: Access to drain valve.

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•Plug the cabinet into the power point. Note: only the TCH-150 model can plug into a
standard 10 amp, 240 volt power point, the TCH-460 requires a 15 amp, 240 volt power
point.
•You are now ready to use the cabinet!
FUNCTION:
This equipment is used to provide an economical and accurate temperature and humidity
controlled environment for laboratory evaluation and long term storage of products, within the
range shown below in the control envelope.
NOTE: Temperature and humidity inside the cabinet can only be controlled at temperatures
above the ambient.
WARNING: Do not use flammable solvents or combustible materials in this cabinet,
as fire or explosion may occur. This equipment uses components that
may be a source of ignition.
PERFORMANCE:
The operating range for this equipment is ambient +5ºC to +80ºC, and 15% to 90%RH (depending
on ambient temperature and humidity).
MAXIMUM TEMPERATURE: MAXIMUM HUMIDITY:
For this product is 80ºC For this product is 90%RH (possibly 95%RH
with vents closed)

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C-TICK
The equipment referred to here complies with requirement of AS/NZS 1044:1995 electromagnetic
interference (EMI).
PRINCIPLE OF OPERATION:
Read this section in conjunction with figure 1. This will give the operator a guide on how the
cabinet actually controls the conditions within the workspace.
CONTROLS:
Temperature and humidity are controlled by 2 x Eurotherm 3216 digital indicating instruments.
These are mounted on the control panel at the top of the cabinet.
AIR CIRCULATION:
In order to maintain close temperature and humidity tolerances, good air flow is required. Air is
circulated by a centrifugal fan wheel mounted behind the ceiling panel inside the cabinet. This
wheel is driven by a circulating fan motor mounted outside the working area. Air is forced down the
rear air duct, across heating elements, and the water trough, before returning vertically through the
workspace through to ceiling panel for the cycle to start again.
Since the cabinet is not fitted with a refrigeration system there is no active cooling or
dehumidification. In order to compensate for this we provide two adjustable vents on top of the
cabinet, an air inlet and an air exhaust. The operator can adjust these vents to increase or
decrease the amount of ambient air that is mixed with the air inside the cabinet. In this way the
temperature and humidity range of the cabinet can be altered. (See “adjusting the vents” page 15
for further details).
Note: The cabinet is not fitted with a refrigeration system, and it is therfore not possible to
control temperature and humidity inside the cabinet, at levels below the outside ambient
temperature. In fact, the ambient temperature needs to be at least 5ºC lower than the set
temperature in order for the cabinet to properly control the conditions inside the cabinet.
Eg: ambient temperature =25ºC, minimum set temperature = 30ºC.
TEMPERATURE:
The air is heated by means of an element behind the rear air duct, and cooled by the addition of
fresh ambient air through the air inlet vent on top of the cabinet. The temperature controller cycles
the heating on and off to maintain stable temperature.
HUMIDITY:
The air is humidified by a heating element in the water trough in the bottom of the cabinet at the
back.
The air is dehumidified by the addition of fresh ambient air through the air inlet on top of the
cabinet. The humidity controller cycles the trough element on and off to maintain stable humidity.

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Figure 1: Section side view of cabinet, showing air flow:
EXPLANATION OF CONTROLS:
Figure 2: Control Panel Layout.

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18-5-10 TCH-150 & 460
MAIN SWITCH:
This is a combination power switch and circuit breaker, when turned on this switch allows power to
be supplied to the controls. The circulating fan motor runs as soon as the power is turned on as
long as the door is closed (the door is interlocked with a door switch to turn the fan off when the
door is open).
CAUTION: The equipment is fitted with a combination circuit breaker, mains switch. If
the circuit breaker continues to trip, it may indicate an electrical fault exists. Switch
Off the power and consult a qualified technician.
Temperature/Humidity Control: The two controls are Eurotherm 3216 microprocessor
instruments with digital indication of the set value and operating value.
Temperature control:
This is a Eurotherm 3216 microprocessor based instrument, with digital indication of set
temperature and operating temperature to 0.1ºC. Control parameters are configured to provide
stable temperature control with minimum overshoot and quick recovery times.
Maximum recommended temperature is 80ºC
Humidity control:
This is a Eurotherm 3216 microprocessor based instrument, with digital indication of set humidity
and operating humidity to 1%RH. Control parameters are configured to provide stable humidity
control with minimum overshoot and quick recovery times.
Maximum recommended humidity is 90%RH (to 95% with vents closed)
Over-Temp Light: This light should only be illuminated when a high temperature condition occurs.
ie. If the operating temperature is more than 2ºC higher than the set temperature.
Humidity Switch: This switch turns the humidity function on or off. When the switch is turned off
the humidity display also goes off and the cabinet functions as a temperature only cabinet.
OTHER CONTROLS:
Water Pressure Regulator: Located behind the hinged access panel in the base of the cabinet.
Air Heating Element Safety: (Non Operator Adjustable): This thermostat is factory set to turn off
the air heating element if the circulating fan stops.
Humidity Heating Element Safety: (Non Operator Adjustable). This thermostat is factory set to
protect the humidity trough element from over heating due to lack of water.

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18-5-10 TCH-150 & 460
ELECTRICAL - POWER LEAD
Model TCH-150: A mains power lead with a three pin plug and right angle IEC socket is supplied
for connection between the male IEC socket located on the side of the cabinet and a 10 amp
general purpose outlet (power point).
Model TCH-460: A mains power lead with a three pin 15 amp plug is supplied for connection to a
15 amp general purpose outlet (power point). Note that an outlet with this current rating in Australia
has a large earth pin.
OPERATING THE CABINET:
1) Ensure that the chamber is located as previously described, refer to the index, LOCATION,
Page 5. Connect the water supply, drain pipe, and electrical power as previously described.
Turn on the water supply.
Turn on the mains power at the power point.
2) Loading/Unloading the Chamber
Load Distribution
There is a direct relationship between the temperature/humidity uniformity throughout the
workspace and the air distribution.
If the air can not freely circulate, then the controlled conditions can not be maintained.
Product under evaluation should be distributed as evenly as possible across each shelf
level, so that air flow is not impeded.
3) Door Opening
When the door is open, the controlled conditions will begin to deteriorate. To minimise
losses always close the doors as soon as practical. Should the door be opened for a long
time, then the control may extend the time to return to the set conditions beyond that
normally expected. Note: a door switch turns off the fan and heating elements when the
door is open.
4) Position the mains switch to the ON position (reset) and immediately both controllers will go
through a short initiation period, the two displays will then indicate the operating value at
the top display and the set value at the lower display. Note: The Humidity switch has to be
“on” for the humidity control to work. If there is no digital display on the humidity control the
humidity switch is turned off. The main switch will be illuminated when turned on.
5) The water level in the trough inside the cabinet is controlled automatically by a float switch
that turns a solenoid valve on or off as the water level rises and falls. The humidity switch
has to be on for the water to flow.
The humidity element will not operate until the water in the trough covers the element. If
town water is used as a water supply the high water pressure may cause the float switch to
“bounce”. This will result in the solenoid valve rapidly clicking on and off with the float
switch. If this occurs you may need to adjust the water pressure regulator (see page 19 for
details on how to do this).
6) If humidity control is not required, turn the humidity switch off. The humidity control will have
no display.
Tip! When operating at elevated temperatures, start off by leaving the humidity switch in
the “off” position. Allow time for the temperature to stabilise before turning on the humidity
switch. This will reduce condensation on the walls and reduce water consumption.
7) The controllers are Eurotherm 3216 microprocessor based instruments which have been
factory configured for range, sensor type, and engineering parameters for optimum control.

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Operator access to the control parameters is limited to adjustment of the set value and
calibration offset only.
8) CHANGING THE SET VALUE (SP)
OVER TEMPERATURE INDICATION
All Eurotherm 3216 controllers are fitted with an automatic over temperature alarm. In the event of
a malfunction of the Thermoline product, the alarm will switch off all forms of heating if the actual
temperature exceeds the set temperature by 2.0°C. This will be indicated by a red flashing
indicator and a scrolling message of ‘Over Temperature’ on the bottom display of the controller.
OPERATING
VALUE
SCROLL
BUTTON
SET VALUE
(SP)
DOWN
ARROW
UP
ARROW
HOME
BUTTON
Use the up and down arrows
to change the Set Value(SP)
in the lower display. When
the desired SP is reached
leave for 2 seconds and the
digits will flash to confirm
entry.
The SP has been changed to
40.0 degrees in this image.

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18-5-10 TCH-150 & 460
9) Adjusting the vents:
As previously described, there are two vents on top of the cabinet (see photo 4 below). The air
inlet vent has a hole in it which acts as a relief valve when closing the door.
Both vents are adjustable so that the operator can increase or decrease the amount of ambient
air that is mixed with air inside the cabinet.
For higher humidity both vents will be closed, for lower humidity the vents will be more open.
The ambient temperature and humidity will have a large bearing on the temperature and
humidity attainable inside the cabinet. If the cabinet is in an air conditioned environment, which
would normally be at a low humidity (45 to 55%RH), then the operator could expect to achieve
lower humidity inside the cabinet.
See the graph on page 16 as a rough guide to the humidity levels that can be achieved with
vents open or vents closed.
Photo 4: Air inlet and exhaust vents on top of the cabinet.

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SENSOR CORRECTION FOR CALIBRATION PURPOSES:
This section deals with the introduction of a calibration “offset” in order to correct the displayed
temperature or humidity value (top display).
The temperature and humidity sensor cannot be placed in the middle of the workspace, simply
because of the risk of damage. Therefore there will be a difference between the displayed
operating value, and the actual values measured at the centre of the workspace.
The “OFFs” parameter as shown in previous images is deliberately promoted to the operator
access level, so that it can be used to correct the displayed operating value.
If adjustments need to be made use the calibration procedure below:
MEASURING EQUIPMENT
Ensure that the equipment used to verify the actual temperature and humidity at the centre of the
workspace is accurate. A certified instrument or one that has been calibrated against a traceable
source is required.
Place the reference instrument in the centre of the workspace , leave it for a suitable period of time
to allow it to stabilize, and then take a reading.
Using the temperature control as an example, let us assume that the top display (PV operating
temperature), is reading 37.0ºC, and your reference instrument is reading 37.2ºC. That is a
calibration error of +0.2ºC.

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ADJUSTING THE CALIBRATION OFFSET
First step is to press the
scroll button. The screen will
then change to the PV Offset
screen.
CAUTION: The Offset
value with few exceptions is
between –0.5 and +1.5.
The need to use a value
outside this range should
be carefully considered. If
in doubt, return the value to
zero and recalculate the
offset value.
Press the scroll key again to
return to the original screen.
The offset value will have
changed to the new value.
The instrument will then
increase or decrease the
output to alter the operating
value.
The scroll key has been
pressed. The display shows
the calibration (PV.OFS)
value. This value may be
adjusted, small increments
only. Note: PV.Offset is to 2
decimal places.

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MAINTENANCE
Apart from the normal levels of cleanliness, the chamber should be regularly maintained to ensure
trouble free operation. A “periodic inspection and maintenance” programme can be arranged in
some Australian locations, or a service manual can be purchased from Thermoline if you wish to
do your own repairs.
Lubrication of moving parts is not necessary since all bearings are sealed, but there are one or two
essential maintenance chores that should be performed regularly:
CLEANING:
The internal and external surfaces of the cabinet can be cleaned with a soft damp cloth. Always
have in place a program of regular cleaning using a soft damp cloth with a mild solution of soap
and water and allow to dry.
CARING FOR STAINLESS STEEL
Stainless steel is under most conditions extremely resistant to corrosion. This is in part due to the
addition of chromium and nickel to the steel and the formation of a durable chromium oxide at the
surface during the manufacturing process. There are several chemicals which will attack the
surface of stainless steel, plus the lack of oxygen at the surface will cause rusting, corrosion and
pitting. Note: Deionised water is particularly corrosive, to minimise, maintain a Neutral pH (7-9).
WATER TROUGH:
The water trough inside the cabinet provides the humidity for the cabinet. Since water is constantly
evaporating from this trough, mineral deposits can be left behind (especially if town water is used.
Regular draining of the humidifier will help to keep these deposits to a minimum.
To drain the humidity trough:
•Turn the power off.
•Turn the water supply off.
•Open the drain valve and allow the trough to drain. (See photograph on page 3 for location
of drain valve).
•Remove the stainless deflector panel by simply lifting it to gain access to the trough. Use a
soft damp cloth to clean the trough.
•Close the drain valve and turn the water back on again. The trough will automatically fill
with water again.
•After flushing the trough it will take a while for the water to heat back up again and for the
temperature and humidity to stabilise.
You should perform this procedure every 3 months if town water is used, less often if distilled water
is used.

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WATER FLOW ADJUSTMENT:
Water regulator: This valve is used to reduce water pressure and to stop float switch “bounce”
when water is injected in.
If the water pressure regulator needs to be adjusted use the following procedure below:
Photo 4: Water pressure regulator.
When the water supply is gravity fed:
•Pull the water regulator knob towards you and turn it clockwise as far as it can go. This will
open the valve fully (there is still enough pressure reduction through the valve even when
fully open to reduce “bounce”).
When mains water is connected to the cabinet:
•As described previously, when town water is connected as the water supply, the water
pressure can cause the float switch to “bounce”. This will result in the water solenoid valve
clicking in and out as the float switch bounces on the water. You can reduce the water
pressure by adjusting the regulator.
•Pull the water regulator knob towards you and turn it anti-clockwise until the float switch
“bounce” is reduced. Note: If you turn the regulator fully anti-clockwise the water supply will
be turned off.