Astral Pool Viron 250 User manual

14/08/2013
INSTALLATION AND
OPERATING INSTRUCTIONS
Melbourne: 03 8796 8600 Gold Coast: 07 5552 2600 Perth: 08 9350 2600
Sydney: 02 9853 2100 Townsville: 07 4750 3100 [email protected]
Brisbane: 07 3308 5400 Adelaide: 08 8152 7600 www.astralpool.com.au
Bolero ND
Cleaner
Viron Cartridge Filter
INSTALLATION AND OPERATING INSTRUCTIONS I INSTALLATION AND OPERATING INSTRUCTIONS
Viron eVo Series Pool
& Spa Heater

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
2
INDEX
Introduction
Introduction.................................................................................................3
Notice to Installers........................................................................................3
Safety Rules ...............................................................................................3
Operation
Lighting Instructions......................................................................................4
Operating Instructions ...................................................................................4
Turning Gas Off ...........................................................................................4
Chemical Balance ........................................................................................4
Corrosion Prevention in Heaters......................................................................5
Digital Thermostat Operation ..........................................................................5
Display symbol Indication...............................................................................6
Maintenance
Maintenance Instructions ...............................................................................7
Winter Operation..........................................................................................7
Installation
Installation Instructions ..................................................................................7
Flow Rates .........................................................................................7
Water Connections ..............................................................................7
Plumbing Diagram ......................................................................................................... 8
Heater Dimensions .......................................................................................8
Indoor Installation .........................................................................................9
………………………………………………………………………………………………… 10
………………………………………………………………………………………………… 11
Clearances ............................................................................................... 11
Electrical Connection .................................................................................. 11
Gas Connection ......................................................................................... 12
Pressure Switch Adjustment ......................................................................... 12
…………………………………………………………………………………………………13
Testing Inlet Pressure ............................................................................ ….13
Condensate drain………………………………………………………………………….. 14
Burner Performance Details
Burner Performance ............................................................................................ 15
Troubleshooting
Fault Finding and Remedies................................................................................. 16
Gas Pipe Sizing
Gas Pipe Sizing Tables........................................................................................ 16
Wiring diagram
Viron Series Wiring Diagram ................................................................................ 17
…………………………… ……………………………………………………………………18
Warranty
Terms and Conditions.......................................................................................... 19

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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INTRODUCTION
Congratulations on your purchase of a Viron Pool and Spa Heater by Astral Pool. Proper installation and service
of your new heating system and correct chemical maintenance of the water will ensure years of enjoyment. The
Viron Series Heater is a compact lightweight and highly efficient gas fired pool and spa heater. It is equipped with
features that take advantage of new technology developed exclusively by AstralPool, to provide one of the most
efficient and user friendly heaters available. The patent pending heat exchanger will save up to 20% of operating
costs over conventional pool & spa heaters, generate condensate which can automatically top up pool water,
adjust burner rate to match the heat demand of your pool & spa and is approved with reduced clearances to save
on installation space.
The Viron can safely be connected to PVC pipe. It requires high water flow rates which help the heater run cooler,
giving greater efficiency and long life. In addition, it is equipped with electronic start up and an accurate electronic
thermostat to ensure ease of use and accurate temperature control. The electronic display tells at a glance the
operational status of the heater.
Note:
The appliance is not intended for use by young children or infirm person without supervision. Please ensure that
young children are supervised to ensure that they do not play with the appliance.
NOTICE TO INSTALLERS
This appliance must be installed by an authorized person.
This appliance must be installed in accordance with the installation instructions, local gas fitting regulations,
Standards Australia Installation Code AS/NZ 5601 and any other relevant statutory authorities.
Refer to data plate for details of gas type, gas consumption and burner pressure.
WARNING: Electrical maintenance and repairs of this equipment must only be done by qualified persons in
accordance with Australian and state regulations.
SAFETY RULES
1. Spa or hot tub water temperature should never exceed 40˚C.
2. Drinking of alcoholic beverages before or during spa or hot tub use can cause drowsiness which could
lead to unconsciousness and subsequently result in drowning.
3. Pregnant women beware! Soaking in water above 38˚C can cause foetal damage during the first three
months of pregnancy.
4. Before entering the spa or hot tub, the user should check the water temperature with an accurate
thermometer, spa or hot tub thermostats may err in regulating water temperatures by as much as 2˚C.
5. Persons with a medical history of heart disease, circulatory problems, diabetes or blood pressure
problems should obtain their physician’s advice before using spas or hot tubs.
6. Persons taking medications which induce drowsiness, such as tranquillisers, antihistamines or
anticoagulants, should not use spas or hot tubs.
WARNING! Should overheating occur or the gas supply fail to shut off, turn off the manual gas control valve
to the appliance. Do not use this heater if any part has been under water.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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FOR YOUR SAFETY – READ BEFORE LIGHTING
This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light the
burner by hand.
BEFORE OPERATING smell all around the appliance area for gas. Be sure to smell next to the floor because
some gas is heavier than air and will settle on the floor.
WHAT TO DO IF YOU SMELL GAS. Do not try to light any appliance. Do not touch any electrical switch. Do
not use any telephone in your building. Immediately call your gas supplier from a neighbour’s house.
DO NOT PLACE ARTICLES ON OR AGAINST THIS APPLIANCE
DO NOT USE OR STORE FLAMMABLE MATERIALS NEAR THIS APPLIANCE
DO NO SPRAY AEROSOLS IN THE VICINITY OF THIS APPLIANCE WHILE IT IS IN OPERATION.
NOTE – Servicing shall be carried out only by authorized personnel.
OPERATING INSTRUCTIONS
1. STOP! Read the safety information above.
2. Turn off electric power to appliance.
3. This appliance is equipped with an ignition device which automatically lights the burner. Do not try to light
the burner by hand.
4. Wait five minutes to clear out any gas. If you then smell gas, STOP! Refer to instructions above.
5. Turn filtration pump on.
6. Turn on power to the heater and press the pool/spa button to select pool or spa mode.
7. Set thermostat to desired setting and the ON/OFF switch to turn the heater ON.
8. The heater will ignite in around 40 seconds.
9. If the appliance will not operate, turn heater power supply off. Repeat instructions 5 to 7 above. If the
appliance still does not ignite, call your service technician.
TO TURN GAS OFF TO APPLIANCE
1. Turn off all electrical power to the appliance.
2. Turn off gas tap in gas line prior to heater.
CHEMICAL BALANCE
It is imperative that correct chemical balance be maintained in your pool and spa water, otherwise corrosion of
your heater may occur. Corrosion of the heat exchanger voids warranty. Your local pool shop specialist or
spa retailer can advise correct chemical balance. Your water should be checked and maintained regularly by a
pool water professional. As a guide the following parameters may be used.
pH 7.6 to 7.8
Total Alkalinity 80 to 120 ppm
Calcium Hardness 150 to 250 ppm
Salinity 4000ppm max. Excessive salt can damage your heater.
You should test your water chemical balance at least on a weekly basis.
Excessive sanitiser can damage your heater. Chlorine should not exceed 3 ppm and bromine should not exceed 5
ppm. Salt chlorinators, especially when used on spa pools or indoor or covered pools, can easily produce
excessive chlorine levels which will damage the heater internals.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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CORROSION PREVENTION IN HEATERS
All pool and spa heaters use copper or copper nickel to make their heat exchangers as it is the most efficient
material in transferring heat from the combustion chamber into the water. The typical life expectancy of a well
maintained pool/spa heater is between 5 and 12 years.
The addition of sanitisers (Chlorine, Bromine etc) and other water balancing and conditioning chemicals can
increase the rate of wear and tear on the heat exchanger and associated parts in your heater.
There are three most common reasons for heat exchanger corrosion which can be avoided with a little care and
attention.
1. Excessive Sanitiser. This means too much Chlorine or Bromine in the water. Be careful, if the level of
Chlorine or Bromine is excessively high your test kit (and the pool shops) may not read accurately or indeed may
show a nil reading. Any time a salt chlorinator is operating for extended periods, (when heating the swimming pool
from cold), particularly if the weather is overcast or the pool enclosed or covered, the Chlorine level may exceed
normal levels. When heating a Spa Pool, turn the chlorinator down or off for the duration of the heating period.
2. Out of balance water. The water balance is a combination of pH, total alkalinity, Calcium hardness and
temperature. Balanced water will help prevent corrosion of your heater. Balanced water should be between 7.2 -
7.8 pH.
3. The addition of acid to lower pH. Acid must always be added in small quantities and spread over the
pool surface evenly, not added in to the skimmer. Do not add a litre at a time, add a cupful each day to lower your
pH.
If you have a salt chlorinated INDOOR pool or COVERED pool be very careful of the level of Chlorine being
produced. If you use a salt chlorinated spa be very careful of the level of Chlorine as the Chlorinator is usually
sized for the pool and therefore should be switched off when heating the spa. Leaving the chlorinator on can
raise the chlorine level very rapidly in a small volume of water.
These comments are intended as a guide only and are not definitive answers or recommendations on pool water
chemistry. Astral Pool’s intention is to provide a little understanding of the potential problems of water chemistry
and the dangers of corrosion to heaters (and other pool equipment and fittings).
YOUR WATER SHOULD BE ADJUSTED & BALANCED PRIOR TO ANY CORRODED PARTS BEING
REPLACED.
DIGITAL THERMOSTAT OPERATION
DESCRIPTION
The sophisticated digital thermostat provides temperature read out, set point temperature, operating status of the
heater and any fault conditions.
TEMPERATURE DISPLAY
The temperature display indicates water temperature in the inlet of the heater. Therefore the pump must be
operating for an accurate pool or spa water temperature to be displayed.
Comfortable pool temperature is between 26˚C and 30˚C. Normal spa temperature is between 36˚C and 38˚C. To
select your desired temperature press the up or down button repeatedly until the desired temperature is reached.
To prevent rapid cycling of the heater, the thermostat has an inbuilt time delay which prevents the heater from
turning on for two minutes after the set point has been reached. If the time delay is activated, the symbol “L” will
be displayed on the LCD screen on the front of the heater. This is part of normal operation.
Should a fault condition occur, the heater will lock out and prevent further heating. A lock out condition is indicated
by the symbols F0 to F9. To reset a lock out condition, turn the power off for five seconds.
When the water temperature is heated to within 1 degree of the thermostat set point, the Viron burner will
modulate or turn down so that the set point is accurate maintained and not exceeded. This prevents waste of
energy typically associated with on/off burners. In addition, the set point is maintained very accurately, so the
when using your spa pool, you will notice very little variation in water temperature.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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DISPLAY SYMBOL INDICATION
Under fault conditions the thermostat will display a set of alpha numeric symbols to indicate the status of the
heater. The meaning of each symbol and action to be taken are listed as follows:
SYMBOL MEANING ACTION
Temp Display Unit has power. No action.
F0 Heater locked off, thermistor If water temperature reads
wire disconnected or water greater than 0°C, phone for
at 0°C (freeze conditions). service.
F1 Thermostat reads greater Allow water to cool below 40°C ,
than 45°C. turn heater off then on again.
F2 Mechanical Hi Limit greater Allow water to cool below 30°C,
than 45°C. or 55°Cturn heater off then on again.
F3 Thermistor fault Phone for Service
F4 N/A
F5 N/A
F6 Flue temperature safety device Phone for Service
locked out due to over temperature
F7 Condensate drain blocked Phone for Service
F8 Heat exchanger sensor fault Phone for Service
F9 Heat exchanger sensor too hot Phone for Service
Greater than 240degC
LHeater locked out on time No action. Heater will
delay for 2 minutes. Automatically reset after
time delay.
time delay.
Pump operating & sufficient No action.
water pressure to operate heater
Thermostat calling for heat. No action.
Electronic Flame Supervision
operating.
Burner Operating No Action

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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MAINTENANCE
It is recommended that you check the following at least every six months and at the beginning of every swimming
season.
1. Examine the flue outlet and panel louvers for blockages. Make sure there are no obstructions to the flow
of air to or from the appliance.
2. Keep the heater area clear and free of combustibles and flammable liquids. Chlorine should not be stored
in the vicinity of the heater. Chlorine and acid vapours, when drawn through a heater, can rapidly cause
corrosion of the heat exchanger.
3. Keep the heater area free from garden refuse and debris. This will help prevent insects nesting in the unit
and ensure extended life and reliability of your heater.
4. Have your heater professionally inspected at least every 2 years.
WINTER OPERATION
If the pool won’t be used for a month or more, turn the heater off at the main gas isolation valve. For areas where
there is no danger of freezing, water should circulate through your heater all year long even though you are not
heating your pool.
Where freezing is possible, it is necessary to drain the water from the heater. This may be done by loosening the
inlet or outlet barrel union. If the heater is below water level, isolate it from the pool first by closing shut off valves
before and after the heater.
CAUTION: If the heater has been drained for freezing conditions, do not turn on until the system is circulating
water
INSTALLATION
THIS APPLIANCE MUST BE INSTALLED BY AN AUTHORISED PERSON. Refer to heater data plate for
specifications of gas type, gas consumption, burner pressure and water pressure.
This appliance must be installed in accordance with local regulations and Australian Standard Installation Code
AS/NZ 5601.
The installer must test the operation of the appliance before leaving.
FLOW RATES
The Viron Pool Heater requires a minimum of 200 litres per minute flow for 250 models, 250 litres per minute flow
for 350 models, 300 litres per minute flow for 450 models and 350 litres per minute for 550 models. The maximum
permissible flow rate is 500 litres per minute. For flow rates in excess of 500 litres per minute, an external by-pass
valve must be fitted.
WATER CONNECTIONS
The heater should always be installed after the pump and filter. The water connections are located on the right
hand side of the heater. The inlet and outlet are clearly marked. Water connections require 50 mm PVC glue in
plumbing.
All automatic sanitising devices must be installed after the heater and in such a way that the sanitiser cannot enter
the heater without first mixing with the water in the pool or spa. Sanitisers that are connected prior to the heater
will void heater warranty.
A non return valve is not required to be fitted between the filter and the heater.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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PLUMBING DIAGRAM
HEATER DIMENSIONS
Model
Dimension A
Dimension B
Dimension C (Gas Conn)
Viron 250
747mm
285mm
511mm
Viron 350
747mm
285mm
511mm
Viron 450
950mm
395mm
714mm
Viron 550
950mm
395mm
737mm
Condensation Drain Hose (optional)
To Solar
From Solar
From Pool
Pump
Filter
Heater
Chlorinator
Return to Pool
Heater Diagram
1. Plumbing in high pressure 50mm PVC pipe
2. Connection to heater in Class 12 or higher
3. All automatic Chlorinators or Sanitisers Must be installed after heater
PVC Piping

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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INDOOR FLUE INSTALLATION
For indoor installations a purpose built indoor model must be used or the outdoor unit converted by an authorised
person. The appliance will be labelled as an indoor model and a 125 mm flue adaptor will be fitted to the
appliance. Flue for indoor units must be purchased through AstralPool and can be run up to 8m in length.
Heater must be installed to AS/NZ 5601. Access and suitable working areas must be available to the heater.
Flue pipe is supplied with a galvanised sleeved end for the external application and an unsleeved aluminium end
for fitment to appliance. The flue pipe can be cut shorter with a knife / saw.
1/ Pre bend the flue where required.
Bends are made by curving the flue pipe around a gentle radius such as a pipe or knee. Do not over bend and
kink flue pipe. Keep bends to a minimum and use as large as radius as possible. Minimum internal radius is
250mm.
Bends can be restraightened if required.
2/ Fit flue pipe to appliance (unsleeved end of flue). Insert flue connection fully into flue pipe.
Fit hose clamp to connection and tighten.
3/ Form extra bends where required. Care should be taken when forming bends to not create a low point where
condensation may collect. Condensation should be able to drain to the heater or out the flue outlet.
The flue should be bracketed at intervals of 1 M using standard 125 mm standoff brackets available at most
plumbing suppliers.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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The flue temperature will be approximately 85 degrees C and should be kept at least 25 mm clear of any
combustible surface.
4/ Joining flue sections.
Supplied with the flue is a special joiner piece. To join the flues insert a bead of silicon into both ends of the joiner .
Push the flue into the end of the joiner piece. Secure the flue with pop rivets. Repeat for the second flue pipe
connection.
5/ Rooftop terminations.
All flue exiting the roof must be shielded with the gal cover. Extra lengths of gal can be supplied. Decktite fittings
/ flashings must be attached to the galvanised flue cover. Brace flue in high wind applications.
Locate flue cowl onto reduced end of the gal outer covering / flue pipe. Attach with rivets / screws to hold into
place.
6/ Wall terminations.
Ensure location is suitable as flue gases exit all around cowl and may blow back onto walls, eaves, features
causing discolouration or mould and moisture issues. Condensation will occur around the flue exit area and
condensation may drip from the flue outlet.
All flues exiting the wall must be shielded with the gal cover. Extra lengths of gal can be supplied. Decktite
fittings / flashings / wall exiting covers must be attached to the galvanised flue cover.
For long extensions of flue exiting the wall bracing may be required in high wind applications.
Locate flue cowl onto reduced end of the gal outer covering / flue pipe. Attach with rivets / screws to hold into
place. Ensure a drain hole in the cowl is facing down.
The flue pipe must slope slightly towards the cowl for the last horizontal run (approx 2 deg) to allow condensation
to drain.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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CLEARANCES
Installation clearances must comply with AS/NZ 5601.The heater is approved for installation at reduced
clearances as below.
Outdoor Clearances from combustible surfaces non combustible surfaces
Front
300mm
300mm
Both sides
300mm
300mm
Rear
300mm
50mm
Above
1000mm
1000mm
Indoor Clearances from combustible surfaces non combustible surfaces
Front
300mm
300mm
Both sides
300mm
50mm
Rear
300mm
50mm
Above
500mm
500mm
Heater must be installed on a fireproof base.
VENTILATION
When installing the heater indoors, it is imperative that an adequate supply of fresh air is provided for combustion.
Failure to provide adequate ventilation voids all warranties and may be a danger to persons or property.
Two permanent openings shall be provided directly to outside. The openings shall be located to ensure the
distance between the top of the upper opening and the ceiling of the room or enclosure, and the distance between
the bottom of the lower opening and the floor of the room or enclosure does not exceed 5% of the height of the
room or enclosure.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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The minimum vertical dimension of any free ventilation opening shall be 6 mm.
The minimum free ventilation area provided directly outside by each opening shall be:
MODEL
AREA
Viron 250
57,000 mm2
Viron 350
87,000 mm2
Viron 450
112,500 mm2
Viron 550
147,500 mm2
If ventilation provided is obtained from an adjacent room then these areas will increase.
The following diagram is provided as a guide only. All fluing and installation work must be carried out by an
authorized person. Fluing must conform to local regulations and to A.G.A. installation code AS/NZ 5601. Care
must be taken to provide the correct ventilation and correct fluing materials in close proximity to combustible
surfaces.
Do not install spa blowers in the same room as a gas heater. This is potentially dangerous to spa
users.
Do not store chemicals or fuel in the same room as the gas heater. This may cause fire or explosion.
When installing in a garage the Viron Series Heater must be installed 450 mm above floor level.
1500
600
Upper grille for fresh air
ventilation
Lower grille for fresh air
ventilation
●
Approved gas
termination cowl

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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ELECTRICAL CONNECTION
The heater is supplied with a standard 10 amp 3 pin plug for connection to a 240V 10 amp GPO. All pool or spa
equipment connected to mains power should be protected by an RCD circuit breaker.
GAS CONNECTION
250/350/450 models.
The gas connection is on the rear of the heater. A 22mm M.I. connection is provided for gas line connection. An
approved manual shut off valve must be installed in the gas fitting line before the heater.
The gas fitting line should be installed by an authorised person and comply with local regulations and Australian
Standard code AS/NZ 5601. The gas line from the meter will usually be of a larger size than the gas inlet
connection.
The heater gas valve has a built in pressure regulator and ⅛” pressure test point. On starting the heater, a
manometer must be used and the supply inlet pressure checked while the heater is running against the heater
data plate. Incorrect inlet pressures may void warranty and may result in service charges, should service be
required.Gas valves are preset and should only be adjusted by trained Astral Pool technicians.
PRESSURE SWITCH ADJUSTMENT
The Viron Pool Heater incorporates a water pressure switch which allows the burner to operate only when the
circulating pump is operating. The pressure switch is designed to operate with the heater installed up to 3 metres
above or below the surface level of the pool or spa.
It is imperative that the following be undertaken by the person who is commissioning (first starting) your pool or
spa heater. On initial start up of the heater it may be necessary to adjust the water pressure activation switch.
This switch is located behind the top right hand side panel and is screwed into the water manifold. The pressure
switch is a safety device, designed to allow operation of the heater only when the circulating pump is on and there
is sufficient water flow through the heater. It must shut the heater down immediately the pump is switched off.
To check the operation of the switch:
1. Connect the heater to mains power supply and turn power on. The thermostat should not yet display “θ”.
2. Turn on pump. The thermostat should now display “θ”.
3. Turn pump off. The thermostat should no longer display “θ”.
4. If display does not respond in this way, adjust the pressure switch as detailed below. If display responds
correctly, perform a final check with the heater operating – see the section below titled “Starting the
heater”.
To check the operation of the switch:
1. Connect the heater to mains power supply and turn power on. The thermostat should not yet display “θ”.
2. Turn on pump.
3. View the display of the heater to confirm the “θ”has appeared on the LCD display on front of heater.
4. If no symbol is present, slide the toggle up to allow adjustment, then rotate knurled wheel anti clockwise
(as viewed from above) until “θ” is displayed.
5. Switch pump off.
6. View LCD display to confirm the “θ” has disappeared.
7. If “θ” symbol is present when pump is OFF or “θ” does not disappear within 1 (one) second of pump
turning off, the pressure switch must be adjusted.
8. With Pump turned OFF, turn knurled wheel clockwise to increase the pressure required to activate the
switch.
9. Repeat steps 2 to 8 until symbol appears and disappears when pump turns on and off.
10. When the pressure switch is correctly set, slide the toggle down to lock the knurled wheel in postion.
11. If pressure switch cannot be made to activate heater when pump is turned on and off, a flow switch may
need to be purchased and fitted. Contact your local AstralPool office for details.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
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WARNING: If the pressure switch cannot be adjusted correctly, DO NOT OPERATE THE HEATER, contact
Astral or an Authorised Service Agent for advice.
1. Perform a final check with the heater operating.- See the section below titled “Starting the heater”.
It is imperative that the heater is installed so that it does not operate when the circulating pump stops.
Recommended methods to achieve this are:
a. Correct adjustment of internal pressure switch. Ensure heater does not turn on two or three minutes after
circulating pump is turned off.
b. Installation of an external flow switch may be preferred under certain installations where internal pressure
switch does not turn heater off when circulator stops.
Pressure Switch Adjustment
Slide toggle
up to allow
adjustment
Turn wheel in
direction of
arrow to
decrease
pressure
required to
operate heater

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
15
TESTING INLET PRESSURE
1. Note – gas pressure must be measured when unit is operating.
2. Set thermostat to “OFF”.
3. Remove top cover (2 screws at rear of heater, remove L/H side panel, remove front 2 screws hidden
inside side panel area)
4. Remove electrical enclosure screws and hinge cover forward.
5. Loosen screw from ⅛” brass test point located on inlet side of gas valve
6. Connect manometer tube to test point
7. Set thermostat to “ON” and wait for burner to ignite
8. Once burner has ignited, the manometer must indicate the nominal inlet pressure listed below.
9. Adjust inline pressure to meet minimum required pressure at main gas regulator. Do not adjust gas valve
settings..
10. Tighten test point screw.
11. Refit covers.
Required Inlet Static gas pressure (ie: when heater not operating)
Natural Gas 1.13 kPa minimum 5 kPa maximum
Propane 2.75 kPa minimum 5 kPa maximum
PERFORMANCE DETAILS
TO CHECK BURNER PERFORMANCE – Must be performed with a combustion analyser
1. Turn off power supply to pump and heater.
2. Turn off gas supply to unit.,
3. Remove top cover.
4. Remove electrical enclosure screws and hinge electrical cover forward.
5. Setup gas combustion analyser
6. Set up manometer to inlet side of gas valve.
7. Adjust gas rate screw 4 turns anticlockwise.
8. Turn on gas supply.
9. Turn on power to heater.
10. Start heater
11. Ensure heater is running at full fan rate.
12. Check inlet gas pressure is between max and min settings.
13. While heater is running adjust gas ratio screw to achieve a CO level of between 30ppm to 60 ppm for
Natural Gas models and between 50ppm and 150ppm for model 250 LPG
14. Check meter gas usage rate to ensure gas rate is as specified.Gas rate must be within +/-5% of nominal
rate.
15. Remove manometer and tighten test point.
16. Remove analyser.
17. Refit electrical cover.
18. Refit cover.
Gas inlet pressures (all models) during burner operation on high fire
Natural Gas 1.13 kPa
Propane 2.75 kPa
CO level (all models)
Natural Gas 30ppm minimum 60ppm maximum
Propane 50ppm minimum 150ppm maximum
Gas inlet rates
Viron 250 Natural gas & Propane 190mj/hr
Viron 350 Natural gas 290mj/hr, Propane 280mj/h
Viron 450 Natural gas & Propane 375mj/hr
Viron 550 Natural gas & Propane 490mj/hr

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
16
CONDENSATE DRAIN
The Viron heater is a highly efficient gas appliance capable of generating 12 litres an hour of condensation.
Suitable drainage provision must be provided to ensure condensation does not build up in the heater or flood
damage surrounding areas. Do not raise the drain hose higher than the exit point of the appliance.
Alternatively, the condensate can be used to replenish or “top up” your pool water. A condensate recovery kit can
be purchased from your local Astral Pool equipment supplier.
The condensate has a pH of approximately 6.8. Most chlorines and sanitisers used for pool water disinfection will
increase the pool water pH over a period of time, so an additional advantage of the condensate produced by your
Viron Heater is that the low pH will counter balance the high pH of the disinfectant used in most pools.
IMPORTANT: Chlorines, disinfectants and sanitisers usually require a narrow bank of pH in which to work
effectively. Ensure you check the pH of your pool or spa weekly, and adjust as necessary.
ELECTRONIC FLOW RESPONSE
The Viron heater is capable of being linked to the AstralPool series of Viron multispeed pumps via RJ12 cabling
(not supplied). By taking advantage of this connection, you can ensure your heater will operate at peak
performance and last for many years.
Connection to the Viron heater is via the RJ12 socket located inside the access panel where the water connections
are made to the heater. Connections for the pump are made through the rear of the electrical box.
In connecting your Viron Pool and Spa heater to your Viron multispeed pump, the two appliances will communicate
to adjust speeds on the pump based on the demands of the heater.
•If the heater is in the ON position pump will operate at a minimum of “Medium” speed
•If the heater is operating (burner symbol on screen) the pump will operate on “High” speed
•When the heater shuts off the pump will return to the default speed set on the pump
If you require assistance with this connection, please contact your local AstralPool Australia branch for further
advice.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
17
TROUBLESHOOTING
HEATER WILL NOT LIGHT
Possible cause
Remedy
No display
Check if power to heater is turned on
Pump not running
Start pump
Pump air locked
Check for leaks
Filter dirty
Clean filter
Pump strainer basket clogged
Clean strainer
Thermostat turned off
Turn on
Set temperature lower than water temperature
Increase set temperature
Water too hot-fault condition displayed
Refer to fault indication table
Gas turned off
Turn gas cock on
Heater in a Fault condition
Refer to fault indication table
HEATER SHORT CYCLING (RAPID ON AND OFF OPERATION)
Possible cause
Remedy
Insufficient water flow
Clean filter and pump strainer
HEATER MAKING KNOCKING NOISES
Possible cause
Remedy
Low water flow
Check pump condition
Heater operating after pump has shut off
Shut off gas supply and call for service
Heat exchanger scaled
Shut off gas supply and call for service
Ignition'Module'LED'Flash'Code'
If the heater cannot be made to perform correctly, please contact the Astral Pool office closest to you.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
18
GAS PIPE SIZING TABLES
1.13 kPa gas meter pressure
Some areas of VICTORIA
Maximum run of copper pipe with average number of fittings
Model
20 mm
25 mm
32 mm
40 mm
50 mm
VIRON 250
2 m
8 m
30 m
75 m
320 m
VIRON 350
-
4 m
14 m
35 m
140 m
VIRON 450
-
3 m
8 m
20 m
90 m
VIRON 550
-
1
6 m
14 m
60 m
1.25 kPa gas meter pressure
S.A., W.A., some areas N.S.W.
Maximum run of copper pipe with average number of fittings
Model
20 mm
25 mm
32 mm
40 mm
50 mm
VIRON 250
6 m
25 m
90 m
240 m
320 m
VIRON 350
3 m
14 m
45 m
110 m
320 m
VIRON 450
2 m
8 m
25 m
70 m
300 m
VIRON 550
-
6 m
18 m
45 m
200 m
2.75 kPa gas meter pressure
N.S.W. some areas, Victoria some areas, Qld some areas
Maximum run of copper pipe with average number of fittings
Model
15 mm
20 mm
25 mm
32 mm
VIRON 250
4 m
40 m
160 m
320+ m
VIRON 350
2 m
20 m
85 m
280 m
VIRON 450
-
12 m
50 m
160 m
VIRON 550
-
8 m
35 m
100 m
Gas Pipe Sizing Tables are indicative only. All pipe sizing should be calculated by an authorised person.

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
19
VIRON DSI MODELS WIRING DIAGRAM

Inst.296 Viron eVo Series Pool & Spa Heater V12.13
20
VIRON PILOT MODELS WIRING DIAGRAM
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