Elecro Engineering Nano SPA Heater Installation instructions

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Nano SPA Heater
Installation & Operating Manual

ENGLISH
www.elecro.co.uk

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ENGLISH
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Important Notes!
Thank you for purchasing the NANO Spa Heater manufactured in England
to the highest standards.
To ensure your new heater will give years of trouble free service please
carefully read the following instructions.
Incorrect installation will aect your warranty.
Do not discard this manual, please retain for future reference.
Product Overview
NOTE unions for rigid pipe work not shown.
LH End tting
Heater ‘ON’
Indicator (red)
Thermal safety
Cut-out
re-set switch
Temperature
set
point dial
Top cover
Flow switch
Foot /Carrier – A
Flow tube
Foot / Carrier—B
RH End Fitting
Hosetail Stepped
Connector
1¼” (32mm) or
1½” (38mm)
Fig 1.

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Positioning
Your heater should be horizontally or vertically sited allowing sucient
space for pipe connections and wiring, it should be screw xed securely to
a rm base or wall.
The heater should be installed at a low point in the ltration system.
It should be positioned downstream (after) of the lter and upstream
(before) of any dosing or other water treatment plant. (see g.2)
Fig 2.
NON RETURN
VALVE
WATER
TREATMENT
SPA
PUMP
FILTER ELECRO NANO HEATER

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Positioning (continued)
Pipe Work
It is essential that the pipe work connecting to and from the heater
has a minimum bore (internal diameter) of 1¼” (32mm).
To assist correct air purging and to ensure the heater remains completely
full of water during operation, the return pipe which carries the water back
to the spa must incorporate a safety loop or ‘kick-up’ in the pipe as close as
possible to the heater (see g 3).
NOTE: When coupling to exible pipe a safety loop can simply be
created by routing the pipe up and over an obstacle. Remember to
use pipe clips to securely fasten all hose connections.
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Fig 3.
For vertical wall
mounting water
must always enter
at the bottom
Flow switch
at top
YES NO
NO
NO
NO

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Weather Protection
The heater must be installed within a dry weather proof enclosure.
CAUTION! If the heater is not used during winter months it must be
drained to prevent frost damage.
Electrical Connection
The heater must be installed in accordance with the country / regional
requirements and regulations. In any event the work must be carried out
by a qualied electrician, who will provide a certicate of conformity upon
completion of the work.
It is essential that the power supply to the heater is protected by a
30mA RCD (Residual Current Device). If in doubt consult a qualied
Electrician.
Power Requirements
Flow Requirements
The ow rate of water into the heater must not exceed 17,000 litres per
hour (3,740 UK gallons/hour) A higher ow rate will require the installation
of a bypass to prevent damage to the heater element. The heater will not
operate with a ow rate below 1,000 litres / hour (220 UK gallons/hour)
230V 1 Phase-
Power Output Load
1-kW 5-Amp
2-kW 9-Amp
3-kW 13-Amp
4-kW 18-Amp
5-kW 22-Amp
6-kW 27-Amp

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Water Quality
The water quality must be within the following limits:
PH 6.8 - 8.0; TA (Total alkalinity) 80—140ppm (parts per million)
Chloride Content MAX: 150 mg/litre
Free Chlorine: 2.0 mg/litre
Total Bromine: Max 4.5 mg/litre
TDS (Total Dissolved Solids) / Ca)lcium hardness 200 - 1,000ppm
Nano SPA heaters are built with a titanium heating element, which are
suitable for use on spas with a salt concentration up to 8000ppm (8g/
litre). For salt concentrations over 8000ppm, a titanium ow tube is also
recommended.
Water chemistry is complicated if in doubt seek expert advise.
Operating Instructions
Upon completion of the installation, run the water-circulating pump to
purge the system and heater of air (i.e. remove any trapped air in the
system and heater). TIP: You can encourage air out of the heater ow tube
by gently elevating the exit port of the heater when the pump is running.
The heater will only switch ‘On’ (red light indicator illuminated) when the
following criteria are met ie:
• Water circulating pump is ‘On’ delivering in excess of 1,000 litres /
hour (220 UK gallons/hour)
• Temperature set point dial is set to a higher value than that of the water
Q: How long will it take to heat my spa?
A: Assuming no heat losses, and a heater sized in the ratio 1.5-kW per
1,000 UK gallons of water (4,545-litres): it will take 2 days of continuous
running to raise the temperature of a pool from tap temperature to
swimming temperature. Heat loss will slow the heating process,
particularly during periods of cold weather, hence the higher the water
tempera-ture is to be maintained above average ambient air temperature,
the slower the heating process will become.
The only inuencing factors are the level of insulation and the location of
the pool with regard to wind shelter.

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Useful advice: To reduce running costs and speed up the heating
process; insulate the spa wherever possible. A cover when not in use
is an essential minimum to retain heat.
Trouble Shooting
Heater will not switch ‘On’
In most cases this will be the result of one of the following points not
being met.
Possible cause 1: The set point temperature has been achieved.
To conrm increase the set point value by turning the temperature set
point dial to a value greater than the current water temperature.
Possible cause 2: The ‘Thermal safety cut-out’ has tripped.
Remedy: Remove button cover and press red button to reset (see g 4)
If a positive click is felt, the cause of the tripping must be investigated and
could be caused by a debris build-up or air pocket trapped inside the ow
tube of the heater.
Possible cause 3: Insucient ow.
If using a cartridge lter: Conrm this by running the system with the
cartridge removed from your pump and lter unit, this will supply the
heater with the maximum ow rate your unit is capable of. If the heater
then switches ’On’ (ie: red light ’On’) a blocked cartridge can be conrmed
to be the cause. The cartridge should be cleaned or replaced.
Fig 4.

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If using a sand lter: Check the pressure indicator on your sand lter and
back wash if necessary.
Note: In some cases the ‘Thermal safety cut-out’ tripping and a low
ow rate can be linked ie: when a lter becomes choked air can be
drawn into the ltration system and become trapped inside the
heater so causing the thermal cut-out to trip.
Quick Function Test
Observe the main electricity meter when the heater is on (ie: red light ‘On’)
and then observe it again when the red light is o. The test should show
that the meter is recording more electricity being used by the heater when
the red light is ‘On’.
It is impossible for an electric heater to waste energy, if it is drawing power
then that power will be turned into heat that will be transferred to the
water.
Accurate Function Test
If a more accurate test is required to conrm that your heater is delivering
the specied heat output, two electricity meter readings will need to be
taken from the properties main electricity meter, with an exact one hour
interval (ie: take one meter reading and then a second reading exactly one
hour later) then by subtracting the rst reading from the second
reading the number of units (kilo watts kW) consumed can be calculated.
Note that your heater is also rated in kW hours. The spa pump and heater
will need to be running continuously during the test (ie: with the heater
red light ’On’) To avoid inaccurate results when performing this test, it is
important to refrain from using other high current consuming appliances
in the property (such as tumble dryer, showers, cookers etc).
A large domestic spa pump of 1 horsepower will draw less than 1-kW in a
one hour period. The conclusion of the test should prove that for example
a 6-kW heater and a ½horsepower pump will draw between 6.3-kW ~
6.5-kW in one hour. It is impossible for an electric heater to waste energy,
if it is drawing power then that power will be turned into heat that will be
transferred to the water.

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The ow tube does not feel warm
Due to the high eciency of your electric heater no warmth should be
detectable from the ow tube of the heater. The most likely causes of the
ow tube feeling warm are:-
Possible cause 1: The heater has been positioned in direct sunlight.
Possible cause 2: An air pocket is trapped inside the heater particularly if
the tank feels warmer at the highest point of the tank (as air rises).
The water entering my spa does not feel much warmer
The temperature gain of the water after it has passed through the heater
will be directly proportional to the volume of water being pumped in
relationship to the power output of the heater.
For example: A 6-kW heater, when connected to a 4,000 litre / hour
pump, will produce a lift in temperature of approximately 1.2°C (almost
undetectable to the human hand) however, as the water being heated is
re-circulated from a single body of water, the time required to heat it
remains unaected by the volume of ow. A popular misconception is that
slowing down the ow rate will speed up the heating process.
RoHS Compliance Statement
Elecro Engineering Limited certify that our Electric Spa Heater Range
complies in accordance with RoHS Directive 2011/65/EU on the restriction
of hazardous substances.
Waste of Electrical / Electronic Equipment
This product complies with EU directive 2012/19/EU
Do Not dispose of this product as unsorted municipal waste.
This symbol on the product or on it’s packaging indicates
that this product should not be treated as household
waste. Instead it should be handed over to the applicable
collection point for the recycling of electrical and
electronic equipment.
By ensuring this product is disposed of correctly you
will help prevent poten-tial negative consequences for

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the environment and human health, which could
otherwise be caused by inappropriate waste handling
of this product. The recycling of materials will help to
conserve natural resources. For more information please
contact your local Civic oce, your household waste
disposal service or the retailer where you purchased the
product.
Guarantee
Your heater is guaranteed for2 years from the date of purchase against
faulty workmanship and materials.
The manufacturer will replace or repair, at it’s discretion, any faulty units
or components returned to the company for inspection. Proof of purchase
may be required.
The manufacturer will not be liable in cases of incorrect installation of the
heater, inappropriate use or neglect of the heater.

11 Gunnels Wood Park |Stevenage |Hertfordshire |SG1 2BH |United Kingdom
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