Thermalec 12THR, 36THR, 24THR, 72THR, 120THR Installation, Operation And Maintenance Manual
INSTALLATION, OPERATION AND MAINTENANCE
BEFORE YOU BEGIN INSTALLATION READ THE
MANUAL CAREFULLY
WARNING
Only qualified personnel, should install and maintain this equipment.
Unauthorized alteration or improper maintenance of this unit may release
the manufacturer from any warranty claims.
Check all electrical connections to all components within the heater for
tightness. Connections can become loose during shipment and handling,
this can cause electrical components to burn out.
CAUTION
The heater must be installed in accordance with the country/regional
requirements & regulations. In any event the work must be carried out by a
suitably qualified electrician, who will provide a certificate of conformity
upon the completion of work. The power supply must be fitted with an RCD.
IMPORTANT SAFETY INSTRUCTIONS
When using this electrical equipment, basic safety precautions should always be followed, including the
following.
1) READ AND FOLLOW ALL INSTRUCTIONS.
2) TO REDUCE THE RISK OF INJURY:
a) The water in a pool or tub should never exceed 40°C (104°F). A water temperature more
than 40°C (104°F) is considered unsafe for all persons. Lower water temperatures are
recommended for extended use (exceeding 10-15 minutes) and for young children.
b) Excessive water temperatures have a higher potential for causing fetal damage during
the early months of pregnancy, pregnant or possibly pregnant women should limit pool or tub
water temperatures to lower than 38°C (100°F).
c) Before entering a pool or tub, the user should measure the water temperature at several
occupant locations using an accurate thermometer since the tolerance of water temperature regulating devices may vary as much as ±3°C (±5°F).
d) Alcohol, drugs or medications should not be used before or during pool or tub use since their
use may lead to unconsciousness with the possibility of drowning.
e) Obese persons and persons with a medical history of heart disease, low or high blood
pressure, circulatory system problems, or diabetes should consult a physician before using a pool
or tub.
f) Persons using medication should consult a physician before using a pool or tub since some
medication may induce drowsiness while other medication may affect heart rate, blood pressure
and circulation.
3) SAVE THESE INSTRUCTIONS FOR FUTURE REFERENCE.
WARNING
DANGER OF HYPERTHERMIA
Hyperthermia occurs when the internal temperature of the body reaches a level several degrees above
the normal body temperature of 37°C (98.6°F). The symptoms of hyperthermia include dizziness, fainting,
drowsiness, lethargy and an increase in the internal temperature of the body. The effects of hyperthermia
include:
a) Unawareness of impending hazards;
b) Failure to perceive heat;
c) Failure to recognize the need to exit pool or tub;
d) Physical inability to exit pool or tub;
e) Fetal damage in pregnant women;
f) Unconsciousness resulting in a danger of drowning.
WARNING--- The use of alcohol, drugs or medications can greatly increase the risk of fatal hyperthermia
in pools and tubs.
WARNING
Only qualified personnel in accordance with the country/regional requirements & regulations, should
install and maintain this equipment. Unauthorized alteration or improper maintenance of this unit may
release the manufacturer from any warranty claims. The installation must be in accordance with the
instructions in this manual and applicable local plumbing and electrical codes.
INTRODUCTION
Founded in 1966, Thermalec® Pool and Spa Products was the first company in Britain to manufacture a
range of electric heaters specifically for public, commercial and domestic swimming pools and spas. In
1999, Thermalec® joined the Meddings Group of Companies to enhance and diversify the latter’s
engineering activities whilst allowing Thermalec® to widen its horizons as part of a larger group. Over the
years, the Thermalec® electric pool and spa heater has been refined and today has an established name
in many areas of the world as the quality heater of first choice. The clever patented design, robust quality
and inherent reliability of the Thermalec® electric heater have earned it a position as the market leader in
Britain. Thermalec® heaters are also exported to the Middle East, the Far East and Europe, where
Thermalec® has gained the confidence of pool builders and operators as a name they can rely on.
Thermalec® pool and spa heaters are designed and built with care at our factory in the South West of
England. Our overriding objective is the application of half a century of experience, delivering to each and
every customer a quality pool heater that will give many long years of safe, efficient and economical
service.
The dedication that we apply to the design and building of a truly superlative pool heater extends further.
We exchange knowledge and experience with our partners worldwide to ensure the total satisfaction of
our customers, both installers and final users. Thermalec® engineers and technicians share their skills,
offering guidance, training and support in heater selection, installation and operation. This is particularly
for difficult applications such as sea water pools, health spas or hydrotherapy pools – areas in which the
performance of Thermalec® pool heaters are especially outstanding.
At Thermalec®, we are justly proud of our electric pool heaters. In the few pages that follow, you will find
outline details of the range and of some of the features that make Thermalec® heaters the natural quality
choice for any size or type of pool or spa. This manual provides installation procedures, operating and
maintenance instructions and a parts list for the Thermalec® Swimming Pool Heater. Your Thermalec®
Electric Swimming Pool Heater has been designed and engineered by British Engineers to provide you
with the most advanced highest quality heating system possible. Its operation is the most efficient and
pollution-free. Our models are available for every size or make of pool. To ensure a long life of troublefree service, your Thermalec® swimming Pool Heater should be carefully installed in accordance with the
instructions given in this manual. Failure to do so may damage the swimming pool heater and the pool
equipment to which it is connected. Only qualified personnel should install and maintain this unit, and, of
course, local plumbing and electrical codes have precedence over these instructions.
DESCRIPTION
The Thermalec® Swimming Pool Heater consists of titanium elements encased in a cast iron heating
vessel, the heaters upper external enclosure contains the electrical heating and control system. To help
maintain the heater to its optimum level, a brief description of its components and their operation has
been added to aid the customer. The cast iron vessel houses the elements. The vessel and heating
elements are the only components of this heater that are in contact with the water and has a unique spiral
flow of water through it, this promotes efficient heat transfer, minimizes scaling of the elements and the
build-up of sediments. The internal design of the heater prevents the direct impingement of cold pool
water onto the heating elements, reducing thermal shock, prolonging the service life. If air gets into the
heater, the unique internal weir and baffle arrangement ensures that the air is channeled harmlessly
across the top of the heater and across the unheated ends of the elements. This avoids possible element
burnout and thermal inefficiency due to wasteful heating of air. The external enclosure is a sheet steel
case totally enclosing the electrical components. The enclosure is coated with a rust inhibiting, powder
coat finish. The electrical system, which is the nerve center of the unit, can be considered as three
separate systems engineered to provide years of service and optimum use of energy. They are as
follows:
a) The heating elements; are mounted via two cold legs through a high-grade PVC plate. These
elements are made from titanium as standard and have an extremely low watts’ density due to
their design.
b) The control system; consists of the pilot switch, high limit thermostat, Pump interlock switch, a
temperature controller, magnetic contactors and sequencer (on larger units only). The controls
are wired into a control circuit designed to control the temperature of the water leaving the heater.
The high-limit thermostat is designed to open the control circuit and cut off the power in the event
of excessive temperature. A pump interlock switch is built-in to prevent the pool heater from
operating without the pump being energized, we use this because we have found flow switches to
be very unreliable.
c) The main current-carrying components; are the contactors. They are wired into the circuits which
carry the full amperage of the elements. The contactors open during a high temperature condition
to de-energize the elements. The heater has a temperature controller adjustable up to 45°C
(113°F) and has one manual reset type high temperature limit thermostat set at 48°C (118°F).
Installation: Location
Thermalec swimming pool heaters are quiet, do not emit exhaust fumes and may be conveniently located
in a shed or basement. Normal positioning of the pool heater should be near the pool filtration system.
Select a location conveniently close to incoming electrical service and where excessively long piping runs
are not required. Thermalec® heaters should never be installed outside where they are susceptible to
water.
Minimum clearance:
12THR
24THR
36THR
72THR
120THR
Front
36 (914)
36 (914)
36 (914)
36 (914)
36 (914)
Left
* * * * *
Right
* * * * *
Top
14 (356)
14 (356)
16 (406)
16 (406)
16 (406)
Back
8 (203)
8 (203)
11 (279)
17 (432)
17 (432)
* Required clearance is dependent on plumbing configuration used.
- Dimensions: Inches (mm)
- Temperature control is located on the front of the unit.
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