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d) 

Reverse two probes.  Controller probe is situated at the left-hand end of the element 
plate; the safety thermostat probe at the right (marked with a short length of white 
sheathing); 

e) 

Reinstate the top cover before reconnecting connecting electrical supplies. 

Pipe connections are stub flanges to suit 1 1/2" (12kW) nominal bore pipe (uPVC or ABS).  If using ABS, 
the solvent jointing compound must be suitable for both materials.  Reducers may be fitted to suit smaller 
pipes. It is not necessary to fit unions either side of the heater as the stub flanges are easily disconnected 
from the heater, by removing the nuts securing the aluminium backing flanges to the heater.  In very tight 
installations, the studs themselves may be unscrewed. It is advisable that isolation valves are fitted either 
side of the heater to allow easy removal of the heater without water loss. 

Electrical Installation 

a) Check heater label for rating to insure the heater matches your electrical supply. 

b) 

CHECK ELECTRICAL CONNECTIONS TO ALL COMPONENTS

 within the heater for tightness. 

These can become loose during shipment and handling. 

c) Check components for any moisture, rust, or dust which may have accumulated during shipping, and 
clean or dry where necessary. 

All pool heaters covered in this manual have integral thermostats, contactors and sequencers where 
required. 

Wiring diagrams included show internal wiring and required field connections for various models. Consult 
your local electrical code for proper wire and conduit sizes, and other local requirements. 

Do not connect the pool heater to, or operate at a voltage other than the voltage rated on the heater label. 

Wires of adequate size are to be fed from a fused disconnect switch or circuit breaker with an ampere 
rating of 125% of the ampere rating shown on heater label. Connect power conductors to the power 
distribution block inside the heater. All other internal connections are completed and tested at the factory. 

Overcurrent protection must also be provided in the form of a Miniature Circuit Breaker (MCB).  Due to 
the continuous high load that will be drawn, MCBs should be rated at least 20% higher than of the current 
shown below. 

 

 

 
Specific Electrical Supply 

 

 

3 kW 

 

4 kW 

 

6 kW 

230V 

– Single Phase (UK) 

 

13 Amps 

17 Amps 

25 Amps 

Two Phase / Split Phase  
 

L1 
L2 

 

 

NA 

 

NA 

13 Amps 
13 Amps 

220V 

– Single Phase (Euro) 

 

14 Amps 

19 Amps 

28 Amps 

 
 
 
 
 

Summary of Contents for 120THR

Page 1: ...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 Th...

Page 2: ...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 shou...

Page 3: ...eater 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 he...

Page 4: ...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 foun...

Page 5: ...not heat properly unless it is plumbed correctly If plastic pipe is used it should be suitable for at least 49 C 120 F A plumbing bypass around the pool heater is not necessary unless flow rate thoug...

Page 6: ...minimise scale formation 2000 gal hr 152 l min 2000 gal hr 152 l min 2000 gal hr 152 l min Soft water maximum use bypass above this rate improves element life 1000 gal hr 76 l min 1000 gal hr 76 l mi...

Page 7: ...during shipment and handling c Check components for any moisture rust or dust which may have accumulated during shipping and clean or dry where necessary All pool heaters covered in this manual have i...

Page 8: ...he heater cover and the plastic terminal cover Single phase All 12THR heaters are delivered configured for single phase operation It is vital that all wires are firmly terminated into the appropriate...

Page 9: ...her control the operation of the heater A time switch can be fitted to interrupt the supply to terminal A ensuring that it can only come on during specific periods of cheap electricity This is detaile...

Page 10: ...affected area Pool Not Reaching Desired Temperature If the status lamps are lit as described on the previous page and the contactors can be heard engaging then the heater can be said to be operating c...

Page 11: ...liable in cases of incorrect installation of the heater inappropriate use or neglect of the heater Water Quality The water quality must be within the following limits PH 6 8 8 0 TA Total alkalinity 80...

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