Thermalec Products
– 24THR Instruction Manual (rev 2)
Page 3 of 5
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
15kW
18kW
21kW
24kW
230V
– Single Phase (UK)
63 Amps
75 Amps
88 Amps
100Amps
400V
– Three Phase (UK)
21 Amps
25 Amps
29 Amps
34Amps
Two Phase / Split Phase
L1
L2
31 Amps
31 Amps
38 Amps
38 Amps
42 Amps
46 Amps
50 Amps
50 Amps
220V
– Single Phase (Euro)
68 Amps
82 Amps
96 Amps
109 Amps
380V
– Three Phase (Euro)
23 Amps
27 Amps
32 Amps
37 Amps
The size and specification of the cable to the heater should be decided by consulting the regulations stated in
section 2. To minimise the effects of volt-drop, the plant room should be located as close as possible to the
main electrical supply.
The supply cable enters via the removable plate at the back of the heater. The plate should be drilled out to suit
the size of cable gland used. Under no circumstances should cable be installed through the metal plate without
the use of a gland. To access the terminals, remove the heater cover and the plastic terminal cover.
All 24THR heaters are delivered configured for single-phase operation. When connecting for single phase
operation the Line conductor must be connected to the L1 terminal, which is physically larger and can accept
cables up to 35mm. The neutral and earth conductors must also be connected to the appropriate terminals.
The heater may be modified for three-phase operation by removing the two brown wires linking the L1, L2 & L3
terminals. No modification can be made for split or two phase operation, this must be specifically ordered.
It is vital that all wires are firmly terminated into each terminal; a 6mm spanner should be used to ensure that
the clamps are pulled firmly down onto the incoming cable ends. Ensure that the cable is of sufficient diameter
to ensure a good clamp is made and, if required, wind a length of copper strand around the other strands to
increase the diameter. After termination, check all the cables for tightness and replace both sets of covers.
The heater will not operate without a pump interlock supply that switches 230V ON when the filter pump is
running. The live of this supply should be connected to terminal A and the neutral to terminal B of the heater.
The supply must be taken from the last device switching the pump to ensure that the heater will switch off at
the same time as the filter pump.
This pump interlock supply can also be used to further control the operation of the heater. A timeswitch 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 detailed on drawing APH 1319, together with arrangements for an override switch allowing
the filter pump to be run continuously.
Thermalec also produce a range of Pool Control Panels, which enable pumps, heating and all other pool items
to be controlled from a single control box. All panels are made to order, to match the specific equipment.
Please contact the Sales office for more details.
COMMISSIONING
When using the heater for the first time (or after it has been isolated for the winter) it is vital that the heater is
commissioned using the correct procedure.
Failure to do so will result in serious damage to the heater.
g) Check heater circuit breakers are all OFF;
h) Check main power supply is OFF;
i)
Check filter pump is OFF;
j)
Check heater drain valve is closed;
