Dantherm HPP Serie Manual De Instalación página 8

EN
Recommended plumbing
schematic
Determining the water flow
Electrolytic corrosion
8
Recommended plumbing schematic
Water outlet
To waste for
Water inlet
winterising
drain down
Bypass valve
normally shut
Anti return loop to
be incorporated
Minimum height
100mm above heat
Key
pump outlet port
( If sanitiser tted)
Breakable
coupling
The HPP heat pump is fitted with a water flow switch which inhibits the operation of the unit when the
water flow is less than that shown in the table below.
HPP Heat pump Minimum flow rate
6 2400L/hour
8 3360L/hour
12 4320L/hour
15 5760L/hour
20 7200L/hour
Error code PL on the user interface will be shown until the correct flow rate is achieved.
Once this error code is extinguished the flow rate is adequate.
See Technical data for HPP for correct water pressure drop.
Electrolytic corrosion will occur when dissimilar metals that are in contact with each other create a
potential difference (voltage) between them. Sometimes, when separated by a conductive substance
known as an electrolyte, the dissimilar metals will create a small voltage that allows the ions of one
material to pass to the other.
Similar to a battery, ions will pass from the most positive material to the more negative material.
A voltage of more than 0.3 volts can cause the most positive material to degrade.
A swimming pool with its associated equipment can create this effect. The pool water being an ideal
electrolyte and components of the filtration circuit, heating system, steps, lights etc. providing the
dissimilar metals needed to complete the circuit.
Whilst these small voltages are rarely a safety threat, they can create premature failure through corrosion.
Not dissimilar to corrosion through oxidation, electrolytic corrosion can cause complete failure of a metallic
material in a very short period of time.
In order to prevent this type of corrosion all metallic components in contact with swimming pool water
should be bonded together using 10mm² bonding cable. This includes non-electrical items such as
metal filters, pump strainer boxes, heat exchangers, steps and handrails. It is strongly recommended that
bonding be retrofitted to existing pools, which may not be protected by this system.
Pressure gauge
Condensate
water to waste
To waste
Isolation valve Non return Three way
valve valve
Filter
Spare port for
winterising ushing
Pump
connection