CHILLER 607NT-608NT User manual N - REV20160118_EN.docx
Page 8 of 18
If two or more units are connected in parallel a manifold with balancing valves is required. It is
mandatory when using a manifold to assure the correct water flow to each unit, as follows:
Chiller / Heat
Fresh water flow (m3/h)
Pipe inner
Sea water flow (m3/h) Pipe inner
Pump unit
min
MAX
Ø mm
min
MAX
Ø mm
607NT
1.5 2.5 25 1.2 1.8
20
608NT
2.0 3.0 25 2.4 3.6
25
Chiller / Heat
Fresh water flow Pressure drop
Sea water flow
Pressure drop
(m3/h)
Fresh water (kPa)
(m³/h)
Sea water (kPa)
607NT
1.5
30
1.3
60
608NT
2.0
38
2.5
50
1.
Sea water circulation.
Before starting the unit check that the water flow is correct, without any
air bubble inside the circuit; pumps shall be located below the water line at all times, as they
are not self-priming. Operation with poor water circulation can damage the compressor due
to abnormal working pressure. Check weekly the sea water flow, considering the flow
requirements indicated in the above table.
2.
Clean your strainer weekly or more, depending on the region, due to the presence of jellyfish,
seaweed, sand, and anything else that can clog strainers very quickly. Pump is not self-priming
and it has to be installed below the water line with the outlet pointed upward so that if air
enters the system it can pass through the pump. Damage incurred due to a pump running dry
is not covered under warranty.
3.
Sea water pump must be sized so that medium water velocity inside the coil is between 2 m/s
and 3 m/s. Higher velocity may cause metal erosion while lower velocity may cause coil
clogging.
Fresh water
INLET
Fresh water
Filter
Sea water
Zinc anod
Sea water
OUTLET
Fresh water
OUTLET
Sea water
INLET