FRIGOMAR ENG - CU50VFD-CU70VFD 20190108.doc81218 Page 10 of 24
Installation example with Calpeda pump:
Calpeda Pump
Q min
H max
Q max
H min
Input
power
Weight
Pump unit
(m3/h)
(m)
(m3/h)
(m)
(W)
(Kg)
B / CM 20E at 50Hz
1.5
10.5
4.8
5
370
6.8
B / CM 20E at 60Hz
1.5
12.3
4.8
9
370
6.8
B / CM 22/1E at 50Hz
1.5
13.5
5
9.5
450
8.3
B / CM 22/1E at 60Hz
1.5
19.5
4.8
15.3
450
8.3
B / CM 22/E at 50Hz
1.5
15
6.6
6.5
550
8.3
B / CM 22/E at 60Hz
1.5
20.5
4.8
16
550
8.3
B / CM 41/1E-R at 50 Hz
4
12
12
7.5
750
17.9
B / CM 41/1E-R at 60 Hz
4.8
16.5
15
8
750
17.9
Chiller / Heat
Best choice for 1 chilling
unit
Best choice for 2 chilling
unit
Best choice for 3 chilling
unit
Pump unit
Fresh water
Sea water
Fresh water
Sea water
Fresh water
Sea water
CU50VFD
CM 20E
BCM 20E
CM22/1E
BCM22/1E
-
-
CU70VFD
CM22/1E
BCM 20E
CM22/E
BCM22/E
CM41/1E
BCM41/1E
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.
WARNING!
Air conditioning unit must be overseen (also through suitable protection devices) as
any eventual breaking of fittings or pipes carrying seawater may have disastrous effects on the
boat (from room engine flooding to boat sinking, considering the seawater flow through the
unit ranges from 2 to 4 m3/h).
1.
Fresh water to fan coils.
Filling the system for the 1st time, a 10-20% percentage of glycol must
be added to the fresh water, and then this proportion must be maintained along the system’s
life. Assure the fresh water circuit is clean before filling it. Should water contain parts bigger
than 0.8 mm a 16-20 mesh filter must be installed upstream the exchanger inlet, before the
fresh water inlet. Check regularly that the filter is not clogged.
2.
Before starting the unit check that water circulation is correct. After a shut-down you are
advised before starting the pumps to rotate manually the pump shaft (2-3 rounds).
3.
Air-conditioning system shall not be used during navigation as long as seawater conditions or
boat high speed could unprime the pump.
4.
All the hydraulic lines, including the unit, must be kept free from water following system shut-
down, whenever the ambient temperature could go below 0°C
3.7 MAINTENANCE
(Only qualified technicians can perform maintenance)
1.
Check at least once a year, after shutting off the main breaker, the state of all the electrical
connections and circuit breakers of the air conditioning system, cleaning and repairing as
necessary. These devices are exposed to salty air and suffer over time from corrosion and
