Carel HB200C0300CE0, Руководство пользователя, Страница: 22 / 32

22
ENG
Heos BOX R704
+0300140EN - rel. 1.0 - 25.05.2022
cause malfunctions. The water circuit must be thoroughly cleaned of
any processing residues (shavings, dust, etc.) before being connected
to the unit. The flow of water into the condenser must not contain any
impurities that may obstruct the condenser and affect operation of the
unit. It is recommended to install an inspectable “Y” filter at the inlet to
each condenser to ensure adequate protection. It is recommended to
use a filter with the same diameter as the piping (1”) and with a filtration
capacity of at least 400 μm or finer. Regular maintenance must be
performed on the inspectable filter so as to ensure correct operation of
all the units connected to the water loop. The diameter of the water loop
piping and the pressure head at the inlet to each individual HEOS BOX
unit must be sized so as to ensure a water flow-rate at the condenser inlet
in compliance with the nominal flow-rate stated in this document under
“TECHNICAL SPECIFICATIONS”.
All the units have been designed to give a water-side pressure drop of
between 20-25 kPa, so as to simplify installation in a loop with multiple
units connected in parallel. By maintaining a pressure drop of 20-25 kPa
between the condenser inlet and outlet on each unit, the water flow-
rate to the condenser is certain to be approximately equal to the value
required for correct operation of the unit, as declared in the “TECHNICAL
SPECIFICATIONS”.
The installer is responsible for the correct construction and balancing of
the water circuit. Carel Industries S.p.A. declines all liability for water loop
installations that do not comply with the aforementioned instructions and
in such cases does not guarantee correct operation of the unit.
4.3 Feedwater specifications
The HEOS box units are designed to work with mains water mixed with
ethylene glycol (antifreeze additive), with a concentration in proportion to
the total volume of the water loop equal to:
• Nominal*: 20%;
• Maximum: 50%.
Notice: (*) reference percentage for unit performance shown in the
“TECHNICAL SPECIFICATIONS”.
The antifreeze additive:
• it is a necessary precaution if the water loop is served by a dry cooler
and the outside temperature drops below 0°C.
• It is mandatory for systems that use chillers to cool the water loop.
• It is good practice to use antifreeze to prevent corrosion and ensure
constant water circuit performance over time.
• It is possible to use inhibited propylene glycol with a maximum
concentration of 52% by volume. As propylene and ethylene glycol
have different thermal properties, performance of the HEOS BOX unit
may differ from the values shown in the “TECHNICAL SPECIFICATIONS”.
Caution: read the safety and technical data sheet for the antifreeze
additive before handling the fluid and adding it to the water circuit.
4.4 Refrigerant connections
Refer to Figure 4.a.
Caution: before continuing, make sure the unit is powered off,
placing disconnect switch QS1 and the switch or disconnect device on the
HEOS BOX power supply line in the OFF position (see the wiring diagram).
The mains power disconnect device must have a contact opening
distance that allows complete disconnection in overvoltage category III
conditions; it must also be incorporated into the HEOS BOX power supply
line in accordance with national regulations. The refrigerant connections
supplied are stubs of bare copper pipes with variable diameter and
thickness, depending on the size of the unit. It is good practice to use
copper pipes of the same type and with the same diameter as those
coming out of the unit, avoiding differences in diameter of more than one
size.
CE versions
Model
From the evap-
orator (suction
line)
To the evapo-
rator
(liquid
line)
Safety valve
outlet
(to be piped)
HB200C0300CE0 diam. 10 x 1 mm diam. 8 x 1 mm 3/8” G (male)
HB200C0400CE0 diam. 10 x 1 mm diam. 8 x 1 mm 3/8” G (male)
HB200C0600CE0 diam. 12 x 1 mm diam. 8 x 1 mm 3/8” G (male)
HB200C1000CE0 diam. 12 x 1 mm diam. 8 x 1 mm 3/8” G (male)
Tab. 4.b
The unit must be connected to the evaporator section via refrigerant
piping in a workmanlike manner, by qualified operators using braze
welding. The piping must be securely fixed and not transmit vibrations to
the HEOS BOX unit.
Connection procedure
1. Wear all personal protective equipment needed to complete the
connection procedure: gloves, protective glasses and safety shoes.
2. Make sure the unit is powered off, placing disconnect switch QS1 and
the switch or disconnect device on the HEOS BOX power supply line
in the OFF position (see the wiring diagram).
3. Make sure that the unit is firmly anchored to the system it is part of,
using all of the “L” brackets at the base of the structure.
4. Open the refrigerant circuit cover panel.
5. Check the pressure in the circuit, which should be about 1 bar.
6. Expel the inert gas (nitrogen) from inside the unit. Use the pressure
ports (pos. 3, 17 and 22) arranged on the suction side, on the
compressor side and on the liquid line. Take care to avoid any danger
of materials and/or fluids being expelled outside of the unit.
7. Pipe the output of the safety valve to ensure safe discharge of the
refrigerant fluid should the valve open.
8. Remove the two plugs on the refrigerant inlet and outlet pipes.
9. Cover the structure with a metal screen so as to not damage the paint.
10. Cover the refrigerant shut-off valves with a wet rag (pos. 18 and 21) to
avoid overheating that would damage them.
11. Connect to the two refrigerant pipes, inlet (pos. 20) and outlet (position
19) to the rest of the refrigerant circuit by braze welding.
12. Open the two shut-off valves located near the refrigerant inlet and
outlet pipes (pos. 18 and 21).
13. After braze welding the refrigerant circuit, charge the circuit with
nitrogen to a maximum pressure of 40 barg (580 psi) and check that
there are no leaks by measuring the pressure with a pressure gauge or
other suitable instruments.
The HEOS BOX unit cannot be connected to the evaporating system using
any other type of connection from that specified, otherwise the warranty
will be void.