Carrier AQUASNAP 30RBP Installation, Operation And Maintenance Instructions page 88
Air-cooled liquid chillers, reversible heat pumps
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12 - OPTIONS
12.2.8.2 - Free cooling operation
The unit's SmartVu
TM
control maximises the use of the
Free Cooling based on the needs of the application and the climate
conditions. Once the chilled water/ambient air temperature
differential exceeds the threshold value by 1K, the SmartVu
control activates Free Cooling and adjusts the air flow rate to
optimise the unit's energy performance. If the operating conditions
permit the Free Cooling to operate on its own to meet the
requirements, the compressors are stopped. Two motorised valves
direct the chilled water to the Free Cooling coils.
Operating modes:
There are three operating modes
Summer (warm weather season): Mechanical cooling mode
The liquid chiller meets the needs traditionally using the refrigerant
circuit. The fluid bypasses the Free Cooling coils and is cooled by
the evaporator.
12.2.8.3 - General information
Corrosion protection:
With the hydraulic Free Cooling options, it is compulsory to use a glycol-based solution (EG or PG) containing corrosion inhibitors,
in order to protect the aluminium exchangers.
It is strongly recommended that the loop is analysed each year to ensure that these inhibitors are present.
The table below gives the maximum period after which it is necessary to top up the inhibitors.
Open loop operation is prohibited.
Maximum number of years between two corrosion inhibitor top-ups:
500
1000
2500
5000
10000
15000
500
1000
Total volume in
2500
the loop* (litres)
5000
10000
15000
500
1000
2500
5000
10000
15000
*
Also check the minimum volume in the standard "application data" section.
**
New EG or PG.
*** Volume too low.
Glycol 20%
Glycol 30%
Glycol 45%
*
See previous table.
88
Total number of Free Cooling coils connected to the water loop
2
4
6
3
2
***
6
3
2
>15
8
5
>15
>15
11
>15
>15
>15
>15
>15
>15
>15
>15
5
2
***
10
5
3
>15
12
8
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
7
4
***
14
7
5
>15
>15
12
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
>15
Volume of inhibitor to add
after x* years, as a proportion
to the total volume in the loop:
0,8%
1,2%
1,8%
Mid-season: Combination mode
It is possible to operate in combination Free Cooling and
mechanical cooling mode. This helps optimise Free Cooling
TM
operations while covering the system's cooling requirements.
The fluid is pre-cooled by the Free Cooling coils positioned in
series with the refrigerant circuit evaporator which finalises cooling
of the fluid.
Winter (cold weather season): Free Cooling mode
Depending on the capacity requested and the setpoint, all of the
requirements may be fulfilled by the Free Cooling in this operating
mode without the fans running, thereby ensuring optimum energy
efficiency.
8
10
12
14
Glycol 20%**
***
***
***
***
2
***
***
***
4
3
3
***
8
6
5
5
>15
11
9
>15
>15
14
Glycol 30%**
***
***
***
***
2
***
***
***
6
5
4
***
10
8
7
>15
>15
14
>15
>15
>15
Glycol 45%**
***
***
***
***
4
***
***
***
9
7
6
***
>15
12
10
>15
>15
>15
>15
>15
>15
16
18
20
22
***
***
***
***
***
***
***
***
***
***
***
***
4
4
3
3
8
7
6
6
12
11
10
9
***
***
***
***
***
***
***
***
***
***
***
***
6
5
5
4
12
11
10
9
>15
>15
14
13
***
***
***
***
***
***
***
***
***
***
***
***
9
8
7
6
>15
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14
13
>15
>15
>15
>15
24
***
***
***
3
5
8
***
***
***
4
8
12
***
***
***
6
12
>15
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