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Optional Free-Cooling
Chiller integrated free-cooling operation mode
The power of chiller integrated free-cooling relies on the chiller control to maximize the use of free-cooling when
outdoor temperatures are favorable. The choice between compressor refrigeration and Free-Cooling refrigeration will
be made and activated depending on three temperature measurements:
FWD
• The ambient air temperature
Power supply
Capacities
• The evaporator entering and leaving temperature
Cooling capacity on water (1)
Heating capacity on water (2)
• The chilled water set point
Fan motor
Free-cooling coils are fit in series with the evaporator, and a set of water regulation valves allows the coils to be by-
Fan power input (3)
passed when they are no longer needed due to outdoor temperatures which are favorable for free-cooling.
Current amps (3)
Start-up amps
Three operating modes can be differentiated:
Air flow
minimum
1.
Summer operation or Compressor refrigeration mode
nominal
In this operation mode, ambient temperature is higher than the temperature of the fluid entering the evaporator.
maximum
Main coil
Free-cooling is not activated, compressors are running, and control is done in function of the fan/compressor logic of
Water entering/leaving connections
operation.
Electric heater (accessory for blower only)
2.
Mid-season operation or combined refrigeration + Free-cooling mode
Electric power supply
In this operation mode, free-cooling will be enabled whenever the outdoor temperature is below the evaporator
Heating capacity
entering water temperature. The operating logic is described below. The free-cooling system operates combined with
Hot water coil (accessory for blower only)
Heating capacity (4)
the mechanical compressor refrigeration. Most of the time, free-cooling will only partially cover the required cooling
G2 filter (filter box accessory)
duty. In other words, mechanical refrigeration will complete what has already been delivered by free-cooling.
Quantity
Dimensions ( LxWxth)
3.
Winter operation or Full free-cooling mode
G4 filter (filter box accessory)
Below a certain ambient temperature, and depending on the chilled water set point requested, the entire cooling
Quantity
Dimensions ( LxWxth)
duty is delivered by the free-cooling system. Compressors do not operate, since the free-cooling coils will be able to
Condensate pump (accessory)
deliver the requested chilled water temperature. The regulation of the capacity is described in the next section. In this
Water flow - lift height
mode, only fans are running.
Not available for FWD30 and FWD45
Sound level (L/M/H speed)
Sound pressure level (5)
General information
Sound power level (5)
Unit dimensions
The chiller integrated free-cooling system fluid based consist in a set of "Macro-channels" or "Radiators" coils,
Width x Depth
fit in the same frame than the MCHE condenser coils of the chiller refrigerant circuit. Free-cooling coils will be full
Height
Shipped unit dimensions
aluminum, flat radiator design type, with low air pressure drop to avoid fan performances degradation.
Width x Depth
Free-cooling coils are fit in series with the evaporator, and a set of water regulation valves ensures the system to
Height
Weight
reach the required free-cooling capacity.
Colour
Recommended fuse size
Unit alone (aM/gI)
Unit with electric heater (gI)
(1) Conditions: Water entering/leaving temperature: 7/12 °C, Air inlet temperature 27/19°C DB/WB - Nominal air flow
(2) Conditions: Water entering/leaving temperature: 50/45 °C, Air inlet temperature 20°C DB - Nominal air flow
(3) At high speed with nominal air flow.
(4) Water entering/leaving temperature 90/70 °C, air inlet temperature 20 °C DB, Nominal air flow.
(5) A rectangular glass wool duct 1m50 long is placed on the blower.The measurement is taken in the room containing the blower unit.
Heat exchanger operating limits:
FWD:
*water temperature: max 100° C
*absolute service pressure: min 1 bar/max 11 bars
Accessories - Hot water coil:
*water temperature: min. +2° C/max. 100° C
*absolute service pressure: min 1 bar/max 11 bars
4
74
Technical Data
08
(V/Ph/Hz)
(kW)
5,2
(kW)
6,3
(type)
(kW)
0,23
(A)
1,1
(A)
3,2
(m
/h)
490
3
(m
/h)
820
3
(m
/h)
980
3
(type)
(Dia)
3/4"
(V/Ph/Hz)
230/1/50
(kW)
2/4
(kW)
6,3
2
(mm)
386x221x8
-
(mm)
-
(type)
(l/h - mm)
(dB(A))
36/40/43
(dB(A))
46/50/53
(mm)
890 x 600
(mm)
250
(mm)
933 x 644
(mm)
260
(kg)
32
(A)
8/16
(A)
16 (2kW),25 (4kW)
12
20
230/1/50
8,3
15
11,9
18,9
2 x direct drive centrifugal
0,46
0,65
2,2
3,1
5,5
9,3
980
1400
1650
2300
1970
2600
ISO R7 rotating female
3/4"
1 1/2"
230/1/50 or 400/3/50
400/3/50
8
10
12
17,4
2
2
486x271x8
586x321x8
2
2
486x264x48
586x314x48
Centrifugal
24 - 500
38/41/44
46/50/53
48/51/54
56/60/63
1090 x 710
1290 x 820
300
350
1133 x 754
1333 x 864
310
360
46
61
galvanised steel
8/16
8/16
40 (230V),3*16 (400V)
3*20
30
45
18,8
30,1
20,9
38,2
1,04
1,51
4,7
5,5
14,1
16,5
1800
2700
3000
4500
3600
5400
1 1/2"
1 1/2"
400/3/50
400/3/50
12
12
22,4
34,5
2
2
586*421*8
586*621*8
2
2
586*414*48
586*614*48
47/52/57
47/52/58
57/62/67
57/62/68
1290 x 970
1290 x 1090
450
650
1333 x 1008
1333*1133
460
660
76
118
8/25
8/25
3*25
3*25
UNT-PRC002-GB
RLC-SVX19E-GB
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