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Chilled/hot water Piping
Minimum/recommended water
content
The water volume is an important parameter because it
permit several things:
FWD
1.
It avoids short cycle operation of the compressors.
Power supply
Parameters which influence the minimum
Capacities
compressor running time
Cooling capacity on water (1)
Heating capacity on water (2)
Water loop volume
−
Fan motor
Load fluctuation
−
Fan power input (3)
Current amps (3)
Number of capacity steps
−
Start-up amps
Compressors rotation
−
Air flow
Dead band (adjustable on unit controller)
−
minimum
Minimum running time of a compressor
nominal
−
maximum
2.
On both chilled and hot water loops, it permits to
Main coil
smooth water temperature fluctuations leaving the
Water entering/leaving connections
CMAF unit whilst a circuit transitions from a mode to
Electric heater (accessory for blower only)
another.
Electric power supply
3.
On hot water loop it permits to keep a leaving
Heating capacity
Hot water coil (accessory for blower only)
temperature hot enough when defrosting cycles
Heating capacity (4)
occur :
G2 filter (filter box accessory)
Assures the unit to defrost both circuits in a row
Quantity
−
Dimensions ( LxWxth)
Assures continuous operation and to run
−
G4 filter (filter box accessory)
Exchangers the most effective way.
Quantity
For chilled water loop, the minimum water content shall
Dimensions ( LxWxth)
be in accordance with point 1.
Condensate pump (accessory)
Water flow - lift height
For hot water loop, the minimum water content shall be
Not available for FWD30 and FWD45
the maximum of recommendations #1 and #2.
Sound level (L/M/H speed)
Sound pressure level (5)
1. Avoid short-cycles
Sound power level (5)
Unit dimensions
For comfort application, we can allow water temperature
Width x Depth
fluctuation at part load. The parameter to take into
Height
Shipped unit dimensions
account is the minimum operating time of the
Width x Depth
compressor. In order to avoid lubrication problem on a
Height
scroll compressor it must run at least 2 minutes
Weight
(120 seconds) before it stops.
Colour
Recommended fuse size
The minimum volume can be determined by using the
Unit alone (aM/gI)
following formula:
Unit with electric heater (gI)
(maximum unit capacity x time x step_high)
Volume =
(1) Conditions: Water entering/leaving temperature: 7/12 °C, Air inlet temperature 27/19°C DB/WB - Nominal air flow
(specific heat x dead band)
(2) Conditions: Water entering/leaving temperature: 50/45 °C, Air inlet temperature 20°C DB - Nominal air flow
With :
(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.
•
Maximum unit capacity (kW) at full load
(5) A rectangular glass wool duct 1m50 long is placed on the blower.The measurement is taken in the room containing the blower unit.
•
time (seconds),120s minimum operating time
Heat exchanger operating limits:
FWD:
(largest compressorTonnage)
*water temperature: max 100° C
•
step
(%),
*absolute service pressure: min 1 bar/max 11 bars
high
(unit tonnage)
•
Accessories - Hot water coil:
specific heat (kJ/kg) e.g.4.18 for water
*water temperature: min. +2° C/max. 100° C
•
dead band (K) (default value see Table 9)
*absolute service pressure: min 1 bar/max 11 bars
4
34
Technical Data
Table 8 – Brine specific heat (kJ/kg) at 30% concentration
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)
Table 9 - Default Dead band and highest compressor step
(Dia)
3/4"
(V/Ph/Hz)
230/1/50
(kW)
2/4
Highest Step
Default Dead
(kW)
6,3
2
(mm)
386x221x8
Highest Step
-
(mm)
-
Default Dead
(type)
(l/h - mm)
Note: To estimate the capacity, it is recommended
(dB(A))
36/40/43
to make a selection at full load according ambient
(dB(A))
46/50/53
temperature which the needs are the lowest and the unit
(mm)
890 x 600
cooling/heating capacities the highest, e.g.
(mm)
250
•
(mm)
933 x 644
(mm)
260
•
(kg)
32
It is also essential to take into account the brine specific
(A)
8/16
heat, in case of the use of glycol refer to Table 6.
(A)
16 (2kW),25 (4kW)
Process applications will need more water volume to
minimize the water temperature fluctuation at part load.
2. Coil defrosting
When the unit is running in heat pump mode with
ambient air temperature below +7°C coils may be subject
to ice formation. The unit controller can initiate a defrost
cycle to melt the ice in order to recover a reasonable
capacity.
In case ambient air will not drop below +7°C
recommendations below do not apply.
The leaving temperature may be colder during few
minutes defrosting and shall be mixed into a buffer tank.
Temperature
Propylene
(°C)
Glycol
-10
4.80
12
0
4.44
230/1/50
10
4.18
8,3
20
4.00
11,9
2 x direct drive centrifugal
30
3.86
0,46
40
2,2
3.72
5,5
50
3.55
980
1400
60
3.31
1650
2300
70
2.96
1970
2600
ISO R7 rotating female
3/4"
1 1/2"
Unit Size
080
090
230/1/50 or 400/3/50
400/3/50
8
25%
27%
12
Band
2
Unit Size
140
150
486x271x8
586x321x8
18%
17%
2
486x264x48
586x314x48
Centrifugal
Band
24 - 500
38/41/44
46/50/53
48/51/54
56/60/63
1090 x 710
1290 x 820
300
The lowest ambient air temperature for cooling
mode
1133 x 754
1333 x 864
310
The highest ambient air temperature for heat pump
46
mode.
galvanised steel
8/16
40 (230V),3*16 (400V)
3*20
Ethylene
Glycol
4.30
20
30
4.22
4.07
15
18,8
30,1
3.87
18,9
20,9
38,2
3.65
0,65
1,04
1,51
3,1
4,7
3.41
9,3
14,1
16,5
3.18
1800
2700
2.97
3000
4500
2.80
3600
5400
1 1/2"
1 1/2"
100
110
130
400/3/50
400/3/50
10
12
25%
29%
25%
17,4
22,4
34,5
1.8
2
2
165
180
190
586*421*8
586*621*8
20%
18%
17%
2
2
586*414*48
586*614*48
1.3
47/52/57
47/52/58
57/62/67
57/62/68
1290 x 970
1290 x 1090
350
450
1333 x 1008
1333*1133
360
460
61
76
8/16
8/25
8/25
3*25
3*25
UNT-PRC002-GB
CG-SVX051A-GB
45
5,5
12
2
2
650
660
118
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