RLC-SVX023A
28
4
UNT-PRC002-GB
Technical Data
FWD
08
12
20
30
45
Power supply
(V/Ph/Hz)
230/1/50
Capacities
Cooling capacity on water (1)
(kW)
5,2
8,3
15
18,8
30,1
Heating capacity on water (2)
(kW)
6,3
11,9
18,9
20,9
38,2
Fan motor
(type)
2 x direct drive centrifugal
Fan power input (3)
(kW)
0,23
0,46
0,65
1,04
1,51
Current amps (3)
(A)
1,1
2,2
3,1
4,7
5,5
Start-up amps
(A)
3,2
5,5
9,3
14,1
16,5
Air flow
minimum
(m
3
/h)
490
980
1400
1800
2700
nominal
(m
3
/h)
820
1650
2300
3000
4500
maximum
(m
3
/h)
980
1970
2600
3600
5400
Main coil
Water entering/leaving connections
(type)
ISO R7 rotating female
(Dia)
3/4"
3/4"
1 1/2"
1 1/2"
1 1/2"
Electric heater (accessory for blower only)
Electric power supply
(V/Ph/Hz)
230/1/50
230/1/50 or 400/3/50
400/3/50
400/3/50
400/3/50
Heating capacity
(kW)
2/4
8
10
12
12
Hot water coil (accessory for blower only)
Heating capacity (4)
(kW)
6,3
12
17,4
22,4
34,5
G2 filter (filter box accessory)
Quantity
2
2
2
2
2
Dimensions ( LxWxth)
(mm)
386x221x8
486x271x8
586x321x8
586*421*8
586*621*8
G4 filter (filter box accessory)
Quantity
-
2
2
2
2
Dimensions ( LxWxth)
(mm)
-
486x264x48
586x314x48
586*414*48
586*614*48
Condensate pump (accessory)
(type)
Centrifugal
Water flow - lift height
(l/h - mm)
24 - 500
Not available for FWD30 and FWD45
Sound level (L/M/H speed)
Sound pressure level (5)
(dB(A))
36/40/43
38/41/44
46/50/53
47/52/57
47/52/58
Sound power level (5)
(dB(A))
46/50/53
48/51/54
56/60/63
57/62/67
57/62/68
Unit dimensions
Width x Depth
(mm)
890 x 600
1090 x 710
1290 x 820
1290 x 970
1290 x 1090
Height
(mm)
250
300
350
450
650
Shipped unit dimensions
Width x Depth
(mm)
933 x 644
1133 x 754
1333 x 864
1333 x 1008
1333*1133
Height
(mm)
260
310
360
460
660
Weight
(kg)
32
46
61
76
118
Colour
galvanised steel
Recommended fuse size
Unit alone (aM/gI)
(A)
8/16
8/16
8/16
8/25
8/25
Unit with electric heater (gI)
(A)
16 (2kW),25 (4kW)
40 (230V),3*16 (400V)
3*20
3*25
3*25
(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
Operating Principles Mechanical
Cycle Description
The refrigeration cycle for the chiller can be described
using the pressure-enthalpy diagram shown in
Figure 5. Key State Points are indicated on the figure
and are referenced in the discussion following. Typical
schematics of the system showing the refrigerant flow
loop as well as the lubricant flow loop is shown in
Figure.
Evaporation of refrigerant occurs in the evaporator that
maximizes the heat transfer performance of the heat
exchanger while minimizing the amount of refrigerant
charge required. A metered amount of refrigerant liquid
enters a distribution system in the evaporator and is
then distributed to plates in the evaporator.
The refrigerant vaporizes as it cools the water flowing
through the evaporator plates. Refrigerant vapor leaves
the evaporator as superheated vapor (State Point 1).
The refrigerant vapor generated in the evaporator flows
to the suction end of the compressor where it enters
the motor compartment of the suction-gas-cooled
motor. The refrigerant flows across the motor, providing
the necessary cooling, then enters the compression
chamber. Refrigerant is compressed in the compressor to
discharge pressure conditions. Simultaneously, lubricant
is injected into the compressor for two purposes: (1) to
lubricate the rolling element bearings, and (2) to seal the
very small clearances between the compressor’s twin
rotors.
Immediately following the compression process the
lubricant and refrigerant are effectively divided using
an oil separator. The oil-free refrigerant vapor enters
the condenser at State Point 2. The lubrication and oil
management issues are discussed in more detail in the
compressor description and oil management sections
that follow.
Cooling device water, circulating through the condenser
plates, absorbs heat from this refrigerant and
condenses it.
Refrigerant leaves the condenser as subcooled liquid and
travels to the electronic expansion valve (State Point 4).
The pressure drop created by the expansion process
vaporizes a portion of the liquid refrigerant. The resulting
mixture of liquid and gaseous refrigerant then enters the
Evaporator Distribution system (State Point 5).
The chiller maximizes the evaporator heat transfer
performance while minimizing refrigerant charge
requirements. This is accomplished by metering the
liquid refrigerant flow to the evaporator’s distribution
system using the electronic expansion valve.
A compressor suction superheat measurement provides
feedback information to the Tracer UC800 unit controller,
which commands the electronic expansion valve to
reposition when necessary.
Figure 5 – Pressure /Enthalpy Curve