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Operating Principles
Refrigerant Circuit
Each GVAF unit has two refrigerant circuits, with one or
two centrifugal compressor per circuit. Each refrigerant
circuit includes a compressor suction and discharge service
FWD
valve, liquid line shutoff valve, removable core filter, liquid
Power supply
line sight glass with moisture indicator, charging port and
Capacities
electronic expansion valve. Fully modulating compressors
Cooling capacity on water (1)
and electronic expansion valve provide variable capacity
Heating capacity on water (2)
Fan motor
modulation over the entire operating range.
Fan power input (3)
Current amps (3)
Refrigerant Cycle
Start-up amps
Air flow
Typical refrigerant cycle on the GVAF is represented on the
minimum
pressure enthalpy diagram shown in the figure below. Key
nominal
maximum
state points are indicated on the figure. The cycle for the full
Main coil
load design point is represented in the plot.
Water entering/leaving connections
Figure 21 – Pressure enthalpy (P-h) diagram
Electric heater (accessory for blower only)
Electric power supply
Heating capacity
Hot water coil (accessory for blower only)
Heating capacity (4)
G2 filter (filter box accessory)
Quantity
Dimensions ( LxWxth)
G4 filter (filter box accessory)
Quantity
Dimensions ( LxWxth)
Condensate pump (accessory)
Water flow - lift height
Not available for FWD30 and FWD45
Sound level (L/M/H speed)
Sound pressure level (5)
Sound power level (5)
Unit dimensions
The GVAF chiller uses a shell and tube evaporator design
Width x Depth
Height
with refrigerant evaporating on the shell side and water
Shipped unit dimensions
flowing inside tubes having enhanced surfaces (state 1 to 2).
Width x Depth
The vaporized refrigerant flows into the compressor first
Height
stage through compressor inlet guide valves. The first stage
Weight
impeller accelerates the vapor increasing its temperature
Colour
Recommended fuse size
and pressure to intermediate state 3. Refrigerant vapor
Unit alone (aM/gI)
leaving the first stage compressor is mixed with cooler
Unit with electric heater (gI)
refrigerant vapor from the economizer (BPHE). This mixing
lowers the enthalpy of the vapor entering the second stage
(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
to stage 3a. The second stage impeller accelerates the vapor,
(3) At high speed with nominal air flow.
further increasing its temperature and pressure to state
(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.
point 4. De-superheating, condensing and sub-cooling are
accomplished in a micro channel condenser (state 5 and 5a).
Heat exchanger operating limits:
Liquid refrigerant either leaves the micro channel condenser
FWD:
*water temperature: max 100° C
at point 5a and a part of it flows to the Expansion valve and
*absolute service pressure: min 1 bar/max 11 bars
enters BPHE economizer at point 6 while the major part
Accessories - Hot water coil:
flows to BPHE economizer acting as an additive subcooler.
*water temperature: min. +2° C/max. 100° C
Refrigerant is cooled down to state 5c and the flow vaporized
*absolute service pressure: min 1 bar/max 11 bars
goes to the compressor economizer port at state 3.The
major part of the liquid flow goes through the expansion
valve and return to the evaporator at state 1.
4
42
Technical Data
Refrigerant
GVAF use R134a / R513A or R1234ze(E), Trane believes
08
that responsible refrigerant practices are important to
(V/Ph/Hz)
the environment, our customers, and the air conditioning
(kW)
5,2
industry. All technicians who handle refrigerants must be
(kW)
6,3
properly qualified. All local and EU regulations in which
(type)
R134a / R513A / R1234ze(E) are specified as medium
(kW)
0,23
pressure refrigerant must be observed. Handling,
(A)
1,1
reclaiming, recovering and recycling instructions must be
(A)
3,2
followed. R1234ze(E) requires specific care and dedicated
(m
/h)
490
3
refrigerant hoses and recovery system have to be used.
(m
/h)
820
3
(m
/h)
980
3
Compressor
(type)
The centrifugal oil free compressor with frictionless
(Dia)
3/4"
magnetic bearings is a semi hermetic design with twin
(V/Ph/Hz)
230/1/50
impellers. It has a 3 phase AC voltage input with built in
(kW)
2/4
service inverter for motor speed control.
Compressor control, motor control, motor cooling control
(kW)
6,3
and bearing control are handled by embedded electronics.
2
Sensor rings check shaft position 8000 times per second
(mm)
386x221x8
and most of the work is done by permanent magnets while
electromagnets are used to fine tune the shaft position
-
within less than 10µm of correction.
(mm)
-
(type)
(l/h - mm)
Condenser and Fans
The air cooled Microchannel condenser coils use all
(dB(A))
36/40/43
aluminum brazed fin construction.
(dB(A))
46/50/53
The coil is composed of three components: the flat
microchannel tube, the fins located between the
(mm)
890 x 600
(mm)
250
microchannel tubes, and two refrigerant manifolds. Coils
can be cleaned with high pressure water (see Condenser
(mm)
933 x 644
Coils MCHE maintenance for instructions).
(mm)
260
The condenser coil has an integral subcooling circuit. The
(kg)
32
maximum allowable working pressure of the condenser is
25.0 bars. Condensers are factory proof and leak tested at 45
(A)
8/16
bars.
(A)
16 (2kW),25 (4kW)
Direct-drive vertical-discharge airfoil condenser fans are
dynamically balanced.
Evaporator
The evaporator is a shell and tube heat exchanger design
constructed from carbon steel shells and tube sheets with
internally and externally finned seamless copper tubes
mechanically expanded into the tube sheets. Tubes are
cleanable with dismountable water boxes. Tubes diameter
exterior is 19mm. Each tube is individually replaceable.
The evaporator is designed, tested and stamped in
accordance with PED 97/23/EC or 2014/68/EU Pressure
regulation for a refrigerant side working pressure of 14 bars.
Standard water connections are grooved for Victaulic style
pipe couplings. Water boxes are available in 1 or 2 passes
configurations according to unit size and include an air
vent, a drain and fittings for temperature control sensors.
Evaporator is insulated with closed cell insulation.
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
CTV-SVX009D-GB
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