Trane GVAF Series Installation Operation & Maintenance page 36

Evaporator Waterside
Freeze Protection
Depending on the ambient temperature the unit may be
exposed to freeze, there are multiple options for freeze
protection. They are listed in order of highest ambient
FWD
(least freeze protection) to the lowest ambient (most freeze
Power supply
protection).
Capacities
Cooling capacity on water (1)
For all chiller running with water under cold ambient
Heating capacity on water (2)
temperature (below 0°C), it is extremely important to keep
Fan motor
full water flow in the evaporator for an extended time
Fan power input (3)
Current amps (3)
after last compressor stops. This will protect evaporator
Start-up amps
tube from freezing by refrigerant migration. This is why
Air flow
evaporator water pump output relay must be used to
minimum
control the chilled water pump. This is not mandatory if
nominal
maximum
glycol is used with protection down to lowest ambient
Main coil
expected.
Water entering/leaving connections
1. Water pump and heaters Electric heater (accessory for blower only)
Electric power supply
Heating capacity
a. Heaters are factory installed on water boxes and
Hot water coil (accessory for blower only)
evaporator shell. They will protect it from freezing
Heating capacity (4)
in ambient temperatures down to -20°C.Heaters are
G2 filter (filter box accessory)
Quantity
installed on the water piping and on the pumps of units
Dimensions ( LxWxth)
equipped with hydraulic module.
G4 filter (filter box accessory)
b. Install heat tape on all water piping, pumps, and other
Quantity
components that may be damaged if exposed to
Dimensions ( LxWxth)
Condensate pump (accessory)
freezing temperatures. Heat tape must be designed
Water flow - lift height
for low ambient temperature applications. Heat tape
Not available for FWD30 and FWD45
selection should be based on the lowest expected
Sound level (L/M/H speed)
ambient temperature.
Sound pressure level (5)
Sound power level (5)
c. Tracer™ UC800 controller can start the pump(s) when
Unit dimensions
freezing conditions are detected. For this option the
Width x Depth
pumps must be controlled by the GVAF unit and this
Height
function validated on the chiller controller.
Shipped unit dimensions
Width x Depth
d. Water circuit valves need to stay open at all times.
Height
Weight
Note: Water pump control and heater combination will
Colour
protect the evaporator down to any ambient temperature
Recommended fuse size
Unit alone (aM/gI)
provided power is available to the pump and the UC800
Unit with electric heater (gI)
controller. This option will NOT protect the evaporator
in the event of power failure to the chiller unless backup
(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
power is supplied to the necessary components.
(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.
Note: When no chiller operation is possible and the pump
is already off, UC800 pump control function for freeze
Heat exchanger operating limits:
FWD:
protection will command the pump to turn on:
*water temperature: max 100° C
*absolute service pressure: min 1 bar/max 11 bars
• ON if the average of the evaporator entering water
Accessories - Hot water coil:
temperature, evaporator leaving temperature, and the
*water temperature: min. +2° C/max. 100° C
evaporator refrigerant pool temperature is less than
*absolute service pressure: min 1 bar/max 11 bars
Low Evaporator Refrigerant Temperature Cutout (LERTC) +
2.2°C for a period of time
• OFF again if the evaporator refrigerant pool temperature
rise above LERTC + 3.3°C for a period of time
Note: The period of time referenced for ON and OFF
conditions above described is dependent on past running
conditions and present temperature measured.
• ON if entering OR leaving water temperature < LWTC for
16.2°C-sec
• OFF again if water temperature > LWTC for 30 min
4 36
Technical Data
08
2. Freeze inhibitor
(V/Ph/Hz)
a. Freeze protection can be accomplished by adding
(kW) 5,2
(kW) 6,3
(type)
(kW) 0,23
b. See "evaporator glycol requirement" section for
(A) 1,1
(A) 3,2
(m /h) 490
3
Note: Use of glycol type antifreeze reduces the cooling
(m /h) 820
3
capacity of the unit and must be considered in the design
(m /h) 980
3
of the system specifications.
(type)
(Dia) 3/4"
(V/Ph/Hz) 230/1/50
(kW) 2/4
3. Drain water circuit
(kW) 6,3
For ambient temperatures below -20°C and for those
installation not including either option 1 or 2 above
2
(mm) 386x221x8
described
a. Shut off power supply to unit and to all heaters.
-
b. Purge the water circuit
(mm) -
c. Blow out the evaporator to ensure that no liquid is left
(type)
(l/h - mm)
(dB(A)) 36/40/43
(dB(A)) 46/50/53 CAUTION! Evaporator damage!
If insufficient concentration or no glycol is used, the
(mm) 890 x 600
evaporator water pumps must be controlled by the UC800
(mm) 250
to avoid severe damage to the evaporator due to freezing.
(mm) 933 x 644
A power loss of 15 minutes during freezing can damage
(mm) 260
the evaporator. It is the responsibility of the installing
(kg) 32
contractor and/or the customer to ensure that a pump will
start when called upon by the chiller controls.
(A) 8/16 Please consult the table named "Recommended Low
(A) 16 (2kW),25 (4kW)
Evaporator Refrigerant Cutout (LRTC) and % Glycol for
GVAF chillers" .
With factory-fitted disconnect switch option, evaporator
trace heating is taken from the live side of the isolator. As
a consequence, the heaters are energized as long as the
main switch is closed. Supply voltage to the heating tapes
is 400V.
The warranty will be void, in case of freezing due to the
lack of use of either of these protections.
Low Refrigerant Cutout - LRTC
The minimum leaving water temperature cutout is set
at 2.2°C and the Low Refrigerant Temperature cutout is
set at 0°C.
CAUTION!
1. Additional glycol beyond the recommendations will
2. If additional glycol is used, then use the actual % glycol
3. With glycol application, ensure that there is no
OR
12
230/1/50
8,3
sufficient glycol to protect against freezing down to the
11,9
2 x direct drive centrifugal
lowest ambient expected.
0,46
2,2
guidance on determining the glycol concentration.
5,5
980
1650
1970
ISO R7 rotating female
3/4"
OR
230/1/50 or 400/3/50 400/3/50
8
12
2
486x271x8 586x321x8
2
486x264x48 586x314x48
Centrifugal
24 - 500
inside the evaporator and the water lines. Drain the
pump.
38/41/44 46/50/53
48/51/54 56/60/63
1090 x 710 1290 x 820
300
1133 x 754 1333 x 864
310
46
galvanised steel
8/16
40 (230V),3*16 (400V)
adversely affect unit performance. The unit efficiency
will be reduced and the saturated evaporator
temperature will be reduced. For some operating
conditions this effect can be significant.
to establish the low refrigerant cutout set point.
fluctuation of brine flow versus Order Write Up
value, as a reduction of flow will adversely affect unit
performance and behaviour.
20 30
15 18,8
18,9 20,9
0,65 1,04
3,1 4,7
9,3 14,1
1400 1800
2300 3000
2600 3600
1 1/2" 1 1/2" 1 1/2"
400/3/50 400/3/50
10 12
17,4 22,4
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
350 450
1333 x 1008 1333*1133
360 460
61 76
8/16 8/25
3*20 3*25
UNT-PRC002-GB CTV-SVX009D-GB
45
30,1
38,2
1,51
5,5
16,5
2700
4500
5400
12
34,5
2
2
650
660
118
8/25
3*25