Trane GVAF Series Installation Operation & Maintenance page 50

Periodic Maintenance
Refrigerant Management
Proper refrigerant charge is essential for proper unit
operation, unit performances, and environmental protection.
Only trained and licensed service personnel should service
FWD
the chiller.
Power supply
Capacities
Some of the symptoms of a refrigerant under-charged unit:
Cooling capacity on water (1)
• Larger-than-normal evaporator approach temperatures
Heating capacity on water (2)
Fan motor
(leaving water temperature – saturated evaporator
Fan power input (3)
temperature). If the refrigerant charge is correct the
Current amps (3)
approch temperature is between 1°C and 1.5°C on circuit
Start-up amps
Air flow
1 and between 2°C and 2.5°C on circuit 2.These values are
minimum
given for units running at full load and with water without
nominal
antifreeze
maximum
Main coil
• Low Evaporator-refrigerant temperature limit
Water entering/leaving connections
• Low Refrigerant-Temperature cutout diagnostic
Electric heater (accessory for blower only)
• Fully-open expansion valve
Electric power supply
Heating capacity
• Possible whistling sound coming from liquid line
Hot water coil (accessory for blower only)
(due to high vapor velocity)
Heating capacity (4)
G2 filter (filter box accessory)
• Possible low discharge superheat at high loads
Quantity
• High condenser + Subcooler pressure drop
Dimensions ( LxWxth)
Some of the symptoms of a refrigerant over-charged unit
G4 filter (filter box accessory)
Quantity
• Condenser Pressure Limit
Dimensions ( LxWxth)
• High –Pressure Cutout diagnostic Condensate pump (accessory)
Water flow - lift height
• More-than-normal number of fans running
Not available for FWD30 and FWD45
Sound level (L/M/H speed)
• Erratic fan control
Sound pressure level (5)
Sound power level (5)
R134a/R513A/R1234ze(E) Field –
Unit dimensions
Width x Depth
Charging Procedure
Height
Shipped unit dimensions
Width x Depth
This procedure should be followed when the unit is
Height
empty of all refrigerant and under vacuum. Add the
Weight
charge through the evaporator service valve.
Colour
Recommended fuse size
1. Respect refrigerant type on the nameplate.
Unit alone (aM/gI)
Unit with electric heater (gI)
2. Note the weight of the amount of charge removed.
Compare it to the nameplate value. A difference in
(1) Conditions: Water entering/leaving temperature: 7/12 °C, Air inlet temperature 27/19°C DB/WB - Nominal air flow
charge may indicate a leak.
(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.
3. Attach the charging hose to the evaporator service valve
(4) Water entering/leaving temperature 90/70 °C, air inlet temperature 20 °C DB, Nominal air flow.
(9mm [3/8inch] flare). Open the service valve.
(5) A rectangular glass wool duct 1m50 long is placed on the blower.The measurement is taken in the room containing the blower unit.
4. Add charge to the evaporator to bring the total circuit
Heat exchanger operating limits:
charge up to the level indicated in the unit nameplate.
FWD:
5. Close the service valve and disconnect the charging
*water temperature: max 100° C
*absolute service pressure: min 1 bar/max 11 bars
hose.
Important notice:
Accessories - Hot water coil:
*water temperature: min. +2° C/max. 100° C
-Do not use recycled refrigerant as it may contain oil, which
*absolute service pressure: min 1 bar/max 11 bars
can affect system reliability. The refrigerant should be pure
and stored in virgin containers
- Hoses should be free of oil
50 4
Technical Data
Chiller settings
Prior starting refrigerant charge optimization, the
technician must insure the following chiller conditions:
• Constant water flow on a air purged circuit is strictly
08 necessary during the whole operation (water fl ow to be
(V/Ph/Hz)
within allowed operating range)
(kW) 5,2 • A fully loaded chiller is highly recommended for a
(kW) 6,3
successful operation. In case the technician is not able
(type)
to ensure a 2 circuit fully loaded chiller then he must
(kW) 0,23
lockout one circuit and perform charge optimization for
(A) 1,1
(A) 3,2
1 circuit at a time
• When the refrigerant charge optimization is done per
(m /h) 490
3
(m /h) 820
circuit the chiller load must not be lower than 60%
3
(m /h) 980
3
This procedure should be followed when adding
(type)
(Dia) 3/4" refrigerant to an undercharged unit:
1.
(V/Ph/Hz) 230/1/50
(kW) 2/4
2.
(kW) 6,3
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
This procedure should be followed when removing
refrigerant to an overcharged unit:
(mm) 933 x 644
(mm) 260
1.
(kg) 32
2. Adjust water flow within operating range and keep it
(A) 8/16
(A) 16 (2kW),25 (4kW)
12
230/1/50
8,3
11,9
2 x direct drive centrifugal
0,46
2,2
5,5
980 1400
1650 2300
1970 2600
ISO R7 rotating female
3/4" 1 1/2"
Attach the charging hose to the evaporator service
230/1/50 or 400/3/50 400/3/50
valve (9mm [3/8inch] flare). Open the service valve.
8
Fix the leaving water set point (water temperature to be
12
steady as much as possible).
Adjust water flow within operating range and keep it
2
steady.
486x271x8 586x321x8
a) Note approach temperature T1
2
b) Add 2kg of R134a or R1234ze(E) refrigerant
486x264x48 586x314x48
Centrifugal
c) Note approach temperature T2
24 - 500
d) If Tn - Tn+1 < 0.2 (with n=1 → charge addition
count) then charge is good and optimization is done
38/41/44 46/50/53
e) If Tn - Tn+1 > 0.2 (with n=1 → charge addition
48/51/54 56/60/63
count) then perform steps b) to e) if needed
1090 x 710 1290 x 820
300
1133 x 754 1333 x 864
310
Fix the leaving water set point (water temperature to
46
be steady as much as possible)
galvanised steel
8/16
steady
40 (230V),3*16 (400V) 3*20
a) Note approach temperature T1
b) Remove 2kg of R134a or R1234ze(E) refrigerant
c) Note approach temperature T2
d) Keep performing step b until Tm+1
- Tm > 0.5 (with m = 1 > charge removal count)
e) Once step d) is confirmed remove 4kg of R134a or
R1234ze(E) refrigerant and note T3
f) If T1-Tn < 0.2 (with n = 3 → charge removal count)
then charge is good and optimization is done
g) If T1-Tn > (with n = 3 → charge removal count) then
perform step e) to f) if needed
20 30
15 18,8 30,1
18,9 20,9 38,2
0,65 1,04 1,51
3,1 4,7
9,3 14,1 16,5
1800 2700
3000 4500
3600 5400
1 1/2" 1 1/2"
400/3/50 400/3/50
10 12
17,4 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
350 450
1333 x 1008 1333*1133
360 460
61 76
8/16 8/25 8/25
3*25 3*25
CTV-SVX009D-GB UNT-PRC002-GB
45
5,5
12
2
2
650
660
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