Actron PKY470T User manual

1
ActronAir is constantly seeking ways to improve the design of its products, therefore specifications are subject to change without notice.
Copyright © 2015 Actron Engineering Pty. Ltd.
Table of Contents
01. Information ..............................................................................................................2
02. R-410A Refrigerant Reclaim Procedure .....................................................................2
03. Installing The New Thermal Expansion Valve............................................................2
04. Recharging the System / Operation Preparation for Unit Start-Up............................ 5
TXV REPLACEMENT - PACKAGE UNIT

TXV REPLACEMENT - PACKAGE UNIT
2Tri-Capacity Package - TXV Replacement
Doc. 9590-2014-19B Ver. 3 211105
01. Information
To replace the Thermal Expansion Valve (TXV) of the unit, it is necessary to first reclaim the R-410A refrigerant from the
system before proceeding with the required task. To do this, it is important that refrigerant reclaim procedures to be
carried out in accordance with Australia and New Zealand refrigerant handling code of practice. Particularly observe
the notes and important information described below to safely replace the affected TXV:
NOTES
• The units covered in this manual have two independent circuits, i.e. Circuit # 1 (small comp) and Circuit # 2 (large
comp). Working on one of the circuits will not affect the other.
• When performing TXV replacement process, ensure to correctly identify and work only in the components of the
affected Circuit.
CAUTION
• Never allow R-410A refrigerant to vent into the atmosphere. It is an offence to do so here in Australia.
Always reclaim refrigerant using equipment and container dedicated for R-410A system use only.
• Only licensed trades personnel must perform any work related to addition or removal of refrigerant.
• R-410A refrigerant has POE oil that rapidly absorbs moisture.
The maximum time any system can be opened to atmosphere is 15 minutes.
02.R-410A Refrigerant Reclaim Procedure
1. Connect gauges as per procedure in fitting of refrigerant gauges.
2. Remove caps off from reclaim fittings.
3. Connect reclaim unit to gauge manifold charging port on inside of unit.
4. Connect container cylinder to reclaim unit outside.
5. Open gauge ports and hose ball valve.
6. Open refrigerant cylinder and start the unit.
7. Observe gauge readings until they hold at zero pressure or below.
NOTE
To keep R-410A bottle cool, place the bottle in a bin of water and replace water as necessary.
8. Switch off the unit and close off cylinder valve, unit valve hose ball valve and manifold valves.
9. Disconnect the manifold hoses.
10. Isolate the power to the unit.
03. Installing The New Thermal Expansion Valve
1. Always replace TXV with the same valve.
Below is the list of thermal expansion valve part number specific to corresponding unit model and circuit:
Model
Thermal Expansion Valve (TXV) Part Number
Circuit #1
(Small Compressor)
Circuit #2
(Large Compressor)
PKY470T 4570-122 4570-126
PKY500T 4570-123 4570-128
PKY540T 4570-123 4570-128
PKY620T 4570-123 4570-128
PKY700T 4570-126 4570-128

TXV REPLACEMENT - PACKAGE UNIT
3
ActronAir is constantly seeking ways to improve the design of its products, therefore specifications are subject to change without notice.
Copyright © 2015 Actron Engineering Pty. Ltd.
2. Ensure TXV is installed with its flow arrow to follow the direction of flow of the refrigeration system. As reference,
take note of the direction of flow of the old TXV and fit the new one with the same orientation as the old valve.
TXV FLOW ARROW
DIRECTION OF
REFRIGERANT FLOW
3. Always use wet rags when brazing the valves. They are heat sensitive and can be easily damaged when brazing.
NOTES
• Always face the flame away from TXV when braizing.
• Cool down the expansion valve immediately after braizing.
4. Braze the equalizer tube in the new TXV.
5. When installing the TXV bulb sensor, ensure to clean the surface of the suction line where the previous one was
installed.
6. Make sure that the location of new bulb sensor will be in the exact location as the old bulb sensor.
As a reference, location of sensor bulb will be as follows:
D
a
b
b
Item
Suction Pipe
Outside
Diameter (D)
Bulb Location
a 1/2” to 5/8” 1 o’clock
b 3/4” to 1-1/4” 2-3 o’clock
7. Form the strap to shape and radius of the valve.
8. Leaving the bulb in formed strap, wrap the remaining end of the strap around the suction line.
9. Insert the end of the strap through the fastening clip (make sure the fastening screw is almost fully backed off), pull
tight then bend over the clip.

TXV REPLACEMENT - PACKAGE UNIT
4Tri-Capacity Package - TXV Replacement
Doc. 9590-2014-19B Ver. 3 211105
10.Securely tighten bolt ensuring the correct positioning as the previous one installed or as per above table in item 6.
ACCUMULATOR
SMALL COMPRESSOR PIPING
ACCUMULATOR
BIG COMPRESSOR PIPING
SUCTION PIPE
TXV BULB
SENSOR
TXV BULB
STRAP
DETAIL A
NOTES
• Make sure that the total length of the bulb is in good contact with suction line pipe.
• Check that equal lengths of the bulb are protruding from each side of the strap.
• Securely fastened bulb unto suction line.
• Always install bulb on the horizontal part of the suction line where the previous one was installed.

TXV REPLACEMENT - PACKAGE UNIT
5
ActronAir is constantly seeking ways to improve the design of its products, therefore specifications are subject to change without notice.
Copyright © 2015 Actron Engineering Pty. Ltd.
11. Wrap the whole bulb sensor area with insulation tape. See figure below.
SUCTION PIPE
INSULATION
TAPE
12. Adjust TXV spindle to match ActronAir default settings.
Model TXV Location Adjustment Settings Direction
PKY470T
Large Compressor Open 2 turns. 2
Small Compressor none ---
PKY500T
Large Compressor Close 3 turns. 3
Small Compressor Close 3-1/2 turns. 31/2
PKY540T
Large Compressor Open 2 turns. 2
Small Compressor Open 2 turns. 2
PKY620T
Large Compressor Open 2 turns. 2
Small Compressor Open 2 turns. 2
PKY700T
Large Compressor Open 2-1/2 turns. 21/2
Small Compressor Open 2 turns. 2
04.Recharging the System / Operation Preparation for Unit Start-Up
1. Start evacuation process as per ActronAir evacuation procedure.
2. Re-connect gauges and the cylinder of reclaimed R410a refrigerant as per refrigerant reclaim procedures above.
3. Recharge the system as per Refrigerant Charging procedures in the Installation and Commissioning Guide.
NOTE
A fresh R-410A refrigerant may be required as a replacement, particularly where there is contamination in the old
reclaimed refrigerant.
4. Switch back on the power to the unit.
5. Operate the system and check for system subcooling and superheat. If necessary, add refrigerant charge as per
procedure detailed in the Refrigerant Charging section of the Installation and Commissioning Guide.

TXV REPLACEMENT - PACKAGE UNIT
6Tri-Capacity Package - TXV Replacement
Doc. 9590-2014-19B Ver. 3 211105
TXV Supplier Default Setting and Specifications
SH
TXV Supplier Default Superheat Setting (SS):
TGE 10 (2 Full Turns*): SS = 4K (-13.8°C)
TR 6 (3 1/3 Turns*): SS = 2K (-15.8°C)
*No. of Turns required from spring stop point
= 19mm (3/4”)
T = 10Nm (7 ft-lbf)
Superheat Adjustment Parameter
+-
Change in Superheat per 360° ≈ 2°C
Undo TXV
Protective Cap
TXV
Remove
Protective Cap
Superheat
Adjustment
Spindle
Stop
1. Remove Protective Cap from the TXV Valve Body. 2. Turn Superheat Adjustment Spindle until it reach the stop
point, as shown above.
Change in Superheat / Turn :
TGE 10: ∆SH / 360° ≈ 2°C
TR 6: ∆SH / 360° ≈ 0.6°C
Replace TXV
Protective Cap
TXV
Replace
Protective Cap
3. To get into TXV supplier default setting, turn Superheat
Adjustment Spindle in the direction as shown. Refer to
TXV specifications above for the number of turns required
for particular TXV model.
4. Replace TXV Protective Cap onto Valve Body.
NOTES
Using the above set point as reference, further adjust the TXV as per instructions in the TXV.
Replacement section of this manual in order to finally set the TXV into ActronAir default settings.