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
