Sealed System Service Procedures; Service Equipment; Drier Replacement - Fisher & Paykel RX256DT4X1 FP Service Manual

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13

SEALED SYSTEM SERVICE PROCEDURES

13.1

Service Equipment

Listed below is equipment needed for proper servicing of HFC134a systems. Verify equipment is
confirmed by manufacturer as being compatible with H FC134a and ester oil system.
Equipment must be exclusively used for HFC134a. Exclusive use of equipment only applies to italic
items.
• Evacuation pump
Check with vacuum pump supplier to verify equipment is compatible for HFC134a. Robinair,
Model 15600 2 s t a g e , 6 c u b i c f e e t p e r m i n u t e p u m p i s recommended.
• Four-way manifold gauge set, with low loss hoses
• Leak detector
• Charging cylinder
• Line piercing saddle valve
(Schroeder valves). Seals must be HFC134a and ester oil compatible. Line piercing valves may be
used for diagnosis but are not suitable for evacuation or charging, due to minute holes pierced in
tubing. Do not leave mechanical access valves on system.
Molecules of HFC134a are smaller than other refrigerants and will leak where other refrigerants
would not.
• Swagging tools
• Flaring tools
• Tubing cutter
• Flux
• Sil-Fos
• Silver solder
• Oil for swagging and flaring
• Copper tubing
• Dry nitrogen
99.5% minimum purity, with –40
• Crimp tool
• Tube bender
• Micron vacuum gauge
• Process tube adaptor kit
• Heat trap paste
• ICI appliance grade HFC134a
13.2

Drier Replacement

Before opening refrigeration system, recover H FC 134a refrigerant for safe disposal.
Every time sealed HFC134a system is repaired, drier filter must be replaced.
Cut drier out of system by completing the following steps. Do not unbraze drier filter. Applying heat to
remove drier will drive moisture into system.
To avoid death or severe personal injury, cut drier at correct location. Cutting drier at incorrect
location will allow desiccant beads to scatter. If spilled, completely clear area of beads.
1. Score capillary tube close to drier and break.
2. Reform inlet tube to drier allowing enough space for large tube cutter.
3. Cut circumference of drier at 32mm below condenser inlet tube joint to drier.
O
F or lower dew point
WARNING
92
Valves eventually will leak.