108
TK 61555-2-MM-EN
Seat (Center Section) Orifice Check
There are three 0.84 mm (0.033 in.)holes located in the three-way valve seat (center section). Only
one is used depending on how the valve is configured.
•
If the hole is too large the valve will be slow to shift from heat to cool when the condenser
pressure is higher than discharge pressure because gas will flow to the discharge line instead
of behind the piston.
•
If the hole is too small the valve will be slow to shift from heat to cool when discharge
pressure is higher than condenser pressure because the flow is restricted.
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Whenever you disassemble a three-way valve you should check that all three of the holes are
drilled cleanly.
Figure 86.
Check Seat Orifice
1.
Number 66 Drill Bit
Assembly/Installation
After cleaning and inspecting all parts, reassemble the valve as follows:
1.
Install the screen in the bottom cap.
2.
Install the new stem in the bottom cap.
3.
Install new gaskets on both sides of the seat. Oil the gaskets in compressor oil before
installing.
4.
Use the three-way valve seal installation tool P/N 204-1008 to install a new seal on the piston.
This prevents the seal from being stretched and damaged.
a.
Place the tapered tool over the piston.
b.
Lubricate the seal with refrigeration oil.
c.
Slide the seal onto the tapered tool with the spring side facing away from the piston.
d.
Use the pipe to hand press the seal onto the piston.
