Identifying Valves Used in Sigma Products (SB1001.01)

5. Replace the black insulative foam or thermal
barrier washer, this is very important to prevent
coil freeze up and cold “run aways”
(image 2-22 or 2-24).
Tip: If you have a valve with black foam
between the body and coil it is recommended
that you replace the foam with a
Sigma thermal barrier washer. To do this,
cut the surrounding foam flush with the top
of the valve body (image 2-23). Discard
the black foam and replace it with a Sigma
thermal barrier washer (image 2-24) (part
number 35831 for “B” and 35830 for “D”
valves).
6. Slide the coil onto the plunger guide.
7. Use coil retaining nut to hold the coil in place.
Tighten to snug tightness only (image 2-25).
Excess tightening will compress the insulative
layer and can damage the plunger guide.
Foam under the coil should not be compressed
flat, again we recommend replacement
of the black foam with a Sigma thermal
barrier washer.
Image 2-22
Image 2-23 Image 2-24
END
SB1001.01-30
Image 2-25