Troubleshooting
SiBE811001EB
323
CONVENI-PACK
9.1.4 Methods of Fixing, Insulating, and Antisweat Covering of Feeler Bulb
In order to sense the proper temperature of the suction pipe, securely fix the feeler bulb so as
not to receive influence from external wind, water, or else.
1. Metal clamps for feeler bulbs
Securely fix the feeler bulb with a metal clamp or band so that it will get in absolute contact
along its entire length with the suction pipe.
(If plastic products are used to fix the feeler bulb, no proper temperatures will be detected
due to temperature fluctuations or secular changes. Therefore, do not use plastic materials.)
2. Insulating materials (for freezing)
Make it a rule to mount the feeler bulb on the suction pipe and then wind insulating materials
around them.
(Requirements for insulating materials)
• Small heat capacity of insulating materials' own
• Low thermal conductivity
• No water absorption properties
• Heat resistance provided (particularly heat pump unit)
(Specific insulating materials)
Use "Toraypef PP" or equal as the insulating materials for the feeler bulb of electronic
expansion valve.
Cautions in connecting the external equalizer pipe
If this pipe is connected with the use of flare nut, seal the flared connection with silicone.
Reference type for silicone: KE45RTV (from Shinetsu Chemical)
Be aware that inadequate sealing may allow moisture to enter and freeze in threaded part,
thus producing cracks in the flare nut.
Wind
Metal clamp
Feeler bulb
Wind insulating materials
by 20 mm or more before
and after the feeler bulb.
For insulating materials, use
Toraypef or equal of a thickness
of 10 mm or more.
Section A-A'
For freezing with a pipe of
φ
22.2 mm or less
Use 3 insulation
bands
Equalizer pipe
Flare nut connection
Seal with silicone
