Telemark TVP-2000, Руководство по эксплуатации, установке и обслуживанию

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TVP Manual (full) March 2007 CE rev 03.doc
3.2 Trouble shooting guide – problems during cool cont 1
Symptom
Possible Cause
Corrective Action
System does not cool CT does
get colder than –150
o
c after 45
minutes in standby
Cool valve hand valve is closed or
common return (suction hand
valve) is closed Switch off allow valves to
return to ambient temperature
before attempting to open.
Operating valves while cold
can cause damage.
Occasionally common return
(suction hand valve may
become stuck down in this
case the cryo-coil should be
isolated and the procedure for
installation should be repeated
Cool solenoid valve not
functioning With valve cover removed and
the system check the cool
valve solenoid becomes
magnetised (use screwdriver).
If solenoid is operational run
system in standby remove
valve solenoid and heat valve
gently to 100oc with hot air
gun. Replace solenoid and
attempt cooling – TVP systems
have a patented refrigeration
system, which prevents valve
problems under normal
operation. Almost all solenoid
valve problems are traced to
poor installation introducing
moisture into the vacuum
system
System has poor cooling with
large temperature differential
between CI and CO Too much heat is being applied to
the cryo-coil
Possible refrigeration leak Check values of
SP
DP
CT
WT
While in cool, and standby and
compare with previous logged
values
Poor system design Consult Telemark for free
application advice. Aim for a
cryo-coil, which has low mass,
high surface area, low volume
and a small resistance to flow.
Cryo-coil or refrigeration lines
have become damaged It is common for the
refrigeration lines to be twisted
or damaged. The entire
refrigeration circuit should be
free from restrictions
Hand valves not fully open Check defrost and suction line
hand valves have been opened