Page 47 of 47
TVP Manual (full) March 2007 CE rev 03.doc
3.2 Trouble shooting guide – problems during cool
Symptom Possible Cause
Corrective Action
System does not cool CT fails to
get colder than –150
o
c after 45
minutes in standby
Water temperature too high
or too low
Correct water temperature and flow
rate reset system
System has a leak System should be shut down for a
period of approximately 48 hours
(or until the value of CT is greater
than 10oc. The values of DP and
SP should be taken and compared
with the values following
installation. Locate and repair leak
pay attention to all flare and
refrigeration line joints before
topping system up to recommended
pressures.
If SP is above 45 psi start
valve may have become
stuck open. Typically CT will
also not be lower than
-100
o
c
With valve cover removed and the
system powered, check the start
valve solenoid becomes magnetised
(use screwdriver). If solenoid
magnetised switch unit off and
restart after 30 minutes. If coil is
not magnetised switch unit off.
Remove valve solenoid and heat
valve gently to 100oc with hot air
gun. 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.
If this does not correct fault stop
unit allow to warm up for 48 hours
and restart.
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