Telemark Cryogenics 1200 Instruction Manual page 51

Symptom Possible Cause
System does not
Water temperature too high or too low
cool CT fails to get
colder than -140 to
o
-150 c after 45
minutes in standby
Error Code "E3"
Error Code "E2"
System has a leak
If SP is above 45 psi start valve may
have become stuck open. Typically
CT will also not be lower than
-100
Unit does not cool
when in "COOL"
mode. CI and
CO temperatures
Cool valve hand valve is closed or
do not drop
common return (suction hand valve) is
closed
Cool solenoid valve not functioning
Telemark Cryogenics Microprocessor Based Cryochillers
o
c
Page 51 of 63
Corrective Action
Correct water temperature and
flow rate reset system
System should be shut down for a
period of approximately 48 hours
(or until the value of CT is greater
than 10°c. 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.
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 100°c with hot air
gun. Cryochiller 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.
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
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 100°c with hot air
gun. Replace solenoid and
attempt cooling – Cryochiller
systems have a patented
refrigeration system, which
prevents valve problems under
normal operation. Almost all
solenoid valve problems are traced
to poor installation .
Revision 1.0.7 October 2018