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TVP Manual (full) March 2007 CE rev 03.doc
1.4 Operators quick reference guide
Following system parameters ranges are normal any abnormal conditions will be reported via
the display and the RS232 link if enabled.
Parameter
Description
Acceptable (normal) range
SP start up *
Suction Pressure
20 to 120 psi
DP start up *
Discharge pressure
100 to 470 psi
SP unit running
7 to 60 psi
DP unit running
100 to 380 psi
SP & DP unit off)
|
System balance at ambient
235 to 260 psi
CT
Coldest temperature
-100 to –170
o
C
WT
Water temperature
35
o
C default 40
o
C optional
CI
Coil in temperature
+90
o
C to –150
o
C
CO
Coil out temperature
+40
o
C to –150
o
C
* Start up only
Balance pressure CT value to be obtained at same time.
Alarm messages
Note all alarm messages before resetting unit. Repeated alarm messages can be an indication
of imminent system failure or failure of the water supply.
The system will shut down if control parameters are breached and an error message will be
displayed: If a system parameter is breached a manual reset is required. (actuate EMO and
resetting)
CAUTION
A forced manual reset means it is the users responsibility to investigate and correct any cause
of error before re-starting
Error Code
Display Message
Means
E1
DP High
Discharge pressure high
E2
SP Low
Suction pressure low
E3
WT High
Water temperature high (greater than 35
o
C)
E6
DT High
Discharge gas temperature has exceeded 145
o
C
For an explanation of the error messages in relation to a possible fault see trouble shooting
section (3)
CAUTION
Greater system performance and reliability may be achieved by following a few simple
preventative observations
Daily checks
Frost build up on refrigeration lines or feed through. Excessive frost build up can lead to
fracturing of metal parts.
System running pressures after a predetermined period of standby ideally at the beginning of
the working day.
Weekly checks
System balance pressure SP or DP when CT is above 0
o
C i.e. after 48 hours of shut down.
Typically Monday morning before system restart.
Water chiller function
Water supply failure is the most common cause of an established system failing
Annual check
System balance pressure SP or DP when CT is above 0
o
C