BTU XT-70 - Page 93

93
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XT-70 Control Panel 93
Mode =
Refrig
no
Door Closed
yes
CO2 > CO2 SP
REFRIG Output <
MIN Operating Level
yes
CO2 <
CO2SP - DIFF
RUN PID HEAT
MODE & CO2 PURGE
SP = SP + CO2 PLEN RISE
Back to Start
ARL
no
Mode =
Cooling
no
yes
Purge_CFG
= 2
OSA > START
TEMP
MODE =
ARL
Door = 0 %
yes
MODE =
CO2
RUN PID HEAT
MODE & CO2 PURGE
SP = SP - CO2 PLEN RISE
Door = 0 %
yes
RUN
PID HEAT
MODE
CLR REFRIG NEG
ERROR FLAG
no
ARL ON
plen <
SP - LC
CLR REF NEG & POS ERROR FLAG
LOAD ROL
LOAD ID TIMER
SET NEG
CLR POS
REFRIG
FLAG
ARL OFF
CLR REFRIG NEG & POS
ERROR FLAGS
SET REF POS
ERROR FLAG
CLR REFRIG POS
ERROR FLAG
no
REFRIG Output <
MIN Operating Level
+ ROL_Diff
CLEAR REF POS
ERROR FLAG
yes
yes
no
yes
yes
no
no
yes
no
no
yes
no
LOAD LCO TIMER
ARL OFF
REFCO2 OFF
ROL START
TIMER = 0
no
LCO TIMER
= 0?
yes
RELAOD LCO TIMER
no
yes
yes no
no
yesno