Steris SYSTEM 1E, Maintenance Manual

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3-6
764333-675
Event 5 – Water Temperature Test: SOL4 is energized
to close V5. SOL5 is energized. Water flows through
SOL5, past TC3, which monitors for water
temperature greater than 43°C (110°F). Water
temperature is monitored for a minimum of
20 seconds. Temperature monitoring continues until
the minimum temperature requirement has been
met, or 240 seconds have passed. SOL5 is
de-energized once either of these conditions has been
met. If 240 seconds pass and water temperature does
not reach 43°C, an alarm occurs and the cycle aborts.
(Alarm:
"TEMPERATURE UNDER 43 DEG". )
Once the water temperature reaches 43°C, the control
checks the UV intensity. If the intensity is greater than
15.0 mA, the cycle progresses to
Event 6 . If the
intensity is less the 15.0 mA, the control continues to
monitor water for up to 10 minutes. If intensity
remains below 15.0 mA following monitoring time,
the control aborts the cycle. (Alarm:
"UV
INTENSITY TIMEOUT". )
Intensity is monitored for the duration of the cycle.
If intensity drops below 14.5 mA, the control aborts
the cycle (Alarm:
"UV LAMP PROBLEM". )
If, at any time during the entire cycle, a temperature
>60°C (140°F) is measured, an alarm occurs and the
cycle aborts. (Alarm:
"TEMPERATURE OVER 60
DEG". )
Event 6 – Fill: SOL4 remains energized from Event 5 .
V5 remains closed while SOL7 is energized, allowing
water to flow into the SYSTEM 1E Processor, past
CK4 and the MaxPure Filter. Note that V6 is open at
this point, allowing water to fill piping on both sides
of the pinch valve.
Event 7 – Chamber Full: Chamber fills with water until
float switch in the float block rises, causing LS3 to
open. Note that air from the chamber is vented
through the float block through check valves CK2
and CK3. An alarm occurs if a full chamber has not
been sensed within five minutes. If this time limit
elapses, the cycle aborts. (Alarm: "
FILL PROBLEM". )
A notice is printed if fill takes longer than four and
one half minutes. Control proceeds to
Event 8 .
Event 8 – Stabilize: SOL7 de-energizes and control
waits 10 seconds before proceeding to Event 9 .
Event 9 – Circulation Pump Prime: SOL4
de-energizes for one second, opening V5. This
removes any air that may be trapped in P1. SOL7 is
energized for 6 seconds to purge trapped air. SOL7
is then de-energized. Control proceeds to
Event 10 .
Event 10 – Water Circulation Prior to Heating: SOL4
is energized, and P1 energizes, pumping water
through unit. This purges air from the remainder of
the piping. Control proceeds to
Event 11 .
Event 11 – Heating: HTR1 energizes, TC1 and TC2
monitor water temperature in chamber. Control
proceeds to
Event 12 when 60 seconds have elapsed.
Event 12 – Stabilize: HTR1 and P1 de-energize. This
allows any air still in the system to rise and travel to
the float block. After six seconds, control proceeds to
Event 13.
Event 13 – Refill: SOL7 energizes for six seconds,
further removing any air in the system. Control
proceeds to
Event 14 .
Event 14 – Check for Full Condition: LS3 is checked.
If open (chamber full condition), control proceeds to
Event 15 . If closed (chamber not full), SOL7 energizes
for up to eight seconds, then proceeds to Event 15 .
Event 15 – P1/P2 Pump Operation: P2 is energized and
HTR1 energizes. After a five-second delay, LS6 is
checked for a closed condition. This step verifies if
the HP Pump is working. Control proceeds to
Event
16 . If LS6 is not sensed closed, an alarm occurs and
the cycle aborts (Alarm: "HP PUMP FAILURE:
PUMP ON" .)
Event 16 – Final Heat: P1 is energized, TC1 and TC2
monitors water temperature after five seconds.
Control proceeds to Event 17 when TC1and TC2 >
46°C. If seven minutes elapses without reaching
temperature, the abort is called (Alarm:
"HEAT
PROBLEM" .)
Event 17 – Exposure Phase: Control enters exposure
phase and starts a six-minute timer. HTR1 cycles
on/off to maintain TC1 between 53 and 55°C. HRT1
is energized if TC1 < 53°C and HTR1 is de-energized
if TC2 > 55°C.
The chamber fluid temperature is monitored during
the six-minute exposure. If temperature drops below
45.5°C at any time during exposure, an alarm occurs
and the cycle aborts. (Alarm:
"TEMPERATURE
UNDER 45.5 DEG". )
The concentration monitor circuit is checked during
the six-minute exposure. If a reading of <175 counts
is measured, an alarm occurs and the cycle aborts.
(Alarm:
"CONCENTRATION LOW". )
The chamber fluid level circuit is checked during the
six-minute exposure. If LS3 senses a not-full
condition, an alarm occurs and the cycle aborts.
(Alarm:
"CHAMBER LEVEL LOW". )
Control proceeds to Event 18 after six minutes.
Event 18 – Drain: HTR1 de-energizes, and SOL4
de-energizes, opening V5. P1 de-energizes and P2
de-energizes after a one-second delay. SOL4
energizes, closing V5. P1 and P2 are energized for 10
seconds. SOL4 is de-energized opening V5. SOL3 is