Table of Contents
Advertisement
4.5.2
Pressure Settings
4.5.2.1 Minimum Enclosure Pressure "P1"
When enclosure pressure drops below P1 during operation mode, either the K1
enclosure contact must be interrupted or the K2 alarm contact must be activated.
4.5.2.2 Alarm Pressure "P2"
If enclosure pressure drops below P2 during operation mode, the solenoid valve will
energize until pressure goes above P2+HYST, if leakage compensation has been
implemented by setting a HYST value.
If leakage compensation is not used, K2 can be programmed to energize when
pressure drops below the P2 set point.
P2 can be adjusted to above P1 and below P3 values.
4.5.2.3 Purging Pressure "P3"
The purging timer starts when enclosure pressure is above P3. If the enclosure
pressure is above P3, purging will start and finish uninterrupted. If the enclosure
pressure is below P3, the purging timer will not start. If the enclosure pressure drops
below P3 during purging, the purging timer will immediately reset to its beginning
time and will not start timing down until enclosure pressure is above P3. P3 can be
adjusted to above P2 and below P4 values.
4.5.2.4 Maximum Internal Pressure "P4"
If enclosure pressure is above P4, the display will read 'MAX' to indicate that
maximum pressure has been achieved. Regardless of the action of the solenoid valve
(purging, leakage compensation), the solenoid valve will de-energize and will not
come on until enclosure pressure goes below P4. This action may cause the solenoid
valve to oscillate on and off. If this happens, it should be noted as a maximum
pressure problem.
If K1 was on before P4 was reached, it will remain on after enclosure pressure is
above P4. P4 is adjusted above P3. Maximum setting is 9.99 in wc (24.86 mbar).
7500 S
M
P
erieS
anual
rograMMing
55
Advertisement
Table of Contents
