5-12
be pulled back without interference. Securely tighten the attach bolts and
repeat the procedure on the right side latch.
• Before reinstalling the enclosure, cycle the system several times to make
sure that the latch functions correctly and that vacuum leak down and
pressure integrity are within acceptable performance limits.
• If the lid O-ring is more than a year old it would be wise to replace it
before proceeding with the adjustment procedure. Please refer above to
5.3.3.
5.3.5 Pressure Relief Valve Adjustment Procedure (N/A With Formic
Acid)
• Referring to the plumbing diagram in Section 6, the relief valve identifier
is “1PR.” Remove the furnace enclosure. Referring to the Exhaust
Circuit pictorial drawing locate item 13, relief valve. Set the regulator on
the GAS 1 circuit to 50 psig (3.52 kg/cm
2
), open up the flow meter to
100%, and pressurize the chamber.
• If the compound gage reads 50 psig (3.52 kg/cm
2
), and gas is not
escaping through the relief valve - Stop!
The relief pressure is set too
high. Pull up on the knob to unlock and turn in a counterclockwise
direction to reduce pressure; continue turning until the chamber pressure
is reduced to less than 40 psig (2.82 kg/cm
2
).
• Increase the setting on the GAS 1 regulator to 60 psig (4.22 kg/cm
2
) and
then slowly adjust the relief valve until the chamber reaches a pressure of
50 psig (3.52 kg/cm
2
) or less.
• Referring back to the initial pressurization, if the compound gage will not
reach 50 psig (3.52 kg.cm
2
) the relief valve is set too low. In this case set
the GAS 1 regulator to 60 psig (4.22 kg/cm
2
) and adjust as previously
described. Push in on the relief valve knob to lock the setting.
Danger! The pressure relief valve is absolutely essential to protect against
an accidental over pressure condition. Do not modify or replace the pressure
relief valve with anything other than SST #35093 (SST #35405 W/Formic
Acid). Do not set the pressure relief valve to a pressure greater than 50 psig
(3.52 kg/cm
2
). Pressures in excess of the design rating of the containment
vessel may cause an explosion that can cause serious injury or death.
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