70 • RLDS I&O Manual 026-1309 Rev 8
the unit may be in the purge cycle. If so, wait
until the purge cycle ends before continuing.
Slowly adjust the variable flow regulator in a
clockwise direction until the pressure is the
same as the original reading.
• You may have to block or partially block the
relief valve on the variable pressure
regulator in order to achieve the appropriate
pressure. Allow about 1 minute to stabilize,
and then read the first PPM value in the
diagnostics screen. The reading should be
within +10% of the actual concentration listed
on the cylinder.
• The unit may go into a purge cycle during
the test process. If this happens, the PPM
reading will drop to approximately 0. This does
not affect the verification results. However, in
order to obtain a valid PPM reading, the unit
must be drawing from Zone 1.
11. Close the reference gas cylinder by adjusting
the variable flow regulator in a
counterclockwise direction until it is fully
closed. Reset Zone 1 information (distance,
refrigerant, zone hold time) as desired for
normal operation.
12. If the reading in Step 10 is not within +10% of
the actual concentration listed on the cylinder,
verify:
• The pressure reading from Step 9.
• The tubing is securely connected to the
cylinder and Zone 1 input port.
• The proper refrigerant is selected (Step 6).
• The unit is in hold for Zone 1.
• That there is proper pressure from variable
flow regulator (Step 10).
• That enough time was given for readings to
stabilize and the reading was not taken
during a purge cycle (Steps 9 and 10).
If the unit still does not measure within +10% of the
concentration listed on the cylinder, please contact
Emerson Electronics and Solutions at 770-425-2724.
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