28 RT-SVD03G-EN
ReliaTel Refrigeration Module (RTRM)
What the readings mean
Service- RTRM-J6-10.
ON - Clogged filter switch has been closed for at least 2 minutes, indicating a clogged filter. This
example illustrates what would be seen if the unit did not have a zone sensor with indicator LEDs,
such as would be the case with an ICS system. Table 1, p. 27 lists voltages seen if a zone sensor is
attached. Volt meter readings should be within 10%.
OFF -
1. Clogged filter switch is in open position or no switch is installed.
2. Fan Fail switch (if installed) has opened (3-25 Ton) or closed (27.5-50 Ton) within the first 40
seconds, proving that the supply fan has started.
PULSING -
1. Fan Proving switch (also called Fan Fail Switch FFS) has failed to open (3-25 Ton) or closed (27.5-
50 Ton) before 40 seconds. During this condition, the unit will run for 40 seconds and then stop.
Only the fan will run during the TEST mode, except during the first 40 seconds.
2. Freezestat Active
3. Smoke Detector Active
Note: Note that at the bottom of the meter display, the "analog bar" will pulse back and forth. Some
meters do not have this extra feature.
Part Number – SEN01522
Service LED
AM
Mo
Service Diagnostic
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