Macurco RD-xx User Manual
REV – 1.0 [34-2900-0511-7 ] 26 | Page
7. The RD-xx will step through a cycle test:
a. The display progresses through the BUZ (Buzzer Test) Art (alarm relay test), Frt (fan relay test) then 42t (4-20
mA output test). Make sure that the settings are “On” or not disabled “diS”.
b. During the first 3 seconds of the test cycle, the display will show BUZ and set off the audible buzzer
c. The alarm relay will be closed for 5 seconds, so any devices connected to that relay will be tested.
d. The Fan relay will be activated for the next 1 minute of the test, so if the fan circuits are wired in the normal
manner, the fan should run.
e. The 4-20mA output will then ramp up from 4 to 16 mA over the next 130 seconds of the test, so if the circuit is
wired in the normal manner, the control panel or building automation system should respond.
f. At the end of the test cycle, the light will turn green and be on steady (Normal Operation), the fan & alarm
relay will be in standby mode and the 4-20 mA output will return to 4 mA (in clean air).
8. When testing is completed reassemble the unit or units.
7.2 Manual Operation Test
This option gives the user the opportunity to manually initiate an individual test for each relay, the analog output and the sensor
response to gas. From normal operation mode press the Next button 2 times to get to the Test Mode (tSt). Press the Enter
button once to get into the Test Menu. Press the Next button to scroll through the five test options and press Enter to initiate
the selected test. Note that if the relay or 4–20 mA output has been disabled, the test selection will not be displayed in the test
menu.
bUZ – Buzzer Test, 3 seconds
Art – Alarm Relay Test, 5 seconds
Frt – Fan Relay Test, 60 seconds
42t – 420 loop test, 130 seconds
gtS – Gas Test, 3 minutes (no output to the panel during the gas test)
The display will flash during the test, or in the case of the gas test, the gas level will alternate with gtS. Once the test is
complete, the display will return to a steady display. To exit the test menu, press the Next button until “End” is displayed then
press Enter to return to normal mode.
7.3 Calibration and Test Kits
The RD-xx calibration can be calibrated and verified (or bump-tested) with the RD-FCK with R-134a refrigerant gas, regulator,
and test hood, available through your local representative or from Macurco.
Note: For optimum test results it is suggested that the unit be in clean air (green light on steady), in a low ambient air flow and
have uninterrupted power for 7 days.
Contents of the RD-FCK
• (1) Gas Cylinder, 1000ppm R-134a refrigerant gas in air
• (1) Gas Cylinder, 600ppm R-134a refrigerant gas in air
• 0.2LPM Gas regulator with about two feet of plastic tubing
• Nafion Tubing
• 2-piece Tygon Tubing
• Test hood
Note: Gas testing results can vary depending upon temperature, humidity, test duration and other variables. For optimum
results, it is suggested that the unit be in continuous operation for a minimum of 7 days, in a stable environment and at
standard conditions before proceeding with testing.
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