Installation manual

41InRow RD Fluid Cooled Operation and Maintenance
Fluid valve not responsive • Actuator not connected
properly
• Verify that the actuator is connected properly.
• Actuator and shaft not
rotating together
• Tighten the linkage screw on the actuator shaft.
• Rotary switch on the
bottom of the actuator is
set incorrectly
• Confirm that the rotary switch is pointing toward the front of
the cooling unit.
Display interface not
operational but cooling unit
operates
• Display interface not
connected properly
• Verify that the display interface cable is connected properly.
Incorrect air pressure • False filter clogs • Verify that the ends of the clear plastic air tubes are not
obstructed.
• Verify that the clear plastic air tubes are connected to the
controller.
• Verify that the clear plastic air tubes are not pinched.
Alarms do not show up on
monitoring equipment
(Customer Output Contact)
• External monitoring
equipment is not
receiving power or is not
functioning properly
• Confirm that power, if required, is being supplied to the
external equipment.
• If the cooling unit (+12 V or +24 V) is providing power to the
external equipment, verify that the external equipment is <
50
mA.
• Test the external equipment by bypassing the output contact.
• Verify Customer Output Contact settings. See “Contacts” on
page 12.
Cooling unit does not shut
down on command
• Drive voltage • Verify that there is a drive voltage entering the input of the
cooling unit. You may use the available +12 V or +24 V
nearby. You must then also use the ground.
• Verify Customer Input Contact settings. See “Contacts” on
page 12.
No communication with
building management
system (BMS) port
• Improper connection • Confirm that the cooling unit is connected to the BMS port
and not to the Control port.
• Make sure that the wire polarity is correct.
Using a DC voltmeter, test the signal with no transmissions in
progress. Pin 2 should be greater than Pin 1 by at least 200
mV. Measure the cooling unit with the cable disconnected,
and then measure it again with the cable connected. If the
signal is less than 200 mV, the cooling unit may be reverse-
wired.
• Make sure that every cooling unit has either two sets of wires
in its connector OR one set of wires and a 100-ohm resistor (a
terminating resistor of 100 to 120 ohms).
Cooling units are not
communicating with each
other
• A-Link failure • Verify the actual number of cooling units in the group
matches the group number setting.
• Verify that every cooling unit has either two cables or one
cable and a terminator.
• Confirm that the A-Link cables are connected to the A-Link
ports and that a network cable is connected to the network
port.
Output air is 17°C (62°F)
and fans are running at a
very high rate of speed.
• Upper or lower supply air
sensor fault
• Either the upper or lower supply air temperature sensor has a
fault. Verify that both supply air temperature sensors are
installed and working properly.
Problem Possible Cause Corrective Action