126
ALRM) the unit will be instructed to shut down immediately.
Software reset is automatic when input has been reset. Possible
causes are under/over voltage, phase loss, or phase unbalance.
T500 (Current Sensor Board Failure - A1)
T501 (Current Sensor Board Failure - A2)
T502 (Current Sensor Board Failure - B1)
T503 (Current Sensor Board Failure - B2) — If the current
sensor board malfunctions or is not properly connected to
its assigned digital input, an alert will be generated. It takes
2 to 4 seconds to log the alert. If the alert is logged, it stays
active for a minimum of 15 seconds to provide the applica-
tion a reasonable time to catch the failure. Compressors will
be not be inhibited by this failure. Recovery is automatic.
Reason for failure may be a faulty current sensor board, in-
correct wiring, or a damaged input on the MBB control
board.
T504 (Current Sensor Board Failure - A3)
T505 (Current Sensor Board Failure - B3)
T506 (Current Sensor Board Failure - A4 )
T507 (Current Sensor Board Failure - B4) — If the current sen-
sor board malfunctions or is not properly connected to its as-
signed digital input, an alert will be generated. It takes 2 to 4
seconds to log the alert. If the alert is logged, it stays active for
a minimum of 15 seconds to provide the application a reason-
able time to catch the failure. Compressors will be not be
inhibited by this failure. Recovery is automatic. Reason for
failure may be a faulty current sensor board, incorrect wiring,
or a damaged input on the CXB control board.
T610 (Economizer Actuator Out of Calibration)
A620 (Economizer 2 Actuator Out of Calibration)
T650 (Economizer 3 Actuator Out of Calibration)
T630 (Humidifier Actuator Out of Calibration)
A640 (Heating Coil Actuator Out of Calibration)
A650 (Bldg.Press. Actuator 1 Out of Calibration)
A660 (Bldg.Press. Actuator 2 Out of Calibration) — Each
of the actuators must have a minimum control range to operate.
If the actuator, after a calibration, has not learned a control
range appropriate for the application, this alarm/alert will be
sent. No action will be taken on this error. Recovery is auto-
matic. Reason for failure may be an obstruction or stuck link-
age that prevents full range calibration.
T611 (Economizer Actuator Comm Failure)
A621 (Economizer 2 Actuator Comm Failure)
T651 (Economizer 3 Actuator Comm Failure)
T631 (Humidifier Actuator Communication Failure)
A641 (Heating Coil Actuator Comm Fail)
A651 (Bldg.Press. Actuator 1 Comm Failure)
A661 (Bldg.Press. Actuator 2 Comm Failure) — Each of
the actuators communicates over the local equipment network
(LEN). If this error occurs, then it is impossible to control the
actuator. Depending on the function of the actuator, the control
will shut down any process associated with this actuator.
Recovery is automatic. Reason for failure may be incorrect
wiring, incorrect serial number configuration, or damaged
RS-485 drivers on the LEN bus.
T612 (Economizer Actuator Control Range Increased)
A622 (Economizer 2 Actuator Control Range Increased)
T652 (Economizer 3 Actuator Control Range Increased)
T632 (Humidifier Actuator Control Range Increased)
A642 (Heat Coil Actuator Control Range Increased)
A652 (Bldg.Press. Act. 1 Control Range Increased)
A662 (Bldg.Press. Act. 2 Control Range Increased) — The
actuators, once properly calibrated, learn their end stops for
movement. During normal operation, if the actuator perceives
that the actuator is able to go farther than its learned range of
operation, this error will be broadcast. Reason for failure may
be a slipping of the linkage and therefore this error may mean
that the actuator cannot perform its assigned function. Recov-
ery requires a fix of any slipped linkage and/or a re-calibration.
T613 (Econ Actuator Overload, Setpt Not Reached)
A623 (Econ2 Actuator Overload, Setpt Not Reached)
T653 (Econ 3 Actuator Overload, Setpt Not Reached)
T633 (Humidifier Act Overload, Setpt Not Reached)
A643 (Ht Coil Act Ovrload, Setpt Pos Not Reached)
A653 (BP Act. 1 Overload, Setpnt Pos Not Reached)
A663 (BP Act. 2 Overload, Setpnt Pos Not Reached) — If
an actuator is unable to achieve a commanded position within a
reasonable period of time, this alarm or alert will be broadcast.
This may be an indication of a stuck actuator. No action is
taken. Recovery is automatic.
T614 (Economizer Actuator Hunting Excessively)
A624 (Economizer 2 Actuator Hunting Excessively)
T654 (Economizer 3 Actuator Hunting Excessively)
T634 (Humidifier Actuator Hunting Excessively)
A644 (Heat Coil Actuator Hunting Excessively)
A654 (Bldg.Press. Actuator 1 Hunting Excessively)
A664 (Bldg.Press. Actuator 2 Hunting Excessively) —
This alert occurs when the commanded actuator position is
changing too rapidly. Recovery is automatic.
T615 (Econ, Outside 1, Not Economizing when it
Should) — When the control detects a stuck or jammed actua-
tor, it shall compare the stuck position to the command position
to log additional alerts. If the stuck position < commanded po-
sition the alert is set.
T616 (Econ, Outside 1, Economizing when it Should
Not) — When the control detects a stuck or jammed actu-
ator, it shall compare the stuck position to the command
position to log additional alerts. If the stuck position >
commanded position, the alert is set.
T617 (Econ, Outside 1, Damper Stuck or Jammed) —
The actuator is no longer moving and the actual position
is greater than or less than E.GAP% of the commanded
position for E.TMR seconds. Reset is automatic.
T625 Econ 2 (Return) Not Economizing When It Should
—
When the control detects a stuck or jammed actuator, it shall
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position < commanded position the
alert is set.
T626 Econ 2 (Return) Economizing When It Should Not
— When the control detects a stuck or jammed actuator, it shall
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position > commanded position, the
alert is set.
T627 Econ 2 (Return) Damper Stuck Or Jammed
— The
actuator is no longer moving and the actual position is
greater than or less than E.GAP% of the commanded posi-
tion for E.TMR seconds. Reset is automatic.
T655 Econ 3 (Outside 2) Not Economizing When it Should
—
When the control detects a stuck or jammed actuator, it shall
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position < commanded position the
alert is set.
T656 Econ 3 (Outside 2) Economizing When It Should Not
—
When the control detects a stuck or jammed actuator, it shall
compare the stuck position to the command position to log ad-
ditional alerts. If the stuck position > commanded position, the
alert is set.
T657 Econ 3 (Outside 2) Damper Stuck Or Jammed
— The
actuator is no longer moving and the actual position is greater
than or less than E.GAP% of the commanded position for
E.TMR seconds. Reset is automatic.
A700 (Air Temp Lvg Supply Fan Thermistor Failure)
—
The failure of this sensor will shut the system down and gener-
ate an alarm as this thermistor is a critical component to funda-
mental operation and diagnosis of the rooftop unit. Recovery is
automatic. Reason for failure may be incorrect wiring, a faulty
thermistor, or a damaged input on the MBB control board.
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