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Controls, Start-Up, Operation, Service and ... - Climayoreo

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This is the reverse of the Pressurization Mode. Closing the<br />

economizer, opening the return-air damper, turning on the<br />

power exhaust, <strong>and</strong> shutting down the indoor fan will decrease<br />

pressure in the space. Recovery is automatic when the input is<br />

no longer on.<br />

A406 (Pressurization Emergency Mode) — If the pressurization<br />

input on the CEM is energized, a pressurization mode<br />

occurs which flags an alarm. This mode attempts to raise the<br />

pressure of a space to prevent smoke infiltration from another<br />

space. The space with smoke should be in an Evacuation Mode<br />

attempting to lower its pressure. Opening the economizer, closing<br />

the return air damper, shutting down power exhaust, <strong>and</strong><br />

turning the indoor fan on will increase pressure in the space.<br />

Recovery is automatic when the input is no longer on.<br />

A407 (Smoke Purge Emergency Mode) — If the smoke<br />

purge input on the CEM is energized, a smoke purge mode<br />

occurs which flags an alarm. This mode attempts to draw out<br />

smoke from the space after the emergency condition. Opening<br />

the economizer, closing the return-air damper, <strong>and</strong> turning on<br />

both the power exhaust <strong>and</strong> indoor fan will evacuate smoke<br />

<strong>and</strong> bring in fresh air. Recovery is automatic when the input is<br />

no longer on.<br />

T408 (Dirty Air Filter) — If no dirty filter switch is installed,<br />

the switch will read “clean filter” all the time. Therefore the<br />

dirty filter routine runs continuously <strong>and</strong> diagnoses the input.<br />

Because of the different possible times it takes to generate<br />

static pressure, this routine waits 2 minutes after the fan starts<br />

before the dirty filter switch is monitored. If the dirty filter<br />

switch reads “dirty filter” for 2 continuous minutes, an alert is<br />

generated. No system action is taken. This is a reminder that it<br />

is time to change the filters in the unit. Recovery from this alert<br />

is through a clearing of all alarms (manual) or after the dirty filter<br />

switch reads clean for 30 continuous seconds (automatic).<br />

T409 (Supply Fan Comm<strong>and</strong>ed On, Sensed Off Failure)<br />

T409 (Supply Fan Comm<strong>and</strong>ed Off, Sensed On Failure)<br />

A409 (Supply Fan Comm<strong>and</strong>ed On, Sensed Off Failure)<br />

A409 (Supply Fan Comm<strong>and</strong>ed Off, Sensed On Failure) —<br />

Both the alert <strong>and</strong> the alarm refer to the same failure. The only<br />

difference between the alarm <strong>and</strong> alert is that in the case where<br />

the supply fan status configuration to shut down the unit is set<br />

to YES (ConfigurationUNITSFS.S), the alarm will be<br />

generated AND the unit will be shut down. It is possible to<br />

configure ConfigurationUNITSFS.M to either a switch<br />

or to monitor a 0.2-in. wg rise in duct pressure if the unit is<br />

VAV with duct pressure control (IGV or VFD).<br />

The timings for failure for both are the same <strong>and</strong> are illustrated<br />

in the following table:<br />

UNIT TYPE/MODE MINIMUM ON MINIMUM OFF<br />

TIME WAIT TIME WAIT<br />

CV (no gas heat) 30 seconds 1 minute<br />

CV (gas heat) 2 minutes 4 minutes<br />

VAV (no gas heat) 1 minute 1 minute<br />

VAV (gas heat) 3 minutes 4 minutes<br />

Recovery is manual. Reason for failure may be a broken fan<br />

belt, failed fan relay or failed supply fan status switch.<br />

A410 (Supply Fan VFD Fault) — The MBB has received a<br />

fault status from the supply fan VFD. The unit will be shut<br />

down, <strong>and</strong> a manual reset is required. The VFD keypad will indicate<br />

which fault has occurred. Reset can be done at the unit<br />

control (AlarmsR.CUR) or the VFD keypad.<br />

A411 (Exhaust Fan VFD Fault) — The MBB has received a<br />

fault status from the exhaust fan VFD. Building pressure control<br />

will be stopped <strong>and</strong> a manual reset is required. The VFD<br />

keypad will indicate which fault has occurred. Reset can be<br />

done at the unit control (AlarmsR.CUR) or the VFD keypad.<br />

T421 (Thermostat Y2 Input On without Y1 On) — If Y2 is<br />

on <strong>and</strong> Y1 is off then this alert condition is initiated. The<br />

control continues as if both Y1 <strong>and</strong> Y2 were requested. Alert<br />

recovery will not occur until Y1 is seen. This h<strong>and</strong>les some<br />

115<br />

conditions of an incorrectly wired thermostat <strong>and</strong> may prevent<br />

multiple alerts <strong>and</strong> recoveries from clogging the alarm<br />

histories.<br />

T422 (Thermostat W2 Input On without W1 On) — If W2<br />

is on <strong>and</strong> W1 is off then this alert condition is initiated.<br />

The control continues as if both W1 <strong>and</strong> W2 were requested.<br />

Alert recovery will not occur until W1 is seen. This h<strong>and</strong>les<br />

some conditions of an incorrectly wired thermostat <strong>and</strong> may<br />

prevent multiple alerts <strong>and</strong> recoveries from clogging the alarm<br />

histories.<br />

T423 (Thermostat Y <strong>and</strong> W Inputs On) — Simultaneous calls<br />

for heating <strong>and</strong> cooling are illegal <strong>and</strong> will be alarmed. Cooling<br />

<strong>and</strong> heating will be locked out. Recovery is automatic when the<br />

condition no longer exists.<br />

T424 (Thermostat G Input Off On a Cooling Call) — If G is<br />

off <strong>and</strong> there is a cooling request (Y1 or Y2), then it is possible<br />

the G connection has not been made to the unit terminal block.<br />

An alert is initiated for this condition as continuous fan operation<br />

<strong>and</strong> manual fan control may not be possible. Cooling is<br />

started, if allowed, <strong>and</strong> the fan is turned on. The controls do not<br />

diagnose the fan if a heat request (W1 or W2) is in progress.<br />

T430 (Plenum Pressure Safety Switch Trip)<br />

A430 (Plenum Pressure Safety Switch Trip) — If the unit is<br />

configured for fan tracking <strong>and</strong> the plenum pressure switch<br />

trips, the unit will be instructed to shut down immediately. The<br />

first 2 times the switch trips, the unit will automatically start up<br />

<strong>and</strong> clear the alert 3 minutes after the switch recovers. The third<br />

time the switch trips, the unit shuts down <strong>and</strong> calls out the<br />

alarm. Manual reset of the switch (located in the auxiliary control<br />

panel) is required. Software reset is automatic when switch<br />

has been reset. Possible causes are blocked exhaust or return<br />

dampers causing high pressure at the plenum fan.<br />

T500 (Current Sensor Board Failure - A1)<br />

T501 (Current Sensor Board Failure - A2)<br />

T502 (Current Sensor Board Failure - B1)<br />

T503 (Current Sensor Board Failure - B2)<br />

T504 (Current Sensor Board Failure - C1)<br />

T505 (Current Sensor Board Failure - C2) — If the current<br />

sensor board malfunctions or is not properly connected to its<br />

assigned digital input, an alert will be generated. It takes 2 to 4<br />

seconds to log the alert. If the alert is logged, it stays active for<br />

a minimum of 15 seconds to provide the application a reasonable<br />

time to catch the failure. Compressors will be not be inhibited<br />

by this failure. Recovery is automatic. Reason for failure<br />

may be a faulty current sensor board, incorrect wiring, or a<br />

damaged input on the MBB control board.<br />

T610 (Economizer Actuator Out of Calibration)<br />

A620 (Economizer 2 Actuator Out of Calibration)<br />

T630 (Humidifier Actuator Out of Calibration)<br />

A640 (Heating Coil Actuator Out of Calibration)<br />

A650 (Bldg.Press. Actuator 1 Out of Calibration)<br />

A660 (Bldg.Press. Actuator 2 Out of Calibration) — Each<br />

of the actuators must have a minimum control range to operate.<br />

If the actuator, after a calibration, has not learned a control<br />

range appropriate for the application, this alarm/alert will be<br />

sent. No action will be taken on this error. Recovery is automatic.<br />

Reason for failure may be an obstruction or stuck linkage<br />

that prevents full range calibration.<br />

T611 (Economizer Actuator Comm Failure)<br />

A621 (Economizer 2 Actuator Comm Failure)<br />

T631 (Humidifier Actuator Communication Failure)<br />

A641 (Heating Coil Actuator Comm Fail)<br />

A651 (Bldg.Press. Actuator 1 Comm Failure)<br />

A661 (Bldg.Press. Actuator 2 Comm Failure) — Each of<br />

the actuators communicates over the local equipment network<br />

(LEN). If this error occurs, then it is impossible to control the<br />

actuator. Depending on the function of the actuator, the control<br />

will shut down any process associated with this actuator.<br />

Recovery is automatic. Reason for failure may be incorrect

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