06.03.2013 Views

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

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

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

SHOW MORE
SHOW LESS

You also want an ePaper? Increase the reach of your titles

YUMPU automatically turns print PDFs into web optimized ePapers that Google loves.

TEMPERATURE COMPENSATED START LOGIC — The<br />

following conditions must be met for the algorithm to run:<br />

• Unit is in unoccupied state.<br />

• Next occupied time is valid.<br />

• Current time of day is valid.<br />

• Valid space temperature reading is available (sensor or<br />

DAV-Linkage).<br />

The algorithm will calculate a <strong>Start</strong> Bias time in minutes using<br />

the following equations:<br />

If (space temperature > occupied cooling set point)<br />

<strong>Start</strong> Bias Time = (space temperature – occupied cooling set<br />

point)* TCS.C<br />

If (space temperature < occupied heating set point)<br />

<strong>Start</strong> Bias Time = (occupied heating set point – space<br />

temperature)*TCS.H<br />

When the <strong>Start</strong> Bias Time is greater than zero the algorithm<br />

will subtract it from the next occupied time to calculate the new<br />

start time. When the new start time is reached, the Temperature<br />

Compensated <strong>Start</strong> mode is set (Operating ModesMODE<br />

T.C.ST), the fan is started <strong>and</strong> the unit controlled as in an occupied<br />

state. Once set, Temperature Compensated mode will stay<br />

on until the unit goes into the Occupied mode. The <strong>Start</strong> Bias<br />

Time will be written into the CCN Linkage Equipment Table if<br />

the unit is controlled in DAV mode. If the Unoccupied Economizer<br />

Free Cool mode is active (Operating ModesHVAC =<br />

“UNOCC FREE COOL”) when temperature compensated<br />

start begins, the Unoccupied Free Cool mode will be stopped.<br />

Carrier Comfort Network ® (CCN) — It is possible<br />

to configure the ComfortLink controls to participate as an element<br />

of the Carrier Comfort Network (CCN) system directly<br />

from the local display. This section will deal with explaining<br />

the various programmable options which are found under the<br />

CCN sub-menu in the Configuration mode.<br />

The major configurations for CCN programming are located<br />

in the local displays at ConfigurationCCN. See Table 61.<br />

CCN Address (CCNA) — This configuration is the CCN address<br />

the rooftop is assigned.<br />

CCN Bus Number (CCNB) — This configuration is the CCN<br />

bus the rooftop is assigned.<br />

CCN Baud Rate (BAUD) — This configuration is the CCN<br />

baud rate.<br />

CCN Time/Date Broadcast (TM.DT) — If this configuration<br />

is set to ON, the control will periodically send the time <strong>and</strong> date<br />

out onto the CCN bus once a minute. If this device is on a CCN<br />

network then it will be important to make sure that only one<br />

device on the bus has this configuration set to ON. If more than<br />

one time broadcaster is present, problems with the time will<br />

occur.<br />

NOTE: Only the time <strong>and</strong> date broadcaster can perform<br />

daylight savings time adjustments. Even if the rooftop is st<strong>and</strong><br />

alone, the user may want to set this to ON to accomplish the<br />

daylight/savings function.<br />

CCN OAT Broadcast (OAT.B) — If this configuration is set<br />

to ON, the control will periodically broadcast its outside-air<br />

temperature at a rate of once every 30 minutes.<br />

CCN OARH Broadcast (ORH.B) — If this configuration is<br />

set to ON, the control will periodically broadcast its outside air<br />

relative humidity at a rate of once every 30 minutes.<br />

CCN OAQ Broadcast (OAQ.B) — If this configuration is set<br />

to ON, the control will periodically broadcast its outside air<br />

quality reading at a rate of once every 30 minutes.<br />

Global Schedule Broadcast (G.S.B) — If this configuration is<br />

set to ON <strong>and</strong> the schedule number (SCH.N) is between 65 <strong>and</strong><br />

99, then the control will broadcast the internal time schedule<br />

once every 2 minutes.<br />

83<br />

CCN Broadcast Acknowledger (B.ACK) — If this configuration<br />

is set to ON, then when any broadcasting is done on the<br />

bus, this device will respond to <strong>and</strong> acknowledge. Only one device<br />

per bus can be configured for this option.<br />

Schedule Number (SCH.N) — This configuration determines<br />

what schedule the control may follow.<br />

SCH.N = 0 The control is always occupied.<br />

SCH.N = 1 The control follows its internal time schedules.<br />

The user may enter any number<br />

between 1 <strong>and</strong> 64 but it will be overwritten<br />

to “1” by the control as it only has one<br />

internal schedule.<br />

SCH.N = 65-99 The control is either set up to receive to a<br />

broadcasted time schedule set to this<br />

number or the control is set up to broadcast<br />

its internal time schedule (G.S.B) to the<br />

network <strong>and</strong> this is the global schedule<br />

number it is broadcasting. If this is the case,<br />

then the control still follows its internal time<br />

schedules.<br />

Accept Global Holidays? (HOL.T) — If a device is broadcasting<br />

the time on the bus, it is possible to accept the time yet<br />

not accept the global holiday from the broadcast message.<br />

Override Time Limit (O.T.L) — This configuration allows<br />

the user to decide how long an override occurs when it is initiated.<br />

The override may be configured from 1 to 4 hours. If the<br />

time is set to 0, the override function will become disabled.<br />

Timed Override Hours (OV.EX) — This displays the current<br />

number of hours left in an override. It is possible to cancel an<br />

override in progress by writing “0” to this variable, thereby<br />

removing the override time left.<br />

SPT Override Enabled? (SPT.O) — If a space sensor is present,<br />

then it is possible to override an unoccupied period by<br />

pushing the override button on the T55 or T56 sensor. This<br />

option allows the user to disable this function by setting this<br />

configuration to NO.<br />

T58 Override Enabled? (T58.O) — The T58 sensor is a CCN<br />

device that allows cooling/heating set points to be adjusted,<br />

space temperature to be written to the rooftop unit, <strong>and</strong> the ability<br />

to initiate a timed override. This option allows the user to<br />

disable the override initiated from the T58 sensor by setting<br />

this option to NO.<br />

Global Schedule Override? (GL.OV) — If the control is set<br />

to receive global schedules then it is also possible for the global<br />

schedule broadcaster to call out an override condition as well.<br />

This configuration allows the user to disable the global schedule<br />

broadcaster from overriding the control.<br />

Alert Limit Configuration — The ALLM submenu is<br />

used to configure the alert limit set points. A list is shown in<br />

Table 62.<br />

SPT Low Alert Limit/Occ (SP.L.O) — If the space temperature<br />

is below the configurable occupied SPT Low Alert Limit<br />

(SP.L.O), then Alert 300 will be generated <strong>and</strong> the unit will be<br />

stopped. The alert will automatically reset.<br />

SPT High Alert Limit/Occ (SP.H.O) — If the space temperature<br />

is above the configurable occupied SPT High Alert Limit<br />

(SP.H.O), then Alert 301 will be generated <strong>and</strong> the unit will be<br />

stopped. The alert will automatically reset.<br />

SPT Low Alert Limit/Unocc (SP.L.U) — If the space temperature<br />

is below the configurable unoccupied SPT Low Alert<br />

Limit (SP.L.U), then Alert 300 will be generated <strong>and</strong> the unit<br />

will be stopped. The alert will automatically reset.<br />

SPT High Alert Limit/Unocc (SP.H.U) — If the space temperature<br />

is above the configurable unoccupied SPT High Alert<br />

Limit (SP.H.U), then Alert 301 will be generated <strong>and</strong> the unit<br />

will be stopped. The alert will automatically reset.

Hooray! Your file is uploaded and ready to be published.

Saved successfully!

Ooh no, something went wrong!