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

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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.

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