Elta T210 Specifications download pdf (Page 78)

BUILDING PRESSURE SENSOR HIGH END (BPHL) —

This is used to configure the building pressure value that will

correspond to a 20 mA signal from the sensor.

BUILDING PRESSURE SENSOR LOW END (BPLL) —

This is used to configure the building pressure value that will

correspond to a 4 mA signal from the sensor.

BP THRESHOLD ADJUSTMENT (BP.ZG) — This is a

factor that is used to adjust the control PID loop. Normally this

should not have to be adjusted.

BP PID EVALUATION (BP.DT) — This is a PID loop

adjustment factor. Do not change this without direction from

Application Engineering.

HIGH BP LEVEL (BP.HP) — This is the high limit for the

routine 2 at which a fan stage will be added. Do not change this

value.

LOW BP LEVEL (BP.LP) — This is the low limit for the

routine 2 at which a fan stage will be removed. Do not change

this value.

Space Temperature Offset — The control provides

capability for CV units to offset a space temperature set point

by ± 1 to10 F, using a T56 device. The T56 slider analog input

is linearized by the software into the –(1-10) to +(1-10) F

range, and uses the STO.R configuration to set the range which

is located in the CONFIGURATION-OPTS submenu and the

Space Temperature Offset (SPTO) read the offset value. The

SPTO can be read in the TEMPERATURE-UNIT submenu.

The SPTO offset is applied to the error term during the

occupied period only.

It will be applied as follows:

The error term equals the occupied set point (OCSP or

OHSP) + SPTO – SPT.

NOTE: This must be used with HVACSPT2 control.

Temperature Compensated Start — This logic is

used when the unit is in unoccupied state. It will calculate early

Start Bias time based on Space Temperature deviation from

occupied set points. This will allow the control to learn when to

start the unit so that the space is at conditioned levels when the

occupied period starts. This is required for ASHRAE 90.1

compliance.

The following conditions must be met for the algorithm to

run:

• Unit in unoccupied state

• Next occupied time is valid

• Current time of day is valid

• Valid Space Temperature reading is available (sensor or

DAV-Linkage)

The algorithm will calculate Start Bias time (BIASTIME) in

minutes using the following equations:

If (space temperature > occupied cooling set point)

BIASTIME = (space temperature – occupied cooling set

point)* C.TC.F

If (space temperature < occupied heating set point)

BIASTIME = (occupied heating set point – space tempera-

ture)* H.TC.F

When BIASTIME > 0 the algorithm will subtract it from

the next occupied time to calculate the new start time. When

the new start time is reached, the Temperature Compensated

Start mode is set, the fan is started and the unit controlled as in

occupied state. Once set, Temperature Compensated Mode will

stay on until the unit goes into occupied mode. The Start Bias

Time will be written into the Linkage Equipment Table if the

unit is controlled in DAV mode.

If Unoccupied Economizer Free Cool mode is active

(MODEUEFC) when Temperature Compensated Start begins,

the Unoccupied Free Cool mode will be stopped.

The following configurations are required for this logic:

TCST COOL TIME/TEMP FACT (C.TC.F) — This is located

in the CONFIGURATION-COOL submenu and is the factor

for the start time bias equation for cooling.

TCST HEAT TIME/TEMP FACT (H.TC.F) — This is located

in the CONFIGURATION-HEAT submenu and is the factor

for the start time bias equation for heating.

Smoke Control Modes — There are four smoke con-

trol modes that can be used to control smoke within areas

serviced by the unit: Pressurization Mode, Evacuation Mode,

Smoke Purge Mode, and Fire Shutdown. Evacuation, Pressur-

ization and Smoke Purge modes require the Controls Expansion

Board (CEM). The Fire Shutdown input is located on the main

board (MBB) on terminals TB5-10 and TB5-11. The unit may

also be equipped with a factory-installed return air Smoke

Detector that is wired to TB5-10,11 and will shut the unit down

if a smoke condition is determined. On terminal TB5-8 and 9,

field-monitoring wiring can be connected to also monitor the

smoke detector.

Once in a fire shutdown condition, additional inputs on the

CEM board can be used to put the unit in the Pressurization,

Evacuation, and Smoke Purge Modes. These switches or inputs

are connected to TB6 as shown below and on Fig. 7.

Pressurization — TB5-12 and 13

Evacuation — TB5-13 and 14

Smoke Purge — TB5-13 and 15

Each mode must be energized individually on discrete

inputs and the corresponding alarm is initiated when a mode is

activated. The fire system provides a normally closed dry

contact closure.

FIRE SHUTDOWN MODE — This mode causes the com-

plete shutdown of the unit.

PRESSURIZATION MODE — This mode attempts to raise

the pressure of a space to prevent smoke infiltration from

another space. The space with smoke should be in an

Evacuation Mode attempting to lower its pressure. Opening the

economizer (thereby closing the return air damper), shutting

down power exhaust and turning the indoor fan on will

increase pressure in the space.

EVACUATION MODE — This mode attempts to lower the

pressure of the space to prevent infiltrating another space with

its smoke. Closing the economizer (thereby opening the return

air damper), turning on the power exhaust and shutting down

the indoor fan decrease pressure in the space.

SMOKE PURGE MODE — This mode attempts to draw out

smoke from the space after the emergency condition. Opening

the economizer (thereby closing the return air damper), turning

on both the power exhaust and indoor fan will evacuate smoke

and bring in fresh air.

The following configurations apply to the fire and smoke

control operation.

IDF SPEED IN FIRE MODE (SF.FS) — This is the VFD

speed that will be used when the fire pressurization and purge

modes are enabled. To use this, the unit must be configured

with the Static Pressure Control (SP.C) variable set to VFD

control. This method should be used instead of tying in to the

VFDs which also have a means for fire override control.

EVACUATION SW NORMALLY (EVC.L) — This is located

in the CONFIGURATION-SW.LG submenu and is used to

configure the normally open/closed status of the switch.

FILTER STATUS NORMALLY (FTS.L) — This is located

in the CONFIGURATION-SW.LG submenu and is used to

configure the normally open/closed status of the switch.

FIRE SHUTDOWN NORMALLY (FSD.L) — This is located

in the CONFIGURATION-SW.LG submenu and is used to

configure the normally open/closed status of the switch.

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Elta T210 Specifications Page 78

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