Carrier 50PG03-07 Specifiche Scaricare il pdf (Pagina 28)

Once the _lly occupied &impel position has been deter-

mined, set the maximum dmnper demand control ventilation

potentiometer to this position. Do not set to the maximum

position as this can result in over-ventilation to the space and

potential high humidity levels.

CO.2 Sensor Configuration -- Tile CO2 sensor has preset

standard voltage settings that can be selected anytime after the

sensor is powered up. See Table 4.

Use setting 1 or 2 for CmTier equipment.

1. Press Clem and Mode buttons. Hold fit least 5 seconds

until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appeal:

3. Use the Up/Down button to select the preset numbel: See

Table 4.

4. Press Enter to lock in the selection.

5. Press Mode to exit and resume normal operation.

The custom settings of the CO2 sensor can be changed any-

time after the sensor is energized. Follow the steps below to

change the non-standard settings:

1. Press Clem and Mode buttons. Hold fit least 5 seconds

until the sensor enters the Edit mode.

2. Press Mode twice. The STDSET Menu will appem:

3. Use the Up/Down button to toggle to the NONSTD menu

and press Enter.

4. Use the Up/Down button to toggle through each of the

nine variables, starting with Altitude, until the desired set-

ting is reached.

5. Press Mode to move through the vmiables.

6. Press Enter to lock in the selection, then press Mode to

continue to the next variable.

Dehumidification of Fresh Air with DCV (Demand Con-

trolled Ventilation) Control --Information from ASHRAE

(American Society of Heating, Refrigeration, and Air Condi-

tioning Engineers) indicates that the lmgest humidity load on

any zone is the fresh air introduced. For some applications, a

device such as a 62AQ energy recoveU unit is added to reduce

the moisture content of the fresh air being brought into the

building when the enthalpy is high. In most cases, the normal

heating and cooling processes are more than adequate to re-

move the humidity loads for most commercial applications.

This makes the control of the of the dehumidification device

simple when using the enthalpy or differential enthalpy sensol:

The enthalpy sensor or differential enthfdpy sensor is installed

on the equipment to determine economizer operation. The high

enthalpy signal from the enthalpy sensor or differential en-

thalpy sensor can be used to turn on the outdoor air moisture

removal device any time fl'esh air is required for the space.

The energy recoveU device should be sized for maximum

latent and sensible conditioning fit maximum ventilation on a

design day. A cfdculation for leaving-air temperature on a low

ambient, low ventilation day should also be done to determine

the mixed-air temperature of the return and pre-conditioned

outside all: The design should produce an air temperature

somewhat ne_u room conditions to prevent reheat of the air

mixture. The energy recovery device should be interlocked

with the heat to turn off the device when in the heat mode.

Step 9 -- Install All Accessories -- After all of the

factory-installed options have been adjusted, install all field-

installed accessories. Refer to the accessory installation instruc-

tions included with each accessory. Consult the C_rier Price

Pages or RTU (rooftop unit) Building software for accessory

package numbers for pm-ticulm applications.

SETTING

Table 4-- 002 Sensor Standard Settings

EQUIPMENT ANALOG

OUTPUT

Interface w/Standard

Building Control System

Economizer

Health & Safety

Parking/Air Intakes/

Loading Docks

OUTPUT

Proportional

Exponential

Proportional

Exponential

Proportional

VENTILATION

RATE

(cfm/Pereon)

Any

O-1OV

4-20 mA

2-10V

7-20 mA

O-1OV

4-20 mA

O-1OV

4-20 mA

0-10V

4-20 mA

O-1OV

4-20 mA

0-10V

4-20 mA

O-1OV

4-20 mA

0-10V

4-20 mA

CO2

CONTROLRANGE

(ppm)

0-2000

0-1100

O- 900

0-1100

0- 900

0-9999

0-2000

OPTIONAL

RELAY SETPOINT

(ppm)

1000

1100

900

1100

900

5000

7OO

RELAY

HYSTERESIS

(ppm)

5O0

1 2 ... 23 24 25 26 27 28 29 30 31 32 33 ... 48 49

Commenti su questo manuale

Nessun commento

Carrier 50PG03-07 Specifiche Pagina 28

Commenti su questo manuale

Prodotti e manuali riguardandi no Carrier 50PG03-07