Carrier 50PG03-07 Dokumentacja Pobierz pdf (Strona 24)

18 %'*_ LEDON

16- -- - LED OFF

E14

40 45 50

LED ON

55 60 65 70 75 80

DEGREES FAHRENHEIT

Fig. 15 -- Temperature Changeover Set Points

--m,

TRD --

EF B

EF1

Fig. 16 -- EconoMi$er IV Control

EXHAUST

FAN SET POINT

LED LIGHTS

WHEN EXHAUST

CONTACT iS MADE

MINIMUM DAMPER

POSITION SETTING

MAXIMUM DAMPER

DEMAND CONTROL

VENTILATION SET POINT

LED LIGHTS WHEN

DEMAND CONTROL

VENTILATION INPUT

iS ABOVE SET POINT

DEMAND CONTROL

VENTILATION SET POINT

LED LIGHTS WHEN

OUTDOOR AiR iS

----x (

SUITABLE FOR

FREE COOLING

ENTHALPY

CHANGEOVER SET POINT

Fig. 17 -- EconoMi$er IV Controller Potentiometer

and LED Locations

Indoor Air Quality (IAQ) Sensor Input -- The IAQ input

can be used for demand control ventilation control based on the

level of CO2 measured in the space or return air duct.

Mount the optional IAQ sensor according to manufacturer

specifications. The IAQ sensor should be wired to the AQ and

AQI terminals of the controller Adjust the DCV potentiome-

ters to correspond to the DCV voltage output of the indoor air

quCdity sensor at the user-determined set point. See Fig. 19.

If a separate field-supplied transformer is used to power the

IAQ sensor, the sensor must not be grounded or the

EconoMiSer [V control board will be &_maged. See Fig. 14.

Power Exhaust -- The factory-installed power exhaust will be

factory wired and installed. [f an accessory power exhaust is to

be installed, see the accessory power exhaust installation in-

structions included with the power exhaust for inst_dlation and

wiring. The wiring plug on the power exhaust is connected to

wiring harness plug PLI-3,4.

Exhaust Set Point Adjustment -- The exhaust set point will

determine when the exhaust fan runs based on damper position

(if accessory power exhaust is installed). The set point is modi-

fied with the Exhaust Fan Set Point (EXH SET) potentiometer.

The set point represents the &Lmper position above which the

exhaust fans will be turned on. When there is a call for exhaust,

the EconoMi$er IV controller provides a 45 _+15 second delay

before exhaust fan activation to allow the dampers to open.

This delay allows the damper to reach the appropriate position

to avoid unnecessary fan overload.

Minimum Position Control -- There is a minimum damper

position potentiometer on the EconoMiSer IV controllel: See

Fig. 17. The minimum dmnper position maintains the mini-

mum airflow into the building during the occupied period.

When using demand ventilation, the minimum &tmper po-

sition represents the minimum ventilation position for VOC

(volatile organic compounds) ventilation requirements. The

maximum demand ventilation position is used for fully occu-

pied ventilation.

When demand ventilation control is not being used, the

minimum position potentiometer should be used to set the

occupied ventilation position. The maximum demand ventila-

tion position should be turned lully clockwise.

Adjust the minimum position potentiometer to _dlow the

minimum amount of outdoor air, as required by local codes, to

enter the building. Make minimum position adjustments with

at least 10° F temperature difference between the outdoor and

return-air temperatures.

To determine the minimum position setting, perform the

following procedure:

1. Calculate the appropriate mixed air temperature using the

following formula:

(To x OA) + (TR x RA) = TM

To = Outdoor-Air Temperature

OA = Percent of Outdoor Air

TR = Return-Air Temperature

RA = Percent of Return Air

TM = Mixed-Air Temperature

As an example, if local codes require 10% outdoor air

during occupied conditions, outdoor-air temperature is

60 K and return-air temperature is 75 IF.

(60 x. 10) + (75 x .90) = 73.5 F

2. Disconnect the mixed air sensor fiom terminals T and TI.

3. Ensure that the factory-installed jumper is in place across

terminals P and PI. If remote &_mper positioning is being

used, make sure that the terminals are wired according to

Fig. 14 and that the minimum position potentiometer is

turned fully clockwise.

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 48 49

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