Carrier 50HJQ004 Installation, Start-Up And Service Instructions Manual page 30

APPLICATION
Outdoor Air Dry Bulb
Differential Dry Bulb
Single Enthalpy
Differential Enthalpy
CO for DCV Control using a
2
Wall-Mounted CO
CO for DCV Control using a
2
Duct-Mounted CO
NOTE: Only one of each part number is required per each Economi$er IV.
*CRENTDIF004A00 and CRTEMPSN002A00 accessories are used on many different base units. As such, these kits may contain parts that
will not be needed for installation.
† 33ZCSENCO2 is an accessory CO
** 33ZCASPCO2 is an accessory aspirator box required for duct-mounted applications.
†† CRCBDIOX005A00 is an accessory that contains both 33ZCSENCO2 and 33ZCASPCO2 accessories.
2500
2000
1500
1000
500
0
0.05
STATIC PRESSURE (in. wg)
Fig. 31 --- Barometric Flow Capacity
30
25
20
15
10
5
0
0.13 0.20 0.22 0.25
STATIC PRESSURE (in. wg)
Fig. 32 --- Outdoor- -Air Damper Leakage
Outdoor Dry Bulb Changeover
The standard controller is shipped from the factory configured for
outdoor dry bulb changeover control. The outdoor- -air and
supply- -air temperature sensors are included as standard. For this
control mode, the outdoor temperature is compared to an
adjustable set point selected on the control. If the outdoor-air
temperature is above the set point, the EconoMi$er IV will adjust
the outdoor-air dampers to minimum position. If the outdoor air
temperature is below the set point, the position of the outdoor air
dampers will be controlled to provide free cooling using outdoor
air. When in this mode, the LED next to the free cooling set point
potentiometer will be on. The changeover temperature set point is
controlled by the free cooling set point potentiometer located on
the control. (See Fig. 35.) The scale on the potentiometer is A, B,
Table 8 — EconoMi$er IV Sensor Usage
Sensor
2
33ZCSENCO2{
Sensor
2
33ZCASPCO2**
sensor.
2
0.15 0.25
C06030
0.30 0.35 0.40 0.45 0.50
C06031
ECONOMI$ER IV WITH OUTDOOR AIR
DRY BULB SENSOR
Accessories Required
None. The outdoor air dry bulb sensor is factory installed.
CRTEMPSN002A00*
HH57AC078
HH57AC078 and CRENTDIF004A00*
33ZCSENCO2
and
or
C, and D. See Fig. 36 for the corresponding temperature
changeover values.
6000
5000
4000
3000
2000
1000
0
0.05 0.10
Fig. 33 --- Return- -Air Pressure Drop
SUPPLY AIR
TEMPERATURE
SENSOR
MOUNTING
LOCATION
SUPPLY AIR
TEMPERATURE
SENSOR
Fig. 34 --- Supply Air Sensor Location
Differential Dry Bulb Control
For differential dry bulb control the standard outdoor dry bulb
sensor is used in conjunction with an additional accessory dry
bulb sensor (part number CRTEMPSN002A00). The accessory
sensor must be mounted in the return airstream. (See Fig. 37.)
Wiring is provided in the EconoMi$er IV wiring harness. (See
Fig. 29.)
In this mode of operation, the outdoor-air temperature is
compared to the return-air temperature and the lower temperature
30
CRCBDIOX005A00{{
0.15 0.20 0.25 0.30
STATIC PRESSURE (in. wg)
0.35
C06032
C06033