Carrier 33ZCVAVTRM Specifications download pdf (Page 48)

Do not run sensor or relay wires in the same conduit or race-

way with Class 1 AC or DC service wiring. Do not abrade, cut,

or nick the outer jacket of the cable. Do not pull or draw cable

with a force that may harm the physical or electrical properties.

Avoid splices in any control wiring.

Perform the following steps to connect the SAT sensor to

the zone controller:

1. Locate the opening in the control box. Pass the sensor

probe through the hole.

2. Drill or punch a

-in. hole in the duct downstream of the

unit, at a location that conforms to the requirements

shown in Fig. 23.

3. Use two field-supplied, self-drilling screws to secure the

sensor probe to the duct. Use field-supplied bushings as

spacers when installing the sensor probe in a duct 6 in. or

less in diameter.

Perform the following steps if state or local code requires

the use of conduit, or if your installation requires a cable length

of more than 8 ft:

1. Remove the center knockout from a field-supplied 4 x

2-in. junction box and secure the junction box to the duct

at the location selected for the sensor probe.

2. Drill a

-in. hole in the duct through the opening in the

junction box.

3. Connect a

-in. nominal field-supplied conduit between

the zone controller enclosure and the junction box.

4. Pass the sensor probe wires through the conduit and insert

the probe in the duct. Use field-supplied bushings as

spacers when installing the sensor probe in a duct 6 in. or

less in diameter.

5. Secure the probe to the duct with two field-supplied self-

drilling screws.

6. If extending cable length beyond 8 ft, use plenum rated,

20 AWG (American Wire Gage), twisted pair wire.

7. Connect the sensor leads to the zone controller’s wiring

harness terminal board at the terminals labeled SAT and

GND.

8. Neatly bundle and secure excess wire.

INDOOR AIR QUALITY SENSOR INSTALLATION —

The indoor air quality (IAQ) sensor accessory monitors carbon

dioxide levels. This information is used to modify the position

of the outdoor air dampers to admit more outdoor air as

required to provide the desired ventilation rate. Two types of

sensors are supplied. The wall sensor can be used to monitor

the conditioned air space; the duct sensor monitors the return

air duct. Both wall and duct sensors use infrared technology to

measure the levels of CO

present in the air. The wall sensor is

available with or without an LCD (liquid crystal display) read-

out to display the CO

level in ppm. See Fig. 24.

The sensor part number is 33ZCSENCO2. To mount the

sensor, refer to the installation instructions shipped with the

accessory kit.

The CO

sensors (33ZCSENCO2) factory set for a range of 0

to 2000 ppm and a linear voltage output of 0 to 10 vdc. Figure 25

shows ventilation rates for various CO

set points when outside

air with a typical CO

level of 350 ppm is used. Refer to the

instructions supplied with the CO

sensor for electrical require-

ments and terminal locations. The zone controller requires a

24 vac, 25 va transformer to provide power to the sensor.

To convert the CO

sensor into a duct-mounted CO

sensor,

the duct-mounted aspirator (33ZCASPCO2) will need to be

purchased.

To accurately monitor the quality of the air in the condi-

tioned air space, locate the sensor near the return air grille so it

senses the concentration of CO

leaving the space. The sensor

should be mounted in a location to avoid direct breath contact.

Do not mount the space sensor in drafty areas such as near

supply ducts, open windows, fans, or over heat sources. Allow

at least 3 ft between the sensor and any corner. Avoid mounting

the sensor where it is influenced by the supply air; the sensor

gives inaccurate readings if the supply air is blown directly onto

the sensor or if the supply air does not have a chance to mix with

the room air before it is drawn into the return air stream.

To accurately monitor the quality of the air in the return air

duct, locate the sensor at least 6 in. upstream or 15 in.

downstream of a 90-degree turn in the duct. The downstream

location is preferred. Mount the sensor in the center of the duct.

IMPORTANT: If the sensor is mounted in the return-air

duct, readjust the mixed-air dampers to allow a small

amount of air to flow past the return-air damper when-

ever the mixing box is fully open to the outside air. If the

damper is not properly adjusted to provide this mini-

mum airflow, the sensor may not detect the indoor-air

quality during the economizer cycle.

AIR

TERMINAL

UNIT

OCTOPUS

HEAT

SAT

2 FT. MIN.

PRIMARY

AIR INLET

AIR

TERMINAL

UNIT

HEAT

SAT

2 FT. MIN.

PRIMARY

AIR INLET

ZC — Zone Controller

Fig. 23 — Supply Air Temperature Probe

(Part No. 33ZCSENSAT) Locations

UNIT WITH ELECTRIC REHEAT

UNIT WITH OCTOPUS

DRILL 1/4" HOLE

IN TOP OF DUCT

AND LET SENSOR

HANG DOWN

ALTERNATE INSTALLATION

LOCATION INSIDE OF DUCT

SUPPLY DUCT

Fig. 22 — DAT Installation Location

1 2 ... 43 44 45 46 47 48 49 50 51 52 53 ... 315 316

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Carrier 33ZCVAVTRM Specifications Page 48

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