Installation Instructions
Part Numbers 33CSPS--01 and 33CSPS--02
PACKAGE USAGE
PART NUMBER USAGE
33CSPS--01 Applications not exceeding 0.5 in. wg
33CSPS--02 Applications not exceeding 2.0 in. wg
PACKAGE CONTENTS
ITEM QUANTITY
Metal Enclosure 1
Mounting Hardware 1
Circuit Board 1
Sensor Harness 1
Power Harness 1
NOTE: The following items are field supplied:
•
2
⁄
10
in. ID plastic tubing, long enough to be run from pres-
sure probe to sensor mounting location
• 18 gage, insulated, stranded wire, long enough to run from
pressure sensor to damper actuator
• 5 wire nuts
• static pressure pickup (part number 920147), for static pres-
sure control applications
• velocity pressure probe (part number 920148 for 12 in.
device, 920149 for 18 in. device, and 920150 for 26 in.
device) for pressure independent control applications
GENERAL
The Carrier Comfort System pressure sensor is used for
static pressure control and pressure independent control in
VVTt systems. A field-provided pressure probe or pickup is
mounted in the VVT system air duct. The pressure sensor
reads the pressure from the pressure probe/pickup and sends
the information to the VVT system component (zone con-
troller or bypass controller). The pressure information is used
to modulate the bypass or zone dampers when the system is
in static pressure control mode or pressure independent con-
trol mode.
NOTE: These sensors are designed for use with
33CSZC--01 zone controllers and 33CSBC--00 bypass
controllers.
INSTALLATION
IMPORTANT: Read these instructions completely be-
fore attempting to install the pressure sensor.
Perform the following procedure to install the pressure
sensor:
1. Attach the 4 plastic standoffs to the metal enclosure base
with the 4 screws provided.
2. Mount the metal enclosure base to the duct or a suitable
location. The operating environment for the sensor must
remain between 32 to 130 F. The length of the pressure
sensor tubing should not exceed 20 ft. The total length of
the wire between the pressure sensor and the associated
actuator should not exceed 100 ft. Recommended orien-
tation of the sensor is with pneumatic tubing pressure ports
toward the bottom. When properly installed, the pressure
sensor will operate in any mounted position.
3. Push the pressure sensor circuit board down onto the stand-
offs until it locks into place.
4. The sensor wiring harness and power wiring harness should
be attached to the circuit board. If they are not attached,
push the plugs into the connector block on the pressure
sensor circuit board.
5. Install the static pressure pickup or velocity pressure probe
in the desired location. Run the field-supplied
2
⁄
10
in. ID
plastic tubing from the pressure pickup/probe to the pres-
sure sensor. Static pressure control applications will only
use port P1. Port P2 is not used for static pressure control
applications and should remain open to the atmosphere.
Pressure independent control applications will use both
ports P1 and P2. See Fig. 1.
Do not wire pressure sensor or damper actuator while
power is connected. Electrical shock or death could
result.
6. Wire the pressure sensor to the damper actuator using the
sensor wiring harness, field-supplied wire, and 3 field-
supplied wire nuts. Clip and secure the orange, red, and
black wires of the 6-wire section of the sensor wiring har-
ness on the damper circuit board. They are not used. Wire
nut the white, blue, and green wires on the wiring har-
ness of the pressure sensor to the field-supplied wiring
and run to the damper actuator. Connect them to the white,
blue, and green wires on the damper actuator wiring har-
ness. See Fig. 1 and 2.
7. Wire the pressure sensor power wiring to a 24 vac, 5 va
power supply. See Fig. 1.
8. Install pressure sensor enclosure cover. The pressure sen-
sor must be calibrated for proper operation.
Book 1 4
Tab 11a 13a
PC 111 Catalog No. 533-303 Printed in U.S.A. Form 33CS-3SI Pg 1 7-95 Replaces: New
33CS
Carrier Comfort System
Pressure Sensor
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
(72 pages)
(20 pages)
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