Troubleshooting Instructions
GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Display Freeze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
COMMUNICATION . . . . . . . . . . . . . . . . . . . . . . . . . 10,11
Device Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
SENSORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,12
Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Bypass Damper Modulation . . . . . . . . . . . . . . . . . 13
Modulation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
ZD/RD Actuator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Fan On Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Fan Off Delay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
DIAGNOSTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14-18
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1
4
PC 111
Tab
11a 13a
Variable Volume and Temperature (VVT )
Installation, Service and
CONTENTS
Page
Catalog No. 809-246
Printed in U.S.A.
Bypass Controller
ALARM OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Re-Alarm Time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Bypass Controller Communication
Problems . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
GENERAL
This manual provides detailed explanations of the opera-
tion of the Carrier Comfort System bypass controller and
each configurable function. The configurable functions al-
low the operation of the bypass controller to be adjusted to
match specific user needs and system requirements.
The bypass controller is the pressure moderator of the VVT
system. The pressure moderation ability of the bypass con-
troller makes a zoning system with a constant volume HVAC
unit possible. The bypass controller maintains system static
pressure based on the used-configured set point. The bypass
controller regulates system static pressure by opening its damper
when it measures a pressure above the system set point and
closing its damper when it measures a system pressure be-
low the system set point. If the system static pressure is within
3% of the system set point, the damper will remain at its
present position.
The bypass controller will receive the system mode from
the monitor thermostat and will modulate its damper ac-
cording to user-configured settings, system mode, and sen-
sor information. Only one bypass controller should be used
per one monitor thermostat.
NOTE: The 33CSBC--00 bypass controller will only work
with 33CSPS--01 and 33CSPS--02 pressure sensors.
NOTE: The Comfort System (33CS) bypass controller is not
compatible with a VVT Generation II Enhanced or Pre-
Enhanced device. The Carrier 33CS VVT system will not
support Enhanced or Pre-Enhanced devices.
Form VVT-3SI
Pg 1
33CS
Page
7-95
Replaces: New