Carrier 33CS User Manual

Carrier Comfort System

A Guide To Operating

Your VVT System

33CS

VVTT System

Monitor Thermostat With Timeclock

NOTE TO INSTALLER

This manual should be left with the equipment owner.

GENERAL

This manual will assist you in using your Carrier Comfort
System thermostat. There are 2 basic types of thermostats
that you may encounter. They are called the monitor ther­mostat and the zone controller.

The monitor thermostat can be identified by the system
switches (FAN, HEAT, COOL) which are located along the
bottom edge of the front cover. The monitor thermostat can
be equipped with or without a timeclock. The timeclock dis­play is located in the upper right corner of the monitor ther­mostat. The monitor thermostat display is located in the up­per left corner. The set point and programming buttons are
located around the display.

The zone controller does not have system switches or a
timeclock. The zone controller display is located in the up­per left corner of the zone controller. The set point and pro­gramming buttons are located around the display.

Zone Controller

There are three typical operations you may perform on
your VVT (variable volume and temperature) system
thermostat:

• change set points for heating and cooling

• override the unoccupied schedule

• change occupancy schedules
NOTE: Your ability to perform these functions may be lim-

ited by the security access level function which is config­ured by the installer. If ‘‘accessdenied’’is shown on the dis­play screen, you are not allowed to access that function.

The monitor thermostat and zone controller are part of a
VVT system. The VVT system allows a single-zone heating/
cooling unit to operate as a multiple-zone system. The con­ditioned space is divided into zones. Each comfort zone is
monitored by a zone controller.The monitor thermostat moni­tors the operation of its own zone and of each associated
zone controller and determines system operation from in­formation received from each device that it controls.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.

Book 1 4
Tab 11a 13a

PC 111 Catalog No. 809-247 Printed in U.S.A. Form VVT-2SO Pg 1 10-95 Replaces: New

OPERATION

ElectronicTimeclock (Monitor Thermostat Only)
—

To set the clock, remove the cover of the thermostat. Two
buttons, located under the timeclock, are provided to set the
clock. They are labeled select and adjust. Press the select
button. The minutes setting on the clock will flash. Press the
adjust button until the correct minutes are shown. Press the
select button. The hour setting will flash. Press the adjust
button until the correct hour is shown (including AM and
PM). Press the select button again and the day of the week
will flash. Press the adjust button until the correct day is shown.
Press the select button to return to normal timeclock
operation.

System Switches (Monitor Thermostat Only) —

The monitor thermostat operation mode is controlled by 3
system switches: FAN, HEAT, COOL. See Fig. 1.

The FAN switch can be set to ON or AUTO. When the
FAN switch set to ON, the fan will run continuously. When
the FAN switch is set to AUTO, the fan will only run during
heating and cooling.

The COOL switch can be set to OFF or AUTO. When the
COOL switch set to OFF, the VVTt system will not enter
cooling mode. When the COOL switch is set to AUTO, the
VVT system will enter cooling mode when the zone tem­perature rises above the cooling set point.

The HEAT switch can be set to OFF or AUTO. When the
HEATswitch set to OFF,theVVTsystem will not enter heat­ing mode. When the HEAT switch is set to AUTO, the VVT
system will enter heating mode when the zone temperature
drops below the heating set point.

System Displays — The monitor thermostat and zone

controller have a display window which is used to show sys­tem information and for programming mode. See Fig. 1.

SET POINT DISPLAY — The heating and cooling set points
are shown in the display window during the normal display
mode. The heating and cooling set points are used to deter­mine the range of temperatures that are maintained in the
zone.

The cooling set point buttons are located on the left side
of the display screen. The heating set point buttons are lo­cated on the right side of the display screen.

MODE DISPLAY — When the system fan is energized, the
word FAN appears on the display screen.

When the cooling mode is energized, the word COOL ap­pears on the display screen. The system fan will also be
energized.

When the heating mode is energized, the word HEAT ap­pears on the display screen. The system fan will also be en­ergized, unless it is configured not to run during heating mode.

If the system enters IAQ (indoor air quality) mode, the
word IA9 appears on the display screen.

If the zone controller energizes its supplemental heat source,
the word SUP appears on the display screen.

ALTERNATE DISPLAY— By pressing both cooling or heat­ing set point buttons simultaneously, the alternate informa­tion display is activated. The monitor thermostat or zone
controller will display the current zone temperature and then
the time of day. If the Alternate Display function has been
configured to ON, the monitor thermostat or zone controller
will show more detailed zone information. The display will
then return to normal.

Adjustment of Set Points — The cooling and heat-

ing set points are configured through the set point buttons.

Fig. 1 — VVT System Functions and Displays

(Monitor Thermostat Shown)

The heating set point buttons are located on the right side
of the display screen. Press the upper button to raise the heat­ing set point temperature. Press the lower button to lower
the heating set point temperature. The heating set point is
limited to a range of 66 to 80 F by the VVT system.

The cooling set point buttons are located on the left side
of the display screen. Press the upper button to raise the cool­ing set point temperature. Press the lower button to lower
the cooling set point temperature. The cooling set point is
limited to a range of 66 to 80 F by the VVT system.

NOTE: The heating and cooling set point ranges can be con­figured to smaller ranges.

The heating and cooling set points may be set for the same
temperature, but the thermostat will not allow the cooling
set point to be adjusted lower than the heating set point, or
the heating set point to be adjusted higher than the cooling
set point.

Operating Modes — The monitor thermostat and zone

controller have 3 operating modes: occupied mode, unoc­cupied mode, and unoccupied override. Occupied mode is
the mode used when the area is normally occupied. Unoc­cupied mode is used to conserve energy and is used when
the area is normally unoccupied. Unoccupied override is used
to temporarily override unoccupied mode when an area is in
use during the unoccupied schedule time. The user can manu­ally activate unoccupied override. Set points can be adjusted
during both occupied and unoccupied override modes.

The occupied schedule controls when the zone is in oc­cupied or unoccupied mode. The schedule can be sent from
a device over the network, or it can be programmed at the
monitor thermostat or zone controller.

UNOCCUPIED OVERRIDE — Unoccupied override is used
to temporarily change the system set points to the occupied
mode set points during unoccupied mode operation. An ex­ample of unoccupied override would be a worker staying
past 6:00 PM to finish a job when the scheduled unoccupied
time is 6:00 PM.

To override unoccupied mode, press a set point button.
The unoccupied display will be replaced with the occupied
mode display.Themonitor thermostat or zone controller will
automatically return to unoccupied mode when the override
timer expires.

2