Specifications

ManualsBrandsCarrier ManualsConsumer electronicsCARRIER COMFORT SYSTEM 33CS

Device Bus Number — There can be many different

communication busses connected in a single system. There

is one primary bus and up to 239 secondary busses which

reside on the primary bus. The primary bus is always bus

number 0. The secondary bus address must be between

1 and 239. The monitor thermostat bus address must be en-

tered into the Device Bus Number conﬁguration. The

default is 0. Acceptable values range from 0 to 239. The

Device Bus Number is set in category 8, option 3.

A maximum of 32 devices, with no more than 8 monitors

(scanners), are allowed on each communication bus. The maxi-

mum length of a communication bus is 4000 ft (four

1000 ft segments joined by 3 CCN repeaters). Secondary buses

can be established by using a bridge module and also have

the same 32 devices, with no more than 8 monitors (scan-

ners), capacity.

The primary number is always 0. Secondary network buses

can be added by using a network bridge module. This sec-

ondary bus has a bus number equal to the device address of

the bridge module. Any thermostats (monitor, zone control-

ler, bypass controller) on this secondary bus must have their

device bus number set equal to the device address of the bridge

module.

Device Access Security Level — The device ac-

cess security level is used to limit access to the monitor ther-

mostat functions by unauthorized personnel. The security level

is conﬁgured in category 8, option 2. The factory setting

is 1. The range of acceptable security levels is 1 to 4.

The following details the amount of access limitation each

security level provides when programming locally at the moni-

tor thermostat (other network systems, such as Building Su-

pervisor, can still access and program the monitor thermo-

stat functions).Access security level 1 allows full programming

of the monitor thermostat. Access security level 2 allows pro-

gramming of occupied set points, occupancy schedules, and

holiday schedules. Access security level 3 allows program-

ming of occupied heating and cooling set points only. Ac-

cess security level 4 allows no programming.

Do not leave the access security level option at 1 after

conﬁguration is complete. Untrained or unauthorized

users may change set points or other important

information.

If the access security level is changed from 1, the access

security level cannot be changed in the normal method be-

cause programming is locked out (for local programming only).

To reconﬁgure the access security level of the monitor ther-

mostat, activate the alternate information display by simul-

taneously pressing the upper and lower set point buttons. Once

the alternate information is activated the monitor thermostat

will begin to display a sequence of information in the order

described in the Alternate Information Display section on

page 15. When the display shows the access security level

number, press any button to freeze the display. Then press

both the heating and cooling buttons to enter the Program-

ming mode. Reconﬁgure category 8, option 2 to the desired

security level. Be sure to hit the enter button after the de-

sired security level has been made.

Monitor Type (Scanning Control) — The Monitor

Thermostat can be conﬁgured to operate as 3 different system-

speciﬁc types of monitors:

• as a VVTt Monitor Thermostat. The monitor is used in a

VVT system to control the heating/cooling equipment op-

eration based on its zone requirements and the require-

ments of the associated zone controllers.

• as a VVT Monitor-Only Thermostat. The monitor thermo-

stat is used in a VVT system to control the heating/cooling

equipment operation based on the zone demand of the as-

sociated zone controllers.

• as a VVT Construction thermostat (on a temporary basis).

The monitor thermostat is used in a construction site to

control the heating/cooling equipment operation based on

its own zone requirements. It is used to provide heating or

cooling to a site before all the remaining associated con-

trollers and system elements are installed.

The monitor thermostat is conﬁgured to operate as one of

the 3 system types by conﬁguring the Scanning Control op-

tion. The Scanning Control option is conﬁgured in category

8, option 4. The settings are 1, 2, or 3. Setting 1 will cause

the thermostat to act as a VVT monitor thermostat. Setting

2 will cause the thermostat to act as a VVT monitor-only

thermostat. Setting 3 will cause the thermostat to act as a

VVT construction thermostat.

VVT MONITOR THERMOSTAT SYSTEM — The moni-

tor thermostat, conﬁgured for VVT Monitor operation, in a

VVT system application will:

• control the occupied and unoccupied mode conditions in

its zone by modulating a zone damper.

• initiate communication with the associated zone control-

lers to distribute system information or instructions and

collect zone information.

• determine the system requirements for heating and cool-

ing based on its own zone information and the informa-

tion gathered from the associated zone controllers. See

Fig. 17.

To conﬁgure the monitor thermostat for VVT Monitor op-

eration, conﬁgure the Scanning Control option (category 8,

option 4) to 1.

VVT MONITOR ONLY SYSTEM — The monitor thermo-

stat, conﬁgured for VVT Monitor Only System operation, in

a VVT system application will:

• initiate communication with the associated zone control-

lers to distribute system information or instructions and

collect zone information.

• determine the system requirements for heating and cool-

ing based on the information gathered from the associated

zone controllers. See Fig. 18.

To conﬁgure the monitor thermostat for Monitor Only op-

eration, conﬁgure the Scanning Control option (category 8,

option 4) to 2.

VVT MONITOR CONSTRUCTION SYSTEM — The moni-

tor thermostat, conﬁgured for VVT Monitor Construction Sys-

tem operation, in a VVT system application will:

• determine the system requirements for heating and cool-

ing based on the information gathered from its own zone

sensors.

NOTE: In construction mode, the monitor thermostat does

not refer to programmed system lockout or trip limits.

NOTE: When a monitor thermostat is conﬁgured for con-

struction mode the supply air duct sensor will issue a HF-05

alarm (duct temperature sensor out of range) when a duct

sensor is not connected.

To conﬁgure the monitor thermostat for Monitor Con-

struction operation, conﬁgure the Scanning Control option

(category 8, option 4) to 3.