Specifications
BUS 0
SEE NOTE 5
BUS 0
BRIDGE**
(ADDRESS 0, 1)
BRIDGE**
(ADDRESS 0, 2)
BUS 2
TB
VMT-32
BC
ZC
TR
BUS 1
RNT
VMT-32
VMT-32
TR
TR
RNT
TR
BC
BC
ZC
TR
TR
TR
ZC
ZC
TR
TO UP TO 64 BUSES
ZC
BA
ZC
BA
ZC
ADDITIONAL DEVICES
(SEE NOTE 5)
ADDITIONAL DEVICES
(SEE NOTE 5)
TeLINK
REPEATER*
TR
TR
ZC
ZC
VMT-32
AA
NRT†
TR
TR
BA
BC
ZC
ZC
ADDITIONAL DEVICES
(SEE NOTE 5)
LEGEND
AA — Alarm Acknowledger
BA — Broadcast Acknowledger
CCN — Carrier Comfort Network
NTR — Network Time Requester
RNT — Receive Network Time
TB — (Network) Time Broadcaster
TR — Time Requester
*Maximum length of a CCN bus is 4000 ft (four 1000 ft segments joined by 3 repeaters). When
installing repeaters, install 2 modular power supplies (Part No. CEAS221045-01).
†One Network Time Requester is required per VVT network, unless all monitor thermostats have
a timeclock. The Network Time Requester can reside on any bus segment and in any monitor,
zone controller, or TEMP thermostat. (NOTE: The zone controller must be stand-alone).
**Bridges must be electrically isolated from the primary bus by using a separate power supply on the
CCN bridge.
NOTES:
1. One Time Broadcaster is required per VVT network. The Time Broadcaster can reside on any
bus segment. There is no limit to the amount of controllers that can have timeclocks on a net-
work, however, be sure there is only one Time Broadcaster.
2. ANetwork Time Requester (NTR) can be any VVT or TEMP device without an internal timeclock.
(Zone controller must be stand-alone.)
3. One Broadcast Acknowledger is required per communication bus.
4. One Alarm acknowledger is required per VVT system, and must reside on the primary bus.
5. A maximum of 32 VVT elements are allowed per communication bus, with no more than 8 scan-
ners (monitor thermostats). Other devices that are scanners are: Autodial Gateways, TeLink, Data
Collection/Data Transfer, Comfort Controllers using network points or BEST™ routines on
network.
6. The maximum length of a CCN bus segment is 1000 ft.
7. The Network Time Requester (NTR) does not need to be turned on in a system scanned by a
monitor thermostat. The NTR should be turned on when the zone controller is in stand-alone
mode.
Fig. 32 — Typical VVTT System Set Up
40