Product data

Guide specifications (cont)
E. System Coordination Capabilities
1. VVTt system shall include adjustable mode de-
mand to indicate the minimum number of zones
required to initiate a system heating or cooling
mode.
2. VVT monitor thermostats shall have a communi-
cation range of either 4, 16, or 32 to scan the
system zone controllers and a bypass controller.
3. VVT system shall have the ability to perform a
system communication check to identify the zone
controllers and bypass controller. The check shall
identify their respective unique device identifica-
tion address, whether the device has an error con-
dition, andif the zone control device has arequire-
mentfor heating orcooling(zone heating orcooling
caller).
4. VVT monitor thermostat shall have the ability to
process the information received from its system
zone controllers and determine the suitable sys-
tem mode (heating or cooling).
5. VVT monitor thermostat shall have the capability
to modify the time period used to select the sys-
tem to prevent getting locked into one mode.
6. System shall have an indoor air quality (IAQ) sen-
sor available as an accessory which will measure
the amount of CO
2
present. The amount of out-
side air being sent to the space will be increased if
the reading is above the configured set point. The
IAQ sensor for the system can be wired to the unit
control relay pack or bypass damper. Individual
zoneswith arequirement foranindividual IAQsen-
sor shall have that sensor wired to the damper.
F. VVT Zone Controller
1. Shall have the capability for independent zone
control when used with a with VVT monitor ther-
mostat (excluding direct HVAC unit control.) This
capability shall include, but shall not be limited to:
configuration access protection, sensor calibra-
tion,individualzonesetpoints,occupied/unoccupied
schedule,unoccupied override,displayof setpoints
and zone diagnostic information, remote tempera-
turesensing andaveraging,zone IAQ status,alarm-
ing capability, and metering.
2. Shall have the capability of controlling zone sup-
plemental or auxiliary heat sources, including fan
control when required, independently from cen-
tral HVAC unit fan control. Conversion to sup-
plemental heat capability shall not require the
replacement of the control system.
3. Shall have the capability of providing either pres-
sure independent operation or pressure depen-
dent damper operation. Damper inlet area shall
be adjustable in increments of one square inch.
4. Shall have the capability of reading zone airflow
in cfm, and controlling zone airflow based upon
this information when operating in pressure inde-
pendent mode.
5. Shall have a programmable ventilation mode ca-
pableof providingventilationto its zoneat all times.
The ventilation mode shall have ability to be ter-
minated if the supply-air temperature is not ben-
eficial to the zone.
6. Shallhave theability toestablish adjustable damper
maximum open, minimumopen, anddamper ven-
tilation minimum airflow positions.
7. Shall have the ability to operate an actuator de-
signedfor usein applications requiringgreater than
1 in.wg static pressure for proper operation.
8. Shall be capable of following its own occu-
pied schedule or that its associated VVT monitor
thermostat.
G. Bypass Controller
1. Shall includetheability for damperpre-positioning
to the full open position prior to fan operation.
2. Shall include an automatic heating/cooling
mode temperature change-over cycle with ad-
justable temperature set points to eliminate zone
thermal shock during periods of system mode
change.
3. Shall include central airflow damper position
control of all individual zone dampers from one
location to maximize air balancing operation.
4. Shall include a set-up function to determine and
automatically configure the bypass system maxi-
mum and minimum pressure set points.
5. Shall have the capability of displaying duct tem-
perature, damper position, maximum pressure
set point, and current system static pressure.
6. Shall have the capability to configure and adjust
for maximum airflow open position.
7. Shall have the ability to protect the device con-
figuration from tampering and misuse by provid-
ing levels of security access into the control.
8. Shall have the capability to initiate an IAQ
sequence for its zone upon input from an IAQ
sensor. It shall also have the capability of provid-
ing IAQ control to its individual zone upon input
from its specific IAQ sensor.
9. Shall have the ability to operate in a stand-alone
modeconfiguration withoutbeing networkedinto
the system.
10. Shall have the capability of unit reset for servic-
ing purposes.
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