Carrier 3V VVT 33ZCVVTZC-01 Installation, Start-Up And Configuration Instructions Download Page 43

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Master Zone Maintenance Table —

The Master Zone

Maintenance Table (MZNMAINT) displays variables used by
the Linkage Coordinator zone controller when determining the
system mode (heat/cool/vent). It also indicates whether a by-
pass controller and an air source are being used and which zone
is the reference zone. The user may override cooling or heating
time guards from this table. See Table 17.
DESIRED SYSTEM MODE — This variable will display
the desired operating mode of the air source.
Desired
Operating Mode: Display Range

COOLING, HEATING,
FREECOOL,

PRES-

SURE, EVAC, OFF

Network Access Read only

SYSTEM MODE — This variable will display the current
system mode of the air source, if Linkage is available, or the
mode determined by the Linkage Coordinator using the prima-
ry air sensor, if available. If the primary air sensor has failed or
was not installed, the Linkage Coordinator will assume the
default mode of cooling.
System Mode:

Display Range

COOLING, HEATING,
FREECOOL,

PRES-

SURE, EVAC, OFF

Network Access Read only

AIR SOURCE DETECTED — This variable displays whether
the Linkage Coordinator zone controller has detected a
communicating air source at the address configured in the
Linkage Configuration Table.
Air Source
Detected:

Display Range

Yes/No

Network Access Read only

BYPASS CONTROLLER — This variable displays whether
the Linkage Coordinator zone controller has detected a com-
municating bypass controller as configured in the Linkage
Configuration Table.
Bypass
Controller:

Display Range

Yes/No

Network Access Read only

REFERENCE ZONE DEMAND — This variable displays
the demand of the reference zone. When occupied, the demand
will be a function of T56 bias and configured Occupied

Heating and Cooling set points. When in unoccupied mode, the
demand will be directly related to configured Unoccupied
Heating and Cooling set points.

The reference zone is re-determined on every scan of the

zone controllers which is at a one minute frequency.
Reference Zone
Demand:

Display Range

delta 0.00 to 99.9 F

Network Access Read only

REFERENCE ZONE # — This variable displays the number
of the zone whose heating or cooling needs are the greatest at
any time and that requires the same mode as the system.

For example, if the Desired System Mode is cooling, the

Reference Zone # is that mode that has the greatest cooling
need.

The zones are numbered such that the master zone is zone

number 1 and the zone that is one address below the master
zone is zone number 2 and so on to zone number 32. If the
master zone is at address 0, 118 then zone no. 2 is the zone
controller at address 0, 117 and zone no. 3 is the zone controller
at address 0, 116 and so on.
Reference Zone
Number:

Display Range

1 to 32

Network Access Read only

COOL MODE LOCK OUT — This variable displays whether
the system has been locked out of cooling mode. If this
decision is forced to

Yes

, the system may not go into cooling

mode regardless of how many zones are calling for cooling.
Cool Mode
Lock Out:

Display Range

Yes/No

Network Access Read/Write

AVERAGE COOL DEMAND — This variable displays the
average cooling demand of all occupied linked zones, taking
into consideration the size of each zone as configured in the
Terminal Service Configuration Table. This is so that the size
of a zone will be considered when comparing its demand to
other zones. If all zones are unoccupied then all zones will be
included in the calculation.
Average Cool
Demand:

Display Range

delta 0.00 to 99.9 F

Network Access Read Only

Table 17 — Master Zone Maintenance Table

DESCRIPTION

VALUE

UNITS

STATUS

FORCE

NAME

Desired System Mode

COOLING