Master Zone Maintenance Table i Tile Master Zone
Maintenance Table (MZNMAINT) displays variables used by
the Linkage Coordinator zone controller when detennining the
system mode (heat/cool/vent). It also indicates whether a by-
pass controller and an air source ale being used and which zone
is the reference zone. Tile 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: Dispkiy Range COOLING, HEATING.
FREECOOL, PRES-
SURE, EVAC, OFF
Network Access Read only
SYSTEM MODE- This vmiable will display file cunent
system mode of the air source, if Linkage is available, or the
mode determined by the Linkage Coordinator using the prima-
ry air sensol: if available. If file primary air sensor has failed or
was not installed, the Linkage Coordinator will assume the
default mode of cooling.
System Mode: Dispkiy Range COOLING, HEATING.
FREECOOL, PRES-
SURE, EVAC, OFF
Network Access Read only
AIR SOURCE DETECTED -- This vmiable displays whether
the Linkage Coordinator zone controller has detected a
communicating air source at the ad&ess configured in the
Linkage Configuration Table.
Air Source
Detected: Display Range Yes/No
NetwoNAccess Readonly
BYPASS CONTROLLER -- This vmiable displays whether
the Linkage Coordinator zone controller has detected a com-
municating bypass controller as configured in file Linkage
Configuration Table.
Bypass
Controller: Display Range Yes/No
NetwoNAccess Readonly
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 rekited to configured Unoccupied
Heating and Cooling set points.
The reference zone is re-determined on every scan of the
zone controllel_ 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 me the greatest at
any time and that requires the same mode as the system.
For exmnple, if the Desired System Mode is cooling, the
Reference Zone # is that mode that has the greatest cooling
need.
The zones me 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 ad&ess 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 l_,s, the system may not go into cooling
mode regardless of how many zones are c_dling for cooling.
Cool Mode
Ix_ck Out: Display Range Yes/No
Network Access Read/Write
AVERAGE COOL DEMAND -- This vmiable displays the
average cooling demand of all occupied linked zones, taking
into consideration tile 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 _dl zones are unoccupied then all zones will be
included in the calcukition.
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 NEXTMODE
System Mode COOLING LINKMODE
Air Source Detected? Yes AIRSOURC
Bypass Controller? No BYPASS
Reference Zone Demand 0.0 ^F REF_DMD
Reference Zone # 0 REF_ZON E
Cool Mode Lock Out? No C_LOCK
Average Cool Demand 0.0 ^F AVGC_DMD
Max Cool Demand 0.0 ^F MAXC_DMD
Max Cool Demand Zone 0 MAXCZONE
Cooling Time Guard 0.0 min C_TGUARD
Time Guard Override No TG_OVRD
Heat Mode Lock Out? No H_LOCK
Average Heat Demand 0.0 ^F AVGH_DMD
Max Heat Demand 0.0 ^F MAXH_DMD
Max Heat Demand Zone 1 MAXHZONE
Heating Time Guard 0.0 min H_TGUARD
Mode Reselect Time 0.0 min RESELECT
Outdoor Air Temperature 0.0 dF OAT
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