ZONEMASTER MAXIPOINT V2 - Page 15

ZONEMASTER MAXIPOINT V2 DAMPER CONTROL SYSTEM - Installation Manual
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Spill Mode
This is a program designed to automatically open several allocated
dampers if someone attempts to shut all dampers down thus
preventing pressure build up. Spill mode uses the zones with lower
addressesinthesystem.Whenallocatingaddressestozonesinspill
mode, it is strongly recommended to give lower addresses to those
zones that have higher spill privileges. These zones are normally
located closer to the return air grilles. The lower the address, the
higher the spill privilege the zone has.
Another point to remember is DO NOT use bedrooms as spill zones.
During sleep time if the air conditioner is on and spill zones are
automatically forced to open, the spill zones will be very cold or hot.
This may cause discomfort if bedrooms are used as spill zones.
Whenthespillset-pointisreached,themaincontrolmoduleinstructs
zone1toopenasspill.Iftherstspillzonecannotsatisfythespillair
control, zone 2 will be forced to open to spill excess air. This process
willcontinueuntilthespillairset-pointissatisedinthesystem.
Example:Inan8zonesystem,ifsetpointissetat30%thenitwill
have at least 3 (calculated value = 2.4) or more zones remaining open,
hence rounding up the number of zones to open in the system.
Bypass Mode
In Bypass mode there is an extra damper and a length of duct that
goes directly from the supply air duct back to the return air duct. The
main control module instructs the bypass damper to open and dump
excess air to the return air duct. The bypass damper should be care-
fully sized to be able to handle excess air while all zones are closed.
Thebypassdampershouldbeconnectedtothe‘B’portonthemain
control module.