Phase Monitor
5IFVOJUDPOUSPMDJSDVJUSZJODMVEFTBQIBTFNPOJUPSUIBU
DPOTUBOUMZDIFDLTGPSQIBTF
SFWFSTBMQIBTFJNCBMBODFMPTT
PGQIBTFPSBQPXFSCSPXOPVU
*USFRVJSFT7"$UPPQFSBUF
and when it detects a fault, it
DVUTPGGUIF7"$UIBUHPFTUP
the low voltage terminal strip,
UIFSFCZTIVUUJOHPGGBMMNPUPST
Typical Phase Monitor
Component Operation
Supply Fan VFD Sequence
Optional Room CO2 Sensor:
5IF%%$DPOUSPMMFSXJMM
NPEVMBUFUIFTVQQMZGBOCBTFEPOBDPNQBSJTPOPGUIF
$0TFUQPJOUUPUIFBDUVBM$0MFWFMTSFQPSUFEGSPN
UIFTFOTPS.FDIBOJDBMIJHITUBUJDQSPUFDUJPODVUPGGT
NVTUCFJOTUBMMFECZPUIFSTUPQSPUFDUUIFTZTUFNBOE
FRVJQNFOUGSPNPWFSQSFTTVSJ[BUJPO
Optional Duct Static Pressure Sensor:
5IF%%$
DPOUSPMMFSXJMMNPEVMBUFUIFTVQQMZGBOCBTFEPOB
comparison of the duct static pressure set point to
the actual duct static pressure level reported from
UIFTFOTPS.FDIBOJDBMIJHITUBUJDQSPUFDUJPODVUPGGT
NVTUCFJOTUBMMFECZPUIFSTUPQSPUFDUUIFTZTUFNBOE
FRVJQNFOUGSPNPWFSQSFTTVSJ[BUJPO5IFNBOVGBDUVSFS
EPFTOPUBTTVNFSFTQPOTJCJMJUZGPSUIJT
Optional Building Static Pressure Sensor:
5IFTVQQMZ
GBOJTNPEVMBUFECBTFEVQPOUIFTJHOBMGSPNBCVJMEJOH
TUBUJDQSFTTVSFTFOTPS5IF%%$DPOUSPMMFSXJMMNPEVMBUF
UIFTVQQMZGBOCBTFEPOBDPNQBSJTPOPGUIFCVJMEJOH
TUBUJDQSFTTVSFTFUQPJOUUPUIFBDUVBMCVJMEJOHTUBUJD
pressure level reported from the sensor.
Optional Exhaust Fan VFD Sequence
Optional Building Static Pressure Sensor:
The
FYIBVTUGBOJTNPEVMBUFECBTFEVQPOUIFTJHOBMGSPNB
CVJMEJOHTUBUJDQSFTTVSFTFOTPS5IF%%$DPOUSPMMFSXJMM
NPEVMBUFUIFFYIBVTUGBOCBTFEVQPOBDPNQBSJTPO
PGUIFCVJMEJOHTUBUJDQSFTTVSFMFWFMSFQPSUFEGSPNUIF
sensor.
Optional Outdoor Air Damper Tracking:
5IF%%$
DPOUSPMMFSXJMMQSPQPSUJPOBMMZNPEVMBUFUIFFYIBVTUGBO
CBTFEVQPOUIFPVUEPPSBJSEBNQFSQPTJUJPO
Variable Frequency Drive (VFD)
*GB7'%XBTQSPWJEFEBOEJOTUBMMFEBUUIFGBDUPSZJUIBT
CFFOQSFTFUUPDPOUSPMUIFTQFFEPGUIFCMPXFSNPUPS
for optimum performance. The motor speed needs to
CFWFSJmFEEVSJOHUFTUBOE
CBMBODFPGUIFVOJU
*GUIFTZTUFNXBTDPOmHVSFE
GPS$POTUBOU"JS7PMVNF $"7
the VFD will operate in an ON
/ OFF fashion and the speed
PGUIFNPUPSXJMMOPUDIBOHF*G
UIFTZTUFNXBTDPOmHVSFEGPS
7BSJBCMF"JS7PMVNF 7"7UIF
%%$XJMMDPOTUBOUMZNPOJUPS
operating conditions and
provide a signal to the VFD,
changing the VFD output as needed.
5IF7'%NBZBMUFSOBUJWFMZCFDPOOFDUFEUPBOFYUFSOBM
TJHOBMTVDIBTQSPWJEFECZB#.4BOECFPQFSBUFECZB
7%$PSBN"JOQVU
Typical Variable
Frequency Drive (VFD)
12
Packaged Rooftop Ventilator
®
