8
Pressure
T1 T2
T3
Transducer
Valve
Electric
Liquid Line
Evaporator
Defrost Temp. Sensor
Evap Coil In/
Distributor
Room Temp Sensor
Temp Sensor
Evap out / Fan Delay
Suction Line
ADVANCED MASTER CONTROLLER
Expansion
Figure 2.
Factory-Mounted Parts
• A controller board, an electric expansion valve, a pressure transducer, and three temperature sensors
for single evaporator system (standalone or alternating) or peer (multiple evaporator system)
evaporator are pre-mounted at the factory. . For a multiple evaporator system, only 1 evaporator is
required to have an air temperatue sensor. For reverse cycle defrost, a 24 VAC 40VA transformer is
mounted at standalone or master evaporator to provide power 24VAC to the four-way reversing valve
mounted in the condensing unit. The control circuit and power supply are pre-wired to the terminal
board of the evaporator. The board is molded in epoxy to avoid excessive moisture in cold room.
• A 4-way reversing valve, operating at 24 VAC, is installed in a reverse cycle defrost equipped unit. A
transformer is also installed in one of the evaporators to supply 24VAC to the 4-way reversing valve.
• Peer to Peer controls can be connected directly to each other, using a CAT-5E cable, if there are only
2 controllers. The controllers must be connected through an Ethernet switch or router if 3 or more
controllers are on the system. The controllers must be bonded together. A technician should install the
CAT-5E cable from the controllers to the Ethernet switch or router and bond the controllers. All
components are factory tested. A technician should check all the wiring and settings for proper
operation after installation.
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