Installation and Operation Manual
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Fan Coil Controller – EZstat
EC-EZstat
Date: 9-2014
Supersedes: NEW
Engineered Comfort reserves the right to change any information concerning product or specification without notice or obligation.
Page 11 of 36
Connecting to On/Off valves
The following diagram shows the connections for an on/off valve.
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The valves are actuated by 24 VAC
•
The outputs are 24 V relays.
Fig. 4-7 Connecting
on/off valve
COM
R
B05
4.4 Connecting Power
The EZstat requires an external, 24 VAC power source. Use the following guidelines when choosing and wiring
transformers.
•
Use only a Class‑2 transformer of the appropriate size to supply power.
•
Connect the transformer’s neutral lead to the COM terminal.
•
Connect the AC phase lead to the 24VAC terminal.
•
Power is applied to the controller when the transformer is powered.
Fig. 4-8 Wiring for EZstat power
COM
24VAC
4.5 Maintenance
Remove dust as necessary from the holes in the top and bottom. Clean the display with soft, damp cloth and mild soap.
