Installation and Operation Manual
●
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 30 of 36
Table 8-1
EZstat Input objects
Modulating fans
The fan starts a modulation fan on a call for either heating or cooling. The fan runs at the minimum dead band speed until
the heating or cooling loop is above 50%, then the fan start to ramping up based on room temperature demand From 50%
to 100% of the loop, the fan speed ramps to maximum speed. The minimum and maximum fan speeds are set from the
user interface during system setup.
Automatic fan control
A user with Password 1 can set the EZstat controlled fan to either run continuously or to start automatically on a call for
cooling or heating.
Auto
—when Auto is selected, the fan runs at deadband, and when there is a call for cooling or heating, the fan will begin
to modulate toward the maximum cooling or heating fan airflow. Fan will continue to run unless system mode is changed
to Off mode on the user interface.
Low, Medium, High
—for systems with three‑speed fans, the user has the choice of low, medium or high speed as the
continuous running speed for the fan.
If the user selects one of these speeds on the user interface, this will override the auto functionality and Nailor
sequences. However, if the user accidentally overrides AUTO function, the AUTO FAN RESET (for ECM applications
only) can prevent this from occurring, by Enabling the AUTO FAN RESET located in SYSTEM menu. The AUTO FAN
RESET feature works together with LOCAL OVRD Time. To adjust default time of 60 mins, select LOCAL OVRD TIME.
The control will reset back to Auto Mode, while ensuring the efficiency benefits of EON (variable speed) motor.
8 SYSTEM INTEGRATION
Topics in this section cover integrating EZstat controllers into a building automation network. These are advanced topics for
control technicians and engineers.
The EZstat can function as a standalone controller or it can be connected to a BACnet MS/TP network. The topics in this section
are reference material for control technicians or engineers that will be installing and setting up an EZstat that is connected to
a network.
In addition to the information in this section, you will also need the following information.
•
Detailed plans and drawings for the building automation system.
•
Information about the facility LAN including routers, switches, and network firewalls.
•
Application Note AN0404A,
Planning BACnet Networks
.
8.1 BACnet objects
The EZstat is a BACnet Application Specific Controller (ASC) that is composed of standard BACnet objects. This section
lists the objects that are likely to be needed for monitoring with a standard BACnet operator workstation to verify system
operation.
Changing the configuration of any object may result in unpredictable operation of the EZstat and damage to
equipment that is under control of the EZstat.
Not all input objects are present in every model.
Input objects
The following BACnet input objects represent values at the physical inputs of the EZstat. Only inputs 1‑3 are available for
external connections.
Input
Name
Description
Device Type Screen Display
AI1
REMOTE_SENSOR
Remote Room Sensor
KMC10K_Type_II
AI2
WATER_TEMP
Water Temperature
KMC10K_Type_III
AI3
DAT
Discharge Air Temp
KMC10K_Type_III
AI4
LOCAL_SENSOR
Space Temp
KMC10K_Type_II
NOTE
NOTE
