Engineered Comfort Fan Coil Controller EZstat Especificaciones Pagina 10
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FAN COIL UNIT CONTROLS
Direct Digital Controls (con’t)
4. STANDARD CONTROL SEQUENCES – Engineered
Comfort’s most Popular Offerings
The EZstat can be factory or field configured for a number of
Engineered Comfort’s standard sequences. The sequence will
dictate whether the operation is 2 or 4 pipe and influence the
associated valve actuator’s performance and type, i.e. 0-10
VDC modulating and/or On/Off.
The EZstat may be used in digital applications using the EPIC
ECM along with monitoring the discharge air temperature
(DAT). The EPIC ECM is a variable speed DC motor that can
be adjusted to any speed required and capped at the
maximum CFM allowed by the unit it is installed in. A 0-10 VDC
signal is sent to the EPIC ECM which results in the control of
VAV operation. Alternatively, if a 3-speed ECM or PSC motor is
selected then the output would result in a constant air volume.
End users will benefit considerable energy savings in fan coil
units equipped with EPIC ECM, EZstat, and modulating water
valves or electric heat, when compared to units fitted with the
standard PSC motors. The reduction in energy consumption is
achieved by the ultra-high efficiency ECM and having the
EZstat modulate the motor speed to maintain the room
comfort level. The EZstat can be programmed up to a
maximum airflow for the cooling side and/or the maximum
airflow required for the heating side, as well as the minimum
CFM required for low energy consumption whilst the unit is in
deadband (more information on deadband can be found below).
More information on the EPIC ECM can be found herein under
the Fan Coil Unit Controls section of this catalog.
Exclusive Engineered Comfort control sequences can
accommodate all of the following Variable Air Volume (VAV)
applications:
• N501: Modulating Cooling/Modulating Heating with auto
Changeover
• N502: Modulating Cooling/Modulating Heating with Auxiliary
Staged Electric Heat
• N503: Modulating Cooling with Staged Electric Heat
• N505: Modulating Cooling/Modulating Heating
• N506: Modulating Cooling with Proportional Electric Heat
• N507: Modulating Cooling with On/Off Heat
• N508: Proportional Electric Heat or Modulating Heating
(sequence driven by fan coil selection)
• N509: Staged Electric Heat or On/Off Hot Water Heat
(sequence driven by fan coil selection)
• N510: Modulating Cooling
EPIC ECM VAV Control for 4-pipe & 2-pipe Operation:
EPIC Discharge Air Temperature (DAT) Control
An EPIC ECM sequences include a Dischrge Air Temperature
(DAT) sensor. The sensor monitors the coil discharge
temperature on both the cooling and heating cycle.
The adjustable cooling discharge temperature is factory set to
52°F (11°C) and provides the humidity control under part load
conditions.
On heating, the adjustable discharge temperature is factory
set to 90°F (32°C) to provide improved occupant comfort and
meet ASHRAE standard 62.1 requirements.
The DAT is monitored by the control and will modulate the
valve according to the demand versus DAT set point.
Nailor recommends modulating chilled water valves, utilizing
our industry exclusive sequence design; with the superior
benefits of maintaining a constant discharge temperature.
Auto Changeover
A thermistor Type III water temperature sensor (WTS)
provides auto changeover for 2-pipe cooling/heating
operation. The sensor is attached to the incoming hydronic
pipe and changes thermostat mode from cooling to heating
based upon the water supply temperature.
Cooling Operation
On a call for cooling, the chilled water valve will begin to
modulate open. As the cooling demand increases, the valve
will continue to open until the discharge air temperature
reaches 52°F (11°C). Simultaneously, the fan will modulate
from minimum airflow to maximum airflow to achieve room set
point. Upon a decrease in cooling demand, the sequence will
reverse.
Deadband Operation
With no demand in the space, there will be no call for heating
or cooling. The fan will be at a deadband set minimum airflow.
The water valve will be off and the electric heat relay will also
be off, if applicable.
Heating Operation
On a call for heating, the hot water valve will begin to modulate
open. The valve will continue to open until the discharge air
temperature reaches 90°F (32°C). Simultaneously, the fan will
modulate from minimum airflow to maximum airflow to achieve
room set point. Upon a decrease in heating demand, the
sequence will reverse.
Auxiliary 2-pipe Electric Heat (Seasonal)
On a call for heat with chilled water in the pipe, the water valve
closes and the electric heat turns on. The fan will step up to
the stage 1 fan heating setting and the first stage of electric
heat will be energized to achieve room set point. Units with
electric heat may have an optional second stage available. On
a continued call for heat, the fan will step up to the stage 2 fan
heating setting and the second stage of heat will be energized
to achieve room set point. On a decrease in heating demand,
the sequence will reverse. On a call for heat with hot water in
the pipe, the electric heat is locked out.
Comunication with other BACnet
network devices and remote monitoring
integrated
temperature sensing
Three inputs for external
sensors
Readily supports
Engineered Comfort
control sequences
Quick (temporary
network access
through
computer
data port
24 Volts
AC power
• Water
temperature
sensor
• Discharge air
temperature
• Remote
space
temperature
Fig. 2 Network setup
BMS
requires a convertor
FanCoilUnits-New_FanCoilUnits 9/29/14 9:06 AM Page D10
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