Section 8: Sequences Of Operation; Input Sources - Nailor 37S Manual

Section 8: Sequence of Operation
Topics in this section cover the sequences of operation for the EZvav controllers. These are advanced topics for control technicians
and engineers.
These sequences of operation are descriptions of each major component of the EZvav programming. They are provided as an aid
to understanding how the controllers operate.
This section covers the following sequences of operation.
Input sources ....................................................................................................................................34
Occupancy sequence ........................................................................................................................35
Space set points ................................................................................................................................35
PID control loops ..............................................................................................................................36
Airflow set points sequence .............................................................................................................36
Changeover .......................................................................................................................................36
Discharge Air Temperature (DAT) limiting .........................................................................................37
System diagnostics ............................................................................................................................37
Damper operation ............................................................................................................................38
Fan operation ....................................................................................................................................38
Reheat sequence ..............................................................................................................................39
Balancing airflow sequence ..............................................................................................................40
Dual duct ..........................................................................................................................................40

Input sources

The EZvav controllers require specific sensors to measure room temperature, airflow, and discharge air temperature. All sensors
are automatically detected and the programming is automatically set up for the sensors.
• EZvav digital wall sensors.
• STE-6014W36 thermistor temperature sensor.
• Discharge air temperature sensor.
• Diamond Flow sensor.
EZvav digital wall sensors - The EZvav digital wall sensors include a room temperature sensor, a digital display, and a push button
interface for entering set points and configuring the controllers. If a EZvav digital wall sensor is detected, the sensor's temperature
is mapped to the Space Temperature Reference value object as the temperature input value. See the topic BACnet objects on
page 44 for additional information on value objects.
The model STE-8201W36 EZvav digital wall sensor also includes a motion sensor to detect when the zone is temporary occupied.
This is described in the topic Occupancy sequence on page 35.
STE-6014W36 thermistor temperature sensor - STE-6014W36 sensor is compatible with the EZvav controllers. If the sensor is
detected, the sensor temperature is mapped to the Space Temperature Reference value object as the temperature input value.
See the topic BACnet objects on page 44 for additional information on value objects.
Discharge air temperature sensor - The DAT sensor is an optional Type-III, 10 kΩ thermistor and is required for VAV heating
applications. If the controller detects that this sensor is connected, then the controller will use discharge air temperature to
determine when to change between heating and cooling. The DAT sensor input is used also to control reheat. See the topics
Discharge Air Temperature (DAT) limiting on page 37 and Changeover on page 36.
Diamond Flow sensor - A multi-point airflow sensor that is designed to provide an averaged and accurate signal for use with
pressure independent controls. Pick-ups are located in all four quadrants of the inlet. Through amplification of the velocity pressure
signal (∆P), the controller is capable of lower minimums by increasing sensitivity at lower airflows. The high and low pressure
measurements along with the K-factor of the VAV terminal unit are used to calculate the airflow through the VAV unit.
Date: 10-2016 Supersedes: 7-2016
Nailor reserves the right to change any information concerning product or specification without notice or obligation.
Installation and Operation Manual
Page 34 of 48
EZvav Digital Controls
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EZVAVINST