Damper Operation; Damper Operation; Fan Operation; Fan Operation - Nailor 37S Manual

Damper Operation
Damper movement is determined by comparing the actual airflow reading to the airflow set points. If the actual airflow is within
5% of the set point, no damper action is initiated. Once within the 5% deadband, the actual airflow must be outside a 7% deadband
before damper position changes.
Fan Operation
The EZvav controllers support both series and parallel fan powered VAV units. For either type of fan operation, the fan is controlled
through the following terminals.
• A binary output triac controls a 24-volt fan starting circuit. See the topic Configuring the VAV Terminal Unit options on
page 17 for the procedure to configure the controller for a fan.
• A 0-10 volt DC analog output controls the speed of the fan. The output controls fan speed at either Min Fan Speed or Max
Fan Speed. See the topic Set the airflow set points on page 19 for the procedure to set the fan speeds.
If the VAV unit is not configured for a fan, the two outputs are not used and remain inactive regardless of the occupancy state.
Series Fan
If the controller is configured for a series fan, any time the Occupancy mode of the controller is set to either Occupied or Standby,
the fan runs continuously. The fan speed is set to Maximum Fan Speed when the state is Occupied and set to Minimum Fan Speed
when the state is Standby.
When the Occupancy state is Unoccupied, the fan starts and runs at minimum speed only on a call for heating. The fan starts when
the Heating loop is greater than 5% and stops when the Heating loop is less than 1%.
Figure 8-2 Series fan operation
MAX FAN SPEED
MIN FAN SPEED
Parallel Fan
If the controller is configured for a parallel fan, any time the Occupancy mode of the controller is set to either Occupied or Standby
and there is a call for heat, the fan runs continuously. The fan starts when the Heating loop is greater than 5% and stops when the
Heating loop is less than 1%.
When the unit Occupancy state is Unoccupied, the fan starts and runs at minimum speed only on a call for heating. The fan starts
when the Heating loop is greater than 5% and stops when the Heating loop is less than 1%.
Figure 8-3 Parallel fan operation
MAX FAN SPEED
MIN FAN SPEED
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
UNOCCUPIED/
STANDBY
FAN OFF
OCCUPIED
UNOCCUPIED/
STANDBY
FAN OFF
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EZvav Digital Controls
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OCCUPIED
STANDBY
HTG SP ROOM TEMP INCREASE
HTG SP ROOM TEMP INCREASE
IOM-EZVAVINST