Nailor 35SW - Damper Operation; Fan Operation

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IOM-EZVAVINST

Date: 10-2016 Supersedes: 7-2016

Nailor reserves the right to change any information concerning product or specification without notice or obligation.

Page 38 of 48

Installation and Operation Manual

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EZvav Digital Controls

DamperOperaon

Damper movement is determined by comparing the actual airow reading to the airow set points. If the actual airow is within

5% of the set point, no damper acon is iniated. Once within the 5% deadband, the actual airow must be outside a 7% deadband

before damper posion changes.

FanOperaon

The EZvav controllers support both series and parallel fan powered VAV units. For either type of fan operaon, the fan is controlled

through the following terminals.

• A binary output triac controls a 24-volt fan starng circuit. See the topic Conguring the VAV Terminal Unit opons on

page 17 for the procedure to congure 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 airow set points on page 19 for the procedure to set the fan speeds.

If the VAV unit is not congured for a fan, the two outputs are not used and remain inacve regardless of the occupancy state.

SeriesFan

If the controller is congured for a series fan, any me the Occupancy mode of the controller is set to either Occupied or Standby,

the fan runs connuously. 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 heang. The fan starts when

the Heang loop is greater than 5% and stops when the Heang loop is less than 1%.

Figure8-2 Seriesfanoperaon

ParallelFan

If the controller is congured for a parallel fan, any me the Occupancy mode of the controller is set to either Occupied or Standby

and there is a call for heat, the fan runs connuously. The fan starts when the Heang loop is greater than 5% and stops when the

Heang 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 heang. The fan starts

when the Heang loop is greater than 5% and stops when the Heang loop is less than 1%.

Figure8-3 Parallelfanoperaon

UNOCCUPIED/

STANDBY

MAX FAN SPEED

MIN FAN SPEED

FAN OFF

OCCUPIED

HTG SP ROOM TEMP INCREASE