Honeywell Excel 10 Manuale utente

74-3965

Excel 10

VAV II Balancing

Controllers

QUICK GUIDE

INTRODUCTION

The Honeywell Excel 10 VAV II Balancing Quick Guide

is intended to act as a on-the-job help for VAV Air

Balancers, Contractors, and Honeywell Technicians

balancing the Excel 10 VAV II family of controllers

using E-vision, LONSPEC™, or the hand-held tool. The

guide covers general troubleshooting tips, rules of

thumb, and step-by-step guides of these tools. The

guide is not intended to replace the Excel 10 VAV

software tools User Guides, but rather to act as a

supplement.

74-3965 2

TROUBLESHOOTING TIPS

Stable Airflow

When the VAV II controller is being balanced, the

configuration or balancing tool may indicate stable

airflow and allow balancing before the controller has

actually reached the balancing control setpoint. During

this period, if any measurements are made of the

actual airflow volume and entered while the controller

is still ramping to the airflow setpoint, erroneous

balancing results may be recorded.

IMPORTANT

• Excel 10 VAV II Controllers must have an air

flow pickup table downloaded to ensure

accurate balancing. Configuration tools do

not automatically install the flow pickup table

defined for the controller.

• If VAV II Controllers are not balancing, check

with the Honeywell Authorized technician or

Honeywell contractor that the flow pickup

table download to each controller has

occurred.

Testing Airflow Measurement

Anytime the controller’s airflow measurement process

is to be tested or troubleshooting is attempted, the

airflow must be constant. The VAV II controller should

be fixed at some desired or stable setpoint that is not

changed during troubleshooting or testing.

3 74-3965

Disconnecting Airflow Pickup Tubes

Anytime the airflow pickup tubes are disconnected

from the controller, the controller should be powered

down. There is no chance of damage to the controller,

but if the controller is exposed to unusually high static

pressure (< 5.0 in. w.c.) when one pickup tube is

connected there is a very slight possibility that the

controllers sensing process will stop operating. Should

this condition be suspected, simply cycle power to the

controller. It is not possible for this condition to occur

under normal operation with both airflow pickup tubes

connected to the controller.

Flow Pickup Pressure Physical

Measurement

Physical measurement of the flow pickup pressure for

the purpose of testing is best done with an instrument

capable of displaying pressure to 0.01 ±0.005 in. w.c.

Though electronic gauges and sensors often offer the

necessary accuracy, their sensitivity can cause

problems in field applications.

RULES OF THUMB

Balancing Airflow Setpoint Guidelines

All VAV II controllers must be balanced for both

minimum and maximum airflow for highest accuracy. If

the controller’s final configuration is to be a constant

volume unit, a minimum airflow balance is

recommended. The following guidelines are

recommended for flow volume setpoints.

74-3965 4

Table 1. Setpoint Guidelines.

If the guidelines outlined in Table 1 are enforced, then

most issues encountered with minimum airflow

balancing at the minimum setpoint are removed.

However, there are some symptoms that may require

minor adjustments.

Erratic or Unstable Airflow or

Zero / “Invalid” Display After Balancing

Unstable Airflow at Low Velocities

Check the damper drive parameters. If there is a rapid

cycling of the sensed airflow, when the balancing is

completed, unexpected and large air balance value

swings can occur. If this is noted, an adjustment of the

damper drive parameters may be required.

Airflow

Setpoint Rule

Maximum Maximum airflow setpoint cannot result in

a duct velocity greater than 3500 fpm

Maximum airflow setpoint must be greater

than the Minimum airflow setpoint

Minimum Minimum airflow setpoint cannot be set to

zero for balancing

Minimum airflow setpoint should be less

than or equal to 80% of the Maximum

airflow setpoint

5 74-3965

Minimum Airflow Setpoint too Close to

Maximum Airflow Setpoint

Decrease the value of the Minimum Airflow setpoint

and repeat the minimum airflow balance procedure.

Airflow Velocity Less Than 200 fpm

Check the velocity at the minimum airflow setpoint. If

the minimum airflow velocity is at or below 200 fpm, try

increasing the minimum airflow setpoint.

Airflow Sensor

If there are issues in the minimum airflow balancing,

one possible area to check is the operation of the

airflow sensor itself.

74-3965 6

BALANCING EXCEL 10 VAV II

WITH S7751A HAND-HELD TOOL

VERSION 2 (HHT2)

NOTE: Standard commissioning and Flow table

download steps must be completed before

starting this task. See S7751A Hand-Held

Tool II Product Data, Form 74-3031.

START

PLUG HHT2 INTO LONWORKS

NETWORK ACCESS LOCATION

TURN ON HHT2

SELECT HHT2 FUNCTION

SELECT "CHANGE AUTHORIZATION"

SELECT "BALANCE VAV2"

PRESS TOP MENU BUTTON

ENTER AAAA*

SELECT "EXCEL 10"

SELECT EXCEL 10 TO BE BALANCED THROUGH

ENTERING NODE #, NEURON ID, OR

IF A NON-NETWORKED CONTROLLER, USE STANDALONE ID

7 74-3965

STOP

SELECT "MAXIMUM"

CHECK

TROUBLESHOOTING

AND RULES OF THUMB;

MAKE CORRECTIONS

SELECT "PREVIOUS MENU"

ENTER MEASURED VALUE IN CFM AND PRESS ENTER

HAS

AIRFLOW

STABILIZED,

INDICATED BY

THE HHT2

BEEP?

YES

SELECT "MINIMUM"

CHECK

TROUBLESHOOTING

AND RULES OF THUMB;

MAKE CORRECTIONS

ENTER MEASURED VALUE IN CFM AND PRESS ENTER

HAS

AIRFLOW

STABILIZED,

INDICATED BY

THE HHT2

BEEP?

YES

PRESS ANY KEY THEN SELECT "BALANCE VAV2"

74-3965 8

BALANCING EXCEL 10 VAV II

WITH LONSPEC/VAV PLUG-IN

NOTE: The standard commissioning and flow table

download steps must be completed before

starting this task. See LONSPEC User Guide,

Form 74-2937.

LAUNCH

LONSPEC / VAV II PLUG-IN

HIGHLIGHT "HONEYWELL VAV2 CALIBRATE"

AND SELECT OK

SELECT FLOW CALIBRATION TAB ON THE

SENSOR CALIBRATION SCREEN FOR XL10 VAV2

START

9 74-3965

SELECT "MAXIMUM" UNDER THE ACTION WINDOW

CLICK THE "CALIBRATE" BUTTON

ENTER STABLE FLOW MEASURED VALUE

MAXIMUM AIR

BALANCE

CLICK THE "START" BUTTON

UNDER THE ACTION WINDOW

SELECT "MINIMUM"

STOP

HAS

MEASURED FLOW

BOX TURNED

WHITE?

YES

STABLE FLOW

IS NOT YET

REACHED

ENTER STABLE FLOW MEASURED VALUE

MINIMUM AIR

BALANCE

CLICK THE "START" BUTTON

HAS

MEASURED FLOW

BOX TURNED

WHITE?

YES

STABLE FLOW

IS NOT YET

REACHED

74-3965 10

BALANCING EXCEL 10 VAV II

WITH E-VISION

NOTE: The standard commissioning and Flow table

download steps must be completed before

starting this task. See E-Vision User Guide,

Form 74-2588.

DOUBLE CLICK

E-VISION

SELECT A VAV II CONTROLLER

FROM THE NETWORK DIAGRAM

FROM THE CALIBRATION DIALOG BOX

CLICK THE "MAXIMUM" BUTTON

CLICK MENU ITEM "CONTROLLER"

AND THEN CLICK "CALIBRATE"

MAXIMUM

AIR

BALANCE

ENTER MEASURED FLOW IN CFM

AND THEN CLICK CALIBRATE

STABLE

FLOW

REACHED

YES

START

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