Honeywell PRESTIGE THX9321 Manuel d'utilisateur télécharger pdf (Page 90)

THX9321 PRESTIGE

2.0 AND THX9421 PRESTIGE

IAQ WITH EIM

68-0311—02 90

Set Delta T Limits

1. Press Stage 1 to set the limits and run time (see Fig.

158). Use the saved test data located in the upper right

corner of the screen to set the Delta T Minimum and

Maximum Limits and the Run Time (see Fig. 159).

Fig. 158.

2. Press the up or down arrows to set the Minimum and

Maximum Limits and the Run Time.

Fig. 159.

3. Set appropriate Minimum and Maximum Delta T Limits

based on the reading from the equipment test and what

you consider to be unacceptable performance from the

heating and cooling equipment.

4. When setting the run time, select a setting based on

when Delta T began to stabilize during the equipment

test. In the example shown in Fig. 157 and 159, Delta T

began to stabilize around 10-11 minutes.

5. Set the limits and run time for all stages of cooling using

steps 1–4 above.

6. Repeat steps 1–5 above for Heating.

After Delta T Diagnostics Setup is Complete

The thermostat will measure Delta T after the specified run

time, and compare Delta T to the minimum and maximum limits

for each valid cycle. If the system operates below the minimum

limit or above the maximum limit multiple times (see Table 7),

an alert is recorded in the Alerts Log. If configured to do so, an

alert is displayed to the user (Display Delta T Alerts to User,

ISU 13190). The user is alerted by default. For example, if 10

of the last 15 cycles have the same fault, an alert is logged and

the user is alerted.

Advanced Options for Delta T Diagnostics

To set Advanced Options for Delta T Diagnostics, select Yes for

ISU 13015.Then the following advanced options are displayed:

• Delta T Alert Sensitivity (ISU 13180; Default: 3)

• Display Delta T Alerts to User (ISU 13190; Default: Yes)

• Allow Delta T Diagnostics:

— during humidification (ISU 13020; Default: Yes)

— during dehumidification (ISU 13030; Default: Yes*)

— during ventilation (ISU 13040; Default: Yes)

— only when indoor temperature is within a certain range

(ISUs 13050, 13090, 13130; Default: Always)

— only when indoor humidity is within a certain range

(ISUs 13060,13100, 13140; Default: Always)

— only when outdoor temperature is within a certain range

(ISUs 13070, 13110, 13150; Default: Always)

— only when outdoor humidity is within a certain range

(ISUs 13080, 13120, 13160; Default: Always)

* Default is Yes for Dehumidifiers and A/C with High Speed

Fan. The thermostat does NOT allow Delta T diagnostics dur-

ing dehumidification if it is setup for A/C with Low Speed Fan,

Hot Gas Bypass, or Reheat.

The Delta T Alert Sensitivity is set on a scale of 1–5 in ISU

13180 (1 is the least sensitive; 5 is the most sensitive):

By default, Delta T alerts are displayed to the user, but can be

turned off and on in ISU 13190.

Delta T Alerts

The thermostat uses alerts and diagnostics to provide greater

comfort and efficiency. Alerts and diagnostics can notify

customers when maintenance or service is needed, and

display your contact information to make it easy for them to

reach you.

This tells you if the system is performing above or below

expected standards which would normally go unnoticed, and

may cause unnecessary energy use. It can also detect and

warn about problems early, before heating or cooling

equipment fails.

There are three alerts each for the heating and cooling system.

They occur when:

• the system is not operating

NOTE: The thermostat displays an alert when the sys-

tem does not reach a Delta T of 5 F after the

thermostat calls for a reasonable period of time.

• the system is operating below the minimum Delta T limit

• the system is operating above the maximum Delta T limit

Delta T Alerts are displayed for basic failures including no

heating or no cooling that may be related to bad igniter, bad

flame sensor, bad gas valve, bad draft motor, bad blower, bad

contactor, bad startup capacitor, dead compressor, etc.

Table 7. Delta T Alert Sensitivity (ISU 13180).

Setting Alert is logged and user is alerted if

1 10 of the last 15 valid cycles have the same fault, or

25 of the last 30 valid cycles have the same fault.

2 10 of the last 15 valid cycles have the same fault, or

20 of the last 30 valid cycles have the same fault.

(Default)

5 of the last 5 valid cycles have the same fault, or

10 of the last 15 valid cycles have the same fault, or

15 of the last 30 valid cycles have the same fault.

4 5 of the last 5 valid cycles have the same fault, or

8 of the last 15 valid cycles have the same fault, or

15 of the last 30 valid cycles have the same fault.

5 3 of the last 5 valid cycles have the same fault, or

8 of the last 15 valid cycles have the same fault, or

10 of the last 30 valid cycles have the same fault.

1 2 ... 85 86 87 88 89 90 91 92 93 94 95 ... 159 160

Honeywell PRESTIGE THX9321 Manuel d'utilisateur Page 90

Commentaires sur ces manuels

Honeywell PRESTIGE THX9321 Manuel d'utilisateur Page 90

Commentaires sur ces manuels

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