Carrier Gen 2 Vvt Manual

VELOCITY PRESSURE PROBE GAIN Ð The pressure
pickup which sends the pressure data can distort data due to
placement, vibration, or other factors. The Velocity Pressure
Probe Gain option allows a multiplier to be added to the value
being read by the pressure pickup. The default is 1.0 (mul-
tiplying by 1 results in an identical value). The range of
values is 0.5 to 5.0. To con®gure the Velocity Pressure Probe
Gain option, set category 5, option 6. Enter the gain for the
pickup probe speci®ed per the...

IAQ ALARM DELAY Ð The IAQ Alarm Delay option con-
trols how long the zone controller will wait before issuing
an IAQ alarm. To con®gure the IAQ Alarm Delay option,
set category 14, option 4. The number of minutes will be
shown. The range of acceptable values is 0 to 240 minutes
in 1-minute increments. Use the left set point buttons to set
the time limit to the desired value. The default value is
0 minutes.
DAMPER CONTROL
The zone controller modulates a zone damper to maintain
the zone temperature...

the left set point buttons to raise or lower the Minimum Damper
Position setting. The range of values is 0 to 7, where 0 is
fully closed and 7 is half open. The default is 5.
MINIMUM AIRFLOW SET POINT Ð The Minimum Air-
¯ow Set Point establishes the minimum supply air¯ow that
can be delivered to the zone controller zone during pressure
independent damper modulation. The air¯ow set point is shown
in cubic feet per minute.
To con®gure the Minimum Air¯ow Set Point option, set
category 3, option 7. The...

When zone demand is 1.5É F or greater, the zone con-
troller modulates the zone damper open, until air¯ow through
the damper equals the Air¯ow Set Point or until the Damper
Maximum Open Position is reached. When zone demand is
less than 1.5É F, the zone controller modulates the zone damper
to maintain a percentage of the Air¯ow Set Point propor-
tional to zone demand.
To con®gure the zone controller for pressure independent
damper modulation, set the Zone Pressure Independent
Operation option to ON. The...

Supplemental Heat Interface ÐThe zone supple-
mental heat source is interfaced to the zone controller through
a Heating Relay Pack. With the relay pack the zone con-
troller can control a fan and two stages of supplemental heat.
See Fig. 12.
For side pocket fan powered mixing boxes (parallel fan
box), the zone controller can control three stages of heat. At
1.5É F demand, the zone controller energizes the fan relay.
At 2.0É F demand the zone controller energizes the H1 heat
relay. At 2.5É F demand the...

As an example, if the Maximum Damper Position is set to
13 and the Minimum Damper Position is set to 5. Subtract
5 from 13 to get 8. Divide 8 by 10 to get 0.8. Supplemental
Heat Damper Factor 0 is 5 (Minimum Damper Position).
Use this formula is determine the Supplemental Heat Damp-
er Factors: Minimum Position + (((Maximum Position þ
Minimum Position)/10) * supplement heat damper posi-
tion). Factor 01 is 5 + (0.8 * 1) = 5 (all values are truncated).
Factor 02 is 5 + (0.8 * 2) = 6. Factor 10 will be 13...

DIAGNOSTICS
The zone controller has diagnostic capabilities for com-
ponents, information, zone comfort, and usage.
Diagnostic problems, called errors or alarms, are divided
into 3 categories: Hardware Failure (HF) errors, Storage Fail-
ure (SF) errors, and System Errors (SE). The zone controller
tracks the operating conditions in the zone.
Error Code Display ÐAn error code representing the
SE, SF, and HF diagnostic functions can be displayed to in-
dicate which error has been declared. The 2 letters...

METER FULL ERROR (SE02,03,04) Ð System Errors SE02,
SE03, and SE04 indicate when a zone meter is full.
NOTE: During a meter full error, the full usage meter stops
recording and retains its maximum value until cleared.
To clear an SE02, SE03, or SE04 error, reset the full meter
to zero by using network access software. The meter can be
reset by forcing the value to zero through Carrier Network
Access Software.
IAQ EXCEEDED LIMIT ERROR (SE10) Ð When the CO
2level exceeds the preset level, the sensor...

Hardware Failure (HF) Errors ÐA Hardware Fail-
ure (HF) error is an error that corresponds to a hardware
failure at the zone controller, associated sensors, or zone damper.
To clear an HF Error, the component responsible for ini-
tiating the HF Error must be adjusted, repaired, or replaced.
See Table 5 for a description of HF errors.
Table 5 Ð Hardware Failure (HF) Errors
ERROR HARDWARE PROBLEMS PRIORITY LEVEL
HF01 Cannot Detect Closed Damper 2
HF02 Cannot Detect Open Damper 2
HF03 Zone Temperature...

To check the zone temperature sensor:
1. Check that the zone temperature sensor is physically in-
tact on the zone controller printed circuit board. Ensure
the sensor is not shorted against the zone controller printed
circuit board.
2. a. Ensure the Room Sensor option (category 5, option 1)
has been con®gured correctly.
b. Check for other wiring running parallel to and less than
12 in. from the remote room sensor wiring. Avoid
running AC, control, or communication bus near the
remote room sensor wiring....