Honeywell WebVision, User Manual

Page: 35 / 176

WEBVISION™
35 95-7769—01
Fan fail When configured with an air flow detector, the
controller protects equipment by disabling the system when
the fan fails (for fan coil units with manual fan speed control).
Changeover The controller operates two-pipe units
configured with a changeover input.
Dewpoint When configured with a chilled water temperature
sensor, the controller will close the cool valve when the chilled
water temperature falls below the dew point. The dew point
may be a fixed value or calculated based upon input from a
humidity sensor.
Condensation When configured with a condensation switch,
the controller will close the cool valve when condensation is
detected.
Input/Output
Table 7 lists the Input/Output (I/O) detail.
CHC Outputs
Description
CHC applications can have a variable number of heating and
cooling stages. The number of pipes used on the unit could be
two or four. The outputs could be staged, PWM, floating, or
Thermal type. In addition the outputs can be of Change over
mode.
Purpose
Define the operation of the chilled ceiling controller outputs
and the type of equipment to be controlled.
Mode
Configuration can be performed with the wizard Off-line or
On-line.
Procedure
1. Click the Outputs button on the left pane to open the
Output Configuration page.
2. Enter information into available fields.
3. Click Commit to save the settings or Reset to revert to
the last saved settings.
4. Click Next to display the Input Configuration page.
CHC Output Fields
Table 8 describes the field definitions.
Table 7. Input/Output Detail.
I/O Function
PIN
Number Characteristics
INPUTS
Digital Window/
occupancy/
changeover/
air flow/
condensation
4 Closed ≤ 400 ohm
Open
≥
10K ohm
Digital
(See Table 5
on page 34)
Override 7 Closed ≤ 400 ohm
Open
≥
3.3k ohm
Analog Humidity
Sensor
1 0 to 10 Vdc
Analog Temperature
Sensor
3, 9 20K ohm NTC
(25 °C)
Analog
(Wall
Module
Connection
Only)
Setpoint
Adjustment
8 10k Ohm
OUTPUTS
Digital
(Wall
Module
Connection
Only)
Override
LED
6 0 to 5 Vdc (
≤
10mA)
Triac
(2 pairs)
Heat and
Cool
14, 15,
17, 18
24 Vac, 250 mA max
continuous,
650 mA max surge
(
≤
30 sec.)
Table 7. Input/Output Detail. (Continued)
I/O Function
PIN
Number Characteristics
Table 8. CHC Outputs - Field Definitions.
Name Definition
Application
Safety
Select/disable ceiling protection
Condensation Protection
Chilled Ceiling protection option
It enables dew-point calculation and condensation protection. The cold water temperature value must be
available (either wired connected or shared via the network). If the humidity value is available (either connected
or shared via the network), the controller uses it to calculate the dew-point temperature for the cold water
temperature limitation; otherwise it uses a settable dew-point setpoint.