Specifications

To check the DX coil temperature sensor:
1. Check that the DX coil temperature sensor wiring and
connections to the circuit board are physically intact. En-
sure the 5-conductor control wiring running between the
damper actuator and the monitor thermostat is not run near
AC, control, or communication bus wiring. Maintain a
minimum separation of 12 in. or more between other wir-
ing and remote room sensor wiring.
2. Check the DX coil temperature sensor calibration. Cali-
brate the sensor by manual calibration at the monitor ther-
mostat using the DX Coil Temperature Sensor Calibra-
tion function (category 5, option 7) and an accurate
thermometer. Measure the temperature at the DX coil tem-
perature sensor location using the accurate thermometer.
Wait for the reading to stabilize. Using the set point but-
tons, increase or decrease the temperature display to match
the reading of the thermometer.
OUTDOOR AIR TEMPERATURE SENSOR OUT OF
RANGE — An HF10 error is issued when the outdoor air
temperature sensor is reading below −40 F or greater than
150 F. The outdoor air temperature sensor can be recali-
brated. The HF10 error will automatically clear when the
sensor reading is back within the allowable range.
To check the outdoor air temperature sensor:
1. Check that the outdoor air temperature sensor wiring and
connections to the circuit board are physically intact. En-
sure the five conductor control wiring running between
the damper actuator and the monitor thermostat is not run
near AC, control, or communication bus wiring. Main-
tain a minimum separation of 12 in. or more between other
wiring and remote room sensor wiring.
2. Check the outdoor air temperature sensor calibration. Cali-
brate the sensor by manual calibration at the monitor ther-
mostat using the Outdoor Air Temperature Sensor Cali-
bration function (category 5, option 9) and an accurate
thermometer. Measure the temperature at the outdoor air
temperature sensor location using the accurate thermom-
eter. Wait for the reading to stabilize. Using the set point
buttons, increase or decrease the temperature display to
match the reading of the thermometer.
HUMIDITY SENSOR OUT OF RANGE — An HF11 error
is issued when the humidity sensor is reading below 0% or
greater than 100%. The humidity sensor can be recalibrated.
The HF11 error will automatically clear when the sensor read-
ing is back within the allowable range.
To check the humidity sensor:
1. Check if the humidity sensor wiring and connections to
the circuit board are physically intact. Ensure the 5-conductor
control wiring running between the damper actuator and
the monitor thermostat is not run near AC, control, or com-
munication bus wiring. Maintain a minimum separation
of 12 in. or more between other wiring and remote room
sensor wiring.
2. Check the humidity sensor calibration. Calibrate the sen-
sor by manual calibration at the monitor thermostat using
the Humidity Sensor Calibration function (category 5,
option 12) and an accurate psychrometer. Measure the hu-
midity at the humidity sensor location using the accurate
psychrometer. Wait for the reading to stabilize. Using the
set point buttons, increase or decrease the humidity dis-
play to match the reading of the psychrometer.
Monitor Reset — The monitor thermostat constantly veri-
fies operation and the information it utilizes. When it finds
a fault in a specified area, the monitor thermostat resets.
The monitor thermostat will reset when it finds fault in
the following areas:
• The inability of the microprocessor to properly operate the
programs used by the monitor thermostat causes an im-
proper response to zone and system conditions.
• The level of power used by the zone damper and by the
monitor thermostat (10 vdc) is out of range and will cause
improper operation by micro-electronic components dur-
ing low power conditions.
• The monitor thermostat cannot communicate with the zone
damper to prevent incorrect operation of the zone damper.
Each piece of information received by the monitor ther-
mostat is verified to eliminate the use of incorrect data. Each
portion of information stored by the monitor thermostat is
verified to eliminate the use of incorrect data. If incorrect
data is found, the monitor thermostat will reset and replace
the incorrect data with the default value.
When possible, system communication and data storage
faults are corrected by the monitor thermostat. When cor-
rections cannot be made the information is regarded as in-
valid and is not utilized.
NETWORK SET UP AND CONFIGURATION
As a part of the CCN system, on the network, the monitor
thermostat can send and receive broadcasts.
For the VVTt system to function correctly, the following
devices must be configured as described below:
• one monitor thermostat must have a timeclock and be a
network time broadcaster unless time is received from a
different network device (comfort controller). More than
one timeclock on a network is allowed
• there must be only one monitor thermostat configured as
a network time requester
• one and only one network device must be configured as
the broadcast acknowledger per bus
• all other devices should be configured to receive network
time as a time requester
See Fig. 32 for a typical network set up.
Network Time Broadcaster — When the Network
Time Broadcaster option is set to ON, the monitor thermo-
stat (if equipped with a timeclock) will periodically broad-
cast CCN time and date on the network.
When the Network Time Broadcast option is set to OFF,
the monitor thermostat will not broadcast time and date.
The Network Time Broadcaster can be placed anywhere
on the system (on the primary or secondary communication
bus).
To set the option, configure category 9, option 5. Use the
left set point buttons to toggle the option ON or OFF. The
default is OFF.
NOTE: The monitor thermostat must have its own time-
clock to broadcast network time, otherwise all network de-
vices will not function correctly.
38