Chapter 7 Sequence of operations for the 1 heat/1 cool configuration
52 CNT-SVX06B-EN
If the entering water temperature value remains out of range to accom-
plish the desired heat/cool function, the controller closes the main
hydronic valve and waits 60 minutes to attempt another sampling. If the
entering water temperature value falls within the required range, it
resumes normal heating/cooling operation and disables the sampling
function.
Fan operation and status
The Tracer ZN511, configured for 1 heat/1 cool operation, supports three
fan speeds. Every time the fan is enabled, the fan will begin operation
and run for 3 seconds in high speed before changing to any other speed.
This is done to provide adequate torque to start the fan motor from the off
position. The controller can be set to Auto, a specific fan speed, or Off. If
both a communicated and hardwired value is present, the communicated
value has priority.
When the controller receives a communicated Auto signal or the associ-
ated fan speed switch is set to AUTO, the fan will operate in the Auto
mode. In the Auto mode, the fan will operate as configured in Rover. The
fan can be configured for continuous or cycling operation and for a default
fan speed for both heating and cooling mode operation. When configured
for continuous operation, the fan operates continuously at the default fan
speed during occupied, occupied standby and occupied bypass operation.
When configured for cycling operation, the fan will cycle between off and
the default fan speed during occupied, occupied standby, and occupied
bypass operation. During unoccupied operation, the fan will cycle
between off and high regardless of the fan configuration.
When the controller receives a communicated fan speed signal (high,
medium, low) or the associated fan speed switch is set to a specific fan
speed, the fan will run continuously at the desired fan speed during occu-
pied, occupied standby, and occupied bypass operation. During unoccu-
pied operation, the fan will cycle between off and high regardless of the
fan configuration.
The fan will turn off when the controller receives a communicated off sig-
nal, when the fan speed switch is set to OFF, or when the default fan
speed is set to off and the fan is operating in the auto mode.
The ability to enable or disable the controller’s associated fan speed
switch is also configurable.
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