CaptiveAire RTULink, Installation, Operation And Maintenance Manual

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Modbus Address - Modbus addressing begins at 60, so unit number 1 will be assigned 60. Modbus 61 will be
assigned to unit number 2. Modbus 62 will be assigned to unit number 3, etc. It is important to number the units
in accordance with the mechanical plans.
Control Mode - When scrolling through the menu, the board will adjust between the following settings, Full
Control, External Control, Monitor Only, and Emergency Heat. Control mode definitions are explained in detail in
RTULink MODES OF OPERATION on page 24 .
Tempering Sensor -
If “Space” is selected, the space thermistor will be used as the tempering sensor. If “Return”
is selected, the return air thermistor will be used as the tempering sensor.
# Heat Stages - Sets the number of heating stages that are equipped on the RTU.
# Cool Stages - Sets the number of cooling stages that are equipped on the RTU.
Heat Pump Enable - Setting to enable or disable heat pump.
HP O/B Mode - For heat pump units, this will set the reversing valve to activate for heating or cooling.
Heat Pump Lock - If the heat pump temperature is below the temperature setting, the heat pump will be locked
out.
Mode Change Time - Mode change time is only applicable to heat pumps. This is the time required to elapse to
change state (from heating to cooling or cooling to heating). For example, a heat pump must be off after heating
for the duration of this timer to reverse the condenser valve and change to cooling. If the condenser valve is
switched rapidly it will damage the condenser, so this timer is intended to increase the condenser's life.
# of HMIs - Sets the number of HMIs connected to the system.
Screen Saver - Setting to enable screen saver option.
Lock Screen - Displays information on the Space HMI when the screen is inactive.
HMI ‘x’ Avg Enable
- Sets if averaging is ON or OFF.
Heating SP - The heating set point is the default set point that the RTULink defaults to if it ever comes out of a
schedule from CASLink or has never received a schedule from CASLink (during startup). If the tempering sensor
is below this set point plus the Heat Hysteresis value, the RTULink will send a signal for heating.
Cooling SP - The cooling set point is the default set point that the RTULink defaults to if it ever comes out of a
schedule from CASLink or has never received a schedule from CASLink (during startup). If the tempering sensor
is above this set point plus the Cool Hysteresis value, the RTULink will send a signal for cooling.
Blower Mode - Blower mode is the blower's default status that the RTULink defaults to if it ever comes out of a
schedule from CASLink or has never received a schedule from CASLink (during startup).
Airflow Required
– Setting to turn on/off proving for airflow.
Blower Delays - Setting to enable or disable blower delays.
Blower On Delay - Time setting for Blower On Delay.
Blower Off Delay - Time setting for Blower Off Delay.
Enable Max HP - Setting to enable or disable maximum heat pump runtime.
Max HP Runtime - Time setting for heat pump runtime before auxiliary heat activates
Emer. Heat Lock - Setting to enable or disable emergency heat.
Lockout Temp - If the outside air temperature is below the temperature setting, emergency heat will be locked
out.
Min Blower Time - Minimum blower time is the minimum amount of time the blower is required to be ON before
turning OFF, and the minimum time it is required to be OFF before turning ON. This setting is intended to reduce
the blower from cycling, and improve the lifespan of the motor and belts if applicable.
Emer Heat Config - Emergency heat configuration determines if an emergency heat feature is present on the
RTU and what is used to control it.