Key Lock; Remote Sensor Location; Pipe Sensor (2-Pipe Fcu Only); Pipe Sensor Temperature - Johnson Controls FCP-NA-701-L User Manual

Key lock

You can lock the thermostat with the key lock function. Users cannot adjust settings when the key
lock is active. To activate key lock, complete the following step:
• Press and hold the Mode, Up, and Down buttons for 10 seconds to lock the thermostat.
Follow the same step to deactivate the key lock.

Remote sensor location

If the thermostat detects a remote temperature sensor you can set the remote sensor location
to in room or in duct. If the remote sensor location is in room the fan turns off when you do not
switch on the fan and the temperature control algorithm does not call for fan. If the remote sensor
location is in duct, the lowest available fan speed is low. This means that the fan runs on low speed
even when you do not switch on the fan and the temperature control algorithm does not call for
fan.

Pipe sensor (2-pipe FCU only)

The pipe sensor is available for 2-pipe FCU systems only. The pipe state can either be hot or cold
and can be set by the pipe sensor temperature, pipe state calendar, or manually.

Pipe sensor temperature

When a pipe sensor is installed, a comparison of the pipe sensor temperature with the heat to cool
threshold and cool to heat threshold temperatures determines the pipe state. If the pipe sensor
temperature is higher than the cool to heat threshold then the pipe state is hot. If the sensor
temperature is lower than the heat to cool threshold then the pipe state is cold. You can configure
the heat to cool threshold and cool to heat threshold in the system configuration settings menu.
The pipe sensor temperature is measured every 5 minutes when either one of the following
conditions is met:
• The Y terminal is turned on for 5 minutes during normal call for heating or cooling

• Purge sequence

Purge sequence
During a purge sequence, the thermostat turns on the Y terminal for 6 minutes, but does not turn
on the G terminal. The purge sequence is available only if the system type is 2-pipe FCU and when
the pipe sensor is installed, and runs under the following conditions:
• On the first power-up
• After you enter and exit the advanced settings menu
• In a regular timing interval
When the purge sequence runs, an hourglass icon shows on the thermostat display for 6 minutes
until the purge sequence is complete. During the purge sequence, you cannot change the
thermostat operation such as change the control mode and set temperature. However, you can
enter the advanced settings menu.
You can configure the purge frequency in the system configuration settings menu.

Calendar based switching (FCP-PA only)

Calendar based switching is available only on the FCP-PA model and if a pipe sensor is not installed.
With calendar based switching you can set a date on which the pipe state switches from hot to cold
14 FCP Non-Programmable and Programmable Fan Coil or PTAC Thermostat Largo User Guide