Issue
Operation of multiple Satchwell CZU Fan Coil Unit Controllers from a common Temperature Sensor.
Product Line
Field Devices
Environment
Fan Coil Unit installations comprising multiple Satchwell CZU Fan Coil Unit Controllers.
Stand alone discreet Satchwell CZU Mk 1, Mk2, Mk3 and Mk4 Zonemaster Controllers
CZU1201 CZU1202 CZU1203
CZU2201 CZU2202 CZU2203
CZU3201 CZU3202 CZU3203
CZU4201
Cause
From time to time the need arises for office partition layouts within a building to be revised in order to reflect changes in occupancy requirements.
This can result in the combination of numerous individual controlled spaces into a common controlled space.
This in turn may result in the need to revise associated Fan Coil Unit control systems installed in the controlled spaces affected.
Such revisions may require multiple Fan Coil Unit control systems to be controlled from a common Temperature Sensor installed in the common controlled space.
This form of control may be achieved by adopting the installation method described in the Resolution.
Should the common controlled space be of such a size as to benefit from the installation of averaging Temperature Sensors then this may be achieved by installing 4 non-adjustable Temperature Sensors.
The 4 non-adjustable Temperature Sensors should be wired in a series-parallel configuration in order to ensure compatibility with the associated Satchwell CZU Fan Coil Unit Controller.
The series-parallel wiring configuration may be achieved by adopting the installation method described in the Resolution.
Resolution
1. Operation of multiple Satchwell CZU Fan Coil Unit Controllers from a common Temperature Sensor.
Multiple Satchwell CZU Fan Coil Unit Controllers should not be connected directly to a common Temperature Sensor.
Instead the common Temperature Sensor should be connected to a single Satchwell CZU Fan Coil Unit Controller.
The single Satchwell CZU Fan Coil Unit Controller should then be connected to the associated Fan Coil Unit Heating Coil Control Valve Actuators and / or Cooling Coil Control Valve Actuators.
Up to 7 Heating and / or 7 Cooling Control Valve Actuators may be wired to a single Satchwell CZU Fan Coil Unit Controller in accordance with the method shown here
2. Averaging Temperature Sensor control.
Should the controlled space be of such a size as to benefit from the installation of averaging Temperature Sensors then 4 non-adjustable Temperature Sensors may be wired in series-parallel configuration in order to ensure connection compatibility with the associated Satchwell CZU Fan Coil Unit Controller.
The 4 non-adjustable Temperature Sensors may be wired in series-parallel configuration to a common Satchwell CZU Fan Coil Unit Controller in accordance with the method shown here
