Data Sheet for Product

Technical Instructions Polygyr-Compact Exhaust Air Temperature Controller
Document Number CM1N3405E-P25
Rev. 1, February, 2000
Page 4
Siemens Building Technologies, Inc.
Application
When the unit is switched off or the power supply interrupted (Terminal G), the
regulating unit is automatically run to the closed or no-load position.
A transformer is required to generate the operating voltage of 24 Vac. When several
units are connected, the size of the transformer is determined by adding up the power
consumption of the individual units. See
Wiring Diagrams
for connecting terminal
designations.
The RCM61.21 can control up to 10 units (actuators, converters, etc.) in parallel
operation. If a compensation input is used, attention must be paid to the input signal.
Terminal Z1: Input for universal compensation. The signal + 5V ± 10V
corresponds to ± 100% of the theoretical setting range.
Terminal Z3: Input for set point adjustment (fixed value shift) from a building
automation system. The signal + 5V ± 5V corresponds to ± 10% of
the theoretical setting range.
Mounting
Mounting location: In the exhaust air duct as close as possible to the room, or in the
main air duct if there are several air outlets; always in front of the exhaust air fan. The
flexible sensing element should be positioned diagonally in the duct, but must not come
in contact with the duct wall.
Installation Instructions are supplied with the unit.
Commissioning
The correct operation of the regulating unit can be checked by setting the slider to its
limit positions. The factory-set P band Xp normally gives good control results. If
readjustment is required, the following must be noted:
•
In case of instability: Xp must be increased.
•
In case of excess stability: Xp must be decreased.
If auxiliary control functions (e.g., limitation, compensation) are fed to the controller, the
controlled value must first be adjusted, with no influence from the auxiliary control
functions. To do this, the terminals for auxiliary units must be disconnected. The
auxiliary values are adjusted only after the controlled value is adjusted.
If a remote setting unit is used, the slider for setting the desired temperature must be set
to “ext”.