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Technical Instructions Polygyr-Compact Immersion Temperature Controller
Document Number CM1N3409E-P25
Rev. 1, February, 2000
Page 4
Siemens Building Technologies, Inc.
Compensation
If a compensation input is used, attention must be paid to its 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). The signal + 5V ± 5V
corresponds to ± 10% of the theoretical setting range.
Mounting
Mounting location:
With heat exchanger control, mount as closely as possible to the heat exchanger,
allowing for the permissible ambient temperature.
A threaded fitting is required to mount the controller in the pipe work. Where possible,
the fitting should be welded in a pipe bend so that the immersion detector stem faces
the flow of water. The controller must be mounted at the side of the pipe if the warm air
rising from the pipe work could cause the temperature of the unit to exceed 122°F
(50°C).
Installation Instructions are supplied with the unit.
Commissioning
To check the operation, P control can be provided by using the service plug.
The correct operation of the regulating unit can be checked by setting the slider to its
limit positions. With domestic hot water temperature control (mixing), the selected
integral action time must be 10 s (plug position PI 1). If the factory settings must be
changed, the following must be noted:
•
In case of instability (controlled system oscillates): Xp must be increased.
•
In case of instability although Xp is set to maximum value: integral action time must
be increased.
•
In case of excess stability (controlled system too slow): Xp must be decreased.
The ration of the proportional bands Xp1 to Xp2 should roughly correspond to the ratio
of the correcting spans of valves Y1 and Y2.
If auxiliary control functions (e.g., limitation, compensation) are fed to the main
controller, the controlled value must first be adjusted, with no influence from the
auxiliary control functions. 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”.