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FACTORY DEFAULTS
The control comes preset with several factory defaults. These defaults are based on the terminal unit (heat emitter) selection
(see section B2). To fine-tune building requirements, these defaults may be changed. If a factory default value for a terminal
unit (heat emitter) is changed, the terminal unit (heat emitter) number will flash when selected in the ADJUST menu.
To reload the factory defaults listed in section B2, power down the control and wait for 10 seconds. Power up the control while
simultaneously holding the
Item
and buttons. The terminal unit (heat emitter) number should now be displayed constantly in
the LCD rather than flashing.
MIXING DEMAND
A mixing demand is required in order for the GEO 360 to provide heat. A mixing demand
is generated by applying a voltage between 24 and 230 V (ac) across the
Mixing
Demand
terminals (1 and 2). Once voltage is applied, the
Mixing Demand
pointer is
displayed in the LCD. If the GEO 360 is not in Warm Weather Shut Down (WWSD), the
GEO 360 closes the
Sys Pmp
contact. The GEO 360 calculates a MIX TARGET supply
temperature based on the outdoor air temperature and settings. If required, the GEO
360 operates the boiler in order to provide heat to the mixing valve.
SYSTEM PUMP OPERATION
(SYS PMP)
The system pump contact (Sys Pmp, terminal 5) closes whenever there is a mixing demand and the GEO 360 is not in Warm
Weather Shut Down (WWSD). The system pump segment is displayed in the LCD. After the mixing demand has been satisfied,
the GEO 360 continues to operate the system pump for 20 seconds. This allows some residual heat to be purged out to the
heating system. During WWSD, the system pump is operated based on the exercise function.
INDOOR SENSOR
An indoor sensor may be used in order to provide indoor temperature feedback. The indoor sensor is connected to the
Com
and
Indr
terminals (16 and 18). In addition, power must be applied to the
Mixing Demand
terminals (1 and 2) as described in
the MIXING DEMAND section. With the indoor sensor connected, the GEO 360 is able to sense the actual room temperature.
Indoor temperature feedback fine-tunes the supply water temperature in the mixing system to maintain room temperature. To
adjust the room temperature, use the ROOM OCC or ROOM UNOCC setting in the ADJUST menu at the control.
If a multiple zone system is used with an indoor sensor, proper placement of the indoor sensor is essential. The indoor sensor
should be located in an area which best represents the average air temperature of the zones.
CHARACTERISED HEATING CURVE
When used as a mixing reset control, the GEO 360 varies the supply water temperature based on the outdoor air temperature.
The control takes into account the type of terminal unit (heat emitter) that the system is using. Since different types of terminal
units (heat emitters) transfer heat to a space using different proportions of radiation, convection and conduction, the supply
water temperature must be controlled differently. Once the control is told what type of terminal unit (heat emitter) is used, the
control varies the supply water temperature according to the type of terminal unit (heat emitter). This improves the control of
the air temperature in the building.
MIXING TARGET TEMPERATURE (MIX TARGET)
When used as a mixing reset control, the MIX TARGET temperature is calculated from the
Characterised Heating Curve
settings, outdoor air temperature and optionally, indoor air temperature. When used as a setpoint control, the installer sets
the MIX TARGET temperature. The control displays the temperature that it is currently trying to maintain as the mixing supply
temperature. If the control does not have a mixing demand,”– – –” is displayed as the MIX TARGET.
Section B: Mixing
Section B1: General
1 2
Mix
Demand
24 to 230 V (ac)
Section B1
General
Section B2
Installer
Section B3
Advanced
