Operation - Calorex aa300 Technical Manual

1.1 OPERATION

The AA300 is connected to the control panel and then to the isolated mains supply as described in section
2.3. The isolator is then energised. The MAINS light on the side of the heat pump will illuminate indicating mains
ON. If the AA300 is fitted with an LPHW the time clock will start to run. The time clock has a battery reserve fitted
which when charged will run for 100 hours so that isolating the machine for short periods will not affect the time
clock settings.
The AA300 unit is switched on to normal operation by an ON (I)/OFF (O) switch on the console.
When switched on the red indicator light will illuminate and digital controller(s) will light up.
Providing that the controls are set to the correct parameters; nominally 60% RH, (28ºC air temperature), the
machine will operate automatically.
For AA300s with LPHW fitted, the 'unoccupied' temperature is set on the digital air controller and will be
switched in/out by the time set on the time clock.
As the unit operates, the indicator lights will show the state of the control conditions, ie dehumidification,
heat to air.
See section 3.0 for control panel symbols.
PARAMETER CONTROLLERS
Each parameter, Relative Humidity (and Air Temperature) is sensed within the machine and the signal is taken to
the relevant digital controller.
The RH controller has two switching channels, OUT1 (the Set Point) which is set from the front panel, and OUT2
which is factory preset.
When fitted, the Air Temperature has three switching channels, one of which is for setting the OCCUPIED/
UNOCCUPIED air temperature. (See section 1.2)
Each channel has a switching differential which is also factory pre-set. None of the factory settings should be
tampered with.
When the re-settable channel is adjusted all other settings and differentials automatically follow at the correct
relationship.
Nominal set point values & diffs RH%
Please note: on AA machines with LPHW, in occupied mode dehumidification stops once the Air temperature is
2.5ºC above set point.
Air temperature
Page 5
= 60% diff 3%
= 28ºC diff 0.5 ºC