Dantherm Calorex AA300AVH, Owners & Installation Manual, Page: 8 / 36

1.1 OPERATION
The AA300/AA500 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/AA%00 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/AA500 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 AA300/AA500s 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 controller has three switching channels, one
of which is for setting the OCCUPIED/ UNOCCUPIED air temperature. (See
section 1.2)
When fitted, the Water temperature controller has two switching channels,
OUT1 (the Set Point) which is set from the front panel, and OUT2 which is
factory preset.
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%
= 60% diff 3%
Air temperature = 28ºC diff 0.5 ºC
Water temperature = .26ºC diff 0.2 ºC
Please note: on AA machines with LPHW, in occupied mode dehumidification
stops once the air temperature is 2.5ºC above set point.
6 SD611250 ISSUE 8
AA300AVH/AA500AVH TECHNICAL MANUAL