GB.FUNKRXHC.180907
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3. Function
3.1 General
RX/HC has a reversible heat pump function that is con-
trolled by the GOLD air handling unit’s control system
IQlogic via bus communication to the refrigerant circuit’s
control system iPro.
Operation and setting occurs via the GOLD air handling
unit’s hand-held micro terminal (see section 5. Settings).
The reversible heat pump circuit is controlled
with three signals:
• Stop/Start (0/1)
• Heating/Cooling (0/1)
• Speed level compressor in per cent (25-100%)
When operation is requested, a start signal is sent for the
production of heating or cooling.
Depending on the need in question, a signal is also sent
for the operating level, 25-100%. When operation is
not required, a stop signal is sent and 0 % signal for the
operating level.
3.2 Start of RX/HC air handling units
Start of the reversible heat pump occurs after the GOLD
air handling unit’s ordinary start sequence. Operation of
RX/HC is blocked during the GOLD air handling unit’s
ordinary start sequence.
3.3 Stop of RX/HC air handling unit
When stopping the GOLD air handling unit, operation of
the reversible heat pump is shut down immediately.
Post-cooling of the refrigerant circuit and electric air
heater for defrosting (if fitted) is carried out. After cooling
is in progress two minutes after the last operation of the
compressor or electric air heater.
3.4 Temperature regulation
The heat pump has its own control sequence (HC) in the
GOLD air handling unit’s temperature sequence. The
sequence regulates the temperature requirement 0-100%,
for the heating and cooling sequence respectively.
The heat pump is enabled when the temperature require-
ment exceeds 3% for 60 seconds and is disabled when
the temperature requirement drops below 1% for 60
seconds (applies for Operating mode - Standard).
Size 011 - 035 (one compressor)
The refrigerant circuit contains a speed controlled com-
pressor.
The compressor works between a MIN level (normal 25%)
and maximum speed.
At a temperature requirement below 25% the compressor
is run at 25% of max, at a need above 25% the compres-
sor follows the temperature requirement. (see the diagram
below)
3
25%
%
%
25%
100 %
100 %
%
1
Temperature require-
ment, GOLD
Operation level, HC
Temperature requirement
Compressor operation