Swegon RX/HC User Manual
Guide to the GOLD version F functions,
Reversible heat pump, RX/HC
GB.FUNKRXHC.180907
1. General
RX/HC is a complete reversible heat pump, fully integrated
in the GOLD air handling unit.
There are three options to defrost the coils
in the exhaust air:
Option 1. Reversing the media circuit.
Option 2. Reversing the media circuit +
electric air heater
Option 3. Reversing the media circuit +
air recirculation section RX/HC
1.1 Installation
See the separate installation and maintenance instructions
to install RX/HC.
See the separate installation instructions to install the air
recirculation section RX/HC, if used.
2. Material specification
Air handling unit with integrated
reversible heat pump GOLD RX/HC
For defrosting according to option 2 (see section 1):
Electric air heater for defrosting. Installed in GOLD RX/HC
from the factory.
For defrosting according to option 3 (see section 1):
Air recirculation section RX/HC for defrosting.
We reserve the right to alter specifications.
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3. Function
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25%%%
25%
100 %
100 %
%1
3.1 General
RX/HC has a reversible heat pump function that is controlled 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.
GB.FUNKRXHC.180907
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 requirement 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 compressor.
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 compressor follows the temperature requirement. (see the diagram
below)
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.
Compressor operation
Temperature requirement, GOLD
Operation level, HC
Temperature requirement
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We reserve the right to alter specifications.
Size 040 - 080 (two compressors)
0
20
100 % 908070605040302010
0
40
60
80
100%
100
100
0
20
100 % 908070605040302010
0
40
60
80
100%
0
20
100 % 908070605040302010
0
40
60
80
100%
100
The refrigerant circuit contains a speed controlled compressor and a compressor of the on/off type.
The speed controlled compressor works between a MIN
level (total 12.5% per compressor, corresponding to 25%
of the speed controlled compressor) and maximum speed.
Increasing temperature requirement
At a temperature requirement below 12.5% the speed
controlled compressor is run at 25% of max, speed.
GB.FUNKRXHC.180907
Compressor speed controlled
When the temperature requirement increases above
12.5%, the speed controlled compressor is regulated to
follow the temperature requirement.
At a temperature requirement above 50%, the speed
controlled compressor runs to max, speed.
When the temperature requirement increases above
62.5%, the on/off compressor and the speed controlled
compressor are regulated to follow the temperature requirement.
%
80
60
40
20
Compressor operation
0
0
100 % 908070605040302010
Temperature requirement
At a temperature requirement of 100%, both compressors
run at max, speed.
Decreasing temperature requirement
When the temperature requirement decreases below
100%, the on/off compressor is operational and the speed
controlled compressor is regulated to follow the temperature requirement.
At a temperature requirement below 62.5% the speed
controlled compressor is run at 25% of max, speed and
the on/off compressor is operational.
When the temperature requirement decreases below
50%, the on/off compressor shuts down and the speed
Compressor, on/off
%
80
60
40
20
Compressor operation
0
0
100 % 908070605040302010
Temperature requirement
controlled compressor is regulated to follow the temperature requirement.
At a temperature requirement below 12.5% the speed
controlled compressor runs at 25% of max, speed.
Total output
The diagram shows the total capacity in per cent, which is
the same as the control signal from the control system.
We reserve the right to alter specifications.
Total output
%
80
60
60
40
Total output
20
0
0
Temp. requirement, GOLD
Operation level, HC
100 % 908070605040302010
Temperature requirement
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