Water Connections; Refrigerant Connections; Pump Speed Selection - Carrier 80AWX-065 series Installation, Operation And Maintenance Instructions

5.4 - Water Connections

Refer to the Safety Information Manual.
• No need to use a counter spanner when tightening
hydronic connections to the module.
• Use only water mixed with any water treatment
product to avoid bacteria and dirt proliferation in the
circuit.
• Place valves (not included) at the inlet and outlet of the
hydronic module.
• Use pipe of 1" or bigger for connections between the
hydronic module and terminal.
• Wrap the connections with the anti-condensate
insulation and tighten with tape, without exerting
excessive pressure on the insulation.
• Start the water filling when all the installation
connections are complete.
Maximum distance between 3-way valve and hydronic
module: 3 m.
Maximum distance between domestic hot water tank and
hydronic module: 10 m

5.5 - Refrigerant Connections

Refer to the Safety Information Manual.
For piping lengths, refer to the Outdoor unit manual.

5.6 - Pump Speed Selection

The pump provided with the module is a variable speed
circulator. The installer selects the speed of the module
pump to guarantee the target flow rate (± 20 %) in the
space heating/cooling loop, knowing the available pressure
of the system at different pump speed (see fig. 13, 14 and
15) and the pressure drop of the installation.
Make sure that the pressure drop in the domestic hot
water loop is not too low. If needed, install a valve to
modulate the pressure drop; in this loop, inlet/outlet
temperature difference should be 8-10 °C.
28
Hydronic 80AW - 150
Module
CDU 38AW 38AW
050 065
Nominal 5.0 6.5
Capacity
[kW]
Nominal 5 5
DT [° C]
Nominal 860 1118
Flow Rate
[lt/h]
The operating red knob allows to set several pressure
levels in 2 control modes :
• Variable differential pressure (Δp-v)
• Constant differential pressure (Δp-c)
Variable differential pressure (Δp-v)
Constant differential pressure (Δp-c)
Venting function
Min flow=1 ; Max flow=8
"Set Up" procedure :
Factory pre-setting = Δp-c 8
All functions can be set, activated or deactivated by using
the operating red knob :
• the control mode Δp-v is set on the left of the middle
position (from 1 to 8).
• the control mode Δp-c is set on the right of the middle
position (from 1 to 8).
• for venting the pump, turn the knob in its middle
position (the venting function is activated after 3 seconds
and lasts 10 minutes before going to
Δp-c max mode).
Note :
* The variable pressure mode (Δp-v) is recommended in
heating systems with radiators.
* The constant pressure mode (Δp-c) is recommended for
underfloor-heating circuits.
* All hydronic curves have been defined in constant
pressure mode for min, medium and max speed.
80AW - 115 80AW - 150
38AW 38AW 38AW 38AW
090 115 120 150
9.0 11.5 12.0 15.0
5 5 5 5
1548 1978 2064 2580