Overview Of The Unit; Opening The Unit; Main Components - Daikin Altherma EDHQ011AA6V3 Installationsanleitung

Pump operation
With no thermostat connected to the unit (1), the pump (3) can be
configured to operate either as long as the unit is on, or until the
required water temperature is reached.
NOTE Details on pump configuration can be found under
"Pump operation configuration" on page 19.
Space heating and cooling
According to the season, the customer will select cooling or heating
through the user interface.
The unit (1) will operate in cooling mode or heating mode to achieve
the target leaving water temperature.
With the unit in heating mode, the 2-way valve (11) is open. Hot water
is provided to both the fan coil units and the floor heating loops.
With the unit in cooling mode, the motorised 2-way valve (11) is
closed to prevent cold water running through the floor heating loops
(FHL).
When closing several loops in the system by remotely
controlled valves, it might be required to install a by-pass
valve (7) to avoid the flow switch safety device from being
activated. See also "Application 2" on page 6.
Wiring of the 2-way valve (11) is different for a NC (normal
closed) valve and a NO (normal open) valve! Make sure to
connect to the correct terminal numbers as detailed on the
wiring diagram.
The ON/OFF setting of the heating/cooling operation is done by the
user interface.
O
VERVIEW OF THE UNIT

Opening the unit

2 2
1
3
Door 1 gives acces to the compressor compartment and electrical parts
Door 2 gives acces to the electrical parts of the hydraulic compartment
Door 3 gives acces to the hydraulic compartment
Switch off all power supply — i.e. unit power supply and
backup heater and domestic hot water tank power supply
(if applicable) — before removing doors 1 and 2.
Parts inside the unit can be hot.
E(D/B)(H/L)Q011~016AA6V3+W1
Unit for air to water heat pump system
4PW51121-1A

Main components

Hydraulic compartment (door 3)
1
19
16
18
17
13
15
8
10
3
9
8
14
12
3
11
6
1. Air purge valve
Remaining air in the water circuit will be automatically removed
via the air purge valve.
2. Backup heater
The backup heater consists of an electrical heating element that
will provide additional heating capacity to the water circuit if the
heating capacity of the unit is insufficient due to low outdoor
temperatures, it also protects the external water piping from
freezing during cold periodes.
3. Temperature sensors
Four temperature sensors determine the water and refrigerant
temperature at various points in the water circuit.
4. Heat exchanger
5. Expansion vessel (10 l)
6. Refrigerant liquid connection
7. Refrigerant gas connection
8. Shut-off valves
The shut-off valves on the water inlet connection and water
outlet connection allow isolation of the unit water circuit side
from the residential water circuit side. This facilitates draining
and filter replacement of the unit.
9. Water inlet connection
10. Water outlet connection
11. Drain and fill valve
12. Water filter
The water filter removes dirt from the water to prevent damage
to the pump or blockage of the evaporator. The water filter must
be cleaned on a regular base. See "Maintenance" on page 28.
2
2
3
5
4
7
3
Installation manual
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