Daikin Altherma ERHQ006-008AD Technical Data Manual page 224

3 Options
EBLQ011-016AA6W1
Bivalent system
Space heating with an auxiliary boiler (alternating operation)
Space heating application by either the altherma indoor unit or by an auxiliary boiler
connected in the system. An auxiliary contact decides whether either the E(D/B)(H/L)Q*
hydro module or the boiler will operate.This auxiliary contact can e.g. be an outdoor
temperature thermostat, an electricity tariff contact, a manually operated contact, etc.
3
Domestic hot water in such an application is always provided by the domestic hot water
tank which is connected to the hydro module, including when the boiler is in operation for
space heating.
3
The auxiliary boiler can be integrated in the pipework and in the field wiring according to
the illustrations below.
1 Compressor module
2 Hydro module
3 Heat exchanger
4 Pump
5 Shut-off valve
6 Collector (field supply)
7 Motorised 3-way valve (field supply)
8 Booster heater
9 Heat exchanger coil
10 Domestic hot water tank
11 Boiler (field supply)
12 Aquastat valve (field supply)
13 Shut-off valve (field supply)
14 Non-return valve (field supply)
FHL 1...3 Floor heating loop (field supply)
I User interface
224
• Monobloc • EBLQ011-016AA6W1
TM
• Altherma • Monobloc
Field wiring
Auto / Boiler
Boiler thermostat Boiler thermostat
C Auxiliary contact (normal closed)
th Heating only room thermostat
K1A Auxiliary relay for activation of E(D/B)(H/L)Q * unit
(field supply)
K2A Auxiliary relay for activation of boiler
(field supply)
Operation
When the room thermostat (th) closes, either the E(D/B)(H/L)Q * unit or the boiler starts operating,
depending on the position of the auxiliary contact ( C )
Make sure that auxiliary contact ( C ) has sufficient differential or time delay so
as to avoid frequent changeover between the E(D/B)(H/L)Q * unit and the
boiler. If the auxiliary contact ( C) is an outdoor temperature thermostat, make
sure to install the thermostat in the shade, so that it is not influenced or turned
ON/OFF by the sun.
Frequent switching may cause corrosion of the boiler in an early stage.Contact
the manufacturer of the boiler.
During heating operation of the E(D/B)(H/L)Q * unit, the Altherma unit will
operate so as to achieve the target leaving water temperature as set on the
user interface. When weather dependent operation is active, the water
temperature is determined automatically depending on the outdoor
temperature.
During heating operation of the boiler, the boiler will operate so as to achieve
the target leaving water temperature as set on the boiler controller.
Never set the target leaving water temperature setpoint on the boiler controller
above 55°C.
Make sure to only have 1 expansion vessel in the water circuit. An expansion
vessel is already premounted in the Altherma unit.
Make sure to configure the DIP switch SS2-3 on the PCB of the E(D/B)(H/L)Q *
switch box correctly. Refer to ' Room thermostat installation configuration' in
the installation manual supplied with the unit.
Make sure that return water to the E(D/B)(H/L)Q * heat exchanger never
exceeds 55°C.
For this reason, never put the target leaving water temperature setpoint on the
boiler controller above 55°C and it required, install an aquastat(*) valve in the
return water flow of the E(D/B)(H/L)Q* unit.
Daikin shall not be held liable fo any damage resulting from failure to observe
this rule.
(*)The aquastat valve must be set for 55°C and must operate to close the return water flow to the
E(D/B)(H/L)Q * unit when the measured temperature exceeds 55°C. When temperature drops to a lower
level, the aquastat valve must operate to open the return water flow to the E(D/B)(H/L)Q * unit again.
Boiler thermostat
1 2 3 4
3TW58019-5A