Setting Up An Auxiliary Heat Source For Space Heating - Daikin EBLQ05+07CAV3 Installer's Reference Manual

5 Application guidelines
5.3 Setting up an auxiliary heat source
for space heating
▪ Space heating can be done by:
▪ The outdoor unit
▪ An auxiliary boiler (field supply) connected to the system
▪ When the room thermostat requests heating, the outdoor unit or
the auxiliary boiler starts operating depending on the outdoor
temperature (status of the changeover to external heat source).
When the permission is given to the auxiliary boiler, the space
heating by the outdoor unit is turned OFF.
▪ Bivalent operation is only possible for space heating, NOT for
domestic hot water production. Domestic hot water is always
produced by the DHW tank connected to the outdoor unit.
INFORMATION
For bivalent operation to be possible, the system requires
control box EK2CB07CAV3.
INFORMATION
▪ During heating operation of the heat pump, the
heat pump operates
temperature set via 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 auxiliary boiler, the
auxiliary boiler operates to achieve the desired water
temperature set via the auxiliary boiler controller.
Setup
▪ Integrate the boiler as follows:
a b c
d
e
d
f h
g
a Outdoor unit
b Heat exchanger
c Pump
d Shut‑off valve
e Backup heater (option)
f Control box
g User interface
h Option box
i Motorised 3‑way valve (delivered with the domestic hot
water tank)
j Non‑return valve (field supply)
k Shut‑off valve (field supply)
l Collector (field supply)
m Auxiliary boiler (field supply)
n Aquastat valve (field supply)
o Domestic hot water tank (option)
p Heat exchanger coil
Installer reference guide
18
to achieve the desired
i j l
M
j
k
m
k
n
p
FHL1
FHL2
FHL3
o
FHL1...3 Under floor heating
NOTICE
▪ Make sure the auxiliary boiler and its integration in the
system complies with applicable legislation.
▪ Daikin is NOT responsible for incorrect or unsafe
situations in the auxiliary boiler system.
▪ Make sure the return water to the heat pump does NOT exceed
55°C. To do so:
▪ Set the desired water temperature via the auxiliary boiler
controller to maximum 55°C.
▪ Install an aquastat valve in the return water flow of the
heat pump.
▪ Set the aquastat valve to close above 55°C and to open below
55°C.
▪ Install non-return valves.
▪ Make sure to only have one expansion vessel in the water circuit.
An expansion vessel is already pre-mounted in the outdoor unit.
▪ Install control box EKCB07CAV3 and option box EK2CB07CAV3.
▪ Connect X8M/3 and X8M/4 (changeover to external heat source)
on option box EK2CB07CAV3 to the auxiliary boiler thermostat.
▪ To setup the heat emitters, see
cooling system" on page 12.
Configuration
Via the user interface (quick wizard):
▪ Set the use of a bivalent system as external heat source.
▪ Set the bivalent temperature and hysteresis.
NOTICE
▪ Make sure the bivalent hysteresis has enough
differential to prevent frequent changeover between
outdoor unit and auxiliary boiler.
▪ Because the outdoor temperature is measured by the
outdoor unit air thermistor, install the outdoor unit in the
shadow so that it is NOT influenced or turned ON/OFF
by direct sunlight.
▪ Frequent changeover may cause corrosion of the
auxiliary boiler. Contact the manufacturer of the
auxiliary boiler for more information.
Changeover to external heat source decided by an auxiliary
contact
▪ Only possible in external room thermostat control AND one
leaving water temperature zone (see
heating/cooling system" on page 12).
▪ The auxiliary contact can be:
▪ An outdoor temperature thermostat
▪ An electricity tariff contact
▪ A manually operated contact
▪ ...
▪ Setup: Connect the following field wiring:
L
Com
H
Outdoor/Auto/Boiler
A
K1A K2A
N
B Boiler thermostat input
TI
A Auxiliary contact (normal closed)
EBLQ05+07CAV3 + EDLQ05+07CAV3 + EKCB07CAV3 +
EK2CB07CAV3 + EKMBUHCA3V3 + EKMBUHCA9W1
Daikin Altherma low temperature monobloc
"5.2 Setting up the space heating/
"5.2 Setting up the space
Control box
B TI
X2M
1 4 X Y
K1A K2A
4P405544-1 – 2015.03