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8.3 Backup heater
A parameter defines if the Backup heater can be enabled or disabled, and the “Type of function”:
Heater in Replacement mode
Emergency mode
Heater in Supplementary mode
Note1: Terminal46 (Electric heater) digital output can be set by Par5146, for the DHW Electric heater output, or
for the Backup heater.
If the digital output is “DHW Electric heater” the digital output follows the logic explained “DHW heater
only”, “Heat pump + Heater” and “Legionella prevention function”.
If the digital output is “Backup heater” the digital output follows the logic explained “Backup heater”
Note2: If “Backup heater” is enabled as 1, 2 or3 by Par4600, the “DHW Over boost set point” will not be
available.
Digital Output “Electric heater”
Parameters
Level
Parameter
Function description
Display & Input value
Remarks
Group Code
Default
min.
Max.
Unit
I
46
00
B ackup heater type of function
0=disable
1=Replacement mode
2=Emergency mode
3=Supplementary mode
0
0
3
-
Par4600 and Par4700
are synchronized
Par4600=1, 2, 3
→ Par=4700=0
Par4700=1, 2
→Par4600=0
I
51
46
T erminal 46 : DHW Electric heater or Backup heater
0=DHW Electric heater
1=Backup heater
0
0
1
-
3way mixing valve
DHW tank
M
Space Heating
Backup heater
HP unit
The function of Backup heater is to heat DHW tank and Heating system in Replace or Supplementary mode by the
HP unit when the Heating capacity of HP unit is decreased by lower Outdoor air temperature and when the HP unit
is stopped due to the failure of sensors.
In addition, Backup heater will be turned ON for anti-freezing of water circuit at Start-up of HP unit or during defrost
operation.
If the heater is enabled, it must be installed before of the 3way valve as picture below.
8. Domestic Hot Water Production
Summary of Contents for AEYC-0639U-CH
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