Operating instructions

Operating advanced function _43
ENGLISH
Backup Heater Variables for Space Heating
• TheFSV#4021shouldbesetto“0(Off)”(Default)touse2-stageelectricbackupheaterin
hydro unit as an additional heat source.
• To compensate the lowered heat pump heating performance under very cold weather
conditions,theFSV#4023shouldbesetto“1(On)”(Default).
 -Thethresholdtemperaturetousebackupheaterforcoldweathercompensation:
FSV#4024,Default“0˚C”,Range-15~35˚C
 - The backup heater operation is restricted to save energy in the threshold temperature
range.
• TheFSV#4022forbackupheaterpriorityshouldbesetto“0(both)”(Default)or“1”(backup)
to use backup heater. If not(booster heater priority), the backup heater can be operated in
case of no booster heater demand.
•The threshold temperature for backup heater operation during defrost mode to prevent cold
draft because of chilled water can be controlled by adjusting FSV #4025. Under FSV #4025
of water outlet temperature, backup heater Will be turned on.
To use both heaters together at the same time, please check the capacity of the power
circuit breaker of your house before use.
External Backup Boiler for Space Heating (Field Option)
• TheFSV#4031shouldbesetto“1(Yes)”touseabackupboilerasanadditionalheat
source.(default:“0(Noinstallation)”)
• PriorityofbackupboilerandheatpumpisdefinedbyFSV#4032(default:“0(OFF)”)
• To compensate the lowered heat pump heating performance under very cold weather
conditions, the backup boiler operates instead of heat pump under the threshold
temperature(FSV#4033,Default“-15˚C”,Range-20~5˚C).