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ENGLISH
When using non-copper metallic piping, be sure to insulate two kind of materials from each other to prevent galvanic corrosion.
For copper is a soft material, use appropriate tools for connecting the water circuit. Inappropriate tools will cause damage to the
pipes.
NOTE
The unit is only to be used in a closed water system. Application in an open water circuit can lead to excessive corrosion of the water piping:
Never use Zn-coated parts in the water circuit. Excessive corrosion of these parts may occur as copper piping is used in the unit's
internal water circuit.
When using a 3-way valve in the water circuit. Preferably choose a ball type 3-way valve to guarantee full separation between the
domestic hot water and floor heating water circuit.
When using a 3-way valve or a 2-way valve in the water circuit. The recommended maximum changeover time of the valve should
be less than 60 seconds.
9.4.4 Water circuit anti-freeze protection
All internal hydronic parts are insulated to reduce heat loss. Insulation must also be added to the field piping.
In event of a power failure, the above features would not protect the unit from freezing.
The software contains special functions using the heat pump and backup heater (if it is available) to protect the entire system against free
-
zing. When the temperature of the water flow in the system drops to a certain valve, the unit will heat the water, either using the heat pump,
the electric heating tap, or the backup heater. The freeze protection function will turn off only when the temperature increases to a certain
value.
Water may enter into the flow switch and cannot be drained out and may freeze when the temperature is low enough. The flow switch should
be removed and dried, then can be reinstalled in the unit.
NOTE
CounterclockWise rotation, remove the flow switch.
Drying the flow switch completely.
b
CAUTION
When the unit is not running for a long time, make sure the unit
is powered on all the time. If you want to cut off the power, the
water in the system pipe needs to be drained clean, avoid the unit and pipeline system be damaged by freezing. Also the power of
the unit needs to be cut off after water in the system is drained off.
b
WARNING
Ethylene Glycol and Propylene Glycol are TOXIC
9.5 Filling water
Connect
the water supply to the filling valve and open the valve.
Make sure the automatic air purge valve is open (at least 2 turns).
Summary of Contents for 20191845
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