Heiko Thermal 12, Руководство пользователя

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4) Terminal block 4
Application Side
A B C D
COM ES COM CS COM HS COM TH
3. Installation
D: Electrical Utility Lock Input
Some electricity companies offer a special rate if the house power consumption is lowered to a certain
value during peak time. If the unit is supposed to stop working during this period, one can connect the
signal from electricity company to this “External Shutdown” port and use the parameter setting to
activate this function.
E , F: Cool mode & heat mode switch-over
This unit can switch over between heating and cooling functions automatically, according to ambient
temperature, or external signal input.
For ambient temperature switching, please refer to part 1.06 of introduction of user’s interface for detailed
setting.
For external signal input, external signal should be connected to “COOL MODEL SWITCH” for cooling
operation, and “HEAT MODE SWITCH” for heating operation.
G: High demanding distribution system switch
When two heating distribution systems are connected, unit should always take the set temperature
for high demanding circuit, which needs higher temperature in heating and lower temperature in
cooling operation, as the set temperature for the heat pump unit.
However, when this high demanding circuit is not needed or has reached the set temperature, heat
pump unit can switch the heat pump set temperature to the values set for the other circuit, for better
efficiency.
This set of connector is used to receive the signal from high demanding circuit, if has.
When "CLOSE" signal is received, unit works with high demanding.
When "OPEN" signal is received, unit works with low demanding.
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