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© JBG-HT (v.2.0)
INSTRUCTION MANUAL
– HEAT PUMP
4.7. Defrost mode
When the pump is operating at temperatures below about 5°C at the set load, frost (icing) may appear on the
exchanger. This is because, a large amount of water vapor present in the environment (the so-called humidity)
during forced air flow through the exchanger is gradually deposited on the frozen lamella block. The melting of
frost is accomplished by the same “compressor” system, or more precisely by changing the direction of refriger-
ant circulation. The energy required for this is taken from the heating system. The defrosting mode is carried out
automatically at strictly defined periods and only when the heating mode is used.
Necessary conditions to start the defrosting process:
1 ) Evaporation temperature is below the value determined by the controller algorithm.
2 ) Ambient temperature is below 7°C.
3 ) Defrost interval exceeds the set value (default 45 minutes).
In JBG
HT
brand heat pumps, the outer surfaces of the evaporator are covered with a hydrophilic coating, which
shows excellent water protection properties in high temperatures and salty environments. The solution used
consolidates water molecules, which in larger amounts under their own weight flow faster into the drip tray, the
end result being the reduced defrosting time.
4.8. Electrical installation
4.8.1.
Requirements
The device is designed to be powered from the electricity grid:
1 ) Power supply cables and power circuit protection should be selected to meet the condition of auto-
matic power outage.
a)
3-phase unit: ~400 [V]/50 [Hz] 3L+N+PE
2 ) Power cables should be appropriately selected due to the length of the power lines and the charac-
teristics of their routing:
a)
3-phase min. 5 x 2,5 mm
2
•
Protection, overcurrent circuit breakers for the unit:
a)
ZHHS-01-10K-R290-V5: 16A characteristics C, 3-phase, 3L+N
b)
ZHHS-01-15K-R290-V5: 25A characteristics C, 3-phase, 3L+N
3 ) it is required to use residual current protection in accordance with applicable standards
4 ) In a 3-phase pump, connect the electric heater to the least loaded circuit.
5 ) The device is supplied with electrical voltage hazardous to life.
6 ) All work related to the repair and service of the device must be performed by personnel with the
appropriate authorizations.
7 ) Before starting the device, check the device for damage, especially cables and electrical apparatuses.
8 ) The detection of any damage to the equipment will result in the prohibition of its commissioning and
operation.
9 ) When making an electrical connection, the technical conditions for connection to the power grid shall
be observed.
10 ) The electrical connection ratings must match those on the equipment nameplate.
11 ) The electrical cables and protection used, as well as the execution of the electrical connection, must
meet the requirements of standards and local regulations.
Summary of Contents for ZHHS-01-10K-R290-V5-M
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