HIdRos LZT 05, Техническое руководство

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LZT
High efficiency air to water heat pumps
MTLZTGB REV.012008
19
OPERATION LIMITS
Outlet water te
m
perature (°C)
0
10
20
30
40
50
60
70
-20 -10 0 10 20 30 40 50
Ambient temperature (°C)
User heat exchanger water flow rate
The nominal water flow rate given by HIDROS is referred to a Dt of 5 °C. Maximum flow rate allowed is the one that presents a Dt of
3 °C: higher values may cause too high pressure drop. The minimum water flow rate allowed is the one presenting a Dt of 8 °C.
Insufficient values cause too low evaporating temperatures with the action of safety devices which would stop the unit.
User hot water temperature (winter operation)
Once the system is on temperature, user hot water temperature at the user heat exchanger inlet does not have to be less than 30
°C: lower values could cause incorrect working operation of the compressor and compressor failure may occur. The maximum user
water temperature can not exceed 60°C (sizes 09T,13,20,25,30,40) or 55°C (sizes05,07,09); higher values may call the action of
safety devices with unit stop.
Cold water temperature (summer operation)
The minimum temperature allowed at the evaporator outlet is 5 °C. To work below this limit, the unit should need some structural
modifications. In this case contact our company. The maximum temperature allowed at the evaporator outlet is 15°C.
Ambient air temperature
The units are designed and manufactured to operate, In winter operation (heating mode ) from -15°C to 25°C. In cooling mode the
units can operate with ambient air temperatures from 20 to 43°C.
WARNING: All units are supplied standard with evaporation / condensing pressure control. This device
allows unit operation in heating mode over 15°C and in cooling mode under 20°C ambient temperature.
The device modulates the airflow measured by a pressure transducer obtaining, in this way, correct
operating parameters. This device can be used as well to reduce unit sound level emission in cooling
mode when ambient temperature is decreasing (i.e. during night time).Fan speed control is factory pre-
set. The values must never be modified.
Cooling
Heating all sizes
Heating:
mod. 09T, 13, 20, 25,
30, 40 only