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O
PERATION LIMITS
User heat exchanger water flow rate
The nominal water flow rate given 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
Once the system is on temperature, the minimum user water temperature should not be less than 30 °C: Lower values could
cause incorrect working operation of the compressor and compressor failure may occur. The maximum user outlet water
temperature cannot exceed 78°C ; higher values may call the action of safety devices which would stop the unit.
Source water temperature
The minimum source water outlet temperature is, in heating mode, 7°C. To operate below this limit a glycol mixture must be used.
In case of use with this glycol mixture the minimum source water outlet temperature is -5°C. The maximum source water outlet
temperature is 40°C .
Units are designed and manufactured to European safety and technical standards. The units have been
designed exclusively for heating, cooling and domestic hot water production (D.H.W.). The units must be
used for this specific purpose only.
Lochinvar Limited will not be liable for claims for damage caused to persons, animals or material
goods or property caused by improper installation, adjustment and maintenance or improper use. Any
use not specified in this manual is prohibited.
In case of operations outside of these values, please contact the Lochinvar Limited.
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90
80
70
60
50
40
30
20
-15
-10
-5
0
5
Heating
Heating with HT version
10
15
20
25
30
Source outlet water temperature (°C)
35
40
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