Glow-worm Clearly Heat Pumps Envirosorb3 - Manual (Page 18)

0020154078_00 - 02/13 - Glow-worm 18
MAINTENANCE
5.4.2 Adjusting the hydraulic circuit fl ow rate
The heat pump is designed to operate above a minimum fl ow
rate. If the heat pump functions at a minimum fl ow rate, this
will result in a loss of power and performance. The heating
comfort will still be guaranteed but the energy savings will be
reduced.
Envirosorb3 8 Envirosorb3 11
Minimum fl ow 380 l/h 540 l/h
Recommended fl ow 1400 l/h 1900 l/h
It is possible to read the fl ow rate directly on the controller.
Depending on the type of fl uid used in the hydraulic circuit,
the fl ow rate displayed on the control box may be over-
estimated.
Example: If you use a 30% propylene glycol mixture and the
fl uid temperature is 5°C, you must subtract 400l/h from the
value displayed on the control box.
∙ Refer to the table below for the various values of over-
estimation of the fl ow rate depending on the fl uid type and
temperature.
Flow rate over-estimation (l/h)
Fluid temperature
5°C 15°C 25°C
Fluid type
Water 0 0 0
Propylene glycol 30% 400 240 120
Propylene glycol 50% 650 500 400
i Incorrect venting of the installation may lead to
flow variations.
∙ If you cannot reach the minimum fl ow rate, install an
auxiliary pump.
∙ Refer to the system documentation for the information
necessary for installing the auxiliary pump.
∙ If you cannot achieve the recommended fl ow rate, adjust
the circuit pressure on the control box and, if necessary,
use the fl ow rate adjusting tap on the hydraulic module.
5.4.2.1 Available pressure in hydraulic circuit of the
heat pump
A
B 0
10
20
30
40
50
60
70
80
500 0 1000 1500 2000
1
2
Key
1 Envirosorb3 8 (with the water circuit at 20 ° C)
2 Envirosorb3 11 (with the water circuit at 20 ° C
A Available pressure (kPa)
B circuit fl ow rate (l/h)
5.5 Installation of side panel
C
C
B
A
5.6 User information
After completing the installation:
∙ Explain to the user the system operation.
∙ Draw special attention to the safety instructions that the
user must follow.
∙ Inform the user of the necessity to ensure that the system
is regularly maintained (maintenance contract).
∙ Explain to the user how to check the water level/fi lling
pressure of the system.
∙ Answer any questions the user may have.
6 Maintenance
a Danger!
Risk of injury due to unintended intervention on
the refrigerant circuit!
The device contains refrigerant fluid and must be
handled with care. Any work carried out on the
refrigerant circuit must be conducted by qualified
engineers.
•
Only work on the refrigerant and cooling circuit
if you are a trained and approved specialist
equipped with appropriate protective equip-
ment.
•
Perform draining and filling operations in a
properly ventilated area.
•
Avoid any contact with the skin or eyes.