CIAT Ereba He Series, Instruction Manual

Page: 29 / 96

EN-29
EREBA He
2 - INSTALLATION OF UNIT
Table 2: Steps to clean, purge, and define a flow rate for hydraulic circuit
N°
With Variable Speed Hydraulic module
Adjustable constant speed
With Variable Speed Hydraulic
module ΔT
Cleaning
procedure
1 Open the manual control valve fully. No manual control valve required with Variable Speed Hydraulic module
2 Set the system pump
(1)
.
3
Read the BPHE pressure drop...
… by taking the difference of the readings of the pressure gauge connected to the unit inlet and outlet.
4 Let the pump run for two consecutive hours to flush the hydraulic circuit of the system (presence of solid contaminants).
5 Take another reading.
6 Compare this value to the initial value.
7 If the pressure drop…
… has decreased, this indicates that the screen filter must be removed and cleaned, as the hydraulic circuit contains solid particles.
8 In this case stop the pump
(1)
and close the shut-off valves at the water inlet and outlet and remove the screen filter after emptying the hydraulic
section of the unit.
9 Repeat, if necessary, to ensure that the filter is not contaminated.
Purge
procedure
1 After filling with water, wait about 24h before activating the purge procedure.
2 Activate the purge mode
(1)
: water pump is requested to run continuously at maximum speed to purge the hydraulic circuit regardless the flow
switch value
(2)
.
3 The air purge is field-supplied.
If the purge is automatic, air will vent from circuit automatically.
If the purge is manual, open the valve to vent air from the circuit
Water flow
control
procedure
1 When the circuit is cleaned and purged, activate the pump in quick test mode
(1)
, and read the
pressures at the pressure gauges (entering water pressure - leaving water pressure), …
No need to adjust the flow rate because of
ΔT control.
But it is necessary to adjust the Minimum
pump speed [P567]to ensure closure of flow
switch
(1)
.
3 Compare this value to the graph of available external static pressure using the appropriate speed
curve (Graphic 1).
4 If the flow rate corresponding is higher, decrease pump speed
(1)
, and vice versa.
5 Proceed by successively adjusting the pump speed until the expected water flow rate is achieved.
(1) For configuration details, refer to table 3.
(2) CAUTION: In purge mode, the value of the flow switch is ignored, so check that there is water in the circuit, to avoid damage to the pump.
Table 3: Actions in WUI parameter menu or Service tools to activate the cleaning
purge and control of flow rate for hydraulic circuit
Steps Table Par. Designation Description Range Default Ex. Unit
Cleaning procedure
QCK_
TEST
321 Quick Test enable Access to Quick test mode 0 to 1 0 1 -
331 Water Pump Speed Activate the pump 0 to 100 0 100 %
Wait around 2h that the hydraulic circuit is cleaned
331
Water Pump Speed Stop the pump 0 to 100 0 0 %
321 Quick Test enable Exit the Quick test mode 0 to 1 0 0 -
Purge procedure
MOD_
REQ
44 System Mode Request
8 = Purge (water pump is constantly
running to purge the hydraulic circuit)
0 to 6 and 9 = not used for this
configuration
0 to 9 - 8 -
Wait that the circuit purges
44
System Mode Request
To exit purge mode, change the value of
[P044] with the wanted mode (0 or 1 or
2 or 4)
0 to 9 - 0 / 1 /2 /4 -