ITT A 402 Serie Instructions D'installation Et D'entretien page 57

A_AD 16.05.2007 8:22 Uhr
57
Seite 57
english
SWITCH 1 to 5
Setting ex works:
SWITCH
1 Power limitation
ON
2 Proportional
pressure
3 Minimum speed 1
min. 1
4 Analogue input OFF
(71-72)
5 Auto Minimum speed
OFF
Comments switch settings:
A) The power limitation is set ex works to 80% of P max
to reduce noise from excessive pump output V.
The max. pump output can be changed if need be («OFF»)
B)
Proportional pressure is recommended in most systems.
Constant pressure can make sense in the following systems:
Former gravity heater with very little pressure loss.
Primary circulation pumps in system with little pressure loss.
C) Auto minimum speed
If the flow temperature in the system drops by 10 to 15 °C,
the pump output is reduced to min 1 after circa 0.5 to 2h.
If the flow temperature increases by 10 °C,
the normal operation immediately commences.
SWITCH
Power limitation
OFF
Constant
pressure
Minimum speed 2
min. 2
Analogue input ON
(71-72)
Auto Minimum speed
ON
A)
B)
C)