Immergas 3.025499, Instruction And Recomendation Booklet

20

1-26A

1-26B

INS

TALLER

US

ER

MAINTEN

AN

CE TECHNI

CI

AN

LED

Description

Diagnostics

Cause

Remedy

Green (on)

Normal functioning

Green 

(fast flashing)

Automatic vent in operation The circulator pump vents 

for 10 minutes

Air in circulator pump

If the circulator pump requires the au-

tomatic vent function often, one must 

adjust the operating mode properly.

Red (on)

Green (flashing)

Abnormal situation

Circulator pump working 

but stationary

The circulator pump restarts 

once the abnormal situation 

has been solved

a)  voltage out of range 

(160 ÷ 253V)

b)  circulator pump tem-

perature high

a)  check power supply
b)  check temperature of room and of 

the water contained in the system

Red (flashing)

Circulator pump blocked

the circulator pump cannot 

restart automatically due to 

an anomaly

check the circulator pump if the problem persists replace the 

circulator pump

LED (off)

circulator pump not work-

ing

electronics not powered

a)  circulator pump not 

connected

b)  LED damaged
c)  electronics damaged

a)  check the electrical connections
b)  check that the circulator pump is 

working

c)  replace the circulator pump

Key:

  1  -  Automatic vent mode operation

  2  -  Light ring to indicate the operat-

ing status

  3  -  Proportional head operation

  4  -  Constant head operation

  5  -  Operating mode selector switch

  6  -  Fixed speed operation

1.30 CIRCULATION PUMP.

The boilers are supplied with various circulator 

pumps, all equipped with a speed regulator.

These settings are suitable for most systems.

NOTE.:

 the ∆T can be controlled compatibly 

with the characteristics of the central heating 

system and of the boiler.
• 

Boiler circulator pump. 

The boilers are sup-

plied with a variable speed circulator pump. 

When the boiler operates in heating mode, the 

pump speed is defined according to the “P57” 

parameter setting in the M5 menu (Par. 3.9), in 

domestic hot water mode the circulator pump 

always runs at maximum speed.

During the heating stage the Auto and Fixed 

operating modes are available.
- 

Auto:

 automatic circulator speed. In this mode 

one can choose between the “Proportional 

head” and “Constant ∆T” option.

 - 

Proportional head (

∆

T = 0):

 the circulator 

speed varies according to the power emit-

ted by the burner, the greater the power the 

greater the speed. Within the parameter one 

can also adjust the pump operating range, 

by setting the maximum speed (adjustable 

from 100 % 

÷

 30 %) and the minimum speed 

(adjustable from 30% to the max. set speed).

 - 

∆T Constant (∆T = 5 ÷ 25 K):

 the pump 

speed varies to maintain the ∆T constant 

between the system flow and return accord-

ing to set value K. Within the parameter one 

can also adjust the pump operating range, 

by setting the maximum speed (adjustable 

from 100 % 

÷

 30 %) and the minimum speed 

(adjustable from 30% to the max. set speed).

- 

Fixed (100 % ÷ 30 %):

 in this mode the pump 

operates at constant speed, the operating range 

is defined between minimum (30 %) and maxi-

mum (100 %).

Pump release.

 If, after a prolonged period of 

inactivity, the circulation pump is blocked, 

unscrew the front cap and turn the motor shaft 

using a screwdriver. Take great care during this 

operation to avoid damage to the motor.

• 

Heating / cooling and solar circuit system 

circulators.

 The circulators are equipped with 

electronic control that allows to set advanced 

functions.. For proper operation one must 

select the most suitable type of operation for 

the system and select a speed in the available 

range.

  -  The heating / cooling system circulators (Fig. 

1-26A) control the room heating or cooling 

requests downstream of the hydraulic mani-

fold.

 - The solar circulator (Fig. 1-26B) manages the 

requests of the solar system. 

  - Constant head (ΔP C) (4 fig. 1-26A).

 The 

circulator pump maintains the pressure level 

(head) constant as the system heat demand 

decreases (flow rate reduction). With these 

settings, the circulator pump is suitable for 

all floor systems where all the circuits must 

be balanced for the same drop in head. One 

can select the power level from a minimum 

one to a maximum one by turning the selector 

switch clockwise in the relative power scale.

  -  Proportional head (ΔP V) (3 fig. 1-26A-B).

This allows the pressure level (head) to be 

proportionally reduced as the system heat 

demand decreases (flow rate reduction). 

Thanks to this function, the electric power 

consumption of the circulator pump is re-

duced further: the energy (power) used by 

the pump decreases according to the pressure 

level and flow rate. With this setting, the 

pump guarantees optimal performance in 

most heating systems, proving particularly 

suitable in single-pipe and two-pipe installa-

tions. Any noise of the water flow in the pipes, 

valves and radiators is eliminated by reducing 

the head. Optimal conditions for thermal 

comfort and acoustic well-being. One can se-

lect the power level from a minimum one to a 

maximum one by turning the selector switch 

counterclockwise on the relative power scale.

-  Fixed (6 Fig. 1-26B).

 In this mode the pump 

operates at constant speed, the operating 

range is defined between minimum (I) and 

maximum (III).

 Adjustments.

 Turn the selector and set it on 

the desired curve to adjust the circulator pump.

Automatic vent function (1 fig. 1-26A).

 The 

circulator pump is equipped with a function 

that activates its operation for 10 minutes, 

alternating the speed between minimum and 

maximum, so that the air contained in the cir-

culator pump is expelled by the air vent valve.

  Diagnostics in real time:

 a light ring (2 fig. 

1-26A-B) supplies, with different colours, 

information relating to the circulator pump 

operating status, see table below.

Min