Immergas HERCULES SOLAR 26 2 ErP, Instruction And Recommendation Booklet

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10 Switch the solar pump on at a maximum 

speed and make it run for at least 15 minutes.

11 Disconnect the filling pump and close the 

fittings using the relevant screw caps.

12 Open the ball valve above the pump com-

pletely.

Do not fill the system in conditions with strong 

insolation and with the manifolds at high 

temperatures.

Make sure that all air bubbles have been com-

pletely eliminated.
Solar circuit vent.

Any air present in the system must be bled:

- on start-up (after filling);
- if necessary, e.g. in the case of breakdown.

Attention:

 danger of burns from the liquid 

contained in the collectors.

1.25 BOILER START UP (IGNITION).

In order to issue the Declaration of Conformity 

required by the laws in force, one must fulfil 

the following requirements to commission the 

boiler (the operations listed below must only 

be performed by qualified personnel and in the 

presence of professionals only):

-  check that the internal system is properly sealed 

according to the specifications set forth by 

technical regulations in force;

-   make sure that the type of gas used corresponds 

to boiler settings;

- Check that there are external factors that may 

cause the formation of fuel pockets; 

-   switch the boiler on and check correct ignition;
- make sure that the gas flow rate and relevant 

pressure values comply with those given in the 

manual (Par. 3.17);

- ensure that the safety device intervenes in the 

event of gas supply failure and check the relative 

intervention time;

- check the intervention of the main switch 

located upstream from the boiler and in the 

boiler;

- check that the intake/exhaust concentric ter-

minal (if fitted) is not blocked.

The boiler must not be started up even if only 

one of the checks should be negative.

N.B.:

 only upon completing commissioning by 

an installer, may an authorised firm carry out an 

initial inspection of the boiler, which is required to 

activate the Immergas warranty. The test certificate 

and warranty is issued to the user.

1.26 DHW MIXING VALVE.

The thermostatic mixing valve mixes the cold 

water with the hot water and via an internal wax 

element, sensitive to the temperature, automati-

cally controls the temperature of the mixed water 

set by the user.

N.B.:

 for excellent management of the tempera-

tures, the mixing valve must be set by the installer 

at a safety temperature required by the user. The 

outlet temperature of the domestic hot water 

can also depend on the value set on the boiler, 

however

,

 the upper limit temperature value of 

the domestic hot water is always determined by 

the position of the mixing valve: knob position 1 

= 42°C, 2 = 48°C, 3 = 54°C, 4 = 60°C (standard) 

(the values indicated refer to a storage tank with 

water at 70°C).

Any release of the three-way mixing valve.

 If 

after a long period of inactivity the three-way 

mixing valve is blocked, it is necessary to act 

manually on the knob positioned on the top of 

the same in a way to release the shutter of the 

valve itself.

1.27 CIRCULATION PUMP.

Boilers in the “Hercules Condensing ErP” series 

are supplied with 2 types of circulating pumps. 

Set operation modes according to one's installa-

tion requirements.
• 

Boiler circulator pump. 

The circulating pump 

is not equipped with speed selector. To change 

operation mode, parameter “Pump sp.” in the 

“Configurations” boiler menu must be changed.

  Pump release.

  If the pump should be blocked 

after a long period of inactivity, it must be re-

leased. Loosen the front cap, making sure that 

the liquid that escapes cannot cause injury/

damage to persons/objects and turn the mo-

tor shaft very carefully using a screwdriver so 

as not to damage the latter. Once the pump is 

released, close the vent cap.

• 

Zone 1 circulator pump. 

The pump is ideal for 

the requirements of each central heating system 

in a domestic and residential environment. 

In fact, the pump is equipped with electronic 

control that allows to set advanced functions.

Adjustments.

 Turn the selector and set it on 

the desired curve to adjust the circulator pump.

Program

LED

P 1 lower (ΔP-V)

P 2 upper (ΔP-V)

green

C 3 lower (ΔP-C) - H=3 m

C 4 upper (ΔP-C) - H=4 m

orange

Min - Max

blue

Program P (1 lower 2 upper) (ΔP-V) - Pro-

portional curve

(green LED).

 This allows 

the pressure level (head) to be proportionally 

reduced as the system heat demand decreases 

(flow rate reduction). Thanks to this func-

tion, the electric power consumption of the 

circulator pump is reduced further: the energy 

(power) used by the pump decreases according 

to the pressure level and flow rate. With this 

setting, the pump guarantees optimal perfor-

mance in most heating systems, thereby being 

particularly suitable in single-pipe and two-

pipe installations. 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.

Programs C (3 lower 4 upper) (ΔP-C) - Con-

stant curve (orange LED).

 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.

MIN-MAX Program (Blue LED).

 The pump 

is distinguished by adjustable operating curves 

by positioning the selector in any point between 

the Min and Max positions, thereby satisfying 

any installation requirement (from a simple 

single-pipe to more modern and sophisticated 

systems) and always guarantee optimum per-

formance. The precise working point can be 

selected in the entire field of use by gradually 

adjusting the speed.

Real time diagnostics:

 a lit LED (in various 

colours) provides information regarding the 

pump operating status, see fig. 1-25

Possible pump release.

 The pump block is 

indicated by a fixed red LED switching on. Turn 

the selector up to the MAX position, discon-

nect and reconnect the power to restart the 

automatic release process. The pump will then 

activate the procedure that will last a maximum 

of 15 minutes and the LED will flash upon each 

restart. It then turns blue for a few seconds and 

goes back to red if the attempt to restart is not 

successful. Once the process is complete, set 

the selector back to the desired curve and if 

the problem has not bee resolved, perform the 

manual release procedure as described below.

  -  Disconnect the power to the boiler (the LED 

switches off). 

  - Close the system flow and return and let the 

pump cool down.

  -  Empty the system circuit via the relative cock.
  - Remove the motor and clean the impeller. 
  - Once unblocked, remount the motor.
  -  Fill the primary circuit; restore boiler power 

and set the desired curve.

 Attention:

  there is a burns hazard due to high 

fluid temperature and pressure. 

Burns hazard 

from coming in contact.