Gulfstream GS A-Class 12/OV, Design, Installation & Servicing Instructions

Supplied By www.heating spares.co  Tel. 0161 620 6677

Page 24

5.3 CLEANSING AND WATER TREATMENT

5.3.1   Water Treatment

WARNING: We only recommend ‘Fernox Superfloc’ cleaning agent and Fernox MB1 

protector for this appliance. The correct use of cleaning agent and the correct 
strength of inhibitor is essential for the efficient and long life of this appliance. 
Failure to do this correctly will result in premature corrosion of the boiler/blocking 
of the waterways and neither of these situations will be covered by the appliance 
warranty.

The correct quantities of cleaning and treatment agents should be determined from 

the manufacturer’s instructions and the 100 litre water content of the store must 
be included. General guidelines for quantities of cleansing and treatment agents 
are shown in table 5.1. 

(a)  Ensure that all cleansing/treatment of the heating system is carried out fully in 

accordance with the instructions provided by Fernox.

(b) The water system must be thoroughly flushed out, initially with cold water and 

ensuring that all valves are fully open.

(c)  Refill the system to normal working pressure. Examine for water leaks. Rectify if 

necessary.

(d) Add  Fernox  Superfloc  Cleansing  Agent  to  ensure  that  all  flux  residues  and 

installation debris are removed from the system.

(e)  Heat the system to full operating temperature, check for water leaks and rectify 

if necessary.  Flush the system again until it is clean.

(f)  Refill the system and add Fernox MB1 Protector to the system ensuring that the 

system is fully vented.

Table 5.1 Quantities of cleansing and treatment agents (litres)

Heating circuit design 

heat loss (kW)

Fernox

Superfloc

Fernox

MB1

6

5.0

1.2 - 2.4

12

5.9

1.5 - 3.0

18

6.9

1.7 - 2.4

24

7.8

2.0 - 4.0

30

8.8

2.2 - 4.4

5.3.2      Power  Flushing/Cleaning  of  the 

Heating System

(a)  When carrying out the work, always comply 

fully with the manufacturers’ instructions for 
the power flushing equipment.   

(b) We  would  always  recommend  that  the 

GulfStream

A-ClASS

 appliance is isolated from 

the heating system being cleaned.

(c)  If in any doubt, please consult our Technical 

Help line.

5.4   FLUE SYSTEM
(a)  The flue system should have been designed 

and  installed  in  accordance  with  the 
requirements  under ‘Flue  System  Design, 
section 3.4’ in this manual.

(b) Check that sealing of terminal(s) and pipes 

is sound and acceptable.

(c)  Check that horizontal lengths of flue pipe fall 

back to the boiler and that there are no low 
points where the condensate could collect.

COMMISSIONING