14
5 INSTALLER IMPORTANT POINTS
Please read all instructions before fitting this appliance
► The installer must instruct the user on the operation of the boiler, fault code diagnosis and how to reset
the boiler, location of the filling loop and how to re-pressurise the system if the water pressure drops to
below 0.5 bar.
► The installer must hand over these installation and user instructions ensuring the Benchmark
Commissioning Checklist has been completed correctly.
► The attending engineer must complete the service record on the Benchmark Checklist aer each
service and/or replacing any parts within the boiler.
► It is required under Gas Safe Regulations for the installation to be notified and to register the
installation with Gas Safe, and Building Control (Gas Safe Notification).
► You must register the boiler with Intergas heating ltd within 30 days of the installation to validate any
warranty supplied with the boiler, via post, website or MiReg if you are the installer.
► When commissioning the boiler, check the gas inlet working pressure is 20mbar (NG) or 37mbar for
(LPG) on P1 of the boiler gas valve. (Min 17mB (NG) 30mB (LPG) with all connected appliances operating
at full rate).
► Combustion analysis with a correctly calibrated and certificated electronic analyser is essential for safe
commissioning of the boiler, this must be documented within the Benchmark commissioning checklist.
► A pressure reducing valve set to 3.5 bar must be fitted if the mains water supply pressure is above 5 bar,
this should be located no closer than 3 metres proximity to the boiler for expansion purposes.
► In areas where the water hardness is 200ppm or above, appropriate protection must be taken in
accordance with BS 7593 & in line with building regulations Part L. (See Warranty Provisions on page 88,
point 15).
Intergas recommend Hydroflow HS38a wired into the boiler or HS38b which can be powered
separately.
► The end user / home owner should be advised to keep this installation manual in a safe place,
preferably near the appliance for servicing and future reference, it is a legal requirement that any
attending engineer can check the validity of the Benchmark commissioning checklist (Benchmark
certificate).
► It is important to protect the boiler during the installation. In particular, do not allow any dust or debris
to enter the flue connection at the top of the appliance.
► Before operating the boiler please ensure that the copper pipework you are installing is connected
to the appropriate tappings on the boiler. (Plastic pipework where appropriate must be a minimum
distance of 1000mm away from the boiler connections as per BS 5955-2008).
► It is important to chemically treat and thoroughly flush the heating circuits, prior to commissioning
the boiler, in order to remove any residue fluxes and debris from within them, (please isolate the
appliance). The system flush must be carried out to BS 7593:2019 and an appropriate inhibitor added
to the correct dosage, dependant on the system capacity, as indicated on the product used.
► Intergas recommend water treatment in accordance with the Benchmark Guidance on Water Treatment
in Central Heating Systems, we recommend the use of FERNOX, SENTINEL or ADEY inhibitors. It is most
important that correct concentration of water treatment is maintained for the life of the boiler, a water
sample is required upon installation and to be verified by the aforementioned manufacturers should
we attend a warranty call a water sample may be required to keep the warranty valid. (BS 7593:2019)
► As per BS 7593:2019 Intergas recommend the fitting of an approved magnetic type filter to the
heating return pipe under the boiler (Intergas Nickel plated brass system filter recommended).
► This boiler has been factory set but adjustment may be required to the heating output in order to
match the individual heating demand. This can be done by changing parameter P010 (= max. power
CH) or parameter P070 (= max. power domestic water). See §9.1.5 "To modify a parameter".
► Please do not use the pressure relief valve as a means of flushing, draining the boiler or system.
► Aer domestic hot water production a preset time delay will occur this is designed to prevent the boiler
from cycling thus enhancing the overall eiciency further.
Note: an anti-cycle delay time can be set up to a maximum of 15 minutes by adjusting parameter P036
as described in §8.3.
► When required an external expansion vessels should be inverted with the water side facing downwards
and connected to the heating return (not the flow side) this will allow correct draining of system and
help prolong the life of the vessel diaphragm. (precharge air pressure should be set as per the internal
vessel of the boiler i.e. 0.75bar +/- 0.2bar).
► If you experience any problems please refer to the installation and commissioning guidelines within the
boiler instruction manual. (If necessary, please contact Intergas Heating Ltd).
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