Important Information - Bosch Pilot Ignition TF250 Series Installation Manual And Operating Instructions

All gas appliances require adequate air
intake to ensure correct combustion. Insects
and dirt ingress may affect combustion
causing sooting. If you notice sooting from
the flue outlet the unit would require
servicing.
Pest and dirt ingress is not covered by the
manufacturers warranty.
4.1

Important information

▶ Determine most suitable location for the appliance. Install
only on an external wall as close as possible to the most
frequently used hot water outlet. If the unit is to be installed
on a combustible surface, use a heat shield. Allow a
minimum air gap of 10mm between the flue and the heat
shield.
▶ Unit must be commissioned upon installation.
▶ Ensure the mounting structure is capable of supporting the
weight of the appliance once installed. Secure the
appliance to the wall using fixings suitable for the weight of
the appliance and the wall material.
▶ Do not place articles on or against this appliance.
▶ Install gas and water isolation valves as close as possible to
the heater. Only use gate valve or full flow ball valve (fixed
mechanism type) for cold water.
▶ Check the cold water supply pressure to ensure it meets
the required supply pressure for the appliance.
(table 5).
▶ If the inlet water pressure exceeds 800 kPa, a pressure
limiting valve (500 kPa) MUST be fitted. The preferable
location for the pressure limiting valve is at the water
meter.
▶ Where the pressure limiting valve is less than 3 metres from
the hot water unit, it must be fitted in conjunction with a
cold water expansion valve (700 kPa), between the water
heater and the pressure limiting valve.
▶ Failure to comply with this requirement may void the
warranty.
▶ Refer to AS/NZS5601 for the relevant gas pipe sizing.
▶ After finishing the gas piping system, the pipes must be
thoroughly purged and leak tested. This test must be
performed with the gas isolation valve of the appliance
closed.
▶ Ensure the gas pressure and flow through the regulator are
appropriate for the consumption of the heater (table 5).
Refer to AS/NZS5601 and AS3500.1 for the relevant pipe
size.
Pilot Ignition – 6 720 886 398 (2021/02)
▶ As the water temperature at the outlet may exceed 50 °C, a
temperature limiting device (such as a tempering valve)
must be fitted to pipework feeding sanitary fixtures used
for the purpose of personal hygiene as per AS3498.
Note: Incorrect pipe sizing or gas supply pressure may cause
the appliance to underperform. Service calls for incorrect pipe
sizing and/or gas pressure, will NOT be covered under
warranty.
Installation
9