Nortek Reznor 120, Installation & Servicing Manual

Page: 7 / 68

The location must also allow for adequate clearance for the
air supply, return air circulation, oil supply and electrical
supply, whilst also providing good and safe working access.
The heater must be installed on a fl at and level surface made
from non-combustible material, which is suffi
ciently robust
to withstand the weight of the heater and any ancillary
equipment. Any combustible material adjacent to the heater
or fl ue system must be so placed or shielded so that its surface
temperature does not exceed 65°C.
In areas where it is proposed that more than one heater is to
be installed, a general scheme of circulation should be drawn
up and maintained, thereby off ering the best heat distribution
All Oil Fired Cabinet Heaters are fi tted with a pressure relief
facility, this is incorporated into the design of the fl ue gas exit
duct.
Care should therefore be taken in siting service connections
and controls well away from the pressure relief vent.
Warning
Under no circumstances must the pressure relief be
restricted, blocked, or have the free exit of exhaust gas
impaired or re-directed.
1.9 Fuel supply - general
The Oil Fired Cabinet Heater range are all manufactured and
pre-set for use with 35 second gas oil delivered to the burner
via a suitable piped system from the oil storage tank.
Galvanised or plastic pipe work and fi ttings must
not be used. (see BS 5410 Part 1 1997)
The constraints of the application will, to a large extent,
determine whether it is preferable to use a single pipe gravity
feed system, or whether the two pipe pumped system is more
appropriate.
Where more than one appliance is to share a common supply
it will be necessary to use a pressurised ring main system.
All pipe work must be constructed and installed so that it does
not permit the ingress of air.
The construction, size, and position of the oil storage tank
must take account of the current regulations, as well as suiting
the requirements of the installation.
Please refer to pages 9 and 10 for additional information.
Caution
On pumped systems always check that the pump is correctly
set up prior to running, and always ensure that valves are
open allowing a free fl ow of oil through the system.
1.9.1 Fuel
In order to promote trouble free operating it is necessary that
the oil within the storage tank and oil line does not fall below
the cold fi lter plugging point (cfpp), in this country and with
class D fuel (also referred to as gas oil). The critical
temperature is -4°C for this summer grade.
The cfpp critical temperature for the winter grade is -12°C.
If summer grade fuel is stored for winter use in areas prone
to severe frosts and low temperatures it will be necessary to
insulate or even heat the supply tank and pipe work.
Note
The fuel supplier should be contacted prior to installation so
that any requirements concerning delivery, transport, storage
and use can be addressed before work commences.
The inlet pump pressure must not exceed a maximum of 0.4
bar, this is because beyond this point gas is liberated from the
oil.
1.9.2 Storage tank
An externally painted steel storage tank to BS 799 part 5 1987
or a medium density polyethylene oil tank OFTEC certifi ed
to OFS T-100 may be used. Local, national, European and fi re
regulations must also be complied with and must include:
• A fuel level gauge (not made from glass) a vent pipe
with a diameter greater than that of the fi ller and
featuring a weatherproof termination.
• A sludge valve.
• An outlet valve situated at the opposite end of the
tank to the sludge valve.
• A fi ller pipe connection situated at the opposite end
to the outlet valve.
The size of the storage tank must take account of the
estimated consumption and any quantity price breaks off ered
by the oil supplier.
It is preferable to install the tank outside, however, if this
is not practicable and the tank has to be installed indoors
advice must be sought about its siting, especially so far as fi re
regulations are concerned.
If a separate fi re resistant chamber cannot be provided for
indoor installations, a catchment pit with a capacity 10%
greater than that of the storage tank must be provided
Storage tanks can if necessary be sited on a roof, but this is
subject to special regulations as well as local authority
approval and compliance with fi re regulations, reference to
BS 5410 part 2 1978 & part 1 1997 is strongly suggested.